Exhibit A

UNITED STATES OF AMERICA
BEFORE THE
FEDERAL ENERGY REGULATORY COMMISSION

Pacific Gas and Electric Company, 
San Diego Gas & Electric Company,	Docket Nos. EC96-19-___
and Southern California Edison Company	and ER96-1663-___

AMENDMENT NO. 5

SUBMITTED ON
March 3, 1998

ISO TARIFF
TEMPORARY SIMPLIFICATION MEASURES

	This amendment would establish two new sections of the ISO Tariff, Sections 21 and 22, which would contain the temporary simplification measures.
	The simplification measures are as follows:
GENERATION METER MULTIPLIER
	Proposed Section 21 would set the Generation Meter Multiplier to 1.0 for scheduling purposes.  This is necessary for two reasons.  First, setting GMMs to 1.0 will make it easier to balance Energy portfolios and Inter-Scheduling Coordinator Trades involving the PX.  Second, the ISO is concerned that using different rules for the PX versus other Scheduling Coordinators would increase the potential for errors and delays in submitting and validating Schedules, particularly in the first weeks of full operations.  By initially imposing this rule on all Scheduling Coordinators, the ISO will have sufficient time to complete its scheduling process by making it easier to determine whether Schedules are balanced and reducing the risk of Schedules being rejected.
	Once the ISO has been in operation and established a consistent record of timely validation and posting of Schedules, there will be more time to handle differences between the PX and the other Scheduling Coordinators.  The ISO will at that time allow Scheduling Coordinators to revert to the use of forecasted GMMs.  The PX will continue to use a GMM of 1.0 until its software is able to process forecasted GMMs.  For both the period when the GMM is set at 1.0 for Schedules and when the forecasted GMMs are used, the settlements process will remain unchanged.
	Section 21 reads as follows:
21.	Generation Meter Multipliers.
21.1	Temporary Simplification Relating to GMM Loss Factors.
	Notwithstanding any other provision in the ISO Tariff, including the ISO Protocols, in determining whether a Schedule is a Balanced Schedule, no allowance shall be made for Transmission Losses (i.e. the Generation Meter Multiplier shall be set at 1.0) for the PX and all other Scheduling Coordinators.
21.2	Application.
	Notwithstanding any other provision in this Tariff, including the ISO Protocols, the temporary simplification measure specified in this Section 21 shall have effect until discontinued by a Notice of Full-Scale Operations issued by the Chief Executive Officer of the ISO.
21.2.1	Pursuant to Subsections 21.3.1 and 21.3.2, the Chief Executive Officer of the ISO shall give notice to all Scheduling Coordinators, except the PX, that such Scheduling Coordinators shall use forecasted Generation Meter Multipliers, as published by the ISO, in their Schedules.  Such notice shall be given only after the Chief Executive Officer determines that the ISO is capable of accepting schedules using the forecasted Generation Meter Multipliers without adversely affecting operations or reliability.
21.2.2	Pursuant to Subsections 21.3.1 and 21.3.2, the Chief Executive Officer of the ISO shall give notice to the PX that the PX shall use forecasted Generation Meter Multipliers, as published by the ISO, in its Schedules, upon mutual agreement by the Chief Executive Officers of the ISO and PX that the PX is capable of providing schedules pursuant to this Tariff using the ISO's forecasted Generation Meter Multipliers without adversely affecting operations or reliability.
21.3	Notices of Full-Scale Operations.
21.3.1	When the Chief Executive Officer of the ISO determines that the ISO is capable of implementing this Tariff, including the ISO Protocols, without modification in accordance with a temporary simplification measure specified in this Section 21, he shall issue a notice (“Notice of Full-Scale Operations”) and shall specify the relevant temporary simplification measure and the date on which it will permanently cease to apply, which date shall be not less than seven (7) days after the Notice of Full-Scale Operations is issued.

21.3.2	A Notice of Full-Scale Operations shall be issued when it is posted on the ISO Internet “Home Page,” at http://www.caiso.com or such other internet address as the ISO may publish from time to time.

SCHEDULE VALIDATION TOLERANCES
	Section 22 increases the ISO schedule validation tolerance from 1 MW to 20 MW.  This simplification reduces the risk of Schedules being rejected as unbalanced, thereby giving the ISO more time to complete its scheduling process.  Under this change, a Schedule will be treated as a Balanced Schedule when aggregate Generation, adjusted for Transmission Losses by the relevant GMM, is within 20 MW of aggregate Demand.
	Section 22 reads as follows:
22.	SCHEDULE VALIDATION TOLERANCES.
22.1	Temporary Simplification of Schedule Validation Tolerances.
	Notwithstanding any other provision in the ISO Tariff, including the ISO Protocols, a Schedule shall be treated as a Balanced Schedule when aggregate Generation, adjusted for Transmission Losses, is within 20 MW of aggregate Demand.
22.2	Application.
	Notwithstanding any other provision in this Tariff, including the ISO Protocols, the temporary simplification measure specified in this Section 22 shall have effect until discontinued by a Notice of Full-Scale Operations issued by the Chief Executive Officer of the ISO.
22.3	Notices of Full-Scale Operations.
22.3.1	When the Chief Executive Officer of the ISO determines that the ISO is capable of implementing this Tariff, including the ISO Protocols, without modification in accordance with a temporary simplification measure specified in this Section 22, he shall issue a notice (“Notice of Full-Scale Operations”) and shall specify the relevant temporary simplification measure and the date on which it will permanently cease to apply, which date shall be not less than seven (7) days after the Notice of Full-Scale Operations is issued.
22.3.2	A Notice of Full-Scale Operations shall be issued when it is posted on the ISO Internet "Home Page," at http://www.caiso.com or such other internet address as the ISO may publish from time to time.