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Are those (e.g. flywheels, compressed air) production-ready or just start-up ideas? Also flywheels have a pretty destructive worst-case failure mode...

> heated water

How does that work (specifically for storing electricity)?




Re energy storage generally, heating is a top energy user in many parts of the world and I think relevant to the conversation. In places with CHP plants and district heating systems, the thermal battery concept is tried and tested. Since the system is already based on circulating hot water around, putting some storage tanks/caverns in the system is straightforward.


> flywheels have a pretty destructive worst-case failure mode...

Do they? If their casing is solid enough, the worst that they can do is damage themselves internally and heat up a bit. There is no buildup of pressure, leakage of chemicals or risk of a chemical fire.


Many data centers use flywheels


Not if the flywheel is in space!




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