Yes, we are explicitly losing free energy from this. Thing is, the free energy in 60C wastewater is hard to use, and the free energy in 200C steam is much easi

Yes, we are explicitly losing free energy from this. Thing is, the free energy in 60C wastewater is hard to use, and the free energy in 200C steam is much easier to use (through steam-turbines). Hence, it might be worth it to sacrifice a large part of the free energy in the 60C wastewater to get it to a useable form. What are the alternatives to use 60C wastewater to generate electricity? I can think of a sterling engine or a thermoelectric material. These would probably be more efficient, but they are new technologies, with practical limitations and development limitations. Hence, if my idea could generate any form of electricity, it might be more feasible than the other ideas. From what I know about heat engines, I know it might not be possible to generate electricity this way.