Cheap electricity at night is utilised to pre-freeze air conditioners

California wants better batteries, which is why the electric company Southern California Edison is planning a set of, let’s say, unconventional energy storage solutions, including huge 450-gallon ice packs. Why? It all has to do with a little-known problem with California’s wind-reliant electric grid.

Wind turbines, you see, spin merrily into the night, generating surplus power even when there aren’t enough people awake to use it. That’s why electricity is often cheaper at night. Sometimes, the situation gets so absurd that the price of electricity actually drops below zero and becomes negative. The most obvious solution is to store that energy until demand is up again, but building batteries with hundreds of megawatts of capacity — enough to power millions of lightbulbs — is a tall task.

Recently, the New York Times reports, Southern California Edison held a competition to figure how to keep up after retiring a nuclear generator and natural gas units. Instead of constructing many new power plans, the electric company decided to build better batteries, including what will be the largest lithium battery in the world.

via California’s Grid May Soon Store Energy In Giant Ice Packs  | Gizmodo Australia.