References:

https://en.wikipedia.org/wiki/Biofuel

https://en.wikipedia.org/wiki/Electricity_meter

https://en.wikipedia.org/wiki/Methane

https://en.wikipedia.org/wiki/Propane

USGBC

https://www.usgbc.org/

https://en.wikipedia.org/wiki/U.S._Green_Building_Council

LEED v4 Reference Guide-BD+C (ISBN: 978-1-932444-18-6)