It seems to be clear that heat pumps have a unique role in the energy system of the future. Barely any other energy technology can provide net primary energy savings, economic benefits to the users and reduced climate impact at the same time. The benefit of heat pumps are achieved in several ways; by system integration capabilities tying together different parts of an energy system for enhanced overall energy efficiency, by storage of heat to offset peaks and, if efficient enough, providing the most efficient way to heat buildings from a net primary energy perspective.