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RPRS Settlement Examples

RPRS Settlement Examples. March 14, 2006. Presented by ERCOT Art Deller Bill Kettlewell. Market Support Services March 30, 2005. The Players. INTRODUCING. ELECTRONS R US. A Load-Scheduling QSE Scheduler for EZWATTS Retail Electric Provider. Wholesale Power Trader. The Players.

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RPRS Settlement Examples

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  1. RPRS Settlement Examples March 14, 2006 Presented by ERCOT Art Deller Bill Kettlewell Market Support Services March 30, 2005

  2. The Players INTRODUCING ELECTRONS R US • A Load-Scheduling QSE • Scheduler for EZWATTS Retail Electric Provider. • Wholesale Power Trader

  3. The Players AND ALSO STARRING PowerHouse • A Generation and Power Marketing QSE • Markets and Schedules WATTSup power generation company. • Qualified to provide Ancillary Services. • Provide Power Marketing Services.

  4. The Setting Three Congestion Zone model: West North South

  5. The Setting Shift Factors CSC Zonal Average Weighted Shift Factors

  6. Act 1 Capacity Insufficiency

  7. The Story ELECTRONS R US • Electrons R Us submits the following schedule in the Day Ahead Period to cover their load in the South Zone: • Electrons R Us has a Load Ratio Share of 1%.

  8. The Story PowerHouse • PowerHouse has a generator, Gator Gulch, in the North Zone that is scheduled to be off-line but available on June 27, 2006 with the following Replacement Bid Prices: • Startup Price = $120 / MW • Hourly Run Price = $25 / MW • ERCOT procures Gator Gulch as Replacement Reserve during the Day-Ahead Period for Capacity Insufficiency. • There is no Zonal or Local Congestion.

  9. The Story RPRS Settlement Process: • Pay Providers: • Capacity Insufficiency • Zonal Congestion • Local Congestion • Collect from Users: • Under Scheduled QSEs • Zonal Congestion • Uplift to Market

  10. The Story Pay Providers: • Capacity Insufficiency • Zonal Congestion • Local Congestion

  11. Pay Providers of Capacity PowerHouse Zonal Replacement Reserve (LCFLAG = 0) Steps: • ZRPQ – Awarded amount • ZRPHR – Number of hours awarded • Apply Bids to calculate ZPCRPAMT

  12. Hours Hr10 Hr11 Hr12 Hr13 Hr14 Hr15 Hr16 Hr17 Hr18 Hr19 Hr20 Hr21 LCFLAG ........ 2 2 1 1 1 0 0 0 0 2 2 2 ....... Interval Int57 Int58 Int59 Int60 Int61 Int62 Int63 Int64 Int65 Int66 Int67 Int68 HSL ........ 143 144 146 147 157 161 156 154 158 155 157 154 ....... Hours Hr10 Hr11 Hr12 Hr13 Hr14 Hr15 Hr16 Hr17 Hr18 Hr19 Hr20 Hr21 ZRPQ ........ 0 0 0 0 0 145 156 156 156 0 0 0 ....... Pay Providers of Capacity ZRPQ – Zonal Replacement Quantity RPRSMW = 156 Hour 15 (Intervals 57 – 60): ZRPQ = MIN[156,( 143 + 144 + 146 + 147 )/ 4] = 145

  13. Hours Hr10 Hr11 Hr12 Hr13 Hr14 Hr15 Hr16 Hr17 Hr18 Hr19 Hr20 ZRPQ ........ 0 0 0 0 0 145 156 156 156 0 ....... ZRPHR ........ 0 0 0 0 0 4 4 4 4 0 ....... Pay Providers of Capacity ZRPHR – number of hours instructed ZRPHR = 4

  14. Pay Providers of Capacity ZPCRPAMT– Zonal Procured Capacity Replacement Amount

  15. Pay Providers of Capacity ZPCRPAMT– Zonal Procured Capacity Replacement Amount ZPCRPAMT = -$8030

  16. The Story Collect from Users: • Under Scheduled QSEs • Zonal Congestion • Uplift to Market

  17. RPRS Under Scheduled Charge Steps: • Use maximum MCPC for any RPRS Market for the Operating day • Find the Maximum difference between the QSEs Adjusted Metered Load and Scheduled Load for any period in which there was an RPRS Market • Add the amount of the Maximum Mis-Matched quantity for any Interval with an RPRS Market

  18. RPRS Under Scheduled Charge 0, MaxM(AMLi1zq-CLi1zq) USRPizq= MaxM(MCPCRPizq) * Max MaxM(AMLi2zq-CLi2zq)+MMQizqMaxM(AMLi3zq-CLi3zq) MaxM(AMLi4zq-CLi4zq) Variables US = RPRS Under Scheduled Charge AML = Adjusted Meter Load CL = Current Scheduled Load MCPC = Market Clearing Price for Capacity MMQ = Mismatched Amount Subscripts M = Market i = Interval z = Congestion Management Zone q = QSE RP = Replacement Reserve

  19. RPRS Under Scheduled Charge ELECTRONS R US Adjusted Metered Load vs. Scheduled Load at time of RPRS Procurement Scheduled Scheduled Scheduled Scheduled Metered Metered Metered Metered Hour Ending 1500 Max Difference = 10MW

  20. RPRS Under Scheduled Charge For Hour Ending 1500: • Maximum MCPC = $55 • Maximum Under Scheduled amount = 10MW • Maximum Mismatch amount = 0MW

  21. RPRS Under Scheduled Charge For Hour Ending 1500, Electrons R Us pays USRPAMT = $55 * (10MW) = $550 Other QSE’s besides Electrons R US also pay USRPAMT, such that the total collected is USRPBILLAMTTOT = $55 * (100MW) = $5500

  22. The Story Collect from Users: • Under Scheduled QSEs • Zonal Congestion • Uplift to Market

  23. RPRS Uplift Charge Steps: • Calculate total costs of Procured RPRS Capacity. • Calculate total RPRS Underscheduled Charge. • Calculate total Replacement Capacity payments to TCR holders. • Calculate total CSC impact Replacement Capacity charge. • Sum all of the above and multiply by Load Ratio Share.

  24. RPRS Uplift Charge UCRP = -1 * [ Σ ( PCRP + LPCRP ) + Σ USRP + TCRPAYRP +Σ CSCRP ]* LRS Variables UC = RPRS Uplift Charge PC = Cost of Capacity for Zonal Congestion and Capacity Insufficiency LPC = Cost of RPRS for Local Congestion US = RPRS Under Scheduled Charge TRCRPAY = TCR Payment per Hour CSC = RPRS CSC Impact Capacity Charge LRS = Load Ratio Share Subscripts RP = Replacement Reserve

  25. RPRS Uplift Charge For Hour Ending 1500, Electrons R Us pays UCRP = -1 * [ Σ PCRP + Σ USRP]* LRS UCRPAMT = -1*(ZPCRPBILLAMTTOT + USRPBILLAMTTOT) * LRS = -1*(-$8030 + $5500) * 0.01 = $25.30

  26. Act 2 Zonal Congestion

  27. The Story ELECTRONS R US • Electrons R Us submits the following schedule in the Day Ahead Period to cover their load in the North Zone: • Electrons R Us has a Load Ratio Share of 1%.

  28. The Story PowerHouse • PowerHouse has a generator, Gator Gulch, in the North Zone that is scheduled to be off-line but available on June 27, 2006 with the following Replacement Bid Prices: • Startup Price = $120 / MW • Hourly Run Price = $25 / MW • ERCOT procures Gator Gulch as Replacement Reserve during the Day-Ahead Period for Zonal Congestion. • The South to North CSC is constrained.

  29. The Story RPRS Settlement Process: • Pay Providers: • Capacity Insufficiency • Zonal Congestion • Local Congestion • Collect from Users: • Under Scheduled QSEs • Zonal Congestion • Uplift to Market

  30. The Story Pay Providers: • Capacity Insufficiency • Zonal Congestion • Local Congestion

  31. Pay Providers of Capacity PowerHouse Zonal Replacement Reserve (LCFLAG = 0) Steps: (Same as with Capacity Insufficiency) • ZRPQ – Awarded amount • ZRPHR – Number of hours awarded • Apply Bids to calculate ZPCRPAMT

  32. Pay Providers of Capacity ZPCRPAMT– Zonal Procured Capacity Replacement Amount ZPCRPAMT = -$8030

  33. The Story Collect from Users: • Under Scheduled QSEs • Zonal Congestion • Uplift to Market

  34. RPRS Under Scheduled Charge Just as before, in Hour Ending 1500, Electrons R Us pays USRPAMT = $55 * (10MW) = $550 Other QSE’s besides Electrons R US also pay USRPAMT, such that the total collected is USRPBILLAMTTOT = $55 * (100MW) = $5500

  35. The Story Collect from Users: • Under Scheduled QSEs • Zonal Congestion • Uplift to Market

  36. RPRS Zonal Congestion Charge Example: West North Load1 = 90MW Load2 = 95MW Load3 = 100MW Load4 = 105MW Res1 = 90MW Res2 = 95MW Res3 = 100MW Res4 = 105MW South

  37. RPRS Zonal Congestion Charge CSCRPhq = SPCCSCh* MAX (0, ICSChq)) ICSChq = MAX [0,MAX [Σ ((QSSTOPiqz – QOSTOPiqz) * SFzcsc)z ]n] Subscripts i = Interval h = Hour being calculated n = Number of time RPRS is procured TOP = Time of Replacement q = QSE z = Congestion Management Zone Variables CSC = Commercially Significant Constraint I =Scheduled MW Impact QSS = QSE Supply Schedule QOS = QSE Obligation Schedule SF = Shift Factor SPC = Shadow Price for Capacity

  38. RPRS Zonal Congestion Charge Calculate the Schedule Impact • For each interval in Hour Ending 1500, Calculate the impact on the the South to North constraint as follows: • ImpactSouth = (Resource – Obligation) * SFSN • ImpactNorth = (Resource – Obligation) * SFSN • ImpactSN = ImpactSouth+ ImpactNorth • The hourly impact is the maximum interval impact during the hour.

  39. RPRS Zonal Congestion Charge Calculate the Schedule Impact • The hourly impact is the maximum interval impact during the hour; • ICSC = 65.47 MW

  40. RPRS Zonal Congestion Charge Calculate the Congestion Charge CSCRPAMT = (Impact) * Shadow Price for Capacity = ICSC * MCPCSPC = (65.47MW)($100/MW) = $6547.00

  41. The Story Collect from Users: • Under Scheduled QSEs • Zonal Congestion • Uplift to Market

  42. RPRS Uplift Charge UCRP = -1 * [ Σ ( PCRP + LPCRP ) + Σ USRP + TCRPAYRP +Σ CSCRP ]* LRS Variables UC = RPRS Uplift Charge PC = Cost of Capacity for Zonal Congestion and Capacity Insufficiency LPC = Cost of RPRS for Local Congestion US = RPRS Under Scheduled Charge TRCRPAY = TCR Payment per Hour CSC = RPRS CSC Impact Capacity Charge LRS = Load Ratio Share Subscripts RP = Replacement Reserve

  43. RPRS Uplift Charge For Hour Ending 1500, Electrons R Us pays UCRP = -1 * [ Σ PCRP + Σ USRP + TCRPAYRP + Σ CSCRP ]* LRS UCRPAMT = -1*[ ZPCRPBILLAMTTOT + USRPBILLAMTTOT + (TCROWNEDERCOT * MCPCSPC) + CSCRPQSEBILLAMTTOT] * LRS = -1*[-$8030 + $5500 - (500MW * $100/MW) + $51,000 ] * 0.01 = $15.30

  44. Act 3 Local Congestion

  45. The Story PowerHouse • PowerHouse has a generator, Swamp Thing Unit 1, in the South Zone that is scheduled to be off-line but available on June 27, 2006 with the following Replacement Bid Prices: • Startup Price = $120 / MW • Hourly Run Price = $25 / MW • ERCOT procures Swamp Thing Unit 1 as Replacement Reserve during the Adjustment Period for Local Congestion. • There is no Zonal Congestion.

  46. The Story Data for Swamp Thing Unit 1 • Gas-Steam Reheat Boiler • RCGSC = $3000 + (FIP * 16.5 MMBtu/MW * RMC) • RCGMEC = 17.0 MMBtu/MW * FIP • Power House brings the unit on and operates at 100 MW during the instructed hours Note: RMC (Resource Maximum Capacity) is the average HSL during the first hour of the instructed period. PowerHouse

  47. The Story RPRS Settlement Process: • Pay Providers: • Capacity Insufficiency • Zonal Congestion • Local Congestion • Collect from Users: • Under Scheduled QSEs • Zonal Congestion • Uplift to Market

  48. The Story Pay Providers: • Capacity Insufficiency • Zonal Congestion • Local Congestion

  49. Pay Providers of Capacity PowerHouse Local Replacement Reserve (LCFLAG = 1) Steps • LRPQ – Awarded amount • LRPHR – Number of hours awarded • LPS – Start up payment • LPO – Operation payment

  50. Pay Providers of Capacity LRPQ – Local Replacement Quantity Hours Hr10 Hr11 Hr12 Hr13 Hr14 Hr15 Hr16 Hr17 Hr18 Hr19 Hr20 Hr21 LCFLAG ........ 2 2 2 2 2 1 1 1 1 2 2 2 ....... Interval Int57 Int58 Int59 Int60 Int61 Int62 Int63 Int64 Int65 Int66 Int67 Int68 HSL ........ 124 125 127 128 128 128 128 128 128 127 127 126 ....... LSL ........ 75 76 78 79 79 79 79 79 79 78 78 77 ....... Hours Hr10 Hr11 Hr12 Hr13 Hr14 Hr15 Hr16 Hr17 Hr18 Hr19 Hr20 Hr21 LRPQ ........ 0 0 0 0 0 126 128 127 127 0 0 0 ....... Hour 15 (Intervals 57 – 60): LRPQ =( 124 + 125 + 127 + 128 )/ 4] = 126

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