I've just got my electricity bill, and seen the breakdown of what we used and what our solar installation fed back into the grid.
Frankly, it made the self-congratulatory effusions of the power companies about how 'green' they were ring a little hollow.
We used: 334kWh We paid: $105.10
We fed back: 540kWh We were credited: $63.72
Yes, the power companies are getting greener by the day, and why? Because we are supplying them with green electricity at a fraction of the price at which they resell it.
No wonder they're encouraging everyone to install solar power - each installation represents years of guaranteed free income, for the expenditure of absolutely nothing.