The key to this concept is decentralization. Solar power will take off when someone develops relatively cheap and reliable systems that can be easily attached to individual homes and businesses. Every watt that comes from something like this is a watt that the power plants don't have to generate. In some cold, cloudy climates, solar isn't that practical. In other hot, sunny climates, it works quite well, even if it's just to blunt peak power loads during the height of air conditioning use. Coincidentally, those peak times happen to be the sunniest.

This concept has even more potential because it generates hydrogen, not just electricity. It should be possible to store excess hydrogen (perhaps in hydrides) and use it in the system's fuel cells when the sun isn't shining. A hydrogen distribution system is trickier than natural gas.

Once an idea takes off, the manufacturing and design (as with computers) will get simpler and cheaper. Really good ideas don't need subsidies. Did you notice that the idea of miniature local nuclear power systems is getting private investment whereas the giant centralized ones have more problems?