California Heat Wave Tests Grid as Power Demand Surges

By ZeroHedge - Sep 09, 2026, 9:00 AM CDT Heat advisories and extreme heat warnings cover large parts of California, with temperatures above 100°F expected in parts of Southern California and the Central Valley. CAISO expects peak electricity demand to approach 47,379 MW on Wednesday, still below its all-time 52,061 MW record. Rising air-conditioning demand is lifting wholesale power prices and increasing evening grid pressure as solar generation falls. The National Weather Service has issued heat advisories across California's Central Valley and coastal areas, including the Bay Area and Los Angeles, with more severe extreme heat warnings in parts of Southern California. Cooling demand is expected to soar over the next several days, putting pressure on the power grid, particularly in the evening as solar generation declines.Bloomberg reports that Los Angeles-area temperatures are forecast to reach 85F to 105F, roughly 10 to 15 degrees above normal. San Francisco could hit 86 degrees Wednesday, while Sacramento is expected to reach 100 degrees Thursday.The California Independent System Operator forecasts that peak power demand will hit 47,379 megawatts Wednesday, below the September 2022 record of 52,061 megawatts.CAISO, which operates the power grid serving roughly 80% of California and a small part of Nevada, forecasts Thursday's peak at around 45,183 megawatts.Wholesale power prices are already reflecting the incoming surge in cooling demand. Southern California's SP15 hub saw its day-ahead price for Tuesday's 6 p.m. hour reach $87.69 per megawatt-hour, the highest hourly reading in a little over a week. Grid monitoring company Arcus Power compiled the data on its NRGStream platform.Forecasts from Bloomberg show that maximum temperatures in California will peak Thursday at around 95F before sliding to about 75F by mid-month.By ZerohedgeMore Top Reads From Oilprice.comOil Nears $100 as U.S. Destroys Five Iranian TankersVitol CEO: Global Fuel Markets Are "Tight and Inflexible"Gulf Producers Find Workarounds As Hormuz Tensions Persist Download The Free Oilprice App Today Back to homepage