Oh, it's so pretty. And it's got so many flashing lights.
A massive flywheel will spin for a long time, if it has good bearings and is not slowed by air friction.
Isaac Newton would look at this and just shake his head.
The problem with massive flywheels, is that you don't want a massive flywheel
The higher the electrical load on the output, the harder it is to turn the generator shaft. A large flywheel will run down faster with more load. Physics still applies here.
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