From Pipe Leak Detection System Employs Machine Learning to Limit Errors:

Methane Gas Pumping Station
Methane Gas Pumping Station

A methane gas pumping station, where gas from a landfill is recovered, treated, and piped to a power station, according to Flickr user Gene Spesard. Image courtesy of Flickr user Gene Spesard and used in accordance with creative commons license.
Methane gas pumping station