Energy Currencies are currencies valued by units of energy production. By linking to environmentally sustainable energy sources (solar, wind, hydro, etc), energy currencies seek both to boost local economies and contribute to a transition towards a more ecologically friendly economy.
See more at: http://www.appropedia.org/Energy_currency
Energising Money. An Introduction to Energy Currencies and Accounting.
nef report written by Josh Ryan-Collins, Tony Greenham, Leander Bindewald and Ludwig Schuster, Feb 2013. Download at http://www.neweconomics.org/publications/entry/energising-money