For long term storage most countries will need more than pumping hydro. But green hydrogen can be produced from wind and solar to use in times of need in claasic power plants adapted for hydrogen. This technology also exists. But it is very inefficient, so should and will he used only as a backup.
For long term storage most countries will need more than pumping hydro. But green hydrogen can be produced from wind and solar to use in times of need in claasic power plants adapted for hydrogen. This technology also exists. But it is very inefficient, so should and will he used only as a backup.
Hydrogen is also a huge pain to store. It’s really hard to keep it from leaking.
But it can be stored as Methane in exactly those containers that many countries already have at a large scale for their winters.