6 West Texas fires in March through May Approximate cost of Transmission equipment damage and maintenance FireContamination $3,994,264$1,340,940 Approximate cost of Distribution equipment damage and maintenance FireContamination $1,500,000$313,780 Approximate Cost of Congestion Day-Ahead MarketReal-Time Market $2,170,840.56$1,127,056.03 Wildfires
14 PRC Physical Responsive Capability (PRC) –A representation of the total amount of system wide On-Line capability that has a high probability of being able to quickly respond to system disturbances
15 June 27 th EEA Highlights 3 unit trips in less than 2 hours –Total of 1,800 MW Large wind decline –Drop of 4,200 MW in 4 hours Large load increase –Increase of 4,000 MW in 2 hours Below 2,300 MW of Reserves for 1 minute EEA lasted for 1 hour and 25 minutes
42 ERCOT CDR - Report on the Capacity, Demand, and Reserves in the ERCOT Region Long-term planning tool Uses normalized assumptions –Normal weather basis –Does not include Resource outages Summer Summary released in December of 2011. –Peak Demand – 66,195 MW 64,618 MW firm load 738 MW of firm load added since June CDR –Available Capacity – 72,444 MW –Reserve Margin – 12.11%
43 Seasonal Assessment of Resource Adequacy (SARA) New report Evaluates near-term Reserve adequacy –Uses more recent seasonal climate forecast –Accounts for specific events (e.g. Drought) Evaluate the range of reserves usage in a deterministic manner –Uses of reserves: Higher peak demands due to above normal weather Forced generation outages Planned generation outages Atypical issues like drought Lower wind availability Determines the likelihood of Reserves dropping below the 2,300 MW threshold.
44 Emergency Interruptible Load Service (EILS) Proposed Changes –Allow Distributed Generation and unregistered generation to participate New capacity –Remove the 1 MW minimum offer Improve QSE flexibility Increase participation –Explore the possibility of a 30-min product Increase participation