An opportunity I see is retrofitting a low voltage power distribution system within homes as part of the retrofit. Solar and batteries are already direct current and that's what digital electronics use...wall wart transformers are a kludge, directly plugging in the USB cable that charges my phone makes more sense.
At the extreme end, a system with solar cells and batteries that only serves digital electronics might be the MVP for the One to Zero market.
At the extreme end, a system with solar cells and batteries that only serves digital electronics might be the MVP for the One to Zero market.