"A small but growing number of commercial landlords in New York are installing energy-efficient power stationsknown as cogeneration plants, or cogens for short. Unlike conventional power stations, which let excess heat dissipate into the air as exhaust, cogens reuse that cast-off energy for heating and cooling. Given the improved efficiency, combined with government incentives and rising electricity costs, some landlords are now finding it cost-effective to install cogens and generate their own power."...
http://www.nytimes.com/2009/02/25/realestate/commercial/25cogen.html?ref=science
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