Not like an increased cost would in any way balance the ability to get tons of free energy though. But as said, i think you should not use turbines for other high temperature steam sources anyway (or if you can find some, tell me about it so i can balance it, like i did with geothermal). Although i guess i should increase their price anyway since i did the same for the reactors because all the involved entities are basically X times better.
Reactors do output more power, so their increased cost has a reason. They don't output more heat directly, but in the chain of nuclear power production, the same setup with 1 reactor in vanilla that produces 40MW will produce X times the power, however high you set the multiplier in this mod. Having reactors also cost X times as much just makes sense or otherwise this mod wouldn't be as much of a way to try and reduce the UPS cost, but just be cheaty and a buff to nuclear. As it is, you will produce X times as much power but also use X times more fuel cells, and reactors will also cost more so it's almost the same as having several reactors. It's basically just a denser form using fewer entities, so the UPS cost is lower.