Market Trials Known Issues Review

1. Market TrialsKnown Issues Review NATF September 30, 2010 http://nodal.ercot.com 1

2. Know Issues Review – Outage Scheduler • No open Market facing issues after the releases occurring over the next 2 weeks http://nodal.ercot.com 2

3. Know Issues Review – Congestion Revenue Rights • Not all Settlement Points (Resources) are mapped from the Network Model to the CRR Network Model • The islanding issues are fixed in the network model. The CRR team is currently updating the settlement point file manually. Future models from the Topology Processor should contain all the correct information. • Connectivity Node name and Connectivity Node to Connectivity Node Group Mapping is not currently complete in the Network Model • TDSP's continue to update the network model. As the information becomes available to CRR, the CRR network files are being updated as well. Future models from the Topology Processor should contain all the correct information. • The Topology Processor which creates the CRR network files does not handle outages correctly for the PSSE file. • The CRR network is based on the TCR market PSSE file, which is then augmented for the CRR software. • The 2011 Annual Auction in Market Trials did not set the Restricted Date correctly, thus allow OBL buys beyond the first month. • The CRR desk procedures have been updated to include multiple cross checks so that this does not happen in Go Live. • The Non-Thermal Constraints file for the October 2010 auction had a number of lines in the wrong direction. • The file was fixed and re-uploaded to the October 2010 auction in Market Trials. The CRR desk procedures now include an added step to validate the line directions. http://nodal.ercot.com 3

4. Know Issues Review – Settlements • TELHSL calculation issues • The current implementation of TELHSLFLAG is not appropriately exempting resources from Base Point Deviation during startup.  The methodology proposed in NPRR 273 (exemption when the resource is in an ONTEST status) provides a feasible and efficient option for correcting this issue by go-live. • TWTG calculation not being time-weighted for SCED intervals • TWTG is not being time-weighted according to SCED interval duration, it is being calculated as the simple average of generation over the 15-minute settlement interval. http://nodal.ercot.com 4

5. Know Issues Review – Credit / CMM • No Open Issues http://nodal.ercot.com 5

6. Know Issues Review – Real Time Market / LFC • State Estimator Reports due to NPRR202 Concerns • NP6-619-CD : State estimator Transmission Flows and Voltages. • NP6-622-CD: State estimator Transformer Information. • NP3-365-EX: State Estimator Statistics Extract • Other Reports with Defects: • NP5-649-CD Temporarily Removed Contingencies - • NP8-143-CD QSE Ancillary Services Capacity Monitor -- on track to be fixed by go-live • NP3-129-CD Daily Competitive Constraints • NP5-615-SG Standard Contingency List - still unavailable – on track to be fixed by go-live • CM-COPCK-NOTF message should not be sent for non-modeled resources • Non-modeled Resources still receive a message stating that their COP submission is missing. • 'NP3-217-Forecasted Temperature Adjusted Dynamic Ratings • Report output sort order is incorrect. • The pause and return to normal threshold for UDBP in response to a frequency deviation is set to the same value. • During the LFC test on the 8/20/10, it was observed that the pause and return to normal threshold for UDBP in response to a frequency deviation is essentially set to the same value. While the threshold works for indicator for pausing the UDBP, a separate threshold needs to be created for a return to normal status. • NP6-905-CD, Settlement Point Prices at Resource Nodes, Hubs and Load Zones: Report is not being posted when SCED isn't running • When SCED has not run for an extended period of time, SPP reports are not posted. Because SPPs are generated in MMS every 15 minutes regardless of whether SCED is running or not, they still need to be posted every 15 minutes. Currently, the report trigger depends on a SCED completion event. The trigger will need to be modified based on when new data is populated in the database from which the SPP report data is pulled. • Operating display not showing next hour COP responsibilities for all combined cycle configurations • Internal work-around being developed and reviewed • Energy Offer Curve rejected for credit exposure validation in Real Time Market • Issue only occurs at (and is related to) the closing of the adjustment period • Fixed in MMS Patch 10 http://nodal.ercot.com 6

7. Know Issues Review – Day Ahead Market • AS Offer, Energy Only Offer, Energy Bid, PTP Obligation, CRR Offer query issue: when transactions exist in the system that do not cover all 24 hours but have identical values for every hour that is part of the transaction, the system is filling in the interior hours for the whole time period when querying. NP6-619-CD : State estimator Transmission Flows and Voltages. • Fixed in Patch 10 • SASMID field incorrect in the SASM Aggregated AS Offer Curve report • Fix targeted for October • MMS is accepting bids/offers with negative quantities when there is more than one Price / Quantity pair. • New Issue (9/24) – DAM Operators will cancel these transactions • Resolution in review • Self Energy Trades Issue • If the Buyer and Seller are same for an Energy Trade in MMS, the query of this trade is erroneously returning the Confirmed_flag as FALSE. • Fixed in Patch 10 • Award report rounding • DAM/SASM AS award reports received by QSEs are different than actual award by 0.1 or 0.2 MW due to rounding • Fix targeted for October • POD defect • Network security monitoring contingency constraint filtering caused a CRR Offer to be available in DAM that caused a contingency constraint. • Fixed in Patch 10 http://nodal.ercot.com 7