As filed with the Securities and Exchange Commission on June 17, 2003
                                                   Registration   No. _______
===============================================================================
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549
                                _______________

                                   FORM S-3
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933
                                _______________

                                   KFX INC.
            (Exact Name of Registrant as Specified in Its Charter)

               Delaware                                    84-1079971
     (State or other jurisdiction of                    (I.R.S. Employer
     incorporation or organization)                    Identification No.)

                                                      Theodore Venners
3300 East First Avenue, Suite 290             3300 East First Avenue, Suite 290
     Denver, Colorado 80206                        Denver, Colorado 80206
         (303) 293-2992                                (303) 293-2992
(Address, including zip code, and           (Name, address, including zip code,
  telephone number, including area code,     and telephone number, including
  of registrant's principal executive        area code, of agent for service)
           offices)

                                   copy to:

                            Phyllis G. Korff, Esq.
                   Skadden, Arps, Slate, Meagher & Flom LLP
                               Four Times Square
                         New York, New York 10036-6522
                                (212) 735-3000

            APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
As soon as practicable after the effective date of this Registration
Statement.

            If the only securities being registered on this Form are being
offered pursuant to dividend or interest reinvestment plans, please check the
following box. [_]

            If any of the securities being registered on this form are to be
offered on a delayed or continuous basis pursuant to Rule 415 under the
Securities Act of 1933, other than securities offered only in connection with
dividend or interest reinvestment plans, check the following box. [X]

            If this Form is filed to register additional securities for an
offering pursuant to Rule 462(b) under the Securities Act, please check the
following box and list the Securities Act registration statement number of the
earlier effective registration statement for the same offering. [_]

            If this Form is a post-effective amendment filed pursuant to Rule
462(c) under the Securities Act, check the following box and list the
Securities Act registration statement number of the earlier effective
registration statement for the same offering. [_] If delivery of the
prospectus is expected to be made pursuant to Rule 434, please check the
following box. [_]

                               _______________



                        CALCULATION OF REGISTRATION FEE

                                                     Proposed         Proposed
                                                      Maximum          Maximum
  Title of Each Class of          Amount to be    Offering Price      Aggregate          Amount of
Securities to be Registered      Registered(1)      per Unit(2)     Offering Price    Registration Fee
---------------------------      -------------    --------------    --------------    ----------------
                                                                          
Common Stock, $0.001 par
 value per share                   1,969,553          $4.32           $8,508,469          $688.34



(1)      Pursuant to Rule 416 under the Securities Act, this registration
         statement also covers such additional shares as may hereafter be
         offered or issued to prevent dilution resulting from stock splits,
         stock dividends, recapitalizations or certain other capital
         adjustments.

(2)      Estimated solely for the purpose of computing the amount of the
         registration fee pursuant to Rule 457(c) under the Securities Act of
         1933, as amended, based on the average ($4.32) of the high and low
         prices ($4.39 and $4.25, respectively) for a share of common stock as
         reported on the American Stock Exchange on June 12, 2003.

The Registrant hereby amends this Registration Statement on such date or dates
as may be necessary to delay its effective date until the Registrant shall
file a further amendment which specifically states that this Registration
Statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933 or until the Registration Statement shall become
effective on such date as the Commission, acting pursuant to said Section
8(a), may determine.






                  SUBJECT TO COMPLETION, DATED JUNE 17, 2003

PROSPECTUS

                                   KFx Inc.

                       1,969,553 Shares of Common Stock


         This prospectus relates to 1,969,553 shares of common stock, $.001
par value per share, of KFx Inc., a Delaware corporation, which may be offered
from time to time by the selling stockholders named herein. The shares include
up to 1,921,553 shares of common stock issuable upon the exercise of warrants
and 48,000 shares of common stock. We have agreed with the selling
stockholders that we will pay all expenses incident to the registration of the
common stock under the Securities Act of 1933, as amended.

         The selling stockholders may sell the shares of common stock
described in this prospectus in a number of different ways and at varying
prices. For additional information on the methods of sale, you should refer to
the section entitled "Plan of Distribution" beginning on page 13.

         The common stock is listed for trading on the American Stock Exchange
under the symbol "KFX." On June 16, 2003, the last reported sale price of the
common stock was $4.17 per share.

         Our corporate offices are located at 3300 East First Avenue, Suite
290, Denver, Colorado 80206. Our telephone number is (303) 293-2992.

                                _______________

         Investing in our common stock involves substantial risks. See the
section entitled "Risk Factors" beginning on page 3.

         Neither the Securities and Exchange Commission nor any state
securities commission has approved or disapproved of these securities or
passed upon the adequacy or accuracy of this prospectus. Any representation to
the contrary is a criminal offense.


                                _______________



                 The date of this prospectus is June 17, 2003



                               TABLE OF CONTENTS


                                                                    Page Number
Section Title
Forward-Looking Statements.....................................           2
Risk Factors...................................................           3
KFx Inc........................................................          10
Use of Proceeds................................................          11
Selling Stockholders...........................................          11
Plan of Distribution...........................................          14
Legal Matters..................................................          14
Experts........................................................          14
Incorporation of Documents by Reference........................          15
Where You Can Find More Information............................          15

                                _______________

References in this prospectus to "KFx," "we," "us" or "our" refer to KFx Inc.


         You should rely only on the information incorporated by reference or
provided in this prospectus and its supplement(s). We have not authorized
anyone to provide you with different information. You should not assume that
the information in this prospectus or any supplement is accurate as of any
date other than the date on the front of those documents. This prospectus does
not constitute an offer to sell or a solicitation of an offer to buy the
securities in any jurisdiction to any person to whom it is unlawful to make
such offer or solicitation in such jurisdiction.


                          FORWARD-LOOKING STATEMENTS

         Some of the information presented in this prospectus constitutes
"forward-looking statements" within the meaning of the Private Securities
Litigation Reform Act of 1995. These forward-looking statements include, but
are not limited to, statements that include terms such as "may," "will,"
"intend," "anticipate," "estimate," "expect," "continue," "believe," "plan,"
or the like, as well as all statements that are not historical facts.
Forward-looking statements are inherently subject to risks and uncertainties
that could cause actual results to differ materially from current
expectations. Although we believe our expectations are based on reasonable
assumptions within the bounds of our knowledge of our business and operations,
there can be no assurance that actual results will not differ materially from
expectations. Additional information about issues that could lead to material
changes in performance is contained in our Annual Report on Form 10-K for the
year ended December 31, 2002 and our Quarterly Report on Form 10-Q for the
quarter ended March 31, 2003, which are incorporated by reference in this
prospectus.


                                 RISK FACTORS

We have a history of losses, deficits, working capital deficits and negative
operating cash flows.

         At March 31, 2003, we had an accumulated deficit of approximately
$111,906,000. At December 31, 2002, we had a working capital deficit of
$2,554,728 and an accumulated deficit of approximately $109,719,000. At
December 31, 2002, after giving effect to the termination of a put option
previously granted to some of our stockholders, we had a stockholders' equity
of approximately $1,735,000. We incurred net losses of approximately
$39,987,000, $15,177,000 and $12,290,000 in 2002, 2001 and 2000, respectively,
and of approximately $23,850,000, net of accretion of redeemable common stock,
at December 31, 2002. We have experienced negative operating cash flow of
approximately $3,994,000, $6,738,000 and $5,151,000 in 2002, 2001 and 2000,
respectively. Further, the report from our former independent accountants for
the years ended December 31, 2001 and 2000 contained an explanatory paragraph
regarding our ability to continue as a going concern. We and our predecessors
have not achieved significant K-Fuel(R) licensing, royalty or product sale
revenue.

         We expect to incur significant additional operating losses and
continued negative cash flows from operations for the foreseeable future. We
have made, and will continue to make, very significant expenditures well
before our revenues increase sufficiently to cover these additional costs. We
are not able to estimate when, if ever, our revenue will increase sufficiently
to cover these costs. Further, we may not achieve or maintain profitability or
generate cash from operations in future periods.

         As a result, we have been and continue to be very dependent on
strategic relationships, sales of our debt and equity securities and
short-term loans from our directors and third parties to fund the operating
costs associated with our business. Our continuation is dependent on our
ability to generate sufficient cash flows to meet our obligations on a timely
basis, to comply with the terms of our financing agreements, to obtain
financing or refinancing as may be required, to attain profitability, or a
combination thereof. A lack of adequate financing may adversely affect our
ability to make necessary interest and principal payments on our indebtedness,
respond to changing business and economic conditions and competitive
pressures, absorb negative operating results, and fund capital expenditures or
increased working capital requirements.

We have contractual limitations on our ability to secure additional funding.

         Our ability to secure additional financing is limited by the terms of
a common stock and warrant purchase agreement for the sale of 6.76 million
shares of common stock in 2002. Under the terms of this agreement and a
related investors rights agreement we are prohibited from selling and issuing
any of our preferred stock until the investors no longer hold any shares of
common stock or warrants, or obtain a waiver to sell and issue preferred stock
from at least two-thirds of the these investors. The terms of this agreement
have subsequent dilutive offering protections that are triggered if we sell
common stock at a price below $2.50 per share. The investors under this common
stock and warrant purchase agreement also have the first right of purchase
related to potential sales of our common stock until August 21, 2004.

Technical and operational problems may adversely impact our ability to develop
K-Fuel(R) projects or facilities.

         There have been past significant technical and operational problems
with the construction of the K-Fuel(R) facility. The construction of the first
commercial-scale K-Fuel(R) production facility (the " KFP" Facility") began in
1995, which was completed and began operations in April 1998. The facility
experienced a series of construction problems during and after it began
operations, including a 1996 fire at the facility and issues relating to the
flow of materials within the facility and the design and operation of pressure
release equipment. Following the commencement of operations, the KFP Facility
experienced problems relating to tar and residue build-up within the system
during production and product quality issues related to product dusting. As a
result of these problems, operations at the KFP Facility were suspended. In
2000, we tested an improved K-Fuel(R) production process using Powder River
Basin ("PRB") coals, which resulted in an improved K-Fuel(R) product which is
low in sulfur dioxide, nitrogen oxide, mercury and chlorine. Analysis of this
improved K-Fuel(R) product indicated that this improved K-Fuel(R) production
process can be more reliable than the process used by the KFP Facility.
Additionally, the improved K-Fuel(R) production facilities would require less
capital and have lower operating costs than previous K-Fuel(R) plant designs.
However, there can be no assurance that any future K-Fuel(R) production
facilities will not experience technical or operational problems similar to or
in addition to those experienced at the KFP Facility. To the extent that other
technical or operational problems materialize, our ability to develop other
K-Fuel(R) projects or facilities would be jeopardized.

The K-Fuel(R) Technology has not yet shown economic viability.

         We have only recently finished the development of the K-Fuel(R)
Technology, and we will need to raise additional capital to build the first
commercial K-Fuel(R) production facility. Our future success depends upon our
ability to successfully construct and operate commercial K-Fuel(R) production
facilities.

         The process of developing, financing and constructing K-Fuel(R)
production facilities, including obtaining necessary regulatory permits and
approvals, is complex, lengthy and costly and subject to numerous risks,
uncertainties and factors beyond our control, including cost overruns, delays,
damage and technical delays. In addition, local opposition to a particular
project can substantially increase the cost and time associated with
developing the project, and can, potentially, render a project unfeasible or
uneconomical. Future projects for the development of K-Fuel(R) production
facilities may incur substantial costs or delays or may be unsuccessful as a
result of such opposition.

         Only a small percentage of the projects that are considered and
pursued may ultimately result in operating projects that are sufficiently
successful to provide us with license fee income, royalty fee income and
equity participation income. As a result, we may not be able to recover any
expenses that we incur in the evaluation and development of certain projects.

The market for the K-Fuel(R) Technology is unclear.

         Although we believe that a substantial market will develop both
domestically and internationally for clean coal fuel products, no established
market for beneficiated fuel products exists. As a result, the availability of
accurate and reliable pricing information and transportation alternatives is
not fully known. The future success of our K-Fuel(R) Technology will depend on
our ability to establish a market for clean coal fuel products among potential
customers such as electrical utility companies and industrial coal users.
Further, potential users of our fuel products may be able to choose among
alternative fuel supplies. The market viability for the K-Fuel(R) Technology
will not be known until we complete construction of one or more
commercial-scale production facilities, either in the United States or
internationally, that produce, on a consistent basis, commercial quantities of
fuel that meet certain minimum performance specifications. There is a risk
that commercial-scale production facilities when completed will be unable to
generate sufficient market interest to continue in business. Further, there
can be no assurance that a commercial-scale K-Fuel(R) facility will be
economically successful. If we are unable to complete construction and
successfully operate a commercial K-Fuel(R) production facility, we will not
be able to sustain our operations or achieve future growth.

There are risks related to sale of Pegasus or transfer of assets.

         On March 14, 2003 we and Kennecott Energy Company (together with its
affiliates, "Kennecott") signed a non-binding letter of intent with respect to
a potential transaction pursuant to which Kennecott will transfer to us all of
Kennecott's membership interest in K-Fuel, LLC and the full ownership of
certain related technology developed by Kennecott, in consideration for which
we will transfer to Kennecott preferred and common stock in Pegasus, having
the equivalent of $8 million in value, at a value per share to be agreed by us
and Kennecott, provided that such equivalent value shall result in the
acquisition by Kennecott of a majority interest in and control of Pegasus.

         In the absence of unanticipated delay, such a transaction could be
completed in the third quarter of 2003. If such transaction were to
consummate, our business will change significantly, and we will be dependent
to a large extent on the K-Fuel(R) Technology, which has not yet proved to be
commercially viable. As a result of the reduction of our interest in Pegasus,
our revenues may significantly decline. These changes may have a material
adverse effect on us.

The market for NeuSIGHT(R) and related software is new and uncertain and will
depend upon successful sales and marketing strategies and product improvement
strategies.

         Pegasus, which sells our NeuSIGHT(R) products, had revenues of
approximately $5.2 million in 2002 and $3.0 million in 2001. These revenues
are for the sale of licenses for NeuSIGHT(R) and Power Perfecter(TM),
installation services, maintenance and other revenue. The market for Pegasus
products is new and uncertain. Combustion and other optimization software such
as NeuSIGHT(R), Power Perfecter(TM), and other similar products have only been
used by the electric power business for a few years. We believe that market
pressures caused by the developing deregulation of the electric power industry
and the Clean Air Act will accelerate demand for, and market acceptance of,
combustion optimization products.

         We believe that increased market acceptance of Pegasus software is
dependent, in part, on our ability to simplify and streamline its installation
process. Product improvements directed at this objective have been made and
new versions of NeuSIGHT(R) were released to the market in late 1999, late
2000 and in early 2002. There can be no assurance that our efforts to further
improve Pegasus software products to more fully meet our objectives will be
successful. If the market for Pegasus' NeuSIGHT(R) software products fails to
develop or if we are unable to successfully market or improve our products,
our results of operation and financial condition will be materially adversely
affected.

Pegasus' operating results depend on a limited number of customers, and the
loss of customers or Pegasus' inability to attract new customers would
seriously harm our operating results.

         Pegasus has in the past derived, and may in the future derive, a
significant portion of its net revenues from a limited number of customers.
During the year ended December 31, 2002, Pegasus' top two customers were
Cinergy Corporation and TXU Generation Company LP, accounting for
approximately 32% and 26% of Pegasus' revenues, respectively, or approximately
58% in the aggregate. We expect that these two customers will continue to
account for a substantial portion of Pegasus' revenue for the duration of
their contracts, which are expected to continue through July 2004. Pegasus
will need to establish business relationships with new customers to replace
existing customers as contracts with existing customers are completed,
expired, terminated or otherwise discharged. We cannot guarantee that Pegasus
will be able to increase its customer base. If Pegasus were to lose Cinergy
Corporation or TXU Generation Company LP as customers, if either of these
customers were to significantly reduce their volume of business with Pegasus,
or if Pegasus is unable to increase its customer base, our business, results
of operations and financial condition would be materially adversely affected.

Deregulation in the United States power industry may result in increased
competition for our products.

         We expect that deregulation in the United States power industry will
result in utilities and other power generators placing a high emphasis on
reducing costs in their operations. This situation may, in turn, result in
increased competition from other producers of beneficiated coal products,
other clean fuel sources, other developers of combustion optimization software
and other products, services and technologies designed to provide
environmental and operating cost benefits similar to those which we believe
are available from our K-Fuel(R) Technology and Pegasus' combustion
optimization technology and related software.

Our markets are competitive.

         We face competition from other companies in the clean coal and
alternative fuel technology industries as well as the emission control
equipment industry. Many of these companies have financial and managerial
resources much greater than ours and, therefore, may be able to offer products
more competitively priced and more widely available than ours. Also,
competitors' products may make our technology and products obsolete or
non-competitive. Our future success may depend on our ability to adapt to such
changing technologies and competition.

We are subject to risks of changing laws.

         A significant factor driving the creation of the United States market
for K-Fuel(R), other beneficiated coal products, Pegasus combustion
optimization and related software products is the Clean Air Act, as amended,
which specifies various air emission requirements for electrical utility
companies and industrial coal users. We believe that compliance with the air
emission regulations by these coal users can be fully or partially met through
the use of clean-burning fuel technologies, like K-Fuel(R), and combustion
optimization software, like NeuSIGHT(R) and Power Perfecter(TM). We are unable
to predict future regulatory changes and their impact on the demand for our
products. While more stringent laws and regulations, including, without
limitation, new mercury emission standards that are expected to be proposed by
December 15, 2003, may increase demand for our products. Such laws and
regulations could also result in reduced use of coal if utilities switch to
other sources of fuel. Similarly, amendments to the Clean Air Act that would
have the effect of relaxing emissions limitations, or a repeal of the Clean
Air Act would have a material adverse effect on our prospects.

Our inability to adequately protect and defend our proprietary technology
could harm our business.

         Our success depends upon our proprietary technology. We rely on a
combination of patent, copyright, trademark and trade secret rights to
establish and protect our proprietary rights. We currently have a series of
patents on our K-Fuel(R) technology, however, competitors may successfully
challenge the validity or scope of one or more of our patents or any future
allowed patents. These patents alone, our trade secret rights with respect to
NeuSIGHT(R) and indemnification by the licensors of various Pegasus software
products may not provide us with any significant competitive advantage.

         Third parties could copy or otherwise obtain and use our products or
technology without authorization or develop similar technology independently.
We cannot easily police unauthorized use of our technologies. The protection
of our proprietary rights may be inadequate and our competitors could
independently develop similar technology, duplicate our solutions or design
around any patents or other intellectual property rights we hold.

         As is common in the software industry, we may, from time to time
receive notices from third parties claiming infringement by our software
products of third party patent and other property rights.

         Any actions taken by us to enforce our patents or other property
rights could result in significant expense to us as well as the diversion of
management time and other resources. In addition, detecting infringement and
misappropriation of patents or intellectual property can be difficult, and
there can be no assurance that we would detect any infringement or
misappropriation of our proprietary rights. Even if we are able to detect
infringement or misappropriation of our proprietary rights, litigation to
enforce our rights could cause us to divert significant financial and other
resources from our business operations, and may not ultimately be successful.
If we are required to divert significant resources or time to the enforcement
of our proprietary rights, even if the enforcement is successful, our
business, results of operation and financial condition could be materially
adversely affected.

We rely on key personnel and must be able to retain or attract qualified
personnel.

         We believe that our performance is substantially dependent on the
performance of a small group of senior managers and key technical personnel.
The inability to retain key managerial and technical personnel or attract and
retain additional highly qualified managerial or technical personnel in the
future could harm our business or financial condition.

Local opposition to K-Fuel(R) projects could substantially delay or prevent
development of new K-Fuel facilities.

         Development, construction and operation of K-Fuel(R) production
facilities require numerous environmental and other permits. The process of
obtaining these permits can be lengthy and expensive. In addition, local
opposition to a particular project can substantially increase the cost and
time associated with developing a project, and can, potentially, render a
project unfeasible or uneconomical. We may incur substantial costs or delays
or may be unsuccessful in developing K-Fuel(R) production facilities as a
result of such opposition.

A significant portion of the potential of the K-Fuel and Pegasus businesses is
subject to international risks.

         Although our current operations are primarily in the United States,
we believe a significant portion of the growth opportunity for both our
Pegasus and K-Fuel businesses lies outside the United States. Doing business
in foreign countries exposes us to many risks that are not present in the
United States and with which we lack significant experience, including
political, military, privatization, technology piracy, currency exchange and
repatriation risks, and higher credit risks associated with customers. In
addition, it may be more difficult for us to enforce legal obligations in
foreign countries and we may be at a disadvantage in any legal proceeding
within the local jurisdiction. Local laws may also limit our ability to hold a
majority interest in the projects that we develop.

Our ability to take advantage of net operating losses if we achieve
profitability could be limited.

         Under Section 382 of the Internal Revenue Code ("IRC"), the use of
prior net operating losses is limited after an "ownership change," as defined
in Section 382. The limitation, if applicable, is equal to the value of the
loss corporation's outstanding stock immediately before the date of the
ownership change multiplied by a long-term interest rate specified by the IRC.
The quoted market value of a stock is a factor to consider, but not
necessarily a conclusive factor, in determining the fair value of a
corporation's stock. Additional issuances of equity interests by us, or on the
exercise of outstanding warrants or options to purchase our common stock may
result in an ownership change that is large enough to trigger the Section 382
limitations. In the event we achieve profitable operations and taxable income,
any significant limitation on the use of our net operating losses to offset
taxable income would have the effect of increasing our tax liability and
reducing net income and available cash resources.

We are required to pay third parties a significant portion of licensing and
royalty revenues with respect to K-Fuel(R) technology.

         We anticipate that a significant portion of our future revenues with
respect to K-Fuel(R) will be in the form of licensing and royalty payments
from third party licensees operating commercial-scale production facilities of
K-Fuel(R). Pursuant to various agreements we have executed, we are required to
pay third parties a substantial portion of licensing and royalty revenues that
we receive. The Estate of Edward Koppelman is entitled to 25 percent of all
license fees and royalties, with a maximum of approximately $75.2 million;
Fort Union Ltd. is entitled to 20 percent of royalties from K-Fuel(R)
production in the United States, Canada and Mexico, not to exceed $1.5
million; and Ohio Valley Electric is entitled to 0.5 percent of royalties
derived from the sale of K-Fuel(R). As of December 31, 2002, the Estate of
Edward Koppelman has received $275,000 in licensing fees and royalties.
Amounts due under these agreements will decrease our revenues from the
commercialization of the K-Fuel(R) Technology.

We must maintain compliance with the American Stock Exchange ("Amex")
continued listing standards.

         Our common stock is listed on the Amex and to maintain our listing we
must meet certain continued listing standards. Specifically, pursuant to
Section 1003(a)(iii) of the Amex Company Guide, the Amex will consider
delisting a company that has stockholders' equity of less than $6 million if
such company has sustained losses from continuing operations and/or net losses
in its five most recent fiscal years. In the past we have failed to comply
with Amex's listing standards. On April 10, 2003 we received notification from
the Amex that we are currently in compliance with Amex's listing standards.
Going forward, we will continue to be subject to the Amex's listing standards.
There can be no assurance that our common stock will remain listed on the
Amex. If our common stock were delisted from the Amex for any reason, it would
reduce our liquidity and could seriously reduce the value of our common stock,
reduce our ability to raise additional financing, limit our use of equity
instruments to satisfy outstanding obligations and limit our ability to
attract qualified employees. If our common stock is delisted it may, be deemed
to be "penny stock" as that term is defined in Rule 3a51-1 of the Exchange Act
of 1934 and would be subject to additional disclosure requirements for penny
stocks mandated by the Securities Enforcement Remedies and Penny Stock Reform
Act of 1990.

We do not pay cash dividends.

         We have never paid any cash dividends and do not anticipate paying
cash dividends in the foreseeable future.


                                   KFX INC.

         We are a "clean energy" technology company with two principal
business lines. We developed a patented process, which we refer to as
K-Fuel(R) Technology, that transforms low grade, high moisture content coal
into high grade, low moisture content coal. We also provide an advanced
software package for utility boiler optimization through our majority-owned
subsidiary Pegasus Technologies, Inc. ("Pegasus"). Our technology and service
solutions are marketed to the electric power generation industry to facilitate
the industry's compliance with air emission standards, as well as its
transformation to intensive competition as the domestic power industry
undergoes deregulation and restructuring.

         Our patented K-Fuel(R) Technology is a process which uses heat and
pressure to physically and chemically transform low grade (or low BTU), high
moisture content coal into a high grade (or high BTU), low-moisture content
solid clean fuel. We plan to own and operate K-Fuel(R) production facilities,
as well as license K-Fuel(R) Technology domestically and internationally to
third parties. We recently announced the completion of a series of private
equity financings, and a portion of the proceeds of these financings will be
used to construct a commercial K-Fuel(R) production facility. In January 2003,
we completed a feasibility study for the construction and operation of a
commercial K-Fuel(R) plant. This study was prepared under the guidelines of
the K-Fuel LLC Agreement. The feasibility study evaluated the construction
cost and economic returns of a potential K-Fuel(R) plant at three locations in
Wyoming. Kennecott has informed us that they will not participate in
constructing and operating a commercial K-Fuel(R) plant under the guidelines
in the feasibility study. We are currently working on the design and
engineering phases of a potential K-Fuel(R) plant to be constructed in
Wyoming.

         We also offer, through our Pegasus subsidiary, NeuSIGHT(R), a leading
combustion optimization software product for coal-fired electric utility
boilers, which, in addition to improving boiler efficiency, helps reduce
nitrogen oxide emissions. NeuSIGHT(R) is a " neural network-based" (i.e.,
artificial intelligence) software, and was developed by Pegasus. Pegasus
continues to enhance NeuSIGHT(R) and develop related products and market
NeuSIGHT(R) licenses and related implementation services. Pegasus also markets
and installs Power Perfecter(TM), a complementary neural network-based
combustion optimization software product licensed exclusively to us by the
Power Optimization Division of Pavilion Technologies, Inc.

         As described in our Current Report on Form 8-K filed on March 28,
2003, we signed a non-binding letter of intent with Kennecott, providing that
Kennecott will transfer to us all of its membership interest in K-Fuel, LLC
and the full ownership of certain related technology developed by Kennecott.
The contemplated transaction is subject to due diligence, definitive
documentation, to board approval by Kennecott and its parent company, and by
us, and to other conditions.


                                USE OF PROCEEDS

         We will not receive any proceeds from the sale of the shares by the
selling stockholders.


                             SELLING STOCKHOLDERS

         This prospectus relates to the offer and sale from time to time of up
to 1,969,553 shares of common stock by the selling stockholders in the manner
and under the circumstances described under "Plan of Distribution." The shares
include up to 1,921,553 shares of common stock issuable upon the exercise of
warrants and 48,000 shares of common stock. There can be no assurance that the
selling stockholders will sell any or all of their common stock offered by
this prospectus. We do not know if, when, or in what amount the selling
stockholders may offer the common stock for sale.

         The following table sets forth:

         o  the names of the selling stockholders;

         o  any relationship they may have had with us during the last three
            years;

         o  the number of shares of common stock beneficially owned by each of
            the selling stockholders;

         o  the number of shares of common stock being offered by the selling
            stockholders in this prospectus; and

         o  the number of shares of common stock held by the selling
            stockholders and (if 1% or more) the percentage of the class of
            common stock owned by each of the selling stockholders after the
            completion of the offering described in this prospectus.

         This table is based on information furnished to us by or on behalf of
the selling stockholders and for purposes of presenting beneficial ownership
data in the table, we have assumed that the selling stockholders sell all of
the shares offered under this prospectus and that no selling stockholder
acquires additional shares after the date on the cover page of this
prospectus. As of June 12, 2003, there were 47,147,679 shares of our common
stock outstanding.




                                     COMMON STOCK                         COMMON STOCK TO    PERCENTAGE
                                     BENEFICIALLY       COMMON STOCK      BE BENEFICIALLY     OF ALL
                                  OWNED AS OF JUNE     OFFERED IN THIS      OWNED AFTER       COMMON
        NAME                         12, 2003(1)         PROSPECTUS       THIS OFFERING(2)    STOCK(3)
        ----                      ----------------     ---------------    ----------------   ----------

                                                                                     
Evergreen Resources, Inc.(4)         1,000,000            1,000,000                0             --
Theodore Venners(5)                  4,061,604               66,667        3,994,937             8.5%
Mark S. Sexton(6)                      414,166               66,666          347,500             --
Stanley G. Tate(7)                   1,082,247               66,667        1,015,580             2.2%
Dr. James Schlesinger(8)               659,057              383,333          275,724             --
Lori Venners(9)                         66,667               66,667                0             --
U.S. Global, LLC                       181,553              181,553                0             --
C.C.R.I. Corporation(10)                90,000               90,000                0             --
Philip G. Hirsch(11)                    48,000               48,000                0             --

TOTAL                                7,603,294            1,969,553         5,633,741           --

________________
1.       Includes shares issuable upon exercise of warrants and options issued
         to some of the selling shareholders as of June 12, 2003.

2.       For each selling stockholder, this number represents the number of
         shares of common stock to be owned by such selling stockholder after
         completion of the offering and assumes that the selling stockholders
         will sell all shares of common stock offered by them under this
         prospectus and further assumes that all warrants and options have been
         exercised.

3.       For each selling stockholder, this number represents the percentage
         of common stock to be owned by such selling stockholder after
         completion of the offering, based on the number of shares of common
         stock outstanding as of June 12, 2003 (47,147,679 shares) and
         assuming (i) all warrants held by such selling stockholder have been
         exercised, as applicable, and (ii) none of the warrants held by other
         persons have been exercised, as applicable.

4.       Evergreen Resources, Inc. Chairman, Chief Executive Officer and
         President is a director of KFx Inc.

5.       Includes 850,000 shares of which Mr. Venners has the right to acquire
         within 60 days of June 12, 2003 pursuant to the exercise of options
         and 66,667 shares pursuant to the exercise of a warrant. Mr. Venners
         is the Chairman, Chief Executive Officer and President of KFx Inc.

6.       Includes 314,166 shares of which Mr. Sexton has the right to acquire
         within 60 days of June 12, 2003. Mr. Sexton is Chairman, Chief
         Executive Officer and President of Evergreen Resources, Inc. Mr.
         Sexton disclaims beneficial ownership of the warrant held by
         Evergreen Resources, Inc.  Mr. Sexton is a director of KFx Inc.

7.       Includes 336,667 shares of which Mr. Tate has the right to acquire
         within 60 days of June 12, 2003 pursuant to the exercise of options
         and 14,500 shares owned by the Stanley Tate Revocable Trust for which
         Mr. Tate serves as trustee. Mr. Tate is a director of KFx Inc.

8.       Includes 85,000 shares of which Dr. Schlesinger has the right to
         acquire within 60 days of June 12, 2003 pursuant to the exercise of
         options and 303,333 shares pursuant to the exercise of a warrant. Dr.
         Schlesinger is a director of KFx Inc.

9.       Lori Venners is the wife of our Chairman, Chief Executive Officer and
         President, Theodore Venners.

10.      Includes 80,000 shares which C.C.R.I. Corporation has the right to
         acquire within 60 days of June 12, 2003 pursuant to the exercise of
         warrants. C.C.R.I. Corporation was a financial consultant to KFx Inc.
         during 2001.

11.      Since December 15, 2002 Philip G. Hirsch and the Company have been
         parties to a consulting contract in which Mr. Hirsch provides
         financial, strategic and merger and acquisition related services and
         advice.


                             PLAN OF DISTRIBUTION

         We are registering the shares of common stock covered by this
prospectus on behalf of the selling stockholders. The "selling stockholders"
as used in this section of the prospectus shall refer to the selling
stockholders, or their pledgees, donees, transferees, or any of their
successors in interest. All costs, expenses and fees in connection with the
registration of the shares offered hereby will be borne by us. Brokerage
commissions and similar selling expenses, if any, attributable to the sale of
shares will be borne by the selling stockholders. Sales of shares may be
effected by the selling stockholders from time to time in one or more types of
transactions (which may include block transactions) on the American Stock
Exchange or any other organized market or quotation system where the shares
may be traded, in the over-the-counter market, in transactions otherwise than
on the American Stock Exchange or any other organized market or quotation
system where the shares may be traded or the over-the-counter market, in
negotiated transactions, through put or call options transactions relating to
the shares, through short sales of shares, or a combination of such methods of
sale, at market prices prevailing at the time of sale, or at negotiated
prices. The shares may also be transferred pursuant to a gift or pledge. Such
transactions may or may not involve brokers or dealers. Each of the selling
stockholders has advised us that it has not entered into any agreements,
understandings or arrangements with any underwriters or broker-dealers
regarding the sale of their securities, nor is there an underwriter or
coordinating broker acting in connection with the proposed sale of shares by
the selling stockholders.

         The selling stockholders may effect such transactions by selling
shares directly to purchasers or to or through broker-dealers, which may act
as agents or principals. Such broker-dealers may receive compensation in the
form of discounts, concessions, or commissions from the selling stockholders
and/or the purchasers of shares for whom such broker-dealers may act as agents
or to whom they sell as principal, or both (which compensation as to a
particular broker-dealer might be in excess of customary commissions).

         The selling stockholders may enter into hedging transactions. For
example, the selling stockholders may, among other things:

         o  enter into transactions involving short sales of the shares by
            broker-dealers;

         o  sell the shares themselves and deliver the shares registered
            hereby to settle such short sales or to close out stock loans
            incurred in connection with their short positions;

         o  enter into options or other transactions with broker-dealers or
            other financial institutions which require the delivery to such
            broker-dealer or other financial institution of shares offered
            hereby, which shares such broker-dealer or other financial
            institution may resell pursuant to this prospectus (as
            supplemented or amended to reflect such transaction);

         o  loan or pledge the shares to a broker-dealer or other person, who
            may sell the loaned shares or, in the event of default, sell the
            pledged shares; or

         o  any combination of the foregoing.

         Because the selling stockholders may be deemed to be "underwriters"
within the meaning of Section 2(11) of the Securities Act, the selling
stockholders will be subject to the prospectus delivery requirements of the
Securities Act, which may include delivery through the facilities of the
American Stock Exchange pursuant to Rule 153 under the Securities Act. We have
informed the selling stockholders that the anti-manipulative provisions of
Regulation M promulgated under the Exchange Act may apply to their sales in
the market.

         The selling stockholders also may resell all or a portion of the
shares in open market transactions in reliance upon and in compliance with
Rule 144 under the Securities Act.

         Upon being notified by a selling stockholder that any material
arrangement has been entered into with a broker-dealer for the sale of shares
through a block trade, special offering, exchange distribution or secondary
distribution or a purchase by a broker or dealer, we will file a supplement to
this prospectus, if required, pursuant to Rule 424(b) under the Securities
Act, disclosing:

         o  the name of such selling stockholder and of the participating
            broker-dealer(s);

         o  the number of shares involved;

         o  the price at which such shares were sold;

         o  the commissions paid or discounts or concessions allowed to such
            broker-dealer(s), where applicable;

         o  that such broker-dealer(s) did not conduct any investigation to
            verify the information set out or incorporated by reference in
            this prospectus; and

         o  other facts material to the transaction.


                                 LEGAL MATTERS

         The validity of the common stock to be offered by this prospectus is
being passed on for us by Skadden, Arps, Slate, Meagher & Flom LLP.


                                    EXPERTS

         The consolidated financial statements incorporated in this prospectus
by reference from the Company's Annual Report on Form 10-K for the year ended
December 31, 2002 have been audited by Deloitte & Touche LLP, independent
auditors, as stated in their report which is incorporated herein by reference
(which report expresses an unqualified opinion and includes an explanatory
paragraph referring to the adoption of Statement of Financial Accounting
Standards No. 142 "Goodwill and Other Intangible Assets"), and have been so
incorporated in reliance upon the report of such firm given upon their
authority as experts in accounting and auditing.

         The consolidated financial statements incorporated in this
Prospectus by reference to the Annual Report on Form 10-K of KFx, Inc. for the
year ended December 31, 2002, have been so incorporated in reliance on the
report (which contains an explanatory paragraph relating to the Company's
ability to continue as a going concern as described in Note 1 to the
consolidated financial statements) of PricewaterhouseCoopers LLP, independent
accountants, given on the authority of said firm as experts in auditing and
accounting


                    INCORPORATION OF DOCUMENTS BY REFERENCE

         The SEC allows us to "incorporate by reference" certain of our
publicly filed documents into this prospectus, which means that information
included in these documents is considered part of this prospectus. The
following documents filed by us with the SEC are incorporated by reference
into this prospectus:

         o  our annual report on Form 10-K for the year ended December 31,
            2002;

         o  our quarterly report on Form 10-Q for the quarter ended March 31,
            2003;

         o  our Proxy Statement on Schedule 14A for the 2003 annual meeting of
            stockholders;

         o  our current report on Form 8-K filed on June 6, 2003, May 8, 2003,
            April 17, 2003, March 28, 2003, March 11, 2003 and February 6, 2003;
            and

         o  the description of our common stock contained in the Registration
            Statement on Form 10-SB filed with the SEC on July 11, 1994.


         All documents filed by us with the SEC pursuant to Section 13(a),
13(c), 14 or 15(d) of the Securities Exchange Act after the date of this
prospectus and prior to the termination of the offering covered by this
prospectus will be deemed to be incorporated by reference into this prospectus
and to be a part of the prospectus from the date of filing of such documents.
Any statement contained in this prospectus or in any document incorporated or
deemed to be incorporated by reference into this prospectus shall be deemed to
be modified or superseded for purposes of this prospectus to the extent that a
statement contained herein or in any other subsequently filed document which
also is or is deemed to be incorporated by reference herein modifies or
supersedes such statement. Any statement so modified or superseded shall not
be deemed, except as so modified or superseded, to constitute a part of this
prospectus.


                      WHERE YOU CAN FIND MORE INFORMATION

         We file annual, quarterly and special reports, proxy statements and
other information with the Securities and Exchange Commission (the "SEC")
under the Exchange Act. The registration statement of which this prospectus
forms a part and these reports, proxy statements and other information can be
inspected and copied at the Public Reference Room maintained by the SEC at
Room 1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549,
and at the SEC's regional offices at 500 West Madison Street, Suite 1400,
Chicago, Illinois 60661 and at 233 Broadway, New York, New York 10279. Copies
of these materials may also be obtained from the SEC at prescribed rates by
writing to the public reference room maintained by the SEC at Room 1024,
Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549. You may
obtain information on the operation of the Public Reference Room by calling
the SEC at 1-800-SEC-0330.

         We have filed with the SEC a registration statement on Form S-3 under
the Securities Act with respect to this offering. This prospectus, which forms
a part of the registration statement, does not contain all the information
included in the registration statement and the attached exhibits.

         The SEC maintains an Internet site at http://www.sec.gov that
contains reports, proxy and information statements and other information
regarding us. The reports, proxy and information statements, and other
information about us can be downloaded from the SEC's website and can also be
inspected and copied at the offices of the American Stock Exchange, Inc., 86
Trinity Place, New York, New York 10006.

         We will provide, without charge to each person, including any
beneficial owner, to whom this prospectus is delivered, upon written or oral
request of such person, a copy of any and all of the information that has been
or may be incorporated by reference in this prospectus, other than exhibits to
such documents (unless such exhibits are specifically incorporated by
reference into such documents). Such requests should be directed to Corporate
Secretary, KFx Inc., 3300 East First Avenue, Suite 290, Denver, Colorado
80206, telephone number (303) 293-2992.


                                    PART II
                    INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

         The following table sets forth the costs and expenses, payable by the
registrant in connection with the sale of the shares of common stock being
registered. All amounts are estimates except the Securities and Exchange
Commission registration fee.

             Legal fees and expenses                             $10,000
             Accounting fees and expenses                        $15,000
             SEC registration fee                                $   688
             Miscellaneous expenses                              $ 5,000
                                                                 -------
                  Total                                          $30,688

ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS

         Section 102 of the Delaware General Corporation Law, or DGCL, allows
a corporation, in its original certificate of incorporation or an amendment
thereto, to eliminate or limit the personal liability of a director for
violations of the director's fiduciary duty, except where the director
breached his duty of loyalty, failed to act in good faith, engaged in
intentional misconduct or knowingly violated a law, authorized the payment of
a dividend or approved a stock repurchase or redemption in violation of the
DGCL or obtained an improper personal benefit.

         Section 145 of the DGCL empowers a Delaware corporation to indemnify
any person who was or is a party or is threatened to be made a party to any
threatened, pending or completed action, suit or proceeding, whether civil,
criminal, administrative or investigative (other than an action by or in the
right of such corporation) by reason of the fact that such person is or was a
director, officer, employee or agent of such corporation, or is or was serving
at the request of such corporation as a director, officer, employee or agent
of another corporation, partnership, joint venture, trust or other enterprise.
The indemnity may include expenses (including attorney's fees), judgments,
fines and amounts paid in settlement actually and reasonably incurred by such
person in connection with such action, suit or proceeding, provided that such
person acted in good faith and in a manner such person reasonably believed to
be in or not opposed to the best interests of the corporation and, with
respect to any criminal action or proceeding, had no reasonable cause to
believe such person's conduct was unlawful. A Delaware corporation may
indemnify directors, officers, employees and other agents of such corporation
in an action by or in the right of a corporation under the same conditions
against expenses (including attorney's fees) actually and reasonably incurred
by the person in connection with the defense and settlement of such action or
suit, except that no indemnification is permitted without judicial approval if
the person to be indemnified has been adjudged to be liable to the
corporation. Where a present or former director or officer of the corporation
is successful on the merits or otherwise in the defense of any action, suit or
proceeding referred to above or in defense of any claim, issue or matter
therein, the corporation must indemnify such person against the expenses
(including attorneys' fees) which he or she actually and reasonably incurred
in connection therewith.

         Section 174 of the DGCL provides, among other things, that a director
who willfully or negligently approves of an unlawful payment of dividends or
an unlawful stock purchase or redemption, may be held liable for such actions.
A director who was either absent when the unlawful actions were approved or
dissented at the time, may avoid liability by causing his or her dissent to
such actions to be entered into the books containing the minutes of the
meetings of the board of directors at the time such action occurred or
immediately after such absent director receives notice of the unlawful acts.

         We have implemented indemnification provisions in our certificate of
incorporation, providing that officers and directors shall be entitled to be
indemnified by us to the fullest extent permitted by law against expenses
(including attorneys' fees), judgments, fines and amounts paid in settlement
incurred in connection with any action, suit or proceeding by reason of the
fact that he or she is or was an officer or director of us.

         The above discussion of our certificate of incorporation and Sections
102, 145 and 174 of the DGCL is not intended to be exhaustive and is qualified
in its entirety by such certificate of incorporation and statutes.

         Under Section 145(g) of the DGCL, we maintain insurance on behalf of
the directors and officers serving at our request.

ITEM 16. EXHIBITS

         The following is a list of all exhibits filed as part of this
Registration Statement, including those incorporated by reference.

EXHIBIT
NUMBER              DESCRIPTION
4.1 (1)             Sample Common Stock Certificate
5.1                 Opinion of Skadden, Arps, Slate, Meagher & Flom LLP
23.1                Consent of Deloitte & Touche LLP
23.2                Consent of PricewaterhouseCoopers LLP
23.3                Consent of Skadden, Arps, Slate, Meagher & Flom LLP
                    (included in Exhibit 5.1).
24.1                Powers of Attorney (included in the signature page of this
                    Registration Statement).

----------------------------------------------------------------------------
(1)      Document previously filed with the U.S. Securities and Exchange
         Commission with the Company's Annual Report on Form 10-KSB, as
         amended, for the year ended December 31, 1995 and incorporated herein
         by reference.

ITEM 17. UNDERTAKINGS

The undersigned registrant hereby undertakes that, for purposes of determining
any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) of 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering
thereof.

The undersigned registrant hereby undertakes:

1.    To file, during any period in which offers or
      sales are being made, a post-effective
      amendment to this Registration Statement:

      (i)   To include any prospectus required by Section 10(a)(3) of the
            Securities Act of 1933;

      (ii)  To reflect in the prospectus any facts or events arising after the
            effective date of the registration statement (or the most recent
            post-effective amendment thereof) which, individually or in the
            aggregate, represent a fundamental change in the information set
            forth in the registration statement. Notwithstanding the
            foregoing, any increase or decrease in volume of securities
            offered (if the total dollar value of securities offered would not
            exceed that which was registered) and any deviation from the low
            or high end of the estimated maximum offering range may be
            reflected in the form of prospectus filed with the Commission
            pursuant to Rule 424(b) if, in the aggregate, the changes in
            volume and price represent no more than a 20 percent change in the
            maximum aggregate offering price set forth in the "Calculation of
            Registration Fee" table in the effective registration statement;

      (iii) To include any material information with respect to the plan of
            distribution not previously disclosed in the registration
            statement or any material change to such information in the
            registration statement;

         provided, however, that paragraphs (i) and (ii) above do not apply if
         the information required to be included in a post-effective amendment
         by those paragraphs is contained in periodic reports filed with or
         furnished to the Commission by the registrant pursuant to Section 13
         or Section 15(d) of the Exchange Act of 1934 that are incorporated by
         reference in the registration statement.

2.       That, for the purpose of determining any liability under the
         Securities Act of 1933, each such post-effective amendment shall be
         deemed to be a new registration statement relating to the securities
         offered therein, and the offering of such securities at that time
         shall be deemed to be the initial bona fide offering thereof.

3.       To remove from registration by means of a post-effective amendment
         any of the securities being registered that remain unsold at the
         termination of the offering.

Insofar as indemnification for liabilities arising under the Securities Act of
1933 may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the registrant of expenses
incurred or paid by a director, officer or controlling person of the
registrant in the successful defense of any action, suit or proceeding) is
asserted by such director, officer or controlling person in connection with
the securities being registered, the registrant will, unless in the opinion of
its counsel the matter has been settled by controlling precedent, submit to a
court of appropriate jurisdiction the question whether such indemnification by
it is against public policy as expressed in the Act and will be governed by
the final adjudication of such issue.


                                  SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-3 and has duly caused this
Registration Statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in the City of Denver, State of Colorado, on the
17th day of June 2003.

                                    KFX INC.


                                    By:/s/ Theodore Venners
                                       ----------------------
                                    Name:  Theodore Venners
                                    Title: Chairman of the Board of
                                           Directors, President and Chief
                                           Executive Officer

         Each person whose signature appears below hereby severally constitute
and appoint Theodore Venners, as true and lawful attorney-in-fact and agent
with full power of substitution and resubstitution for him and in his name,
place and stead, and in any and all capacities to sign any and all amendments
(including pre-effective and post-effective amendments) to this Registration
Statement, and to file the same with all exhibits thereto, and other documents
in connection therewith, with the Securities and Exchange Commission, and
hereby grants to such attorney-in-fact and agent full power and authority to
do and perform each and every act and thing requisite and necessary to be
done, as fully to all intents and purposes as he might or could do in person,
hereby ratifying and confirming all that said attorney-in-fact and agent, or
his substitute or substitutes may lawfully do or cause to be done by virtue
hereof.

         Pursuant to the requirements of the Securities Act of 1933 this
Registration Statement has been signed below by the following persons in the
capacities and on the dates indicated.



                Signature                                      Title                                 Date


                                                                                     
By: /s/ Theodore Venners                   Chairman of the Board, President and            June 17, 2003
-------------------------------            Chief Executive Officer
Name: Theodore Venners                     (Principal Executive Officer)


By:/s/ Jerry A. Mitchell                   Vice President-Finance and Acting Chief
-------------------------------            Financial Officer                               June 17, 2003
Name: Jerry A. Mitchell                    (Principal Financial and Accounting Officer)


By: /s/ Stanford M. Adelstein               Director                                       June 17, 2003
-------------------------------
Name: Stanford M. Adelstein


By: /s/ Vincent N. Cook                     Director                                       June 17, 2003
-------------------------------
Name: Vincent N. Cook


By: /s/ Richard S. Spencer, III             Director                                       June 17, 2003
-------------------------------
Name: Richard S. Spencer, III


By: /s/ Jack C. Pester                      Director                                       June 17, 2003
-------------------------------
Name: Jack C. Pester


By: /s/ Mark S. Sexton                      Director                                       June 17, 2003
-------------------------------
Name: Mark S. Sexton


By: /s/ Stanley G. Tate                     Director                                       June 17, 2003
-------------------------------
Name: Stanley G. Tate


By: /s/ Dr. James R. Schlesinger            Director                                       June 17, 2003
Name: Dr. James R. Schlesinger


By: /s/ James S. Pignatelli                 Director                                       June 17, 2003
-------------------------------
Name: James S. Pignatelli




Index to Exhibits

EXHIBIT
NUMBER               DESCRIPTION
-------              -----------
4.1 (1)              Sample Common Stock Certificate
5.1                  Opinion of Skadden, Arps, Slate, Meagher & Flom LLP
23.1                 Consent of Deloitte & Touche LLP
23.2                 Consent of PricewaterhouseCoopers LLP
23.3                 Consent of Skadden, Arps, Slate, Meagher & Flom LLP
                     (included in Exhibit 5.1).
24.1                 Powers of Attorney (included in the signature page of this
                     Registration Statement).

-----------------------
(1)      Document previously filed with the U.S. Securities and Exchange
         Commission with the Company's Annual Report on Form 10-KSB, as
         amended, for the year ended December 31, 1995 and incorporated herein
         by reference.


EXHIBIT 5.1



                   Skadden, Arps, Slate, Meagher & Flom LLP
                               Four Times Square
                         New York, New York 10036-6522




                                                  June 17, 2003


KFx Inc.
3300 East First Avenue, Suite 290
Denver, Colorado 80206

         Re:  KFx Inc. - Registration Statement on Form S-3


Ladies and Gentlemen:

                  We have acted as special counsel to KFx Inc., a Delaware
corporation (the "Company"), in connection with the preparation of a
Registration Statement on Form S-3 (the "Registration Statement"), filed with
the Securities and Exchange Commission (the "Commission") under the Securities
Act of 1933, as amended (the "Act"), on June 16, 2003, relating to the
registration under the Act of 1,969,553 shares (the "Shares") of the Company's
common stock, par value $0.001 per share (the "Common Stock"), and such
additional shares of Common Stock as may thereafter be issuable as a result of
anti-dilution adjustments under the Warrants (as defined below). The Shares
consist of 48,000 shares of Common Stock (the "Issued Shares") previously
issued in private offerings to the selling stockholders named in the
Prospectus included in the Registration Statement (the "Prospectus") and
1,921,553 shares of Common Stock (the "Warrant Stock") initially issuable upon
the exercise of Warrants (the "Warrants"). The Shares are to be resold by the
selling stockholders from time to time as set forth in the Registration
Statement and the Prospectus.

                  This opinion is being furnished in accordance with the
requirements of Item 601(b)(5) of Regulation S-K under the Act.

                  In connection with this opinion, we have examined originals
or copies, certified or otherwise identified to our satisfaction, of (i) the
Registration Statement; (ii) a specimen certificate representing the Common
Stock; (iii) the form of the Warrants; (iv) the Restated Certificate of
Incorporation of the Company, as amended to date and currently in effect; (v)
the Second Amended and Restated By-laws of the Company, as amended to date and
currently in effect; (vi) copies of certain resolutions of the Board of
Directors of the Company; and (vii) copies of certain resolutions of the
Executive Committee of the Board of Directors of the Company. We also have
examined originals or copies, certified or otherwise identified to our
satisfaction, of such records of the Company and such agreements, certificates
of public officials, certificates of officers or other representatives of the
Company and others, and such other documents, certificates and records as we
have deemed necessary or appropriate as a basis for the opinions set forth
herein.

                  In our examination, we have assumed the legal capacity of
all natural persons, the genuineness of all signatures, the authenticity of
all documents submitted to us as originals, the conformity to original
documents of all documents submitted to us as certified, conformed or
photostatic copies and the authenticity of the originals of such latter
documents. In making our examination of executed documents, we have assumed
that the parties thereto, other than the Company, had the power, corporate or
other, to enter into and perform all obligations thereunder and have also
assumed the due authorization by all requisite action, corporate or other, and
execution and delivery by such parties of such documents and the validity and
binding effect thereof on such parties. In rendering the opinion set forth in
paragraph 1 below, we have assumed that (i) the Company has received the
entire amount of the consideration contemplated by the resolutions of the
Board of Directors of the Company and the Executive Committee of the Board of
Directors of the Company authorizing the issuance of the Issued Shares; (ii)
that the registrar and transfer agent for the Common Stock duly registered the
issuance of the Issued Shares and countersigned the stock certificates
evidencing such Issued Shares; and (iii) that such stock certificates conform
to the specimen certificate examined by us. In rendering the opinion set forth
in paragraph 2 below, we have assumed that (i) the Warrant Stock will be
issued upon the exercise of the Warrants in accordance with the terms of the
Warrants; (ii) the registrar and transfer agent for the Common Stock will duly
register such issuance and countersign the stock certificates evidencing such
Warrant Shares; and (iii) such stock certificates will conform to the specimen
certificate examined by us. As to any facts material to the opinions expressed
herein which we have not independently established or verified, we have relied
upon statements and representations of officers and other representatives of
the Company and others.

                  Members of our firm are admitted to the bar in the State of
New York, we do not express any opinion as to the laws of any jurisdiction
other than the corporate laws of the State of Delaware, and we do not express
any opinion as to the effect of any other laws on the opinions stated herein.

                  Based upon and subject to the foregoing, we are of the
opinion that:

1.       The Issued Shares have been duly authorized by the Company and are
         validly issued, fully paid and nonassessable.

2.       The Warrant Shares have been duly authorized by the Company and, when
         issued upon exercise of the Warrants and paid for in accordance with
         the terms of the Warrants, will be validly issued, fully paid and
         nonassessable.

                  We hereby consent to the filing of this opinion with the
Commission as an exhibit to the Registration Statement. We also consent to the
reference to our firm under the caption "Legal Matters" in the Registration
Statement. In giving this consent, we do not thereby admit that we are
included in the category of persons whose consent is required under Section 7
of the Act or the rules and regulations of the Commission.

                                    Very truly yours,

                                    Skadden, Arps, Slate, Meagher & Flom LLP





EXHIBIT 23.1


                         INDEPENDENT AUDITORS' CONSENT

We consent to the incorporation by reference in this Registration Statement of
KFx Inc. on Form S-3 of our report dated April 11, 2003, (which report
expresses an unqualified opinion and includes an explanatory paragraph
referring to the adoption of Statement of Financial Accounting Standards No.
142, "Goodwill and Other Intangible Assets"), appearing in the Annual Report
on Form 10-K of KFx Inc. for the year ended December 31, 2002 and to the
reference to us under the heading "Experts" in the Prospectus, which is part
of this Registration Statement.

/s/ Deloitte & Touche LLP

Denver, Colorado
June 16, 2003



EXHIBIT 23.2


                      CONSENT OF INDEPENDENT ACCOUNTANTS

We hereby consent to the incorporation by reference in this Registration
Statement on Form S-3 of our report dated April 12, 2002 relating to the
consolidated financial statements which appears in KFx Inc.'s Annual Report on
Form 10-K for the year ended December 31, 2002. We also consent to the
reference to us under the heading "Experts" in such Registration Statement.

/s/ PricewaterhourseCoopers LLP

Denver, Colorado
June 16, 2003