Energy Imbalance Market Technical Workshop. BAA Real-Time Congestion Balancing Account August 12, 2013

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1 Energy Imbalance Technical Workshop BAA Real-Time Congestion Balancing Account August 12, 2013

2 Overview BAA Real-Time Congestion Balancing Account Real Time Convergence Bid Settlement Slide 2

3 BAA Real-Time Congestion Balancing Account Calculate total real time neutrality amount by BAA Net of all imbalance energy settlements 15 min and 5 min Instructed Energy settlement Generating/intertie resources, participating load, NGR Uninstructed Imbalance Energy settlement Non participating load (hourly) Generating/intertie resources, participating load, NGR (5 min) Unaccounted For Energy (5 min) Extract congestion offset by BAA Net of marginal congestion cost contributions from all binding constraints in a BAA to all imbalances Allocate congestion offset to respective BAA Slide 3

4 Example Assumptions CAISO BAA and two EIM BAAs Two generators and two loads in each BAA No Day Ahead schedules No base schedules Single Real Time interval: one hour No transmission losses Transmission Congestion in each BAA Generator meter equals schedule MPs are indicative (no OPF solver) Slide 4

5 BAA 1 BAA 2 CAISO G 1 80 G 3 60 G 5 60 G 2 50 G 4 90 G NSI NSI NSI 0 80 T 1 30 G 1 G BAA 1 T 1 T 3 CAISO G 5 G BAA 2 G 3 G T 3 T 2 20 T 2 Slide 5

6 Shift Factors and Power Contributions Resource Schedule T 1 T 2 T 3 SF SF SF G G G G G G Total Slide 6

7 Marginal Congestion Cost Contributions Res Sch T 1 T 2 T 3 SF SP MCC SF SP MCC SF SP MCC G $ $ $48 G $ $ $ $ $ $ $ $ $360 G $ $ $54 G $ $ $0 $10 $20 $ $ $ $ $ $ $42 G $ $ $360 G $ $ $ $ $ $1, $ $ $1,230 Total 0 $300 $400 $600 EIM Workshop: Real Time Congestion Offset Allocation Slide 7

8 Imbalance Energy Settlement Res Sch MEC T 1 T 2 T 3 MP Payment SF SP SF SP SF SP G $42.00 $3,360 G $53.00 $2, $ $1, $ $2,790 G $48.50 $2,910 G $55.50 $4,995 $50 $10 $20 $ $ $1, $ $4,354 G $53.60 $3,216 G $34.00 $2, $ $6, $ $3,570 Total 0 -$1,300 EIM Workshop: Real Time Congestion Offset Allocation Slide 8

9 BAA Real Time Congestion Balancing Account results BAA 1 congestion uplift on T 1 : $300 BAA 2 congestion uplift on T 2 : $400 ISO congestion uplift on T 3 : $600 Slide 9

10 and Schedule on EIM Constraint Slide 10

11 Define BAA Real-Time Congestion Balancing Account by RTCBA Where λ SF Q Q FI FI n, n n = λ n a = λ withdrawal. at node n. [ SF ( Q Q )] n, [ FI FI ] is the shadow price of constraint in 15 - minute market. is the shift factor of node n with respect to constraint in the15- minute market. is the net scheduled MW at node n in the15 - minute market. is the net scheduled base MW, including both virtual and physical schedules, MWs for EIM BAs is the base schedule. CAISO is the IFM schedule. n Negative Q MWs for is the total scheduled flow impact on constraint from15 - minute market schedules. is the total scheduled flow impact on constraint from base schedules. n n is Slide 11

12 Define BAA Real-Time Congestion Balancing Account by and RTCBA = λ = λ = λ [ ] FI FI [( ) ] : : FI + FI FI [ ] [ ] : : FI FI + λ FI BAA Real-Time Congestion Balancing Account from constraint is function of: Change in scheduled physical flows between base and 15- minute schedules Change in scheduled virtual flows between base and 15-minute schedules Slide 12

13 Bid from RT Congestion Uplift Conges tion Uplift from 1 from MW 900 MW 1,000 MW 200MW * λ 300MW * λ -100MW * λ 200MW * λ 0 Slide 13

14 3 rd Revised Straw Proposal: Allocation of BAA RT Congestion Balancing Account from EIM Entity Constraints Assign RT Congestion uplift from EIM BAA constraints into virtual bucket and physical bucket In direct proportion to out-of-market congestion revenues received by virtual and physical schedules Allocate physical bucket to EIM Entity balancing account Allocate virtual bucket to virtual schedules In proportion to each schedule s receipt of the out-of-market revenues Approach is only applied where there is an out of market charge RT congestion uplift allocation to virtual schedules for EIM-BA constraint : λ ( [ ( [ ])] : max 0, min FI, FI FI ) * Slide 14

15 Problem with 2 nd Revised Straw virtual settlement proposal Conges tion Uplift from 1 from MW 1,400 MW 1,000 MW 400MW * λ -300MW * $0 400MW * λ 0 400MW * λ Slide 15

16 Allocation Example: Counter-flow Allocation : λ * : ( max[ 0, min( FI,[ FI FI ])] ) Conges tion Uplift from 1 from 1 Allocation Allocation -300 MW 1,400 MW 1,000 MW 100MW * λ -300MW * λ 400MW * λ 0 100MW * λ Slide 16

17 Allocation Example: s > Allocation Allocation : λ * : ( max[ 0, min( FI,[ FI FI ])] ) Conges tion uplift from 1 from 1 Allocation Allocation 300 MW 900 MW 1,000 MW 200MW * λ 300MW * λ -100MW * λ 200MW * λ 0 Slide 17

18 Allocation Example: s with no Allocation Allocation : λ * : ( max[ 0, min( FI,[ FI FI ])] ) Conges tion uplift from 1 from 1 Allocation Allocation 100 MW 800 MW 1,000 MW -100MW * λ 100MW * λ -200MW * λ 0 0 Slide 18

19 Allocation Example: All s Allocation : λ * : ( max[ 0, min( FI,[ FI FI ])] ) Conges tion uplift from 1 from 1 Allocation Allocation 200 MW 1,100 MW 1,000 MW 300MW * λ 200MW * λ 100MW * λ 200MW * λ 100MW * λ Slide 19

Powerex EIM Implementation Informational Call. Mark Holman, Powerex Don Tretheway, California ISO October 3, 2017

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