- -------------------------------------------------------------------------------- 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 (Date of earliest event reported) September 10, 1999 SOUTHWEST GAS CORPORATION (Exact name of registrant as specified in its charter) California 1-7850 88-0085720 (State or other jurisdiction of (Commission (I.R.S. Employer incorporation or organization) File Number) Identification No.) 5241 Spring Mountain Road Post Office Box 98510 Las Vegas, Nevada 89193-8510 (Address of principal executive offices) (Zip Code) Registrant's telephone number, including area code: (702) 876-7237 - --------------------------------------------------------------------------------Item 5. Other Events A Procedural Order has been issued by the Arizona Corporation Commission (ACC) extending the hearing on the proposed settlement reached with the staff of the ACC and the Regulatory Utility Consumers Office regarding the proposed merger of Southwest Gas Corporation into a wholly owned subsidiary of ONEOK, Inc. from September 1, 1999 to November 4, 1999, or as soon thereafter as is practical. The purpose of the extension is to allow the submission of additional testimony and evidence. In addition, the ACC has permitted the Arizona Utility Investors Association to intervene in support of the proposed merger. SIGNATURES 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. SOUTHWEST GAS CORPORATION Date: September 10, 1999 /s/ JEFFREY W. SHAW ------------------------------------ Jeffrey W. Shaw Vice President and Treasurer