Trash Heap Energy

An MSNBC article titled One man's garbage, another's power plant fascinated me. The caption for this picture says:

A methane gas collection pipe sticks out of the 1-E landfill in Kearny, N.J. The site is among 21 landfills in New Jersey that convert methane gas produced by decomposing trash into electricity, according to the state Board of Public Utilities.
Apparently, methane from 455 landfills nationwide is being used to power thousands of homes. Why have we not heard of this before? Another example of "green" energy?

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