Aeronaut,
Small nit to pick. Megawatts are a unit of power, which is a rate (like velocity), for 13 MW-hr is a measure of energy (like distance) and 13 MW/hr is a rate of change (like acceleration). Steam power plants have load change limits, typically around 5 MW/min change in output.
Yes, cheap electric power would be a god-send to the primary metals industry. Electro refinining, such as for copper, and as a sorce of heat for casting plants, etc.
Also, waste could be reduce using a plama arc furnace, turning it into fully oxidized gases and glass slag. So, so many things become possible and/or cheap if the power is cheap….
FF would be the next best thing to “Friendly Aliens” providing us with high tech……remember “To Serve Man”….(Twilight Zone episode, google it.)