Also powerplants are quite (relatively) efficient in terms of heat-to-energy output, often >50% afair. So a 1GW power plant will generate something like 2GW of

Also powerplants are quite (relatively) efficient in terms of heat-to-energy output, often >50% afair. So a 1GW power plant will generate something like 2GW of heat (or less), not 30GW.