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A huge battery has replaced Hawaii's last coal plant
(www.canarymedia.com)
This is a most excellent place for technology news and articles.
Coal is also energy storage, well, all fossil fuels. That's their primary advantage, on-demand easily accessible stores of energy.
If only they didn't simultaneously pollute and cook the earth when used...
They are stored solar energy! Releasing the energy also unfortunately releases the carbon into the atmosphere.