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 – May 18, 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 May 18, 2010, Questar Corporation issued a press release announcing that its Board of Directors has authorized management to proceed with a tax-free spin-off to shareholders of its natural gas and oil exploration and production and midstream field services businesses to form an independent, publicly traded company to be named QEP Resources, Inc. The transaction is subject to market conditions, successful restructuring of certain credit facilities and final approval of certain material agreements by the boards of both companies.  

A copy of the press release is attached as Exhibit 99.1 and is incorporated herein by reference. Questar Corporation has also posted a copy of materials presented at its May 18, 2010, annual meeting of shareholders to its Web site at www.questar.com

Item 9.01

Financial Statements and Exhibits.

(c)

Exhibits.

Exhibit No.

Exhibit

     99.1

Press release issued May 18, 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 hereunto duly authorized.

QUESTAR CORPORATION

(Registrant)

Date: May 21, 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 May 18, 2010, by Questar Corporation.

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