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Nodal Settlement Delta Calculations and Statements

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- Objective: Describe the recommended design of nodal settlement delta calculations and statements.

- Zonal Settlement System produces excessive interval data of questionable value to ERCOT and Market Participants

Zonal Settlements System Architecture Stress Test Results

- Always produce 5 output interval cuts regardless of value
- PRICE, QUANTITY, AMOUNT, BILLAMT, BILLQTY
- Force PRICE X QUANTITY format

- Deltas (BILLQTY, BILLAMT) calculated at interval level
- Zero data calculated at interval level and calculated for deltas
- Statements repeat previous settlement data

- LARUAMT = (PCRUAMTew + PCOOMRUAMTew) / (RULRSOBew â€“ RUSAQew) * (RULRSOBqse â€“ RUSAQqse)
- LARUPRICE = (PCRUAMTew + PCOOMRUAMTew) / (RULRSOBew â€“ RUSAQew)
- LARUQTY = (RULRSOBqse â€“ RUSAQqse)
- LARUAMT = LARUPRICE * LARUQTY
- LARUBILLQTY = Current LARUQTY â€“ Previous LARUQTY
- LARUBILLAMT = Current LARUAMT â€“ Previous LARUAMT

First Settlement Run

Formula: D_AMT = (A + B) * C

Input Interval Cut A = 5,4,6,5,4

Input Interval Cut B = 0,0,0,0,0

Input Interval Cut C = 2,2,2,2,2

Forced PRICE*QTY -> D_QTY = A + B, D_PRICE = C

Output Interval Cut D_QTY = 5,4,6,5,4

Output Interval Cut D_PRICE = 2,2,2,2,2

Output Interval Cut D_AMT = 10,8,12,10,8

Total = 48

Output Interval Cut D_BILLQTY = 5,4,6,5,4

Output Interval Cut D_BILLAMT = 10,8,12,10,8

Total = 48

Second Settlement Run

Formula for D_AMT = (A + B) * C

Input Interval Cut A = 5,4,6,5,4

Input Interval Cut B = 1,1,1,1,1

Input Interval Cut C = 2,2,2,2,2

Forced PRICE*QTY -> D_QTY = A + B, D_PRICE = C

Output Interval Cut D_QTY = 6,5,7,6,5

Output Interval Cut D_PRICE = 2,2,2,2,2

Output Interval Cut D_AMT = 12,10,14,12,10

Total = 58

Output Interval Cut D_BILLQTY = 1,1,1,1,1

Output Interval Cut D_BILLAMT = 2,2,2,2,2

Total = 10

- Input interval cuts are restated as PRICE and QTY cuts
- Deltas (BILLQTY, BILLAMT) calculated at interval level (15min, hourly)
- Excessive interval data

- Zero data calculated at interval level and calculated for deltas
- High zero data overhead, excessive interval data

Increased number of charge and payment types to process

- 55 to 80 â†’More data

- Settlement Points, RUC â†’More data

- More data

______________________________________

= Differing Architectural Needs for Nodal Settlement and Billing System

- Simplify data requirements while still giving the Market what they need â€“ we need to be lean and efficient
- No PRICE and QTY cuts
- Inputs and Outputs specified in Nodal Protocols

- No BILLQTY delta cut
- Quantity cuts do not exist in Nodal Protocols so we will not create them nor the corresponding delta cut

- BILLAMT delta cut NOT at interval level
- BILLAMT calculated at Trade Date summary level

- Zero AMT output saved at Trade Date summary level unless non-zero values sum to zero
- No zero amount interval data when every interval is zero

- Statements will not repeat previous settlement data
- Statements roll up charges/payments to statement recipient level (even if charges/payments are at SPP or Resource Node level)
- All Input and Output data available in extracts

- No PRICE and QTY cuts

First Settlement Run

Formula: D_AMT = (A + B) * C

Input Interval Cut A = 5,4,6,5,4

Input Interval Cut B = 0,0,0,0,0

Input Interval Cut C = 2,2,2,2,2

Output Interval Cut D_AMT = 10,8,12,10,8

Total = 48

Output D_BILLAMT = 48

1st Statement

IntervalD_AMT

110

28

312

410

58

D_AMT Total = 48

D_BILLAMT = 48

Second Settlement Run

Formula: D_AMT = (A + B) * C

Input Interval Cut A = 5,4,6,5,4

Input Interval Cut B = 1,1,1,1,1

Input Interval Cut C = 2,2,2,2,2

Output Interval Cut D_AMT = 12,10,14,12,10

Total = 58

Output D_BILLAMT = 10

2nd Statement

IntervalD_AMT

112

210

314

412

510

D_AMT Total = 58

D_BILLAMT = 10

Third Settlement Run

Formula: D_AMT = (A + B) * C

Input Interval Cut A = 5,4,6,5,4

Input Interval Cut B = 1,1,1,1,1

Input Interval Cut C = 2,2,2,2,2

Output Interval Cut D_AMT = 12,10,14,12,10

Total = 58

Output D_BILLAMT = 0

3rd Statement

D_AMT Total = 58

D_BILLAMT = 0

First Settlement Run

Formula: D_AMT = (A + B) * C

Input Interval Cut A = 5,4,6,5,4

Input Interval Cut B = 1,1,1,1,1

Input Interval Cut C = 0,0,0,0,0

Output D_AMT = 0

Output D_BILLAMT = 0

1st Statement

D_AMT Total = 0

D_BILLAMT = 0

Second Settlement Run

Formula: D_AMT = (A + B) * C

Input Interval Cut A = 5,4,6,5,4

Input Interval Cut B = 1,1,1,1,1

Input Interval Cut C = 1,1,1,1,1

Output Interval Cut D_AMT = 6,5,7,6,5

Total = 29

Output D_BILLAMT = 29

2nd Statement

IntervalD_AMT

16

25

37

46

55

D_AMT Total = 29

D_BILLAMT = 29

First Settlement Run

Formula: D_AMT = (A + B) * C

Input Interval Cut A = 5,4,6,5,4

Input Interval Cut B = 1,1,1,1,1

Input Interval Cut C = 0,1,0,0,-1

Output Interval Cut D_AMT = 0,5,0,0,-5

Total = 0

Output D_BILLAMT = 0

1st Statement

IntervalD_AMT

10

25

30

40

5-5

D_AMT Total = 0

D_BILLAMT = 0

9.2.1Settlement Statement Process for the DAM

ERCOT shall produce daily Settlement Statements for the Day-Ahead Market (DAM), as defined in Section 9.2.2, Settlement Statements for the DAM, that show a breakdown of financial obligations between ERCOT and a Market Participant incurred in the DAM, including any administrative and miscellaneous charges applicable to the DAM.

9.2.2 Settlement Statements for the DAM

(7)Settlement Statements for the DAM must break fees down by Charge Types into the appropriate one-hour Settlement Interval for that type.

9.2.3DAM Settlement Charge Types

ERCOT shall provide, on each Settlement Statement, the dollar amount for each DAM Settlement charge and payment.

9.2.5DAM Resettlement Statement

(3)A DAM Resettlement Statement must reflect differences to financial records generated on the previous Settlement Statement for the given DAM.

9.5.1Settlement Statement Process for the Real-Time Market

ERCOT shall produce daily Settlement Statements for the Real-Time Market (RTM), as defined in Section 9.5.2, Settlement Statements for the RTM, that show a breakdown of Charge Types incurred in the RTM, including any administrative and miscellaneous charges applicable to the RTM.

9.5.2Settlement Statements for the RTM

(8)A Settlement Statement for the RTM must break the fees down by Charge Type into the appropriate 15-minute or one-hour Settlement Interval for that type.

9.5.3Real-Time Market Settlement Charge Types

ERCOT shall provide, on each RTM Settlement Statement, the dollar amount for each RTM Settlement charge and payment.

9.5.5RTM Final Statement

(2)An RTM Final Statement will reflect differences to financial records generated on the previous Settlement Statement for the given Operating Day

9.5.6RTM Resettlement Statement

(6)An RTM Resettlement Statement will reflect differences to financial records generated on the previous Settlement Statement for the given Operating Day.

9.5.8RTM True-Up Statement

(3)An RTM True-Up Statement will reflect differences to financial records generated on the previous Settlement Statement for the given Operating Day.