Hydrogen power? Solar power still makes infinitely more sense to me. For 1 thing, you only need to store solar power when you make more than you use. And solar is always there, it's never going away, & it's free for the taking. Hydrogen can blow up. And hydrogen is a vital part of our atmosphere & our water. I'd hate to think what 100 years of 10 billion humans burning hydrogen would do to the balance of our water & the air, of its breathability.
https://www.ecoticias.com/en/hydrogen-teleported-for-first-time-2/7155/
@jjGravitas The problem is battery density and charging speed. Solar is great on the grid when it's productive, but for other times, it's only as good as the storage tech. The storage tech may or may not improve to rise to the needs, but it isn't there yet.
If you're obtaining hydrogen from water, there is little to no long-term problem: burning it produces water.
Hydrogen tech needs significant improvement to be mainstreamed, but it has the potential to solve problems which solar doesn't.
@jjGravitas This is not a particular area of expertise for me. The biggest problems with hydrogen are the extracting it, storing it, and that the hardware used to burn it tends to wear out too quickly. The environmental issue is that hydrogen is most cheaply available from hydrocarbons - fossil fuels - and the existing processes are dirty. Extracting from water is power-intensive, and thus expensive. Depletion of hydrogen or build up in the atmosphere aren't major issues.