"And maybe the decay heat can become useful, too."
Heat is always useful. To generate electricity profitably, it takes a fair amount of Delta-T. To grow bananas in a hothouse, far less. Siting things that can use the waste heat nearby should be something always looked at for any thermal power plant. Some crops are very sensitive to frost. Citrus could be grown in many areas if the ground was heated and the area around the trees was warm enough to keep above freezing. Iceland is a good example. They do a lot of heating of things with the waste heat from their geothermal plants.
Biting the hand that feeds IT
