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CMWG Update to WMS

Stay informed with the latest updates from the CMWG regarding WMS assignments, competitive constraint test modifications, congestion cost calculations, and more. Highlights include discussions on NPRR 327, ROS meeting recap, and CRR auction adjustments.

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CMWG Update to WMS

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  1. CMWG Update to WMS 11-9-11 M Wagner Edison Mission Marketing & Trading

  2. CMWG Met 11/8/11 • WMS Assignments • Any tweaks needed to congestion cost calculation • Competitive Constraint Test Modifications • Other Topics • PGRR 11 Meeting Quick Recap—noted 10/21 ROS meeting and postings. • NPRR 327—Redact State Estimator Data—ERCOT filed comments proposing changes to reduce the FTE impact which could smooth path • NOMCRs in CRR auction • TSAT • W—N • CRR AuctionBid limits

  3. Congestion Cost Calculations • ERCOT presented talking points related to ROS Report of Congestion Costs • ROS Report looks like:

  4. Congestion Cost Calculations ct’d • ERCOT calculates congestion cost as: Shadow Price * Line Rating • CMWG had no opposition to the following points: • ERCOT continue publishing congestion cost list for ROS, but suggest that column be labeled as: “Congestion Rent” to point out that the congestion impacts are not borne entirely by a single group • Footnote the document to clarify that the list is a tool to identify potential areas of the system that may warrant further study from a planning perspective. • WMS endorse the language above (“footnote”)?

  5. Competitive Constraint Test • ERCOT and IMM are examining whether it is possible to provide info on how many instances of dispatch on the Step 2 mitigation offer curve have occurred • Limited progress due to competing priorities within ERCOT—but commitment to support effort • Per Protocols--TAC approved subcommittee to conduct test—but nodal fee paid for development of tools at ERCOT to conduct the test—so historically have relied upon ERCOT to evaluate • Tight timeline, need changes to WMS by April ‘12

  6. Other Items • Transmission Stability Analysis Tool • Will calculate up to date limits for W—N • ERCOT to implement in January ‘12, software update/testing in Dec. • Trying to do DA and RT at same time • NOMCRs in CRR Auction • No process documented • CMWG will develop a draft for consideration • IMM Raised issue of whether CRR points behind net metering points are needed • CRR Auction bid limits – need to revisit process • W—N Congestion—appears that plants w/o PSS lowering transfer by hundreds of MW. IMM noted that issue did not appear to be a significant problem.

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