Recently I had some solar panels installed. I’m not really sure why other than the feel good factor. We have green power anyway, so we are not really saving carbon, the solar panels have had their carbon credits sold to someone else (before I got them) so someone else is claiming the carbon back anyway and they have an estimated payback period of about 18 years (even after the $8000 government rebate which I got in before the new means test.)
Anyway, its fun to look at the meter and measure how much we are generating. Any spare is just being passed back to the grid and can actually make the meters spin backwards.