August  20, 1998

The Honorable David P. Boergers
Acting Secretary
Federal Energy Regulatory Commission
888 First Street, N.E.
Washington, D.C.  20426

Re:	California Independent System Operator Corporation, 
	Docket Nos. EC96-19-036 and ER-1663-040

Dear Secretary Boergers:

On August 14, 1998,  the California Independent System Operator Corporation (“ISO”) submitted for filing an amendment (“Amendment No. 11”) to the ISO Tariff, to which the above docket numbers were assigned.
The ISO explained that Amendment No.11 would modify the ISO Tariff and Protocols in certain respects relating to the ISO’s procurement of Ancillary Services.  The ISO asked the Commission to consider Amendment No. 11 on an expedited basis and to permit it to take effect as early as September 1, 1998, on the assumption that the software modifications necessary to implement the amendment’s modifications would be installed and tested by that date.  
The ISO has been advised by its vendor that the delivery and installation of the software will be delayed.  The ISO now projects that the earliest date that the testing of the software could be completed is September 21, 1998.  The ISO accordingly modifies its requested effective date for Amendment No. 11 to be the later of: (1) September 21, 1998; or (2) the date of a Commission order accepting Amendment No. 11 for filing. 

A notice of filing for this letter, suitable for publication in the Federal Register is enclosed.   Copies of this letter are being served on all parties on whom the ISO’s original filing in these dockets was served.

Thank you for your attention to this filing.  If there are any questions, please contact the undersigned.

Respectfully submitted,

__________________________
N. Beth Emery
Vice President and General Counsel
Roger E. Smith, Regulatory Counsel
The California Independent
    System Operator Corporation

Edward Berlin
Kenneth G. Jaffe
David B. Rubin
Swidler  Berlin Shereff Friedman, LLP

Counsel for 
The California Independent System Operator Corporation

cc:   Daniel L. Larcamp, Esq.
        Office of General Counsel