Google

Xcel Energy

The Battery That Rusts on Purpose to Keep the Lights On for Days

Aug 14, 2026

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6 min read

The Battery That Rusts on Purpose to Keep the Lights On for Days

Google and Xcel Energy just announced the largest grid battery ever proposed: 30 gigawatt-hours of storage built to run for 100 hours straight by rusting iron on command. It is a bet that patience, not speed, is what lets solar and wind power an AI data centre around the clock.

Alliant Energy

+10

A battery that runs on CO2 - But is it efficient ?

Jul 1, 2026

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4 min read

A battery that runs on CO2 - But is it efficient ?

Storing a full day of clean power is the missing piece of a wind-and-solar grid — and lithium gets expensive past a few hours. Energy Dome's answer skips lithium entirely: it banks power by squeezing carbon dioxide into a liquid. Now a US utility and Google are putting money behind it.