Comparisons of CDR Report and Transmission Planning Models Transmission Planning Models CDR Report SSWG RTP Reliability Cases RTP Economic Cases Provide power flow cases for Provide a flow case for Provide a range of power flow use in developing the use in developing the cases with a common reference Purpose Provide an reliability portion of the economic assessment portion point for ERCOT and Market ERCOT Regional of the ERCOT Regional Participants. Transmission Plan Transmission Plan Load Forecast Inputs Preparer ERCOT TSPs ERCOT and TSPs ERCOT Four seasons for current year Summer peak for next 6 Summer peak for future Full year hourly analysis for Season Summer and Winter years Years 1, 3, 5, and 6 Future Years 3 and 6 Minimum load and high wind for a future year Higher of: TSP ; or Average weather Average weather ERCOT 90th (expect actual load to (expect actual load to Weather Assumptions Varies by TSP percentileforecast(expect exceed forecast one out of exceed forecast one out of actual load to exceed two years) two years) forecast one out of ten years) Coincident Peak load by individual Load Coincidence (single peak load hour for by weather zone substation (non-coincident) ERCOT Region) Included Demand Response (shown as separate line Not Included Not included Not Included Programs item)
Comparisons of CDR Report and Transmission Planning Models CDR Report Transmission Planning Models SSWG RTP Reliability Cases RTP Economic Cases Purpose Provide an Provide a range of power flow cases with a common reference point for ERCOT and Market Participants. Provide power flow cases for use in developing the reliability portion of the ERCOT Regional Transmission Plan Provide a flow case for use in developing the economic assessment portion of the ERCOT Regional Transmission Plan Load Forecast Inputs Preparer ERCOT TSPs ERCOT and TSPs ERCOT Season Summer and Winter Four seasons for current year Summer peak for next 6 years Minimum load and high wind for a future year Summer peak for future Years 1, 3, 5, and 6 Full year hourly analysis for Future Years 3 and 6 Weather Assumptions Average weather (expect actual load to exceed forecast one out of two years) Varies by TSP Higher of: TSP ; or ERCOT 90th percentileforecast(expect actual load to exceed forecast one out of ten years) Average weather (expect actual load to exceed forecast one out of two years) Load Coincidence Coincident (single peak load hour for ERCOT Region) Peak load by individual substation (non-coincident) by weather zone Demand Response Programs Included (shown as separate line item) Not Included Not included Not Included
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