Fact: Solar Power doesn't work when it's dark.
Solar roof top hot water tanks have been around for years.
Battery technology has progressed a lot.
Telsa's power panel idea will have a future.
Solar power for the grid is limited in nature. Power grids distribute electricity not store it.
https://en.wikipedia.org/wiki/Osmotic_power
Invest in osmotic power -- the potential is enormous
Once you have a cheap source of electricity you can make hydrogen for fuel.