UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

The Securities Exchange Act of 1934

Date of Report – February 16, 2010

(Date of earliest event reported)

QUESTAR CORPORATION

(Exact name of registrant as specified in its charter)

STATE OF UTAH	001-08796	87-0407509
(State or other jurisdiction of incorporation)	(Commission File No.)	(I.R.S. Employer Identification No.)

180 East 100 South Street, P.O. Box 45433 Salt Lake City, Utah 84145-0433

(Address of principal executive offices)

Registrant's telephone number, including area code (801) 324-5699

                                  Not Applicable                                  

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

[  ]  Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

[  ]  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

[  ]  Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17

       CFR 240.14d-2(b))

[  ]  Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17

       CFR 240.13e-4(c))

Item 7.01  Regulation FD Disclosure

On February 16, 2010, Questar Corporation (the “Registrant”) issued a press release announcing Questar E&P's 2009 production and year-end reserves, providing updates on recent drilling results in key plays and affirming 2010 production guidance. A copy of the Registrant’s release is attached hereto as Exhibit 99.1, and the information contained therein is incorporated herein by reference. The information contained in Item 7.01 to this Form 8-K, including the exhibit, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and the information shall not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such filing.

Item 9.01  Financial Statements and Exhibits.

(c)

Exhibits.

Exhibit No.

Exhibit

     99.1

Press release issued February 16, 2010, by Questar Corporation.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

QUESTAR CORPORATION

   (Registrant)

February 17, 2010

/s/Richard J. Doleshek

Richard J. Doleshek

Executive Vice President and

Chief Financial Officer

List of Exhibits:

Exhibit No.

Exhibit

    99.1

Press release issued February 16, 2010, by Questar Corporation.

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