Hydrogen (H2) is generally considered as the energy carrier for a carbon free society. It is easily produced through the electrolysis of water and has a carbon free conversion proces back to electrical power.
But for large scale (TWh) storage, hydrogen is not applicable due to low energy density and physical properties.
This is why EMMET Energy is focussing on another energy carrier that is able to convert electrical energy into molecules and vice versa: methane (CH4).
There is an extensive infrastructure for CH4 (natural gas) in place. So no new infrastructure investments are needed.