1 CERTIFICATE OF TRUST The undersigned, the trustees of Southwest Gas Capital I desiring to form a business trust pursuant to Delaware Business Trust Act, 12 Del. C. section 3810 hereby certify as follows: (a) The name of the business trust being formed hereby (the "Trust") is Southwest Gas Capital I. (b) The name and business address of the trustee of the Trust which has its principal place of business in the State of Delaware is as follows: Wilmington Trust Company 1100 N. Market Street Wilmington, Delaware 19890 Dated: August 17, 1995 George C. Biehl, as Trustee /s/ GEORGE C. BIEHL ------------------- Jeffrey W. Shaw, as Trustee /s/ JEFFREY W. SHAW ------------------- Wilmington Trust Company, as Trustee By: /s/ NORMA P. CLOSS ------------------ Norma P. Closs Title: Vice President Exhibit 4.05