Fuel cells are only useful for automotive applications, on the grid you want combined cycle gas turbines which are cheaper and more efficient. That still only gets round trip efficiency to about 25%.
You are thinking of natural gas fueled turbines, you can also burn hydrogen in gas turbines. If that hydrogen was produced domestically via electrolysis using clean sources there isn’t any strategic issues.
Also, from a strategic perspective burning domestic natural gas and burning natural gas from a different country are very different things. Europe becoming dependent on Russian natural gas was stupid, but America burning it’s domestic natural gas is mostly just an environmental issue.
