2010 Load Impact Evaluation of California's Statewide Base Interruptible Program

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Created on Thursday, 31 March 2011 00:00

This report provides load impact estimates for the Base Interruptible Program (BIP), which is offered by each of California’s three major investor-owned utilities, Southern California Edison (SCE), Pacific Gas and Electric (PG&E) and San Diego Gas & Electric (SDG&E).

Ex post load impact estimates are provided for 2010 and ex ante estimates are developed for 2011 through 2021. For the typical event day in a 1-in-2 weather year, BIP is projected to deliver a statewide load reduction of 725 MW in 2011. By 2014, the statewide aggregate load impact is expected to grow by 12% to 815 MW. These results are not significantly different for 1-in-10 weather year conditions because BIP customers are not weather-sensitive on average. Most of the resource is located within SCE's local capacity areas (LCA). The LA Basin LCA in SCE's service territory comprises 51% of the statewide aggregate load impact. PG&E's Other LCA is the only area outside of SCE’s territory that provides more than 4% of the statewide aggregate load impact. In addition to ex post and ex ante load impact estimates, the report provides an overview of the program, discussion of the methodology and recommendations for future evaluations.

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