December 17, 1999

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

Re:	California Independent System Operator Corp.
		Docket No. ER99-3301-003

Dear Secretary Boergers:

	Enclosed for filing please find an original and fourteen copies of the Answer of the California Independent System Operator Corporation to Comments of the Metropolitan Water District of Southern California in the   above-referenced docket.

	An additional copy of the enclosed Answer is provided to be time-stamped and returned to our messenger.  Thank you for your assistance in this matter.

						Respectfully submitted,

						Kenneth G. Jaffe
						Bradley R. Miliauskas
						Swidler Berlin Shereff Friedman, llp
						3000 K Street, N.W.
						Washington, D.C.  20007

						Counsel for the California
						Independent System Operator
						Corporation

CERTIFICATE OF SERVICE

	I hereby certify that I have served the foregoing document upon all parties on the official service list compiled by the Secretary in the above-referenced proceeding, in accordance with the requirements of Rule 2010 of the Commission’s Rules of Practice and Procedure (18 C.F.R. § 385.2010).
	Dated at Washington, D.C. this 17th day of December, 1999.

						_________________________
						Bradley R. Miliauskas