A website called less-en.org is an Urban land Institute creation that has a British focus but contains information that could be worth a look for anyone who's trying to reduce energy consumption in buildings they design and construct.
The name of the site derives from its catch phrase, "Lessen Confusion, lessen Consumption, Lessen Cost."
As the U.S.-based ULI puts it, "LessEn is a ULI initiative to encourage better energy efficiency in non-domestic buildings."