SOUTHWEST GAS CAPITAL I

5,7

Prospectus Supplement for Delayed or Continuous Offering

Registration of Securities on Exchange

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933

Notification of the removal from listing and registration of matured redeemed or retired securities

Notification of the removal from listing and registration of matured redeemed or retired securities