Energy storage is essential for wind and solar energy for several key reasons: 1. Intermittency mitigation, 2. . The wind was strong, the sun was beaming, and the state generated enough renewable electricity to meet 103 percent of consumer demand for several hours. Yet, even as that historic record was broken, fossil fuel power plants were still running in California that day. Why couldn't the state shut down. . The International Energy Agency (IEA) emphasises that grid-scale storage, notably batteries and pumped-hydro, is critical to balancing intermittent renewables like solar and wind.
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