[hirundo]

1. Build a large superconducting flywheel energy storage system like they have in Japan, right under the launch centrifuge.

2. Use it continually to arbitrage energy prices. Buy low sell high.

3. At launch time divert the rotational energy to the centrifuge. (I'd like to see that clutch.)

4. Profit

[timpattinson]

5. Forget about the rockets, just buy and sell energy

[simonebrunozzi]

Couldn't you simply do it with a battery?

[Cthulhu_]

Not a scientist, but in theory flywheels or any kind of mechanical energy storage have less energy loss than chemical energy storage like batteries. Then there's wear and tear, switching, etc.

[TaylorAlexander]

Yes but then how would you raise all the investor funds to funnel to your offshore accounts?