Hydrogen Generation?

So, other than nuclear and excess renewables, how will we get the energy to power hydrogen economy?

Storage is pretty cheap and standardized (thanks to Type 4 tanks). They leak less energy than traditional gas tanks. They're also much cheaper per kwh in energy storage than even the cheapest battery.

Really, the problem with hydrogen economy isn't the storage or even the fuel cell stack. It's the generation.

I've seen some biological production methods, but I don't think they produce very fast. Normally, they're just an inefficient version of solar energy capture.