You can't build 2x the generation capacity (which is what you're suggesting) at economic prices anyone would today consider reasonable. Remember you have to be

You can't build 2x the generation capacity (which is what you're suggesting) at economic prices anyone would today consider reasonable. Remember you have to be able to cover 100% of demand from non-renewable sources. It's not just the gas plants, it's the pipeline network, the gas wells, the LNG import terminals, the ships, the whole shebang. It's extremely expensive to have it available but not actually use it.