'Negawatt power'

'Negawatt power is a theoretical unit of power representoing an amount of energy (measured in watts) saved. The energy saved is a direct result of energys conservation or increased efficiency. The term was coined by the Chief Scientist of the Rocky Mountain Institute and environmentalist, Amory Lovins in 1989. Negawatts currently cannot be precisely measured, only theoretically. However there is some controversy surrounding the negawatt Market.
A negawatt market can be thought of as a Secondary market, in which electricity is allocated from one consumer to another consumer within the Energy market. In this market, negawatts could be treated as a Commodity. Commodities have the ability to be traded across time and space, which would allow negawatts to be incorporated in the international trading system. However, creating negawatt markets would be very difficult to achieve on a large-scale.'

source: http://en.wikipedia.org/wiki/Negawatt_power