Gas peaker plants are not "the alternative" to nuclear power, they are exactly what nuclear power needs, too, because regulating nuclear plants down is not what you wanna do after investing billions into it-- you
need those plants running on full tilt for like 90% of the time, and even then its gonna take decades to pay back the investment.
Meanwhile, 1kW of solar with 1kWh of storage can be had for $1k on Amazon, yields 1-2MWh per year and pays for itself within the decade, with costs still trending down. Yes, fully getting rid of fossil gas is an ongoing challenge, but a much easier one than ramping up nuclear reactor build rates by a factor of 1000 or so...