CAISO. Settlements & Billing. Real Time Excess Cost for Instructed Energy Allocation CC 6486
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1 CAISO Settlements & Billing Real Time Excess Cost for Instructed Energy Allocation CC 6486
2 Table of Contents 1. Purpose of Document 3 2. Introduction Background Description 4 3. Charge Code Requirements Business Rules Predecessor Charge Codes Successor Charge Codes Inputs External Systems Inputs - Predecessor Charge Codes or Pre-calculations CAISO Formula Outputs 8 CAISO 2009 Page 2 of 9
3 1. Purpose of Document The purpose of this document is to capture the requirements and design specification for a SaMC Charge Code in one document. 2. Introduction 2.1 Background Prior to MRTU, CT 4481, Excess Cost for Instructed Energy, included Bid Cost Recovery (payment uplift) for Economic Instructed Imbalance Energy (Economic IIE), Hourly Pre-Dispatched Instructed Imbalance Energy (IIE Predispatch) and Residual Imbalance Energy for costs above the CAISO s Bid Ceiling or costs for Energy bid below the CAISO s Bid Floor (capped at the bid floor); and Out-of-Market Energy (OOM Energy) payment for costs in excess of the Resource-Specific Ex Post Price. Charge Code (CC) 6482 Real-Time Excess Cost for Instructed Energy Settlement replaces CT 4481 in MRTU. Bids over the Bid Ceiling or below the Bid Floor are hardcapped in MRTU. In CC 6482 there remains the need to settle Excess Cost Payments for incremental IIE priced above the Resource-Specific Settlement Interval Real-Time LMP (including cases where the Exceptional Dispatch price is above the Bid Ceiling). However, the Settlement of Excess Cost Payments for decremental IIE priced below the Resource-Specific Settlement Interval Real-Time LMP is not required since the entire Exceptional Dispatch price is settled completely (without any excess cost breakdown) in CC CC 6482 settles the Excess Cost Payments for Energy transactions where the Settlement type is one of the emergency exceptional Energy types ( SYSEMR or TEMR ) as defined in CAISO Tariff Section and , respectively. The SYSEMR Exceptional Dispatch Energy type represents Energy, including Energy from forced Start-Ups and Shut Downs that is delivered as a result of an Exceptional Dispatch for System Emergency conditions, to avoid intervention in market operations, mitigate Overgeneration conditions, or to prevent or relieve an imminent System Emergency. TEMR represents Energy purchased by the CAISO from a utility in another Control Area as a result of a CAISO request for assistance in System Emergency conditions, in order to avoid an intervention in market operations, or to prevent or relieve an imminent System Emergency. TEMR Energy excludes Energy from Exceptional Dispatches. CC 6482 does not cover Excess Cost Payments for IIE associated with transmission and other various reasons not related to emergency conditions, as they are covered in other charge codes (for instance, CC 6488 Exceptional Dispatch Uplift Settlement ). Emergency Energy for either SYSEMR or TEMR will be settled at the higher of the Resource-Specific Settlement Interval LMP, Energy Bid price or, if applicable, the Default Energy Bid price for Energy that does not have an Energy Bid price, or, as applicable to System Resources, the negotiated price. The negotiated System Resource Energy price may exceed the Bid Ceiling. The allocation for Real-Time Excess Cost for Instructed Energy Settlement will remain unchanged in MRTU. The costs will be allocated in two tiers based total negative Uninstructed Imbalance Energy in CC 6486 Real Time Excess Cost for Instructed Energy Allocation and Measured Demand excluding Demand served through transmission rights in CC 6480 Excess Cost Neutrality Allocation. CAISO 2009 Page 3 of 9
4 2.2 Description The allocation of costs paid to Scheduling Coordinators in the Real Time Excess Cost for Instructed Energy Settlement is split into two tiers. The first tier of costs is collected in this CC 6486, Real Time Excess Cost for Instructed Energy Allocation. This charge type collects the total costs associated with CC 6482 Real-Time Excess Cost for Instructed Energy Settlement to the extent that the total Energy procured with price above Resource-Specific Settlement Interval LMP is less than or equal to total Net Negative Uninstructed Imbalance Energy quantity in the corresponding interval. If the total quantity of Energy procured in CC 6482 is greater than the quantity of Net Negative Uninstructed Imbalance Energy, only the portion of Excess cost up to the Net Negative UIE is allocated in CC 6486, the remaining amount is recovered in CC 6480 Excess Cost Neutrality Allocation. 3. Charge Code Requirements 3.1 Business Rules Bus Req ID Business Rule Excess Cost Payment calculated in CC 6482 where the price was in excess of the Resource-Specific Settlement Interval LMP is allocated in two tiers. CC 6486 allocates the Excess Cost Payments to Scheduling Coordinators the lesser of (a) the pro-rata share of Excess Cost Payments based on the ratio of each Scheduling Coordinator s Net Negative UIE to the total CAISO Net Negative UIE or (b) the product of the Scheduling Coordinator s Net Negative UIE and a weighted average price for that interval. The weighted average price is calculated as the total Excess Cost Payments paid in CC 6486 divided by the Energy quantity associated with the Excess Cost Payments in CC PIR units do not receive daily Excess Cost Payment allocations; their allocations are calculated separately and accrued in CC 721 for monthly settlement. Resources that have Energy Bids available in the Real Time Market, but are not dispatched by CAISO for that interval are exempt from Real Time Excess Cost for Instructed Energy allocation to the extent their Energy Bid quantity covers their Net Negative UIE. The formulas adopt the convention that payments made by CAISO to BAs will be negative, while payments received by CAISO from BAs will be positive. The signs reflect the flow of money from the point of view of CAISO. 6.0 This Charge Code must be computed daily on a 10-minute basis. 7.0 PIRExcessCostIIEAllocationAccrualAmount md is passed to Intermittent Resources Net Deviations Allocation (CC 721) for account balancing purposes. CAISO 2009 Page 4 of 9
5 3.2 Predecessor Charge Codes Charge Code/ Pre-calc Name Real Time Energy Quantity Pre-calculation Real Time Price Pre-calculation Real Time Excess Cost for Instructed Energy Settlement (CC 6482) 3.3 Successor Charge Codes Excess Cost Neutrality Allocation (CC 6480) Charge Code/ Pre-calc Name Intermittent Resources Net Deviations Allocation (CC 721) 3.4 Inputs External Systems Row # Variable Name Description 1 PIREligFlag Brtdh PIR eligibility flag for PIRP Business Associate B per Resource r for Trading Day d and Trading Hour h. Y identifies a PIR unit that is eligible to receive monthly netting treatment. N identifies PIR unit that is NOT eligible to receive monthly netting treatment. 2 AvailableUndispatchedBidQuantity Brthi resource that was undispatched in a Settlement Available Bid quantity for a Interval. 3.5 Inputs - Predecessor Charge Codes or Pre-calculations Row # Variable Name Predecessor Charge Code/ Precalc Configuration 1 SettlementIntervalRealTimeUIE BrtuT I M F S hi CG PC RT Energy Pre-calculation 2 CAISOTotalExcessCostIIESettlementAmoun Total Excess Cost payments made to Scheduling Coordinators in CC CAISO 2009 Page 5 of 9
6 3 t hi SettlementIntervalIIEExcessCostQuantity Brthi 6482 for the Settlement Interval. This variable will not be found in the configuration guide for CC6482. Rather a CAISO subtotal current amount is used. CG CC 6482 Excess Cost for Instructed Energy 4 SettlementIntervalMSSIIE BrtuT I M F S hi CG PC RT Energy Pre-calculation 3.6 CAISO Formula ExcessCostIIEAllocationAmount Bhi ExcessCostIIEAllocationAmount Bhi = ( ExcessCostAllocationDeviationQuantity Bhi + PIRExcessCostAllocationDeviationQuantity Bhi ) * ExcessCostAllocationPrice hi Where ExcessCostAllocationPrice hi = (-1)*CAISOTotalExcessCostIIESettlementAmount hi / max (CAISOTotalExcessCostIIEQuantity hi, CAISOTotalNetNegativeUIEQuantity hi ) Where CAISOTotalNetNegativeUIEQuantity hi = ABS ( B NetNegativeUIEQuantity Bhi ) NetNegativeUIEQuantity Bhi = MIN (0, PIRUnitRealTimeUIE Bhi ) + MIN (0, NonPIRUnitRealTimeUIE Bhi ) CAISOTotalExcessCostIIEQuantity hi = B r t SettlementIntervalIIEExcessCostQuantity Brthi ) ( PIRExcessCostAllocationDeviationQuantity Bhi = (-1) * MIN ( 0, PIRUnitRealTimeUIE Bhi ) ExcessCostAllocationDeviationQuantity Bhi = (-1) * MIN ( 0, NonPIRUnitRealTimeUIE Bhi ) IF PIREligFlag Brtdh = Y CAISO 2009 Page 6 of 9
7 THEN NonPIRUnitRealTimeUIE Bhi = 0 ELSE NonPIRUnitRealTimeUIE Bhi = r t ( BASettlementResourceNetUIEQuantity Brthi ) END IF PIRUnitRealTimeUIE Bhi = ( PIREligFlag Brtdh * r t BASettlementResourceNetUIEQuantity Brthi ) BASettlementResourceNetUIEQuantity Brthi = u T ' I ' M ' F ' S ' ( SettlementIntervalRealTimeUIE BrtuT I M F S hi + AvailableUndispatchedBidQuantity Brthi + SettlementIntervalMSSIIE BrtuT I M F S hi ) PIRExcessCostIIEAllocationAccrualAmount md PIRExcessCostIIEAllocationAccrualAmount md = B h i PIR10MExcessCostIIEAllocationAccrualAmount Bhi Where CAISOSettlementPIRExcessCostIIEAllocationAccrualAmount hi = where And B PIR10MExcessCostIIEAllocationAccrualAmount Bhi PIR10MExcessCostIIEAllocationAccrualAmount Bhi = (-1) * PIRExcessCostAllocationDeviationQuantity Bhi * ExcessCostAllocationPrice hi CAISOTotalExcessCostIIEAllocationAmount hi CAISOTotalExcessCostIIEAllocationAmount hi = B (ExcessCostIIEAllocationAmount Bhi + PIR10MExcessCostIIEAllocationAccrualAmount Bhi ) CAISO 2009 Page 7 of 9
8 3.7 Outputs Output ID Name Description 1 ExcessCostIIEAllocationAmount Bhi Cost Payments up to the amount of net-negative UIE Daily allocation of Excess for non-pir resources. 2 PIRExcessCostIIEAllocationAccrualAmount md monthly allocation of Excess Cost Payments for PIR units Daily accrual amount for only. 3 CAISOTotalExcessCostIIEAllocationAmount hi Total market sum of Excess Cost Payment allocation. 4 PIRExcessCostAllocationDeviationQuantity Bhi Settlement PIR deviation quantity for the Interval 5 ExcessCostAllocationPrice hi Excess Cost Payment allocation price used to calculate the BA s allocation amount for the Settlement Interval 6 ExcessCostAllocationDeviationQuantity Bhi allocation quantity charge in the BA s allocation amount Excess Cost Payment for the Settlement Interval 7 CAISOTotalExcessCostIIEQuantity hi Energy Quantity associated with the Total Excess Cost Payments made to Scheduling Coordinators in CC 6482 for the Settlement Interval 8 CAISOTotalNetNegativeUIEQuantity hi The absolute sum of Scheduling Coordinator s Net Negative UIE quantities in the Settlement Interval 9 PIR10MExcessCostIIEAllocationAccrualAmount Bhi 10-minute Settlement Interval amount of Excess Cost Payments for PIR units only. 10 NetNegativeUIEQuantity Bhi Net Negative UIE quantity for the settlement interval CAISO 2009 Page 8 of 9
9 Output ID Name Description 11 NonPIRUnitRealTimeUIE Bhi and MSS IIE (MSS Load Following) for the settlement Non-PIR Unit Real Time UIE interval 12 PIRUnitRealTimeUIE Bhi MSS IIE (MSS Load Following) for the settlement PIR Unit Real time UIE and interval 13 BASettlementResourceNetUIEQuantity Brthi CAISOSettlementPIRExcessCostIIEAllocationAcc rualamount hi In addition to any outputs listed above, all external inputs shall be included as outputs. Settlement Interval Net UIE Quantity per BA, Resource r, Resource Type t, and Settlement Interval I for Trading Hour h CAISO 10-minute Settlement Interval amount of Excess Cost Payments for PIR units only. CAISO 2009 Page 9 of 9
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