Saw on TV how a hydro power station uses gigantic inverters/UPSs to "bank" power to batteries during off peak times, then feed it back into the grid once peak starts.
So I thought - why couldn't anyone do this? If you have a power connection that will credit you for power you return to the grid (usually for renewable energy setups that sell back generated but unused power) then why not just use an inverter and a big-ass battery bank? Buy cheap off peak power a few hours before it ends to charge your batteries, then feed it back in once peak starts. Even though it sounds shifty you are actually providing a useful service since you're boosting the grid (by a tiny amount) during peak.
Thoughts?
