ATTACHMENT G

EFFECTIVE PRICE FOR
UNINSTRUCTED DEVIATIONS

23.	Temporary Changes to the Real-Time Market for Imbalance Energy  
23.1	Application   
Notwithstanding any other provision of the ISO Tariff, the amendments to the ISO Tariff set forth in Sections 23.2 through 23.5 shall continue in effect until such time as:
(a)	the ISO has applied to the FERC for new, long-term, changes to the ISO Tariff in regard to the Real-Time Market for Imbalance Energy, in connection with implementing a sub-hour Settlement Period; and
(b)	the FERC has approved new, long-term, changes to the ISO Tariff in regard to the Real Time Market for Imbalance Energy.
NOTE: MATERIAL SHOWN AS DELETED IN THE TARIFF SHEETS FOR SECTION 23.2 HAS BEEN OMITTED

23.2	ISO Tariff Amendments
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11.2.4.1	Net Settlements for Uninstructed Imbalance Energy.
Uninstructed Imbalance Energy attributable to each Scheduling Coordinator in each Settlement Period in the relevant Zone shall be deemed to be sold or purchased, as the case may be, by the ISO and charges or payments for Uninstructed Imbalance Energy shall be settled by debiting or crediting, as the case may be, the Scheduling Coordinator with an amount for each Settlement Period equal to the sum of:
(a)	The quantity of undelivered Instructed Imbalance Energy, multiplied by the Effective Price, and
(b)	The quantity of deviation from the final Hour-Ahead Schedule multiplied by the Hourly Ex Post Price.
Imbalance Energy charge will be calculated as follows:

IECharge = DevC + ASSEDevC
where:

and:
The deviation between scheduled and actual Energy Generation for Generator i represented by the Scheduling Coordinator for the Settlement Period is calculated as follows:

GenDevCi = GenDevi * P    in case of (b) above, and
If Ga/s + Gs/e  > 0 and P < Peff  then:
ASSEGenDevCi=Max[0,[Ga/s-Max[0,(Ga-Gadj-Gs)]]]*(Peff-l-P) in case of (a) above, or
If Ga/s + Gs/e < 0 and P > Peff then:
ASSEGenDevCi=Min[0,[Ga/s-Min[0,(Ga-Gadj-Gs)]]]*(Peff-l-P) in case of (a) above
The deviation between scheduled and actual Load consumption for Load i represented by the Scheduling Coordinator for the Settlement Period is calculated as follows:

LoadDevCi = LoadDevi * P    in case of (b) above, and
If La/s + Ls/e > 0 and P < Peff then:
ASSELoadDevCi=Max[0,[La/s-Max[0,(La-Ladj-Ls)]]]*(Peff-l-P) in case of (a) above, or
If La/s + Ls/e < 0 and P > Peff  then:
ASSELoadDevCi=Min[0,[La/s-Min[0,(La-Ladj-Ls)]]]*(Peff-l-P) in case of (a) above

The deviation between forward, scheduled and Real Time adjustments to Energy imports, adjusted for losses, for Scheduling Point q represented by the Scheduling Coordinator for the Settlement Period is calculated as follows:

ImpDevCi = ImpDevi * P    in case of (b) above, and
If Ia/s > 0 and P < Peff  then:
ASSEImpDevCi=Max[0,[Ia/s-Max[0,(Ia-Iadj-Is)]]]*(Peff-q-P) in case of (a) above, or
If Ia/s < 0 and P > Peff then:
ASSEImpDevCi=Min[0,[Ia/s-Min[0,(Ia-Iadj-Is)]]]*(Peff-q-P) in case of (a) above

The deviation between forward, scheduled and Real Time adjustments to Energy exports for Scheduling Point q represented by the Scheduling Coordinator for the Settlement Period is calculated as follows:

ExpDevCq = ExpDevq * P
and where:
G s	=	sum of effective schedules for Day-Ahead and Hour-Ahead
GMMf	=	estimated GMM for Day-Ahead
Ga	=	actual metered Generation
Gadj	=	deviations in real time ordered by the ISO for purposes such as Congestion Management
GMMah=	hour-ahead GMM (proxy for ex-post GMM)
Ga/s	=	Energy generated from Ancillary Service resource  due to ISO dispatch instruction
Gs/e	=	Energy generated from Supplemental Energy resource due to ISO dispatch instruction
Ls	=	sum of Demand scheduled for Day-Ahead and Hour-Ahead
La	=	actual metered Demand
Ladj	=	Demand deviation in real time ordered by ISO for purposes such as Congestion Management
La/s	=	Demand reduction from Ancillary Service resource due to ISO dispatch instruction
Ls/e	=	Demand reduction from Supplemental Energy resource due to ISO dispatch instruction
GMMfq =	estimated GMM for an Energy import at Scheduling Point q for Day-Ahead
GMMahq =	estimated GMM for an Energy import at Scheduling Point q for Hour-Ahead (proxy for ex-post GMM)
ls	=	sum of Scheduled Energy import scheduled through Scheduling Point q for Day-Ahead and Hour-Ahead
la 	=	sum of actual Energy import scheduled through Scheduling Point q.
ladj 	=	deviation in real time import ordered by ISO for purposes such as Congestion Management, and import curtailment.
Ia/s 	=	Energy generated from Ancillary Service System Resources or Supplemental Energy from interties due to dispatch instruction
Es 	=	sum of scheduled Energy export scheduled through Scheduled Point q for Day-Ahead and Hour-Ahead
Ea 	=	sum of actual Energy export scheduled through Scheduling Point q for Day-Ahead and Hour-Ahead
Eadj 	=	deviation in real time export ordered by ISO for purposes such as Congestion Management, and export curtailment
P	=	Hourly Ex Post Price for Uninstructed Imbalance Energy for the relevant hour, as defined in Section 2.5.23.2.2
Peff	=	Effective Price for Instructed Imbalance Energy for the relevant Settlement Period
UnavailAncServMWixt	=	Min[O, PMaxi – Ga – (Gi, oblig – Ga/s)]
Gi, oblig 	=	the amount of Spinning Reserve, the amount of Non-Spinning Reserve, and the amount of Replacement Reserve that Generating Unit or System Resource i has been selected to supply to the ISO, as reflected in final Ancillary Services schedules.
PMaxi	=	the maximum capability (in MW) at which Energy and Ancillary Services may be scheduled from the Generating Unit or System Resource i.
UnavailDispLoadMWixt	=	Max[O, (Li, oblig – La/s) – La]
Li, oblig 	=	the amount of Non-Spinning Reserve and Replacement Reserve that dispatchable Load i has been selected to supply to the ISO, as reflected in final Ancillary Services schedules for Settlement Period t.
UFEC	=	the Unaccounted for Energy Charge for the Scheduling Coordinator calculated as follows:
Unaccounted for Energy Charge
The hourly Unaccounted for Energy Charge on Scheduling Coordinator j for Settlement Period t for each relevant Zone is calculated in the following manner: The UFE for each utility service territory k is calculated as follows,

The Transmission Loss calculation per Settlement Period t per relevant Zone for each utility service territory k is calculated as follows,

Each metered demand point, either ISO grid connected or connected through a UDC, is allocated a portion of the UFE as follows:

The UFE charge for Scheduling Coordinator j per Settlement Period per relevant Zone is then,

Where the terms used in the equations have the following meaning:
	EUFE_UDC_k -- MWh
The Unaccounted for Energy (UFE) for utility service territory k.
	EUFE_z -- MWh
The portion of Unaccounted for Energy (UFE) allocated to metering point z.
	Ik -- MWh
The total metered imports into utility service territory k in Settlement Period t.
	Ek -- MWh
The total metered exports from utility service territory k in Settlement 
Period t.
	Gk -- MWh
The total metered Generation in Settlement Period t in utility service territory k.
	RTMk -- MWh
The Settlement Period t total of the real-time metering in utility service territory k in Settlement Period t.
	LPMk -- MWh
The calculated total of the Load Profile metering in utility service territory k per Settlement Period t.
	TLk -- MWh
The Transmission Losses per Settlement Period t in utility service territory k.
	Dz -- MWh
The Demand including Exports in Settlement Period t at metered point z
The ISO shall develop protocols and procedures for the monitoring of persistent intentional excessive imbalances by Scheduling Coordinators and for the imposition of appropriate sanctions and/or penalties to deter such behavior.  The net balance of the charges attributable to all Scheduling Coordinators represents the Transmission Losses imbalance total for each hourly Settlement Period.

Appendix A - Master Definitions Supplement

Effective Price
	The price, applied to undelivered Instructed Imbalance Energy, calculated by dividing the absolute value of the total payment or charge for Instructed Imbalance Energy by the absolute value of the total Instructed Imbalance Energy, for the Settlement Period; provided that, if both the total payment or charge and quantity of Instructed Imbalance Energy for the Settlement Period are negative, the Effective Price shall be multiplied by -1.0 (minus one). 	

Settlement and Billing Protocol

Appendix D

D 2.1	Imbalance Energy Charges on Scheduling Coordinators

Uninstructed Imbalance Energy attributable to each Scheduling Coordinator in each Settlement Period in the relevant Zone shall be deemed to be sold or purchased, as the case may be, by the ISO and payments for Uninstructed Imbalance Energy shall be settled by debiting or crediting, as the case may be, the Scheduling Coordinator with an amount for each Settlement Period equal to the sum of:
(a)	The quantity of undelivered Instructed Imbalance Energy, multiplied by the Effective Price, and
(b)	The quantity of deviation from the final Hour-Ahead Schedule multiplied by the Hourly Ex Post Price.
Imbalance Energy charge will be calculated as follows:

IECharge = DevC + ASSEDevC
Where:

and
The deviation between scheduled and actual Energy Generation for Generator i represented by Scheduling Coordinator j in Zone x during Trading Interval t is calculated as follows:
GenDevCi = Gs * GMMf –[(Ga - Gadj) * GMMah – Ga/s]- UnavailAncServMWixt
Where:
UnavailAncServMWixt =	Min[0, PMaxi – Ga - (Gi, oblig – Ga/s)]
GenDevCi = GenDevi * P    in case of (b) above, and
If Ga/s + Gs/e > 0 and P < Peff then:
ASSEGenDevCi=Max[0,[Ga/s-Max[0,(Ga-Gadj-Gs)]]]*(Peff-l-P) in case of (a) above, or
If Ga/s + Gs/e < 0 and P > Peff then:
ASSEGenDevCi=Min[0,[Ga/s-Min[0,(Ga-Gadj-Gs)]]]*(Peff-l-P) in case of (a) above
The deviation between scheduled and actual Load consumption for Load i represented by Scheduling Coordinator j in Zone x during Trading Interval t is calculated as follows:

- UnavailDispLoadMWixt
Where:
UnavailDispLoadMWixt	=	Max[0, (Li, oblig – La/s) –La]
LoadDevCi = LoadDevi * P    in case of (b) above, and
If La/s + Ls/e > 0 and P < Peff then:
ASSELoadDevCi=Max[0,[La/s-Max[0,(La-Ladj-Ls)]]]*(Peff-l-P) in case of (a) above, or
If La/s + Ls/e < 0 and P > Peff then:
ASSELoadDevCi=Min[0,[La/s-Min[0,(La-Ladj-Ls)]]]*(Peff-l-P) in case of (a) above
The deviation between forward scheduled and Real Time adjustments to Energy imports*, adjusted for losses, for Scheduling Point q represented by Scheduling Coordinator j into zone x during Trading Interval t is calculated as follows:
ImpDevq = Is * GMMfq – [(Ia – Iadj) *GMMahq]+Ia/s
ImpDevCi = ImpDevi * P    in case of (b) above, and
If Ia/s > 0 and P < Peff then:
ASSEImpDevCi=Max[0,[Ia/s-Max[0,(Ia-Iadj-Is)]]]*(Peff-q-P) in case of (a) above, or
If Ia/s < 0 and P > Peff then:
ASSEImpDevCi=Min[0,[Ia/s-Min[0,(Ia-Iadj-Is)]]]*(Peff-q-P) in case of (a) above

The deviation between forward scheduled and Real Time adjustments to Energy exports* for Scheduling Point q represented by Scheduling Coordinator j from Zone x during Trading Interval t is calculated as follows:

		ExpDevCq = ExpDevq * P

Settlement and Billing Protocol 

Appendix D

D 3	Meaning of terms of formulae
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D 3.9	Ga/s – MWh
The Energy generated from Ancillary Service resource i due to ISO dispatch instructions.  This value will be calculated based on the projected impact of the Ancillary Services dispatch instruction(s) over the time period within the Trading Interval for which such Ancillary Services dispatch instruction(s) applies.

D.3.9.1		Gs/e - MWh
The Energy generated from Supplemental Energy resource i due to ISO dispatch instructions.  This value will be calculated based on the projected impact of the Supplemental Energy dispatch instruction(s) over the time period within the Trading Interval for which such Supplemental Energy dispatch instruction(s) applies.

* * * * *

D 3.17	La/s – MWh
The Energy reduction by curtailable Load due to ISO dispatch of Ancillary Services from such curtailable Load (i.e., Load bidding into the Ancillary Services markets).  This value will be calculated based on the projected impact of the Ancillary Services dispatch instruction(s) over the time period within the Trading Interval for which such Ancillary Services dispatch instruction(s) applies.

D. 3.17.1	Ls/e - MWh
The Energy reduction by curtailable Load due to ISO dispatch of Supplemental Energy from such curtailable Load.  This value will be calculated based on the projected impact of the Supplemental Energy dispatch instruction(s) over the time period within the Trading Interval for which such Supplemental Energy dispatch instruction(s) applies.

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D 3.25	Pxt – $/MWh
The Hourly Ex Post Price for Imbalance Energy for the relevant Trading Interval.  This value is calculated as the weighted average of the 12 Five Minute Ex Post Prices in each Zone during each hour.  The Five Minute Ex Post Price is equal to the bid price of the marginal resource accepted by the ISO for dispatch and deemed eligible to set the price during a five minute period.
D 3.25.1	Peff    $
Effective Price for Instructed Imbalance Energy for the relevant Settlement Period.
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