Comment Why grid-tied home solar is unsustainable (Score 1) 245
The theory behind grid-tied home solar systems is that you can give your surplus power to the utility company who will give you credit in return for times when you need more power than you are generating. In effect, you are using the utility company as your storage battery, so you don't have to buy and maintain your own. This only works as long as there are always enough customers paying for electricity rather than generating their own. Eventually it's no longer cost effective for the utility company to provide storage service for free. They make their money charging for electricity, but if enough people only need them to store it temporarily, they are going to have to start charging for that service.