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When you add solar electric panels to your home, they are typically wired into your existing electrical system via a new meter (often added at no charge by your utility company). This new meter can spin backwards as well as forwards. Now when (for example) you’re out at work all day & not using much power at your house, but the solar system is cranking out electricity, the surplus generated is fed into the grid, making your meter spin backwards. Then when you come home in the evening and you turn on your TV, oven, lights etc. and the meter spins forwards.
The idea is that over a given period (say 1 year) you end up with a ‘net zero’ – or as close to it as you can get – some months (usually peak summer and winter months) you owe the utility company money (albeit a small amount), and in the off-peak months they owe you.
What’s not to like about that?