The Eternal Real Estate Challenge: Running Green Every Day

Determining the actual energy savings in a building can be a complicated process. Actual power bills are better compared by kilowatt hour rather than dollar amount, since prices change. This usage should also be compared from one month to the same month in the year before because seasonal changes make adjacent months different. Measurement and verification devices that run for a full calendar year can also aid in determining actual savings.

But an efficient system is only as good as its daily operations.

via The Eternal Real Estate Challenge | The New York Observer.