just ignore this

not much going on here

The physics behind this idea have been known for over 200 years. If it were possible to generate lots of power cheaper than existing sources, somebody would've tried it by now. It would probably cost trillions of dollars to build a bunch of flywheels that had enough mass to generate even 1 megawatt. It's probably a better idea to build more hydroelectric dams, or make nuclear power cheaper.

Nothing has zero impact. However, 25% of Iceland's power is geothermal ...

This has to be one of the craziest ideas I've heard here, at least try to a normal gyroscope as the Russian tried twenty years ago but still failed. There is a far easier to harvest energy that is generated somewhat by the same rotation with a little help from the moon, that is tidal waves, it would be far easier to create artificial estuaries for this rather than putting disks around the earth. Has already been tried, even with the theoretical gain the loss of energy incurred by the gears still gives a negative effect. Yeah because they will be made be of unrealizablium probably.

If you'd build this "disk", it would create a very large force with a very small movement. That's not easy to harvest, there's a reason any conventional engine runs at high RPM. If you end up with 1 round per day, that's not very useful. I was going to suggest this too. Tidal energy comes entirely from the earth's rotation. It even "leaks" a bit of energy towards the moon.