This is very interesting. I'm in the process of installing 8.6kw system and my biggest interest is storing all this energy. Tesla powerwall comes to mind but pricey.
Recently I was in a remote area of Baja Sur in Mexico and they are completely off grid. About 100 population and they store in DC packs somewhere. So you can watch TV, whatever at night. Awesome system. At least wind is available at night, just put them in the right places.
I will probably go with a natural gas generator as my back up vs. battery but the battery option is just so tempting. I'm surprised coal is still being utilized when natural gas is so much easier to move around. I do have natural gas now for cooking, heating, etc.
BTW, I bought my system, not leased.