The California Independent System Operator (CAISO) overestimated the capacity available from demand response and renewables during a period of rolling power outages in August, FERC staff said during a presentation Thursday.


However, against the wishes of Chairman James Danly, the Federal Energy Regulatory Commission during its monthly meeting voted 2-1 against a proposed order to examine whether CAISO’s rules are “unduly discriminatory or preferential” by favoring these resources over natural gas, hydroelectric and nuclear.

Citing a report from CAISO’s Department of Market Monitoring, FERC staff said the California grid operator credited wind, solar and demand response resources for more capacity than was actually available when load-shedding occurred Aug....