texas nodal © 2005 - 2006 electric reliability council of texas, inc. all rights reserved. 1 rt...

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 1 Texas Nodal

RT Energy Settlements

Mini Market Examples

Formulas

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 2 Texas Nodal

RT Payment for DC Tie imports Flow Diagram

Settlement System

Le

ve

l 1C

alc

ula

tion

Inp

ut

MMS

Real-Time Energy Payment for DC Tie

Import(RTDCIMPAMT)PR 6.6.3.4 (1)

Real-Time Settlement Point

Price (RTSPP)

Driver

Le

ve

l 2

Real-Time Energy Payment for DC Tie Import QSE Total(RTDCIMPAMT-

QSETOT)PR 6.6.3.4 (2)

Real-Time DC Import

(RTDCIMP)

Le

ve

l 3

Real-Time Energy Payment for DC Tie

Import Total(RTDCIMPAMTTOT)

PR 6.6.10 (2)

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 3 Texas Nodal

RT Payment for DC Tie imports

• RTDCIMPAMT = (-1) * RTSPP * (RTDCIMP * ¼ )

• Paid on scheduled volume

• Used to pay QSEs who bring energy onto the grid

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 4 Texas Nodal

RT DC Tie Charge for Exports under Oklaunion Exemption Flow Diagram

Settlement System

Level 1

Calcu

lation

Inp

ut

MMS

Real-Time DC Export Amount

(RTDCEXPAMT)PR 6.6.3.6 (1)

Real-Time Settlement Point

Price (RTSPP)

Driver

Level 2

Real-Time DC Export Amount QSE Total(RTDCEXPAMT-

QSETOT)PR 6.6.3.6 (2)

Real-Time DC Export

(RTDCEXP)

Level 3

Real-Time DC Export Amount Total

(RTDCEXPAMTTOT)PR 6.6.3.10 (2)

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 5 Texas Nodal

RT DC Tie Charge for Exports under Oklaunion Exemption

• RTDCEXPAMT = RTSPP * (RTDCEXP * ¼)

• Only used to charge exports that are using the Oklaunion Exemption

• Amounts should not exceed generation that supplies the load for Oklaunion

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 6 Texas Nodal

RT Payment for Block Load Transfers Flow Diagram

Settlement System

Level 1C

alculation Input

MMS

Block Load Transfer Resource Amount

(BLTRAMT)PR 6.6.3.5 (1)

Real-Time Settlement Point

Price (RTSPP)

Driver

Level 2

Block Load Transfer Resource Amount QSE

Total(BLTRAMTQSETOT)

PR 6.6.3.5 (2)

Block Load Transfer Resource

(BLTR)

Level 3

Block Load Transfer Resource Amount

Total(BLTRAMTTOT)

PR 6.6.10 (2)

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 7 Texas Nodal

RT Payment for Block Load Transfers

• BLTRAMT = (-1) * RTSPP * BLTR

• Used to pay QSEs who have BLT agreements for moving load to the region that is not under emergency conditions

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 8 Texas Nodal

RT Congestion Payment / Charge for Self-Schedules Flow Diagram

Settlement System

Level 1

Calcu

lation

Inp

ut

MMS

Real-Time Congestion Cost Amount(RTCCAMT)PR 6.6.4 (1)

Real-Time Settlement Point Price at Source

(RTSPP)

Driver

Level 2

Real-Time Congestion Cost Amount QSE

Total(RTCCAMTQSETOT)

PR 6.6.4 (1)

Self-Schedule Quantity(SSQ)

Level 3

Real-Time Congestion Cost Amount Total(RTCCAMTTOT)

PR 6.6.10 (2)

Real-Time Settlement Point

Price at Sink(RTSPP)

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 9 Texas Nodal

RT Congestion Payment / Charge for Self-Schedules

• RTCCAMT = (RTSPPsink – RTSPPsource) * (SSQ * ¼)

• Used to pay /charge QSE for moving power from one point to another

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 10 Texas Nodal

RT Energy Imbalance Flow Diagram

Settlement System

Le

ve

l 1C

alc

ula

tion

Inp

ut

Data Aggregation

Real-Time Energy Imbalance Amount for

a Resource Node(RTEIAMT)

PR 6.6.3.1 (2)

Le

ve

l 2

Real-Time Metered Generation

(RTMG)

MMS

Real-Time Energy Imbalance Amount for

a Load Zone(RTEIAMT)

PR 6.6.3.2 (2)

Real-Time Energy Imbalance Amount for

a Hub(RTEIAMT)

PR 6.6.3.3 (2)

Data Aggregation

Real-Time Adjusted Metered Load

(RTAML)

Real-Time Energy Imbalance Amount QSE Total

(RTEIAMTQSETOT)PR 6.6.3.1 (3), PR 6.6.3.2 (3),

PR 6.6.3.3 (3)

Le

ve

l 3

Real-Time Energy Imbalance Amount Total

(RTEIAMTTOT)PR 6.6.10 (2)

Real-Time Settlement Point

Price (RTSPP)

Self Schedules with Sink at Settlement

Point(SSSK)

Self Schedules with Source at

Settlement Point(SSSR)

Day-Ahead Energy Purchases

(DAEP)

Day-Ahead Energy Sales

(DAES)

Real-Time Energy QSE to QSE Purchases(RTQQEP)

Real-Time Energy QSE to QSE Sales

(RTQQES)

Driver

Driver

Driver

Driver

Driver

Driver

DriverDriver

Driver: Operating Day

Driver: RTEIAMT

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 11 Texas Nodal

RT Energy Imbalance

• RTEIAMT = (-1) * ∑ (GSPLITPER * NMSAMTTOT) + RTSPP * [(SSSK * ¼) + (DAEP * ¼) + (RTQQEP * ¼) – (SSSR * ¼) – (DAES * ¼) – (RTQQES * ¼) – RTAML + RTMGNM

• Used only when point is a Resource Node• Used only when point is a Load Zone • Sigma is the sum of the Resources for the

GSPLITPER values• Used to pay / charge a QSE for imbalances at all

points of scheduled activity

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 12 Texas Nodal

Base Point Deviation Flow Diagram

Calculate BPDAMT for Over and Under Generation and for IRR Generation

Resouces(PR 6.6.5.1.1, PR 6.6.5.1.2, PR 6.6.5.2)

Le

vel 1

Le

vel 2

Le

vel 3

Le

vel 4

Ca

lcula

tion

In

pu

t

Calculate BPDAMTQSETOT(PR 6.6.5.4)

RTSPPAABP

Settlement System

RTM EMS(LFC)

Calculation Driver

TWTG K1 K2 KIRR Q1 LRS

Calculation Driver

RTM MMS(SPP Engine)

Constants and Coeffecients

Q2 QIRR KP

Calculate BPDAMTTOT(PR 6.6.5.4)

Calculate LABPDAMT(PR 6.6.5.4)

Data Aggregation

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 13 Texas Nodal

Base Point Deviation (Over Generation)

• BPDAMT = MAX (0, RTSPP) * MAX [0, (TWTG – ¼ * MAX(((1 + 5%) * AABP), (AABP + 5 MW)))]

• Used to charge a QSE for over-generating, the greater of 5% or 5 MW is allowed as a tolerance

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 14 Texas Nodal

Base Point Deviation (Under Generation)

• BPDAMT = MAX (0, RTSPP) * MIN (1, KP) * MAX {0,{MIN [((1 – 5%) * ¼ (AABP)), ¼ * (AABP – 5 MW)] – TWTG}}

• Used to charge a QSE for under-generating, the greater of 5% or 5 MW allowed as a tolerance

• KP is a Settlement Point Price co-efficient. Currently value is 1.

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 15 Texas Nodal

Base Point Deviation for an IRR

• If AABP > HSL – 2 MW, then BPDAMT = 0

• Else, BPDAMT = MAX (0, RTSPP) * MAX (0, TWTG – (¼ * AABP) * ( 1 + 10%))

• Used to charge an Intermittent Renewable Resource for over-generation

• Base Point Deviation will be summed and appear as one Charge Type on Settlement Statement

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 16 Texas Nodal

Base Point Deviation - Exceptions

• Special rules for RMR (exempt, 6.6.5.3), QF (depends on existence of EOC, 6.6.5.3), DSR (various, 6.4.2.2)

• Other operational rules affect whether charge is valid for an interval or for a QSE (ex. Frequency, see 6.6.5.1)

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 17 Texas Nodal

Base Point Deviation Payment

• LABPDAMT = (-1) * BPDAMTTOT * LRS

• Used to allocate results of Base Point Deviation charges to QSEs with load

• This will most likely be a payment back to QSEs with load

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 18 Texas Nodal

RMR Charge Types Flow Diagram

Calculate RMRARF for RMR Resouces. FR7

(PR 6.6.6.1(3))

Level 1Level 2

Level 3Level 4

Calculation Input

Calculate RMRSBAMTQSETOTFR2

(PR 6.6.6.1(4))

RTSPP

RTM MMS

RMRAFLAG

RMRContract

MH

DATA AGGREGATION

Calculate RMRSBAMTTOTFR1

(PR 6.6.6.5)

Calculate LARMRAMTFR56

(PR 6.6.6.5)

RMR CONTRACTDATA

RTMG

RMRTCAP

Level 5

Calculate RMRHREAF for RMR Resouces. FR8

(PR 6.6.6.1(3))

RTMMMS

RMREH

Level 6

RMRCCAP

RMRTA

RMRTCAPA

Calculate RMRCRF for RMR Resouces. FR6

(PR 6.6.6.1(3))

RMRMNFC

Calculate RMRSBPR for RMR Resouces. FR5

(PR 6.6.6.1(3))

RMRIF

Calculate RMRSBAMT for RMR Resouces. FR3

(PR 6.6.6.1(2))

RMRMFCOST

RMRSUFQ

RMRHR

RMREAMT

Calculate RMRVCC for RMR Resouces. FR26

(PR 6.6.6.2(2))

Calculate RMREAMT for RMR Resouces. FR26

(PR 6.6.6.2(1))

FIP

RMRSUFLAG

RMRNPFLAG

RMRH

Calculate RMREAMTQSETOTFR25

(PR 6.6.6.2(3))

Calculate RMREAMTTOTFR24

(PR 6.6.6.5)

Calculate RMRNPAMT for RMR Resouces. FR49

(PR 6.6.6.4(1))

Calculate RMRNPAMTQSETOT FR48 (PR 6.6.6.4(2))

Calculate RMRNPAMT FR47

(PR 6.6.6.5)

Calculate RMRAAMT for RMR Resouces. FR40

(PR 6.6.6.3(2))

Calculate RMRAAMT FR39

(PR 6.6.6.5)

EMREAMT

RUCMWAMT

RUCCBAMT

RUCDCAMT

VSSEAMT

VSSVARAMT

PLATTS DAMMMS

RTSPPENGINE

DAESR

HLRS

H

RMRDAEREVTOT

RMRDAMMWREVTOT

Calculate DAESRTV FR58

(PR 6.6.6.5)

Calculate DAESRTVTTOT

FR57 (PR 6.6.6.5)

Settlement SystemCalculation Driver

RMRCEFA

STARTTYPE

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 19 Texas Nodal

RMR Standby Payments

• RMRSBAMT = (-1) * RMRSBPR• RMRSBPR = RMRMNFC / MH * (1 + RMRIF *

RMRCRF * RMRARF)• Used to pay QSE with an RMR agreement for non-

fuel costs for their RMR unit• RMRIF is the incentive factor for non-fuel costs.

Currently at 10%.• RMRCRF is the reduction factor if RMR unit does

not meet capacity requirements• RMRARF is the reduction factor if RMR unit does

not meet its availability requirements

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 20 Texas Nodal

RMR Payment for Energy

• RMREAMT = (-1) * [((FIP + RMRCEFA) * RMRSUFQ / RMRH) * RMRSUFLAG + ∑ (((FIP + RMRCEFA) * RMRHR + RMRVCC) * RTMG)]

• Used to pay QSE with RMR agreement for energy needed to run unit

• Sigma used to sum intervals for RMRHR and RTMG

• RMRVCC = (RMRMFCOST + ∑ RMREAMT ) / ∑ RTMG

• Sigma used for summing all hours for RMREAMT, and for all intervals for RTMG

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 21 Texas Nodal

RMR Payment for Energy (cont)

• FIP is the Fuel Index Price for Natural Gas• RMRCEFA is the Fuel Adder used for

incorporating the transportation of natural gas to unit

• RMRVCC is the variable cost component used to adjust to the actual fuel costs of the unit

• RMREAMT in the RMRVCC formula is used to back out the payment made to the QSE for the unit from the previous Settlement Statement.

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 22 Texas Nodal

RMR Adjustment Charge

• RMRAAMT = (-1) * ∑ ∑ ( ∑ (RTMG * RTSPP) + ∑ EMREAMT + RUCMWAMT + RUCCBAMT + RUCDCAMT + ∑ VSSVARAMT + ∑ VSSEAMT)

• Used to charge back to the QSE with an RMR agreement all payments for other services for that unit

• Sigmas inside outermost parenthesis are to sum for intervals

• First sigma is to sum for all Resource Nodes and second sigma is to sum for all Resources

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 23 Texas Nodal

RMR Charge for Unexcused Conduct

• RMRNPAMT = $10,000 * RMRNPFLAG

• Used to charge QSE with RMR agreement for an unexcused conduct event on a daily basis

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 24 Texas Nodal

RMR Service Charge

• LARMRAMT = (-1) * (RMRSBAMTTOT - ∑ RMRDAESRTVTOT + RMREAMTTOT + RMRAAMTTOT – (RMRDAEREVTOT + RMRDAMWREVTOT) + RMRNPAMTTOT / H) * HLRS

• Used to allocate to QSEs with load the costs of the RMR service

• Includes payments from the Day-Ahead Market that are NOT paid to the QSE for the RMR units

• This is an hourly charge

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 25 Texas Nodal

Voltage Support Service

• An Ancillary Service that is required to maintain transmission and distribution voltages on the ERCOT Transmission Grid within acceptable limits.

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 26 Texas Nodal

Voltage Support Service Flow Diagram

Calculate VSSVARAMT for Generation Resouces. FR2, FR4

(PR 6.6.7(2)(a))

Level 1Level 2

Level 3Level 4

Calculation

Input

Calculate VSSEAMTQSETOTFR39

(PR 6.6.7.1(3))

RTSPP

URLEAD

RTM MMS

VSSVARIOL VSSVARPR RTVSSAIECLRS

Calculation Driver

RTM MMS(SPP Engine)

Calculate VSSEAMTTOTFR31

(PR 6.6.7.2)

Calculate LAVSSAMTFR29

(PR 6.6.7.2)

Data Aggregation

RTVAR RTMG

URLAG

RTHSLAIEC

Settlement SystemAIEC Calculation Engine

Calculate RTICHSL Generation Resouces. FR16

(To Be Added to Nodal Protocols)

Level 5

Calculate VSSVARLAG for Generation Resouces.

FR3(PR 6.6.7(2)(a))

Calculate VSSVARLEAD for Generation Resouces.

FR5(PR 6.6.7(2)(a))

RTM MMS

LSL

HSL

Calculate VSSEAMT for Generation Resouces. FR15(PR 6.6.7(2)(b))

Settlement System

Calculate VSSVARAMTQSETOTFR38

(PR 6.6.7.1(3))

Calculate VSSVARAMTTOTFR30

(PR 6.6.7.2)

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 27 Texas Nodal

Voltage Support Service Payments (Lag)

• VSSVARAMT = (-1) * VSSVARPR * VSSVARLAG• Used to pay a QSE providing Lagging Voltage

Support• VSSVARLAG = MAX[0, MIN( ¼ * VSSVARIOL,

RTVAR) – ( ¼ * (HSL * 0.32868))]• Used to take the lesser of the instruction or the

lagging voltage provided and compare to voltage being provided

• VSSVARPR is $50.00 / installed kvar or $2.65 for MVar

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 28 Texas Nodal

Voltage Support Service Payments (Lead)

• VSSVARAMT = (-1) * VSSVARPR * VSSVARLEAD• Used to pay a QSE providing Leading Voltage

Support• VSSVARLEAD = MAX{0, [ ¼ * (HSL * 0.32868 * (-

1)) – MAX(( ¼ * VSSVARIOL), RTVAR)]}• Used to take the lesser of the instruction or the

lagging voltage provided and compare to voltage being provided

• VSSVARPR is $50.00 / installed kvar or $2.65 for MVar

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 29 Texas Nodal

Lost Opportunity Payment

• VSSEAMT = (-1) * MAX(0, RTSPP * MAX( 0, ( HSL * ¼ - RTMG)) – ( RTICHSL – RTVSSAIEC * ( RTMG – LSL * ¼ )))

• Used to pay a QSE who provides ERCOT-directed voltage support in lieu of energy

• Used to calculate the back-out amount to result in the lost energy amount

• RTICHSL = RTHSLAIEC * ( ¼ * HSL – ¼ * LSL)• Used to calculate the whole amount of dollars

available over the expanse of the operating capability

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 30 Texas Nodal

Lost Opportunity Payment Diagram

• Lost opportunity Payment

LSL HSL RTMG

$/MWh

MW

Energy Offer Curve

RTSPP * (HSL – RTMG)

VSSEAMT Lost Opportunity Cost

RTVSSAIEC * (RTMG – LSL)

RTICHSL – (RTVSSAIEC * (RTMG – LSL))

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 31 Texas Nodal

Voltage Support Charge

• LAVSSAMT = (-1) * ( VSSVARAMTTOT + VSSEAMTTOT) * LRS

• Used to allocate the payments for voltage support to the QSEs with load

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 32 Texas Nodal

Black Start Service Flow Diagram

Level 1Level 2

Level 3Level 4

Level 5

`

Calculation

Input

Calculate BSSHREAF

Settlement System Creates BBSEH from Black Start Service Contract Agreements

Settlement System

RTM MMSBlack Start Service

Calculation Driver

BSSAFLAG

Calculate BSSARF

Settlement System Retrieves BSSPR from Black Start Service Contract Aggreements

Calculate BSSAMTPR 6.6.8.1 (2)

FR3

Calculate BSSAMTQSETOTPR 6.6.8.1 (3)

FR2

Calculate BSSAMTTOTPR 6.6.8.2

FR1

Level 6

Calculate LABSSAMTPR 6.6.8.2

FR18

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 33 Texas Nodal

Black Start Capacity Payment

• BSSAMT = (-1) * BSSPR * BSSARF

• Used to pay QSEs with Black Start agreements for their readiness to supply the service

• BSSARF is the availability reduction factor based on the availability of the unit throughout the year

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 34 Texas Nodal

Black Start Capacity Charge

• LABSSAMT = (-1) * BSSAMTTOT * HLRS

• Used to allocate the payments for Black Start to the QSEs who have load

• This is an hourly charge

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 35 Texas Nodal

Emergency Energy Flow Diagram

Settlement System

Level 1C

alculation Input

Data Aggregation

Level 2

Real-Time Metered Generation

(RTMG)

EMS (LFC)

Emergency Energy(EMRE)

MMS

Level 3

Real-Time Settlement Point

Price (RTSPP)

Aggregated Emergency Base

Point (AEBP)

Driver

Emergency Base Point Weighted Average Price(EBPWAPR)

Base Point(BP)

Emergency Energy Price

(EMREPR)

Emergency Energy Amount

(EMREAMT)PR 6.6.9.1 (1)

Emergency Energy Amount QSE Total

(EMREAMTQSETOT)PR 6.6.9.1 (2)

Level 4

Emergency Energy Amount Total

(EMREAMTTOT)PR 6.6.9.2

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 36 Texas Nodal

Payment for Emergency Power Increase Directed by ERCOT

• EMREAMT = (-1) * EMREPR * EMRE• Used to pay QSEs who respond to emergency

power requests from ERCOT• EMREPR = MAX (0, EBPWAPR – RTSPP)• Used to calculate the difference between the

Emergency Price and the Real Time Price• EMRE = MAX (0, MIN(AEBP, RTMG) – ¼ * BP• Used to calculate the lesser of the requested or

supplied increase and comparing that to the non-emergency base point

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 37 Texas Nodal

Charge for Emergency Power Increases

• LAEMREAMT = (-1) * EMREAMTTOT * LRS

• Used to allocate payments to QSEs who supply emergency energy to QSEs who have load

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 38 Texas Nodal

Real Time Revenue Neutrality Allocation

Settlement System

Level 1Calculation Input

Settlement System

Load Allocated Real-Time Revenue

Neutrality(LARTRNAMT)PR 6.6.10 (2)

Real-Time DC Import Amount

Total(RTDCIMPAMT-

TOT)

Real-Time DC Export Amount

Total(RTDCEXPAMT-

TOT)

Real-Time Energy Congestion Cost

Amount (RTCCAMTTOT)

RMR Day-Ahead Energy Revenue Sale RT Value

(RMRDAESRV-TOT)

Real-Time Obligation Amount

Total(RTOBLAMTTOT)

Real-Time Option Amount Total

(RTOPTAMTTOT)

Block Load Transfer Resource

Amount(BLTRAMTTOT)

Real-Time Energy Imbalance Amount

Total(RTEIAMTTOT)

Real-Time Option with Refund

Amount Total(RTOPTRAMTTOT)

Load Ratio Share(LRS)

Driver

Real-Time Energy Imbalance Amount

Total(RTEIAMTTOT)

Real-Time DC Export Amount

Total(RTDCEXPAMT-

TOT)

RMR Day-Ahead Energy Revenue Sale RT Value

(RMRDAESRV-TOT)

Real-Time DC Import Amount

Total(RTDCIMPAMT-

TOT)

Real-Time Energy Congestion Cost

Amount (RTCCAMTTOT)

Block Load Transfer Resource

Amount(BLTRAMTTOT)

Real-Time Obligation Amount

Total(NDRTOBLAMTTO

T)

Load Ratio Share(LRS)

Driver

Real-Time Option with Refund

Amount Total(NDRTOPTRAMTT

OT)

Real-Time Option Amount Total

(NDRTOBLRAMTTOT)

Real-Time Option Amount Total

(NDRTOBLAMTTOT)

Real-Time Flow Gate Right Amount

Total(NDRTFGRAMTTO

T)

No Day Ahead Market

(NODAMFLAG)

Driver

No Day Ahead Market

(NODAMFLAG)

Driver

Settlement System

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 39 Texas Nodal

Real Time Revenue Neutrality Allocation

• If the Day-Ahead Market Executes:• LARTRNAMT = (-1) * ( RTEIAMTTOT +

BLTRAMTTOT + RTDCIMPAMTTOT + RTDCEXPAMTTOT + RTCCAMTTOT + RMRDAESRTVTOT + RTOBLAMTTOT * ¼ + RTOPTAMTTOT * ¼ + RTOPTRAMTTOT * ¼ ) * LRS

• Used to allocate all unallocated amounts to QSE with load

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 40 Texas Nodal

Real Time Revenue Neutrality Allocation

• If the Day-Ahead Market does not execute:• LARTRNAMT = (-1) * ( RTEIAMTTOT +

BLTRAMTTOT + RTDCIMPAMTTOT + RTDCEXPAMTTOT + RTCCAMTTOT + RMRDAESRTVTOT + NDRTOBLAMTTOT * ¼ + NDRTOPTAMTTOT * ¼ + NDRTOPTRAMTTOT * ¼ + NDRTOBLRAMTTOT * ¼ + NDRTFGRAMTTOT * ¼ ) * LRS

• Used to allocate all unallocated amounts to QSEs with load

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 41 Texas Nodal

ERCOT Administration Fee

Settlement System

Level 1

Calcu

lation

Inp

ut

Data Aggregation

Real-Time Adjusted Metered Load

(RTAML)

Driver

Settlement System

ERCOT System Administration

Charge(ESACAMT)PR 9.16.1

Load Administration Fee Factor

(LAFF)

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 42 Texas Nodal

ERCOT Administration Fee

• ESCAMT = LAFF * ∑ RTAML

• Fee charged to cover ERCOT expenses

• Sigma is the sum over all settlement points for a QSE

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 43 Texas Nodal

RT Energy Settlements

• Questions

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 44 Texas Nodal

RMRSBAMT – CRF!

• If (RMRTCAPA + RMRTCAP) ≥ RMRCCAP

• Then RMRCRF = 1

• Otherwise

• RMRCRF = Max [0, 1 – 2 *

• (RMRCCAP – RMRTCAP) / RMRCCAP]

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 45 Texas Nodal

RMRSBAMT – ARF!

• If (RMRHREAF RMRTA) then RMRARF = 1• Otherwise,• RMRARF = Max [0, 1 – (RMRTA – RHREAF) *

2]

• If (RMREH < 4380) then RMRHREAF = 1• Otherwise,

• RMRHREAF =∑(RMRAFLAG) / 4380

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 46 Texas Nodal

Net Metering Agreement Examples

SP

PL1

NMC 1Percentage MW Price NMSAMTTOT

PL1 100% 20 $50.00 $1,000.00

Net Metering Agreement 1Single Resource

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 47 Texas Nodal

Net Metering Agreement Examples

SP

PL1 PL3PL2

NMC 2 Resource OnlyPercentage MW Price NMSAMTTOT

PL1 33.3% 20 $50.00 $3,325.00PL2 25.0% 15 $55.00PL3 41.7% 25 $60.00

Total: 60

Net Metering Agreement 2Resource Only

© 2005 - 2006 Electric Reliability Council of Texas, Inc.  All rights reserved. 48 Texas Nodal

Net Metering Agreement Examples

PL4

SP

PL1 PL3PL2

Net Metering Agreement 3Load and Resource

NMC 3 Resource and Load for GSPLITPER For NMSAMTTOTPercentage MW MW Price NMSAMTTOT

PL1 30.8% 16 20 $50.00 $2,688.00PL2 0.0% 0 -5 $47.00PL3 69.2% 36 40 $51.00PL4 0.0% 0 -3 $39.00

Total: 52 52