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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.
Geothermal energy requires a very stable heat source near the surface. Unfortunately, while volcanoes meet both the "heat source" and "near surface" criteria, they are not at all stable.
It's still wild to me that I visited Hawaii as a kid, and then several years later. When I went back, a road I had driven on as kid was covered in lava.