If we want to do combustion in a gas turbine as a "battery" for the grid, then electrolysis -> hydrogen -> hydrogen burning gas turbine has a ridiculously superior efficiency and CAPEX compared to going via methane. All the big players for stationary gas turbines are bringing hydrogen as a fuel forward at a rapid rate.

I believe the current plan for the first full-scale hydrogen gas turbine (400+ MW) is the Magnum powerplant in 2025-ish.