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Cal-ISO issues restricted maintenance operations on heat wave

Houston — The California Independent System Operator has issued a restricted maintenance operations notice for its footprint on higher temperature forecasts and expected load.

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The notice is in effect from 6 am PDT Tuesday through 11 pm PDT Wednesday. During that time, market participants are warned to avoid actions which may jeopardize generator and/or transmission availability, the ISO said.

Cal-ISO forecast peakload around 46,150 MW Tuesday and 45,725 MW Wednesday. If Tuesday's forecast is reached, it would be the highest level since September 2015.

High temperatures in Los Angeles are forecast in the low 80s Tuesday and Wednesday, 8 degrees above normal, while highs in Sacramento are expected to reach 106 Tuesday and 101 Wednesday, 8 degrees above normal, according to CustomWeather.



A heat advisory and an excessive heat warning were in effect across portions of California, according to the National Weather Service. Highs across California are expected as high as 116 degrees in Redding.

An excessive heat warning means a prolonged period of hot weather is expected.

SP15 on-peak day-ahead jumped $51.50 for Wednesday delivery to the upper $120s/MWh on Intercontinental Exchange.

The SP15 on-peak 15-minute market is bid at $80/MWh and offered at $140/MWh on ICE for Tuesday.

The ISO's all-time peakload record is 50,270 MW, which was reached July 24, 2006.

--Kassia Micek, kassia.micek@spglobal.com

--Edited by Valarie Jackson, valarie.jackson@spglobal.com