Configuration Guide: Day Ahead Congestion - AS Regulation Down Import Settlement

Transcription

1 Settlements and Billing Configuration Guide: Day Ahead Congestion - AS Regulation Down Import Settlement CC 6760 Version 5.10

2 Table of Contents 1. Purpose of Document 3 2. Introduction Background Description 3 3. Charge Code Requirements Business Rules Predecessor Charge Codes Successor Charge Codes Inputs - External Systems Inputs - Predecessor Charge Codes or Pre-calculation CAISO Formula Outputs 8 4. Charge Code Effective Date 11 CAISO, 2012 Page 2 of 11

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 Suppliers of awarded Ancillary Services (AS) in the Day Ahead market (DAM) are paid the Ancillary Service Marginal Price (ASMP) for the Day Ahead market at the relevant interties. However, because AS capacity imports and Energy schedules compete for transmission capacity at interties, the suppliers of awarded Day Ahead AS capacity imports are also charged Congestion Costs based on applicable Shadow Prices at binding intertie constraints associated with the resources. This Charge Code is part of the family of Charge Codes for settling Day Ahead AS Congestion costs emanating from the following AS product awards: (1) Regulation Up Import, (2) Regulation Down Import, (3) Spinning Reserve Import, and (4) Non-Spinning Reserve Import. Per CAISO Tariff Section , to the extent an Ancillary Service procured in the IFM from a System Resource becomes undispatchable due to an intertie transmission derate, in rescinding the Ancillary Service capacity payment, the CAISO shall credit back to the Scheduling Coordinator Congestion Charge assessed pursuant to Section of the CAISO Tariff, but at the higher of the Day-Ahead and HASP Shadow Prices on the corresponding intertie. The keyword lower in the Tariff is replaced here with higher to account for the usual sign of the shadow prices - these are usually negative values, and thus preserve the intent of the FERC order. The Billable Quantity that will be refunded shall be limited to the Undispatchable Capacity that was due to a transmission derate. 2.2 Description This Charge Code applies to System Resources for awarded Regulation Down import capacity whenever Congestion is present in the export direction over the intertie constraint associated with the resource, on an hourly basis at the resource level. The Settlement Amount is the product of (a) the Award MW import capacity of Day-Ahead Regulation Down AS and (b) the negative of Day-Ahead export direction Shadow Price for the intertie constraint associated with the resource for the Trading Hour. Revenues collected from this Charge Code will be used to fund the settlement of CRRs. A refund of Congestion Charge is embedded in this Charge Code. The refund is limited CAISO, 2012 Page 3 of 11

4 to the quantity of Undispatchable Capacity due to a transmission derate as per CAISO Tariff Section , and shall be assessed at the higher of the Day-Ahead and HASP Shadow Prices for Import of AS Regulation Down for the relevant Trading Hour, assuming usual negative shadow prices. 3. Charge Code Requirements 3.1 Business Rules Req ID Business Rule The Congestion Charge for Regulation Down import at a System Resource per hour is the product of (a) the awarded MW hourly capacity of Day-Ahead Regulation Down AS and the (b) negative of Day-Ahead export direction Shadow Price for the intertie constraint associated with the resource for the Trading Hour. The charge per BA per hour h is the sum of all the congestion charges for Regulation Down import at its System Resources for the hour. If Congestion is present in the import direction, Day Ahead AS RegDown Importers will not be paid nor charged for the counter-flows over the applicable intertie constraint. (Fact) 1.3 Not used For adjustments to the Charge Code that cannot be accomplished by correction of Downstream data inputs/recalculation or operator override Pass Through Bill Charge logic will be applied. A refund of Congestion Charge shall be given to System Resources, where the refund is limited to the quantity of Undispatchable Capacity due to a transmission derate as per CAISO Tariff Section , assessed at the higher of the Day-Ahead Shadow Price and the simple average of RT Shadow Prices over the hour of the associated intertie constraints for a non-hourly predispatchable resource, for Import of AS Regulation Down for the relevant Trading Hour. The keyword lower in the Tariff is replaced here with higher to account for the usual sign of the shadow prices - these are usually negative values The Regulation Down import Undispatchable Capacity MW value due a refund cannot exceed the MW values for DA Award Regulation Down import. CAISO, 2012 Page 4 of 11

5 3.2 Predecessor Charge Codes Ancillary Services Pre-Calculation Charge Code/ Pre-calc Name Regulation No Pay Quantity Pre-Calculation Formatted: Highlight 3.3 Successor Charge Codes Charge Code/ Pre-calc Name CC 6765 Real-Time Congestion AS Regulation Down Import Settlement CC CRR Hourly Settlement 3.4 Inputs - External Systems Row # Variable Name 1 DAExportShadowPrice a h 2 3 PTBChargeAdjustmentDACongest ionregdownamount BJh DAtoHASP_OTCReductionInExpo rtdirectionflag a h Description Day-Ahead Shadow Price for Intertie Constraint a for Trading Hour h. It is the marginal value of relieving the particular intertie constraint for congestion in the export direction. ($/MW) Note: This usually comes in as negative. Pass through Bill (PTB) amount for this charge code to be settled with Business Associate B, identified by PTB ID J, for Trading hour h. ($) The flag is set to a value of 1 whenever there is a reduction of the OTC in the export direction in HASP from the Day-Ahead capacity. In such a case, there was a transmission derate at the intertie constraint affecting the Scheduling Point /Resource Location r for the Trading Hour h. CAISO, 2012 Page 5 of 11

6 Row # Variable Name Description This flag has a value of 0 or is Null or is not created whenever there was no reduction in OTC capacity affecting resource r for Trading Hour h. NoPayRegDownBidQty 4 BrtuT I M VL W R F S a hi 45 RTExportShadowPrice a hc Non Compliance Regulation Down associated with Awarded Bid Capacity for the Business Associate B resource r, resource type t, intertie constraint ID a for Trading Day d and Trading Hour h during Settlement Interval i This input may contain portion of Day-Ahead Undispatchable Capacity due to transmission derate that would be eligible for charge refund. (MWh) External input from Compliance Real Time Shadow Price for Intertie Constraint a for 15-min commitment interval c of Trading Hour h. It is the marginal value of relieving the particular intertie constraint for congestion in the export direction. ($/MW) Note: This usually comes in as negative. 3.5 Inputs - Predecessor Charge Codes or Pre-calculation Row # Variable Name 1 DARegDownAward BrtF S a dh 2 BAHourlyNoPayRegDownBid_DAImportCongQuantity BrtF S a h Predecessor Charge Code/ Precalc Configuration Ancillary Services Pre-Calculation Attribute d is dropped in the formulas. Regulation No Pay Quantity Pre- Calculation Formatted: Font: Not Italic, Highlight Formatted: Highlight Formatted: Highlight CAISO, 2012 Page 6 of 11

7 3.6 CAISO Formula DA Congestion RegDown import amount for Business Associate B, Resource r, and Trading Hour h: DACongestionRegDownAmount BrtF S h = (DACongestionRegDownAwardChargeAmount BrtF S h + DARegDownUndispatchableCapacityRefundAmt BrtF S h ) Where DACongestionRegDownAwardChargeAmount BrtF S h = a ' (-1) * DARegDownAward BrtF S a h * DAExportShadowPrice a h Where Resource Type t = ITIE Note: This filter is redundant as the quantity input is already filtered in AS Pre-calculation And DARegDownUndispatchableCapacityRefundAmt BrtF S h = a ' a h)) (DARegDownUndispatchableCapacityQty BrtF S a h * max(daexportshadowprice a h, HourlyAverageRTExportShadowPrice Where HourlyAverageRTExportShadowPrice a h = c (0.25 * RTExportShadowPrice a hc ) CAISO, 2012 Page 7 of 11

8 And Where DARegDownUndispatchableCapacityQty BrtF S a h = min[daregdownaward BrtF S a h, (BAHourlyNoPayRegDownBid_DAImportCongQuantity BrtF S a h * DAtoHASP_OTCReductionInExportDirectionFlag a h )] Where Resource Type t = ITIE And Where BAHourlyNoPayRegDownBid_DAImportCongQuantity BrtF S a h = u T ' I ' M ' V L ' W R i NoPayRegDownBidQty BrtuT I M VL W R F S a hi Where Resource Type t = ITIE DA AS Regulation Down Congestion Charge per Business Associate B and Trading Hour h: BAHourlyDACongestionRegDownAmount Bh = r t F ' S ' DACongestionRegDownAmount BrtF S h Note: This is provided as part of reporting structure and is not configured as an individual charge type. This is shown as a reporting BD in the BD matrix file CAISO total DA congestion revenue from Regulation Down import for Trading Hour h: CAISOHourlyTotalDACongestionRegDownAmount h = B BAHourlyDACongestionRegDownAmount Bh Note: This is provided as part of reporting structure and is not configured as an individual charge type. This is shown as a reporting BD in the BD matrix file. 3.7 Outputs CAISO, 2012 Page 8 of 11

9 Output Req ID Name Description In addition to any outputs listed below, all inputs shall be included as outputs. DACongestionRegDownAmount BrtF S h BAHourlyDACongestionRegDownAm ount Bh CAISOHourlyTotalDACongestionReg DownAmount h DARegDownUndispatchableCapacity RefundAmt BrtF S h All inputs. The Congestion Charge for Business Associate B for scheduling RegDown at a congested Import Resource r where location type t = ITIE, Entity Component Type F, Entity Component Subtype S,for Trading Hour h of the DAM. ($) The Congestion Charge for Business Associate B for scheduling RegDown for Trading Hour h of the DAM. ($) This is provided as part of reporting structure and is not configured as an individual charge type. This is shown as a reporting BD in the BD matrix file. The CAISO total DA Congestion revenue from RegDown Imports for Trading Hour h. ($) This is provided as part of reporting structure and is not configured as an individual charge type. This is shown as a reporting BD in the BD matrix file. The amount of Regulation Down Congestion Charge refund for Undispatchable Capacity due to a transmission derate affecting Scheduling Point / System Resource r of resource type t, Entity Component Type F, Entity Component Subtype S, for Business Associate B for Trading Hour h. ($) CAISO, 2012 Page 9 of 11

10 Output Req ID Name Description BAHourlyNoPayRegDownBid_DAImp ortcongquantity BrtF S a h DARegDownUndispatchableCapacity Qty BrtF S a h DACongestionRegDownAwardCharg eamount BrtF S h HourlyAverageRTExportShadowPrice a h Hourly Non-compliance Regulation Down Bid. This may contain the Undispatchable Capacity due to a transmission derate, affecting Scheduling Point / System Resource r of resource type t, Entity Component Type F, Entity Component Subtype S, intertie constraint a in the export direction, for Business Associate B for Trading Hour h across all markets. (MW) The recognized Day-Ahead Undispatchable Capacity due to a transmission derate that is eligible for refund. (MWh) This is for Business Associate B, resource r, resource type t, Entity Component Type F, Entity Component Subtype S, intertie constraint a for Trading Hour h. The congestion charge for DA AS Regulation Down Import Award. This includes the charge for Undispatchable Capacity that would be refunded in valid cases. This is for Business Associate B, resource r, resource type t, Entity Component Type F, Entity Component Subtype S for Trading Hour h. The hourly average Real Time Export Shadow Price for resources associated with intertie constraint a for Trading Hour h. CAISO, 2012 Page 10 of 11

11 4. Charge Code Effective Date Charge Code/ Pre-calc Name Document Version Effective Start Date Effective End Date Version Update Type CC 6760 Day Ahead Congestion - AS Regulation Down Import Settlement CC 6760 Day Ahead Congestion - AS Regulation Down Import Settlement /01/09 Open11/30/ /01/12 Open Documentation Edits Only Configuration Impacted CAISO, 2012 Page 11 of 11