Item 19- Presentation: Storage Working Group — original pdf
Backup
Methods to reduce Load Zone Price Separation -Add additional Transmission capacity -Reduce average Load Zone prices -Responsive Load or local generation within the Load Zone -Reduce the time duration of lower than contracted prices at the Generator Node -Other? The largest risk to AE customers appears to be from local Load Zone prices becoming very high for long durations AEN: Austin Energy Load Zone Generator node with its LMP (Locational Marginal Price) at that node Methods to reduce Load Zone Price Separation 1.Add additional Transmission capacity - ERCOT 765kV STEP transmission lines should help. .but how much will this help the net import capacity to the AE load zone ? 2.Reduce average AEN Load Zone prices - The Load Zone price that AE pays is the weighted average of the Nodal prices within the AEN Load Zone - Reducing the higher prices of these internal nodes should reduce the Load Zone prices 3.Responsive Load within the Load Zone and local generation 4.Reduce the time duration of lower-than-contracted prices at the Generator Node -When AE contracts for a generators power, say $35/MWH, AE guarantees that $35 price to the generator - When the Locational Marginal Price (LMP) of the ERCOT dispatch is higher than the $35 contracted price, AE benefits from the difference - When the Locational Marginal Price (LMP) of the ERCOT dispatch is lower than the $35 contracted price, AE must make up the difference to the generator 5.Other? Accretive Storage Applications A vision, but analysis needed C&I Behind the meter Demand charge reduction Storage Cost $/MWH Utility Storage: DR, 4CP and Ancillary Services + Energy Arbitrage Within Load Zone: -To reduce LMP Node prices to reduce average Load Zone Price -For VAR/Voltage support At Generator Node to reduce costs at that LMP node from transmission bottlenecks Utility Storage: VAR, Voltage support Short term peaker replacement Utility Storage: Investment Deferral or Avoided Costs for T&D, other Utility Storage: mid-long term dispatchable energy source Year