I've already got the system beat.
I have a duplex (a house with two sides).
One side is connected to the grid on a 'Time Of Day' tariff where the power is sold to me at one-half price during off-peak times (half the day and all night).
The other side is connected to the grid on a 'Renewables Reversible' tariff where they pay me double price for my "renewable" power. I have a small solar cell on the roof, for legal-decoration purposes; not even hooked-up to anything.
In the common basement is a motor-generator set capable of 200A. I buy half-price power and sell them double-price power.
I'm making $85K a year on the deal.
That's some "Green Power".