https://extension.psu.edu/energy/renewable-and-alternative-energy/energy-use-and-efficiency
Renewable Energy: Use and Efficiency | Penn State Extension
Find information on renewable and alternative energy usage and efficiency. Learn about biomass heating, as well as greenhouse and farm energy efficiency.
energy use and efficiencypenn staterenewableextension
https://www.sintef.no/en/publications/publication/2201437/
Energy use and energy efficiency in cruise ship hotel systems in a Nordic climate - SINTEF
energy use and efficiency