August 24, 1998

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

		Re:  	Williams Energy Services Company
			Docket No. ER98-3106-000

Dear Secretary Boergers:

	Enclosed for filing is an original and fourteen copies of the Rehearing Request of the California Independent System Operator Corporation in the above-cited proceedings.  An additional copy of the filing is also enclosed.   I would appreciate your stamping the additional copy with the date filed and returning it to the messenger.

	 				Respectfully submitted,

					Michael E. Ward 
					Counsel for the California Independent System
						Operator Corporation