Given the roundtrip efficiencies of Power to Hydrogen and Power to Methane as storage methods for the electrical power industry, how can it ever make economic sense to use them in lieu of batteries or pumped storage?

Using electricity to make fuels and reconverting the fuels back to electricity will return at best less than 50% of the energy sent to storage back to the electric grid with today’s technology. Battery and pumped hydro storage is in the range of 85-95% efficient. The...