Instead of pegging to the price of a kWh, why not just peg to the dollar?

Anyway, the central authority will quickly go bankrupt and then people will be unable to redeem their coins for kWh.
Read this before continuing to make suggestions:
https://secure.wikimedia.org/wikipedia/en/wiki/Currency_pegOn top of that, you're suggesting all fees will be arbitrarily set by a central authority which can change its mind at any time. Hahaha! You made a joke!
