Reykjavik Energy (RE) produces renewable energy, electricity, and hot water, from sources such as geothermal energy and hydropower. RE utilises about 12% of produced electricity and a little under 1% of its hot water production for its own operations.

Fossil fuels, particularly diesel oil and methane, are used during construction activities and RE's operations.

The proportion of electricity use and hot water use by Reykjavik Energy is 98.1%, and use of fossil fuels and methane is 1.9%.