Homemade Energy

You'll need an inverter that feeds the grid at 240v/ac. When you actually put electricity into the grid your electric meter spins backwards. A lot of people claim you can get paid by the electric companies, if you feed more power than you consume. The truth is it's a voucher, not cash. They'll credit you the KWH that you've provided the grid.

Still, not having to pay anything for electricity is pretty darn cool to me.

That's just one of the bennies of Homemade Energy

I saw a taxi drive down the road that said "runs on biofuel" I thought, now that's awesome!"

Tons of oil that could be used for: running a car, heat or to generate electricity is wasted. Even regular used motor oil can be burned for heat. Did you know companies pay to get used oil disposed of, and if that oil gets spilled during transport, the company not the transporter is held responsible? Hmmm... think you could get some free oil? Check your local industrial park, their usually located near airports or train tracks.
If you'd rather go the biodiesel route off-grid-living has some great information and how to's