Utility-scale lithium-ion battery energy storage systems (BESS), together with wind and solar power, are increasingly promoted as the solution to enabling a “clean” energy future. 2. . Several storage technologies are in use on the U. Pumped hydroelectric and compressed air energy storage can be used to store excess energy for applications requiring 10 or more hours of storage. The sun provides most of California's electricity during the day. But it is a different story at night. Yet, new battery chemistries being developed may pose a challenge to the dominance of lithium-ion batteries in the years. . Similar to common rechargeable batteries, very large batteries can store electricity until it is needed.
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