The next paragraph is also worth citing (it probably applies to the thermoacoustic Stirling engine as well) "It is also possible to capture the waste heat usin

The next paragraph is also worth citing (it probably applies to the thermoacoustic Stirling engine as well) "It is also possible to capture the waste heat using cogeneration in which the waste heat is used for heating a lower boiling point working fluid or as a heat source for district heating via saturated low-pressure steam." This way (district heating), the power plant in my city achieves 86% overall efficiency.