Comment by pydry

The last ~4% or so when the sun isnt shining, the wind isnt blowing, the batteries and pumped storage are depleted can be supplied via power2gas.

Unlike pumped storage and batteries, Power2gas has poor round trip efficiency (40%) but unlike them gas is a very cost effective way to store large amounts of energy for long periods of time.

The ironic thing is that even if we produced all our power in this inefficient way and not just 4% it would still be a bit cheaper than nuclear power.

Until natural gas extraction is taxed or banned, though, power2gas probably wont be cost effective. Natural gas is too cheap even with all the wars.