SDG&E is required to have a certain percentage of their power from renewable sources so when you put a solar system in, they get credit for the power your system produces in terms of meeting their “green” requirements. It is not exactly a win win because you are reimbursed for your power at a lower rate than what is generally charged, but for us, it still beat the high bills in the summer. We also have window tinting, use the energy saver light bulbs and we have a lot of trees to provide shade for the house. Solar is still expensive, but there are many companies out there and it is getting more and more competitive and the panels have improved.