Wednesday, October 22, 2014

California ISO: Challenging 2014 summer but reliability held firm

By Editors of Electric Light & Power/ POWERGRID International 

The California Independent System Operator Corporation grid operators managed reliable electricity delivery this summer through major wildfires, historic drought conditions and heat waves.

This summer’s highest level of demand reached 45,090 MW at 4:53 p.m. on September 15, 2014. This compares to 45,097 MW set on June 28, 2013 and 46,846 MW on August 13, 2012. The ISO’s highest peak on record is 50,270 MW on July 24, 2006.

On a local level, southern California set new demand records that underscore the impact from above normal — hot — temperatures recorded during the summer, especially along the coast. San Diego Gas & Electric area experienced record use on Monday, September 15 and then topped that on September 16 with an all-time record demand of 4,895 MW. The standing record peak was 4,684 MW set on September 27, 2010.


Southern California Edison area also experienced heavy loads reaching 23,266 MW on September 15. This was just shy of the area’s all-time peak of 23,388 MW set on September 7, 2011.

Meanwhile, one of the California ISO’s newest participating transmission owners, Valley Electric Association of Pahrump, Nevada, which serves a 6,800 square mile area south of Las Vegas and a sliver of California, set a new demand record of 120 MW on July 1, 2014.

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