Battery Let MIT Solve The Energy Storage Issue

Down here the thought of un-carboning energy is almost impossible.
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It's impossible everywhere unless we go max effort for nuke. Every single one of these techs: wind and solar, require 100% fossil plant backup. Meaning that for every MWe that they claim to produce they require a full time running fossil plant. That's so when they don't produce the fossil plant can jump in and take up the load.