Consider also using the Energy merit badge class preparation page for clarification and expections when participating in a Scoutmaster Bucky merit badge opportunity (online or in-person).
Biomass digesters or waste-to-energy plants
Cogeneration plants
Fossil fuel power plants
Fuel cells
Geothermal power plants
Nuclear power plants
Solar power systems
Tidal energy, wave energy, or ocean thermal energy conversion devices
Wind turbines