Though, this only really makes sense on a nuclear-powered ship. You've got to store your energy somehow, and I'm sure gunpowder is less energy-dense than diesel

Though, this only really makes sense on a nuclear-powered ship. You've got to store your energy somehow, and I'm sure gunpowder is less energy-dense than diesel fuel, but from what I've read one of the big attractions of electric weapons is that you can replace all that chemical energy storage with far, far denser nuclear energy.