The only feasible way to do that is to use the hydrogen at the source of production to make methane, using direct air capture and reduction of CO2 (Sabatier pro

The only feasible way to do that is to use the hydrogen at the source of production to make methane, using direct air capture and reduction of CO2 (Sabatier process) as the carbon source. This is because existing methane pipelines would be embrittled by hydrogen and would soon fail, with disastrous consequences. Hydrogen from electrolysis is best viewed as an intermediate feedstock for further chemical synthesis, as with ammonia production, methane production, jet fuel production, etc. There is perhaps potential for dumping excess grid electricity into hydrogen storage tanks at power plants as a temporary storage system, i.e. converting the hydrogen back to electricity via fuels cells (not turbines!) to meet electrical demand later. Hydrogen storage requires special alloys to avoid steel embrittlement however, so it's fairly expensive.