2 ms·
I always wonder how the thermal efficiency of these whole system compares to something as mechanical as pumped hydro. Feels like many developments dance around
by ishortit 4y ago
I always wonder how the thermal efficiency of these whole system compares to something as mechanical as pumped hydro.
Feels like many developments dance around the fact no one has a good way to actually *generate* the H2 cleanly.
Best I’ve seen is a gallium compound electrolysis, ignoring so called “blue” (black) hydrogen from natgas.
- philipkglass 4y agoThis project will use water electrolysis powered by renewable electricity for clean hydrogen generation: https://www.energy.gov/lpo/advanced-clean-energy-storage https://www.energy.gov/lpo/advanced-clean-energy-storage As of 2017 the US had about 250 GWH of pumped-storage capacity and the world had about 1600 GWH: https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricity https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricit... So this one project can store more energy than all American pumped-storage projects. Pumped-storage is more efficient but it takes much more mass because gravity is such a weak force.