We’ve been hearing more and more in the past couple of years about battery backup for intermittent solar. No matter how far battery technology progresses, they will always need lots of land, replacement and — for 100% reliability — unimaginable costs. Under the most optimistic lithium battery cost projections, just two weeks of 100% backup power for Oahu would cost about $500 billion and occupy 5 square miles. Even the wildest projections for sodium batteries would only reduce that cost to about $50 billion and 4 square miles.
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