The heatwave that's been hitting California and other states in the West has been a beast of a problem. It's crippling grids, which even has utilities and governments asking people to not charge their electric
The immense amount of solar power in California provides important megawatt-hours of electricity during high-demand periods of the day, but as the sun starts to go down and those solar systems stop collecting energy and producing electricity with it, it’s the battery storage that does the extra heavy lifting and comes to the rescue.S&P Global notes that California had approximately 884 megawatts of power capacity in place from small-scale battery systems at the beginning of August.
“Two years ago, just before Mainzer took the helm at CAISO, the grid operator could not even muster 200 MW of battery discharge on back-to-back days of rotating outages. This time around, with battery output hitting nearly 3,400 MW at one point during the capacity crunch, a full-blown crisis was avoided.”
In the graph above, you can see how battery storage surges from about 5pm to 10pm, and then again from about 6am to 7am, providing electricity at times of critical need and high stress. In the evening of September 5, it surged to well above 3,000 MW for a period of time. S&P Global also references the 3,600+ residential Tesla batteries combining as a “virtual power plant” for PG&E, saying that they are “participating in California’s emergency load reduction program as a remote-controlled hive of distributed batteries.” These batteries combined for an output of 24 MW at times. The 3,600+ total comes from Tesla inviting more than 25,000 Tesla battery owners to participate in the program.
The grid is rapidly evolving, and at just the right time. One more distributed clean energy players is looking to put its own stamp on the story and bring solar plus batteries to the table in another way to help customers avoid a grid crisis. “Sunnova Energy International Inc. is pursuing a different model.
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