Nodal Settlement Options and GTC Limits in ERCOT
The Congestion Management Working Group discussed settlement options for Controllable Load Resources in ERCOT, focusing on separate metering and netting of charges. It also covered Panhandle GTLs and implementation plans for NPRR 1111 and SCR 819. The next meeting is scheduled for April 25.
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Presentation Transcript
Congestion Management Working Group APRIL 6, 2021 KATIE RICH, CHAIR ANDY NGUYEN, VICE CHAIR
Nodal Settlement of Controllable Load Resources (CLRs) o ERCOT presented two options for settlement of co-located CLRs o Under Option 1, an additional meter would be added for the CLR. The injection to the grid and the CLR would be settled at a nodal price. If the site is net consumption over a 15-minute interval, aux and other load would be settled at a load zone price. oIn this scenario, CLR consumption is always measured and settled o Under Option 2, each point of interconnection (POI) meter will have two nodal prices: oWeighted by the net of all basepoints (Generation Resource (GR) and CLR) if the net is positive oWeighted by the net of all basepoints (GR and CLR) if the net is negative o In this scenario, ERCOT is not involved in the settlements between the GR and CLR. ERCOT only settles the net at the POI meter.
Nodal Settlement of Controllable Load Resources (CLRs) o ERCOT plans to file an NPRR selecting the Option 1 arrangement. The separate metering would result in CLRs receiving 4CP and other load charges. oFollowing the CMWG meeting, ERCOT is reviewing the exclusion of 4CP charges o One stakeholder presented an alternative to ERCOT s proposal that would continue to allow for netting of 4CP and load ratio share (LRS) cost allocation. Without this allowance, it could be argued that there s a disincentive for loads to become CLRs. o CMWG is seeking feedback from WMS on how to proceed with this issue
Panhandle GTLs o ERCOT explained that a GTC limit is determined as the lower of: oCalculated static voltage stability limit from VSAT, or oTable-based dynamic voltage stability limit under various outages o If the stability limit is not reached, then the output is 9999 o CRRs and real-time will be based on the max dispatch
NPRR 1111 and SCR 819 Implementation Plan o Intermittent Renewable Resources (IRRs) behind a binding GTC with a shift factor greater than X% on the GTC flow should not exceed their SCED basepoint when the not-to-exceed (NTE) limit is triggered oThe % threshold will vary by GTC o Implementation is expected for this fall, starting with the Panhandle and possible North Edinburg to Lobo GTCs o ERCOT will provide a report on NTE performance on a periodic basis
