Railgun batteries push warships toward nuclear power

What power source would make multiple naval railguns practical?

Their electrical demand would likely drive designers toward a nuclear power plant.

Multiple railguns require deck space and ammunition volume, but electrical power is the decisive demand. A ship must generate and deliver that power repeatedly at combat rates. Conventional machinery would eventually become the limiting factor in this assessment. A nuclear plant appears the most plausible way to support a substantial railgun battery.