As filed with the Securities and Exchange Commission on 
February 13, 1996 
 
                                   Registration No. 33-64743 
____________________________________________________________ 
 
           SECURITIES AND EXCHANGE COMMISSION 
               Washington, D.C.  20549 
                     -----------          
 
            POST-EFFECTIVE AMENDMENT NO. 1 
                          to 
                       FORM S-4 
                REGISTRATION STATEMENT 
                        under 
               THE SECURITIES ACT OF 1933 
                      -------------           
 
                    ENOVA CORPORATION 
   (Exact name of registrant as specified in its charter) 
         (formerly known as SDO Parent Co., Inc.) 
 
 
 
   California                           6719                   33-0643023 
(State or other jurisdiction (Primary Standard Industrial(I.R.S. Employer 
of incorporation or organization) Classification Code Number) Identification
 No.) 
 
                     101 Ash Street 
              San Diego, California 92101 
                     (619) 696-2000 
   (Address, including ZIP Code, and telephone number, 
including area code, of registrant's principal executive 
                       offices) 
                      __________ 
                    David R. Clark 
                    101 Ash Street 
              San Diego, California 92101 
                    (619) 696-2000 
(Name, address, including ZIP Code, and telephone number, 
        including area code, of agent for service) 
                      __________ 
It is requested that copies of communications be sent to: 
                    David R. Snyder 
              Pillsbury Madison & Sutro LLP 
               101 W. Broadway, Suite 1800 
               San Diego, California 92101 
                      (619) 544-3369 
 
 
     If the securities being registered on this Form are 
being offered in connection with the formation of a holding 
company and there is compliance with General Instruction G, 
check the following box. [_] 
 
               -------------------------------- 
 
     This registration statement shall hereafter become 
effective in accordance with the provisions of Section 8(c) 
of the Securities Act of 1933. 
 
 
 
____________________________________________________________ 
 
 

<PAGE>
 
                      DEREGISTRATION 
 
 
 
     The Registrant hereby amends the Registration Statement 
on Form S-4 (No. 33-64743 - the "Registration Statement") to 
reduce the amount of securities registered thereunder 
pursuant to an undertaking contained in the Registration 
Statement.  Effective as of January 1, 1996 (at 12:01 a.m. 
PST), a subsidiary of the Registrant, San Diego Merger 
Company, was merged (the "Merger") with and into San Diego 
Gas & Electric Company ("SDG&E).  Shares of the Registrant's 
Common Stock were issued to the former holders of SDG&E 
Common Stock as a result of the Merger (as described in the 
Registration Statement); however, not all shares of the 
Registrant's Common Stock which were registered pursuant to 
the Registration Statement were issued in the Merger.  The 
amount of securities registered pursuant to the Registration 
Statement is hereby reduced by 57,642 shares, which equals 
the number of securities registered in the Registration 
Statement (100,000) and a related Registration Statement on 
Form S-4 (No. 33-57007 - which registered 116,541,000 
shares) less the number of shares issued pursuant to the 
Merger (116,583,358). 
 
 
 
 
 
 
                         SIGNATURE 
 
 
     Pursuant to the requirements of the Securities Act of 
1933, the Registrant has duly caused this Post-Effective 
Amendment No. 1 to the Registration Statement to be signed 
on its behalf by the undersigned, thereunto duly authorized, 
in the City of San Diego, State of California, on February 
13, 1996. 
 
 
                                    ENOVA CORPORATION 
 
 
 
                                By:/s/ David R. Clark                        
                                   ------------------------ 
                                   David R. Clark 
                                   Assistant General Counsel 


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