Towers in Manhattan Gather Heat for Power

http://www.nytimes.com/2009/02/25/realestate/commercial/25cogen.html?_r=1&ref=science

This article talks about one of the many buildings in Manhattan have began to use energy-efficient power stations known as cogeneration plants (cogens for short). The Landlords of these buildings are doing so because it helps them lower their energy costs. On top of that the cogeneration plants are also considered to be "greener." In 2007, Mayor Bloomberg claimed that the cogens were one of the keys to reducing the city’s greenhouse gas emissions by 30 percent by 2030.