Gas turbine production is fully committed for years to come. There is no way to speed up production quickly. And for manufacturers of turbines, building new production capacity is a highly risky proposition because demand might well evaporate for these things. So they are reluctant to do that.

If you want power quickly, wind, solar, and battery can be planned, installed, and producing power within a couple of years. Nothing else comes close to being that quick. If you want power this decade, that's pretty much the only thing available.