This is a good idea. It is basically telling your electric company to use only solar energy to provide electricity to your connected appliances. The way I understand it, the energy consumed by that particular outlet will be taken from the credit bank of solar panel. The idea is good, but if you are like me, you use 100 % of the energy of your panel and don’t have any credits for excess to give to your energy company for others to use. Also, I have to get it a 0 to usefulness, as it will only make a difference if enough people use them, but it will help you save energy, money or provide you with electricity is the grill goes down.