- -------------------------------------------------------------------------------- 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) January 20, 2000 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 new Procedural Order has been issued by the Arizona Corporation Commission (ACC) further extending the hearing on the proposed merger of Southwest Gas Corporation and a wholly owned subsidiary of ONEOK, Inc. to February 22, 2000. On January 10, 2000, ONEOK requested a 10-day delay in filing its rebuttal testimony to a January ACC staff report. In response, the ACC staff requested that the hearing be postponed to February 22, 2000 in order to give the ACC staff sufficient time to review ONEOK's filing and to conduct additional discovery, if necessary. 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: January 20, 2000 /s/ EDWARD A. JANOV ----------------------------- Edward A. Janov Vice President/Controller and Chief Accounting Officer