> if that's profitable to do at house scale, then it's probably even more profitable to do at grid scale There is a reason home generation wins. It's because

> if that's profitable to do at house scale, then it's probably even more profitable to do at grid scale There is a reason home generation wins. It's because retail prices are 3 times what the generator is paid. (That's true where I live). So yes, in absolute terms power generated by home solar costs more than a utility generating it. But it's not 3 times more, so if you install home solar and use the power, it's always a big win. It will be the same with batteries. The traditional forms of generating power, coal, gas, hydro and nuclear only win because home generation costs using those technologies (eg, putting a coal mine and generator in your back year) costs far more than 3 times. You can't put wind, or pumped storage in your back yard either. But solar and batteries are different animals. They are different in other ways too. It always makes sense to over provision solar. The question is not whether to do it, but by how much. So home generators will always be looking to sell power, and since it's free selling it at 1/3 of what they would pay for the same power looks like money for jam to them. It makes you wonder how many utility generators will be left standing if solar takes over the world.