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 – April 21, 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 April 21, 2010, Questar Corporation announced it is considering a possible tax-free spin-off of the Company’s natural gas and oil exploration and production (E&P) business. The new E&P company would be comprised of Questar subsidiaries Questar E&P Company, Questar Gas Management, and Questar Energy Trading. After the spin-off, Questar Corporation would remain an integrated natural gas company comprised of subsidiaries Wexpro Company, Questar Pipeline Company, and Questar Gas Company. Questar has engaged financial and legal advisors to assist with the evaluation. Subject to certain precedent conditions and board approval, the spin-off transaction may occur in the second half of 2010.

Item 9.01

Financial Statements and Exhibits.

Exhibits.

Exhibit No.

Exhibit

     99.1

Press Release - Questar Considering Spin-off

of Exploration and Production Business

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 hereunto duly authorized.

QUESTAR CORPORATION

(Registrant)

Date: April 26, 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 - Questar Considering Spin-off

of Exploration and Production Business

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