> It's most certainly not, since for every kW of installed renewables another kW of gas capacity must be installed to compensate for intermittency.

Why? Built geographically decoupled production, look at past weather data and pick how many 9's up-time you want.

Then use storage and smart consumers to lower the requirements.

For national emergencies keep a fossil reserve or whatever, with that kind of usage power 2 gas should not even matter.