Http://nodal.ercot.com 1 COMS/Settlements/Credit Weekly Update August 20, 2010.

http://nodal.ercot.com 1

COMS/Settlements/Credit

Weekly Update

August 20, 2010


Antitrust Admonition

ANTITRUST ADMONITION

ERCOT strictly prohibits Market Participants and their employees who are participating in ERCOT activities from using their participation in ERCOT activities as a forum for engaging in practices or communications that violate the antitrust laws. The ERCOT Board has approved guidelines for members of ERCOT Committees, Subcommittees and Working Groups to be reviewed and followed by each Market Participant attending ERCOT meetings. If you have not received a copy of these Guidelines, copies are available at the Client Relations desk. Please remember your ongoing obligation to comply with all applicable laws, including the antitrust laws.

DISCLAIMER

All presentations and materials submitted by Market Participants or any other Entity to ERCOT staff for this meeting are received and posted with the acknowledgement that the information will be considered public in accordance with the ERCOT Websites Content Management Operating Procedure.


Agenda

• Anti-trust Admonition

• Settlements Standing Reports and Updates– Operating Day Settlement Reports– Week in Review/General Reminders– Next Week’s Activities

• Settlements Environment Report– Known Issues

• Credit

• Question and Answers / General Discussion

ERCOT asks that Market Participants log into the WebEx session using their company name and then their name. This will allow ERCOT to take roll-call offline


DAM Settlement Overview for August 12

Statement and Invoice Overview

• 172 Statements/Invoices posted to QSEs

• 62 Statements/Invoices posted to CRRAHs

• 0 QSEs received Statements/Invoices for $0

CRR Overview

• CRRs were not derated

• There were no CRR Shortfall Charges

General Reminders/Updates

• Submit any questions/issues about statements, invoices, extracts or calculations to [email protected]

Day Ahead Energy Sales -$83,558,441.55Day Ahead Energy Purchases $209,775,979.10PTP Obligation Bought in the DAM $39,756,378.45Day Ahead Congestion Rent $165,685,870.02

Day Ahead Make Whole Payments -$330,822.13Day Ahead Make Whole Charge $330,822.01

Non-Spin Reserve Payment -$999,058.34Non-Spin Service Charge $999,058.41

Regulation Down Payment -$51,681.82Regulation Down Charge $51,681.98Responsive Reserve Payment -$1,351,720.96Responsive Reserve Charge $1,351,720.86Regulation Up Payment -$590,138.93Regulation Up Charge $590,138.93

Day Ahead Obligation -$42,303,328.31Day Ahead Obligation with Refunds $0.00

Day Ahead Option -$31,693,595.99Day Ahead Option with Refunds -$745,775.91Short Fall Charges to CRR Owners $0.00Balancing Account Credit $90,943,169.81

Day Ahead Ancillary Services

Day Ahead CRR

Operating Date 08/12/2010 DAM Settlement Totals

Day Ahead Energy

Day Ahead Make Whole







CRR Overview












Day Ahead CRR


Day Ahead Energy








CRR Overview


• There were CRR Shortfall Charges






Regulation Down Payment -$104,259.17Regulation Down Charge $104,259.22Responsive Reserve Payment -$942,058.01Responsive Reserve Charge $942,057.98Regulation Up Payment -$434,478.36Regulation Up Charge $434,478.36


Day Ahead Option -$1,700,252.56Day Ahead Option with Refunds $0.00Short Fall Charges to CRR Owners $42,426.65Balancing Account Credit $3,679,801.33


Day Ahead CRR


Day Ahead Energy








CRR Overview

• CRRs were derated





Day Ahead Make Whole Payments $0.00Day Ahead Make Whole Charge $0.00

Non-Spin Reserve Payment -$1,015,253.63Non-Spin Service Charge $1,015,253.60





Day Ahead CRR


Day Ahead Energy








CRR Overview






Day Ahead Make Whole Payments $0.00Day Ahead Make Whole Charge $0.00


Regulation Down Payment -$57,377.81Regulation Down Charge $57,377.81Responsive Reserve Payment -$827,584.76Responsive Reserve Charge $827,584.72Regulation Up Payment -$345,342.67Regulation Up Charge $345,342.71




Day Ahead CRR


Day Ahead Energy








CRR Overview

• CRRs were derated











Day Ahead CRR


Day Ahead Energy



RTM Settlement Overview for August 4

Statement Overview

• 205 Statements posted to QSEs

• 4 Statements posted to CRRAHs

• 5 QSEs received Statements for $0

General Reminders


Real-Time Energy Imbalance $5,427,351.61

Block Load Transfer Resource $0.00

Real-Time DCTIE import -$1,944,063.91

Real-Time DCTIE export $252,872.45

Real-Time Congestion Payment or Charge $175,095.27

Real-Time PTP Obligation -$371,686.50

Real-Time Revenue Neutrality Allocation -$3,494,399.03

Base Point Deviation Charge $1,203,806.81

Base-Point Deviation Payment -$1,203,807.13

Real-Time Option w ith Refund -$1,973.32

Real-Time Option -$108,679.74

Real-Time CRR Ow ners Shortfall Charges $58,119.89

Black Start Service Payment -$13,129.03

Black Start Service Charge $13,129.13

RMR STANDBY -$37,351.62

RMR ENERGY -$340,241.21

RMR Adjustment Charge $527,449.73

RMR Day-Ahead energy Sale Real-Time Value Market Total $65,483.30

Day-Ahead energy revenues total for RMR units -$15,675.20

RMR Unexcused Misconduct Charge $0.00

RMR Service Charge -$100,048.75

RUC Claw back Charge $2,426,343.14

RUC Claw back Payment -$2,426,343.43

RUC Decommitment Payment $0.00

RUC Decommitment Charge $0.00

RUC Make-Whole Payment -$20,994.04

RUC Capacity-Short $20,992.56

RUC Make-Whole Uplift Charge $0.86

ERCOT System Administration Charge $505,300.14

QSE Nodal Surcharge Fee $454,519.51

RUC

Administrative Fees

Black Start

RMR

Real-Time CRR

Operating Date 08/04/2010 RTM Settlement Totals

Real Time Energy

Base Point Deviation



Statement Overview




General Reminders







Real-Time PTP Obligation $132,368.83

Real-Time Revenue Neutrality Allocation -$550,718.14



Real-Time Option w ith Refund $0.00

Real-Time Option -$151,760.89

Real-Time CRR Ow ners Shortfall Charges $0.00




RMR ENERGY -$275,395.81


RMR Day-Ahead energy Sale Real-Time Value Market Total $1,716,758.80



RMR Service Charge $1,146,666.72










RUC

Administrative Fees

Black Start

RMR

Real-Time CRR


Real Time Energy




Statement Overview




General Reminders






Real-Time Congestion Payment or Charge -$22,685.37

Real-Time PTP Obligation $0.00

Real-Time Revenue Neutrality Allocation -$126,762.89



No DAM Real-Time Option w ith Refund -$2,871.44

No DAM Real-Time Option -$1,535,442.75

No DAM Real-Time Obligation -$1,449,275.76

No DAM Real-TIme Obligation w ith Refund $0.00



RMR Standby Payment -$37,373.70

RMR Energy Payment -$120,745.43













RUC

Administrative Fees

Black Start

RMR

Real-Time CRR


Real Time Energy




Statement Overview




General Reminders




Real-Time DCTIE import -$700,776.95



Real-Time PTP Obligation $0.00




No DAM Real-TIme Obligation w ith Refund $0.00

No DAM Real-Time Option w ith Refund -$1,130.14

No DAM Real-Time Option -$771,586.12

No DAM Real-Time Obligation -$1,114,489.96



RMR Standby Payment -$37,384.75

RMR Energy Payment -$121,048.50




RUC Claw back Charge $0.00

RUC Claw back Payment $0.00



RUC Make-Whole Payment $0.00

RUC Capacity-Short $0.00




RUC

Administrative Fees

Black Start

RMR

Real-Time CRR


Real Time Energy




Statement Overview




General Reminders





Real-Time DCTIE export $3,187,949.84

Real-Time Congestion Payment or Charge $1,215,958.00


Real-Time PTP Obligation -$878,908.92




Real-Time Option w ith Refund $0.00

Real-Time Option $0.00

Real-Time CRR Ow ners Shortfall Charges $0.00




RMR ENERGY -$351,012.02

RMR Adjustment Charge $12,100,516.08




RMR Service Charge $3,774,900.63

SASM Reg Dow n Payment -$773.08

Reg Dow n Failure to Provide Charge $0.00

Real Time Reg Dow n Adjustment Charge $773.07

SASM Non-Spin Payment -$21.66

Non-Spin Failure to Provide Charge $0.00

Real Time Non-Spin Adjustment Charge $21.61

SASM Reg Up Payment -$52,534.22

Reg Up Failure to Provide Charge $0.00

Real Time Reg-Up Adjustment Charge $52,534.16

SASM Responsive Reserve Payment -$100,728.91

Responsive Reserve Failure to Provide Charge $0.00

Real Time Responsive Reserve Adjustment Charge $100,728.98





RUC Make-Whole Payment $0.00

RUC Capacity-Short $0.00

RUC Make-Whole Uplif t Charge $0.00



RUC

Administrative Fees

Black Start

RMR

Real-Time Ancillary Services

Real-Time CRR


Real Time Energy


Charge Type Tracker

• Below are the Day Ahead Market charge types that have been executed at least once during Market Trials (18 of 19 executed)


Day Ahead Charge Type Executed in Market TrialsDay Ahead Obligation with Refunds NoShort Fall Charges to CRR Owners YesBalancing Account Credit YesDay Ahead Energy Purchases YesDay Ahead Energy Sales YesDay Ahead Make Whole Charge YesDay Ahead Make Whole Payments YesDay Ahead Obligation YesDay Ahead Option YesDay Ahead Option with Refunds YesNon-Spin Reserve Payment YesNon-Spin Service Charge YesPTP Obligation Bought in the DAM YesRegulation Down Charge YesRegulation Down Payment YesRegulation Up Charge YesRegulation Up Payment YesResponsive Reserve Charge YesResponsive Reserve Payment Yes

Charge Type Tracker


• All Real-Time Market charge types have been executed at least once during Market Trials (45 of 45 executed)

Real Time Charge Type Executed in Market Trials Real Time Charge Type Executed in Market TrialsBlock Load Transfer Resource Yes Black Start Service Charge YesCharge for Emergency Energy Yes Black Start Service Payment YesEmergency Energy Payment Yes ERCOT System Administration Charge YesReal-Time CRR Ow ners Shortfall Charges Yes Non-Spin Failure to Provide Charge YesReal-Time DCTIE export Yes QSE Nodal Surcharge Fee YesReal-Time Load Allocated Voltage Charge Yes Real Time Non-Spin Adjustment Charge YesRMR Unexcused Misconduct Charge Yes Real Time Reg Dow n Adjustment Charge YesRUC Decommitment Charge Yes Real Time Reg-Up Adjustment Charge YesRUC Decommitment Payment Yes Real Time Responsive Reserve Adjustment Charge YesVoltage Support Service Energy Payment Yes Reg Dow n Failure to Provide Charge YesVoltage Support Service Var Payment Yes Reg Up Failure to Provide Charge YesBase Point Deviation Charge Yes Responsive Reserve Failure to Provide Charge YesBase-Point Deviation Payment Yes RMR Service Charge YesReal-Time Congestion Payment or Charge Yes RUC Capacity-Short YesReal-Time DCTIE import Yes RUC Claw back Charge YesReal-Time Energy Imbalance Yes RUC Claw back Payment YesReal-Time Option Yes RUC Make-Whole Payment YesReal-Time Option w ith Refund Yes RUC Make-Whole Uplif t Charge YesReal-Time PTP Obligation Yes SASM Non-Spin Payment YesReal-Time Revenue Neutrality Allocation Yes SASM Reg Dow n Payment YesRMR Adjustment Charge Yes SASM Reg Up Payment YesRMR Energy Payment Yes SASM Responsive Reserve Payment YesRMR Standby Payment Yes

Week in Review

• RTM Invoices (Posted 8-19)– RTM Initials 7/30, 7/31, 8/1, 8/2, 8/3, 8/4, 8/5– RTM Finals 7/20, 7/21, 7/22, 7/23, 7/24– RTM True-ups 6/22, 6/23, 6/24, 6/25, 6/26

• EILS Settlement completed with the 7-31 Final• 8-18 RTSPPs for Interval Ending 01:00 are all zero. Once the price

corrections are posted, we’ll be performing a DAM Resettlement before we run the 8-18 Initial



Next Week’s Activities

• Operating Days for next week that will be settled – 8-24 though 8-28 (DAM and RTM)

• 40 hour LFC Test will take place on 8-26 through 8-28• RUC Simulation

– If you want to receive a RUC Commitment or Decommitment to coincide with a Zonal self commitment or RPRS commitment, send the request to [email protected]

• 6-17 Re-Settlement (So EMRE bill determinant will be published)

Environment Report-Known Issues

COMS New Known Issues• If a QSE self-commits more than one combined cycle configuration for the same hour and

then a later RUC process runs to commit the configuration with the lower HSL, the self commit flag will not be generated correctly (Incorrect SELFCOMMITFLAG)

• If a resource comes online at exactly 1 minute before the end of an hour (XX:59:00) the flag that determines Energy Eligibility in the DAM Make-Whole payment will not be generated correctly (Incorrect DAMWENEFLAG)

COMS Closed Issues• No new closed issues

Reminder: ERCOT will post known issues every Friday to the readiness center at: http://nodal.ercot.com/readiness/markettrials/coms/index.html


EILS Settlements


• Utilized EILS Feb 2010 – May 2010 contract• QSEs 7/31 RTM Final Statements contain EILS Payment and Charge line

items (in the Real-Time Energy section)• QSEs should verify that charge types are displayed on their statement and

that data elements defined below are in their RTM settlement extracts.

Data Provided Protocol Equivalent Zonal Equivalent Comment

EILPAMT q(tp) QSE_EILqc(tp)•MISC_CREDIT_EILS_B1_061010_PAYMENT_TO_CREDIT_CH4•MISC_CREDIT_EILS_B2_061010_PAYMENT_TO_CREDIT_CH4•MISC_CREDIT_EILS_B3_061010_PAYMENT_TO_CREDIT_CH4•MISC_CREDIT_EILS_NB_061010_PAYMENT_TO_CREDIT_CH4

EILS Capacity PaymentBy QSE and Time PeriodScalar (no interval breakdown)In RTM CODE

EILCAMT q(tp) LAEIL qc(tp) •MISC_DEBIT_EILS_B1_061010_PAYMENT_TO_DEBIT_CH4•MISC_DEBIT_EILS_B2_061010_PAYMENT_TO_DEBIT_CH4•MISC_DEBIT_EILS_B3_061010_PAYMENT_TO_DEBIT_CH4•MISC_DEBIT_EILS_NB_061010_PAYMENT_TO_DEBIT_CH4

EILS Capacity Charge By QSE and Time PeriodScalar (no interval breakdown)In RTM CODE

EILPAMTQSETOT q n/a (∑c(tp) QSE_EILqc(tp)) n/a EILS Payment Amount per QSE Value on StatementScalar In RTM CODE

EILPAMTTOT n/a (∑qc(tp) QSE_EILqc(tp)) n/a EILS Payments Total by Time PeriodScalarIn RTM MODE

EILSLTOT(tp) n/a n/a Total Load by Time Period ScalarIn RTM MODE

EILCAMTQSETOTq n/a (∑c(tp)LAEIL qc(tp)) n/a EILS Charge Amount per QSE Value on StatementScalar In RTM CODE

Settlements FAQs


• Q: How is ERCOT going to handle intervals where TWTG is missing• A: ERCOT has put into place a process to flag intervals where TWTG

is missing for all resources for a settlement interval. A manual correction will be made to replace the data.

• Q: When will the Settlements Disputes API be available?• A: The Nodal Disputes API will be available next week for QSEs to

submit disputes. If you’d like to test the Disputes API, please send a message to your ERCOT Client Manager with the request to test. A Market Notice will be sent out next week with additional details. Please continue, however, to send any issues to [email protected]. Nodal disputes will NOT be used for Market Trials issue tracking.

Open Forum

Any Questions???


Market Trials - Friday call

Credit and Treasury

Weekly Update

August 20, 2010

Week in Review

• Core credit – CMM

• Posted Credit Reports and sent ACLs each business day

– AIL Report • Data lags occurred on 8/17 and 8/18 as a result of the weekend failover (the lag

is now cleared)


Week in Review

• Core credit – CMM

• Credit exposures

– Credit exposures reflect market participant activity in Market Trials• There remain a few exceptions, which are listed on the Known Issues list • Several adjustments continue to be made for Market Trials as a result of

extreme data experienced– The ADTE component of the EAL continues to be adjusted to reflect

recent Zonal activity » While this establishes a more moderate level of exposure, it may not

be predictive and will not alleviate the impact of unusual RT activity on the AIL Component

» The adjustment will remain in effect through September 3rd unless a CP requests a different ADTE

– AIL exposures continue to be adjusted as follows:» For completed and not settled days, exposure is reduced by 50% » For forward days, exposure was reduced by 80%» The adjustment will remain in effect through September 3rd

unless a CP requests a different ADTE


Week in Review

– For a CP to get a good idea of how credit will work in Nodal, they should try to operate (as much as possible) as they intend to in Nodal (including using Energy Trades along with DAM, etc)

– ERCOT will work with CPs to further adjust their ADTE to reflect projected activity as needed


Week in Review

DAM Credit Constraint

• “e” Factors

– “e” Factor changes went into effect on Friday, August 20th for the DAM run for operating day Saturday, August 21th

• Email notification sent one day late on August 19 • Only one entity requested specific ‘e1’ and ‘e2’ • The biweekly reset was based on CP data

– New known issue – ERCOT has identified an error in the “e2” Factor calculation.

• The “e2” factor calculation is using energy only offer volumes when it should use energy bid volumes. Issue is fixed and pending migration.

• The “e1” calculation is correct.

– NPRR 206 and “e” factors training materials are posted @ http://nodal.ercot.com/training/courses/nprr206_workshop.html


Week in Review

DAM Credit Constraint - Adjustment of ACL on Non-Business days– On Non-Business days, MMS reduces the latest ACL by the following each day until a

new ACL is received from credit.• Energy-only offers

– ACL is reduced by the product of the cleared quantity of the offer times the 95th percentile of the hourly difference of the Real-Time Settlement Point Price and Day-Ahead Settlement Point Price over the previous 30 days for the hour.

• Energy bids– ACL is reduced by the product of the cleared bid quantity multiplied by the cleared bid price.

• Three part energy offers– ACL is reduced by the product of the cleared quantity of the offer times the 95th

percentile of the hourly difference of the Real-Time Settlement Point Price and Day-Ahead Settlement Point Price over the previous 30 days for the hour.

• PTP Obligation bids– For each cleared PTP Obligation Bid, the ACL is reduced by the cleared bid quantity

multiplied by the sum of the cleared bid price, if positive, plus the 95th percentile of the hourly positive price difference between the source Real-Time Settlement Point Price minus the sink Real-Time Settlement Point Price over the previous 30 days for the hour.

• Procured AS– For procured Ancillary Services, the ACL is reduced by the product of the cleared quantity of

Ancillary Service not self-arranged times the hourly MCPC for that Ancillary Service for that hour.

NOTE: Above slide is from the DAM slide deck


Week in Review


Operating Date Primary Activity

Total Generation Total Load Self Scheduled Q2Q Purchases Q2Q Sales DAM Purchases DAM Sales

Imbalance Volume

8/3/2010 No Load, No Gen 0 0 0 24,045 24,800 4,785 1,884 -2,1468/3/2010 Primarily Gen 820,802 557,900 0 239,308 216,274 581,047 416,572 -449,2238/3/2010 Primarily Load 349,222 625,061 0 130,889 153,168 51,431 218,805 465,492

1,170,025 1,182,961 0 394,242 394,242 637,263 637,261 14,124

8/4/2010 No Load, No Gen 0 0 0 10,000 20,950 9,258 1,615 3,3078/4/2010 Primarily Gen 601,392 343,388 0 196,930 175,391 386,782 270,340 -395,9868/4/2010 Primarily Load 596,814 868,072 0 111,727 122,316 165,034 288,641 405,454

1,198,206 1,211,460 0 318,658 318,658 561,075 560,596 12,775


1,195,783 1,206,698 0 549,934 549,934 789,255 785,086 6,746


1,163,467 1,177,877 0 378,313 378,313 595,619 595,619 14,410


1,098,844 1,111,992 0 243,650 243,650 539,171 539,172 13,149

Note: Data above does not include non-modeled generators in RTMG and RMR day ahead energy sales in DAES given the use of data in CMM. Volumes are used for reporting only and do not impact credit calculations.

Next Week

• ERCOT– Will send ACLs for DAM and CRR Auction– Will not override ACLs

• Will send collateral calls if exposure exceeds credit limit • If ERCOT sends a collateral call, the CP will likely not be able to

bid in DAM until additional e-collateral is received

• Counter-Parties– Since ERCOT no longer overrides ACLs, CPs should review Credit

Reports and consider a) their exposure and

b) upcoming DAM, CRR Auction and any LFC test

c) that the ACL report indicates the total ACL and does not reflect any credit limit held for the CRR auction

– ERCOT has not seen many bilateral trades for CRRs. CPs are requested to initiate a few trades to test this functionality.


Next Week - Schedule of activity


Business day Activity to consider ACL deliveredDeadline for

"e-collateral"

Monday, August 23DAM for OD 8/24 ACL CRR Lockdown 5pm

Friday evening Monday evening (CRRs)

Friday noon Monday noon

Tuesday,August 24DAM for OD 8/25 ACL CRR Lockdown Monday evening Monday noon

Wednesday, August 25DAM for OD 8/26 ACL CRR Lockdown Tuesday evening Tuesday noon

Thursday, August 26DAM for OD 8/27 ACL CRR Lockdown Wednesday evening Wednesday noon

Friday, August 27DAM for OD 8/28 ACL CRR Lockdown Thursday evening Thursday noon

Note 2: the CRR ACL will unlock on Monday, August 30.

Note 1: Credit for DAM runs this week will utiize 'e' factors as per notices sent on August 4th (of August 18 if there was an 'e' factor change) or the 'e' factors that CPs specified. The paramaters used were (d,a,b,y,z,u,t) as they will be after the first 60 days of the market.

Next week – schedule of activity

• CRR Credit Constraint – Time Sensitive – On the CRR Friday call, a problem with the implementation of the A

and M factors in the credit constraint in prior auctions was noted.• Treatment will be fixed for the September CRR Auction occurring next week• The corrected treatment will increase how much credit is consumed in the

auction– (e.g. where $5.50 was consumed in prior auctions, $9.50 will be consumed

in the September auction)– See CRR slides for more information

• CPs participating in the September auction should post additional e-collateral as needed no later than Monday noon.

NOTE: The Market Credit Work Group has been reviewing how the A and M factors interact.


Other topics

• Tentative timeline for First Priority Security Interest document– July 1, 2010 – ERCOT circulated initial draft to CPs.

– July 19, 2010 – Comments back from CPs.

– August 6, 2010 – ERCOT circulated second draft to CPs.

– August 17, 2010 – ERCOT reviewed document with F&A.

– August 23, 2010 – Final comments due back from CPs.

– September 21, 2010 – Final review and possible approval by F&A and ERCOT Board.

• “e” Factors– Current biweekly “e” factor reset will be effective for the DAM run on Friday,

August 20th for operating day Saturday, August 21st

– Next biweekly “e” factor reset is planned for the DAM run on Friday, September 3rd for operating day Saturday, September 4th with notices sent by 9:00 am on Wednesday, September 1th


Other topics – “e” factors

– Alternative or Favorable treatment

• CPs should notify ERCOT of their desire to receive the “alternative” or “favorable” treatment in Market Trials

– by sending an e-mail to [email protected] with “Credit – “e” factors – favorable treatment requested” in the subject line

– Finally, if CPs do not believe their DAM activity in Market Trials in July and August is indicative of their projected activity after “Go Live”, they may request ERCOT to set their “e” - factors to reflect their anticipated activity

» By sending an e-mail to [email protected] with “Credit – “e” factor – specific “e” factors requested” in the subject line and the e factors requested in the body of the e-mail

» Any “override” will be effective until the next bi-weekly reset (e.g. must be requested again or factors will be reset based on data)

Note: Request for favorable or specific treatment should be sent by Monday, August 30th for the Wednesday, September 1st reset.


“e” Factors – Bi-weekly Process - Market Trials

Notice from ERCOT by 9:00 amDAM runs from (Scheduled reset date) DAM runs to Operating Day from Operating Day to

Market Trials

Wednesday, August 4, 2010 Monday, August 9, 2010 Thursday, August 19, 2010 Tuesday, August 10, 2010 Friday, August 20, 2010

Wednesday, August 18, 2010 Friday, August 20, 2010 Thursday, September 2, 2010 Saturday, August 21, 2010 Friday, September 3, 2010

Wednesday, September 1, 2010 Friday, September 3, 2010 Thursday, September 16, 2010 Saturday, September 4, 2010 Friday, September 17, 2010

Wednesday, September 15, 2010 Friday, September 17, 2010 Thursday, September 30, 2010 Saturday, September 18, 2010 Friday, October 1, 2010

New Known Issues

• New known issue

– ERCOT has identified an error in the “e2” Factor calculation. • The “e2” factor calculation is using energy only offer volumes when it should use

energy bid volumes. Issue is fixed and pending migration.• The “e1” calculation is correct.

– Note: Known Issues can be reviewed at : http://nodal.ercot.com/readiness/markettrials/coms/index.html,


FAQs

• When the ADTE has been adjusted, how is it incorporated into the AIL calculation?

– The AIL report displays both the unadjusted AIL and the Adjusted AIL. If the ADTE has been adjusted, the AIL report reflects only the Adjusted ADTE in the conformed ADTE. If you wish to shadow the calculation of the unadjusted AIL for some reason, you will need to look to the EAL or EAL Detail Report to obtain the unadjusted ADTE and calculate the Conformed ADTE.


Http://nodal.ercot.com 1 COMS/Settlements/Credit Weekly Update August 20, 2010.

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