Randall Munroe (the creator of XKCD) has created a “what-if” blog which is bound to become a delightful waste of time. One of the first questions he asks is “What if we could harness the force to generate energy?”
After doing some calculations comparing Yoda, the Emperor and Luke Skywalker’s force abilities he concludes:
At current electricity prices, Yoda would be worth about $2/hour…
So Yoda sounds like our best bet as an energy source. But with world electricity consumption pushing 2 terawatts, it would take a hundred million Yodas to meet our demands. All things considered, switching to Yoda Power probably isn’t worth the trouble—though it would definitely be green.
Ultimately using superman Superman to generate green energy is probably a better option.