Cloud Factory

Bellefield Boiler Plant, also known as "The Cloud Factory" from its nickname's use in Michael Chabon's 1988 debut novel The Mysteries of Pittsburgh, is a boiler plant located in Junction Hollow (referred to as "The Lost Neighborhood" in Chabon's book) between the Carnegie Institute of Pittsburgh and Carnegie Mellon University in the Oakland district of Pittsburgh, Pennsylvania.

Built in 1907 to provide steam heat for Carnegie Museum, it was designed in the Romanesque Revival style by the architectural firm Longfellow, Alden & Harlow. The 1907 smoke stack measured 150 feet (removed in 2010), and the newer stack (unknown built year) is more than 200 feet. The plant has burned both coal and natural gas but stopped burning coal on July 1, 2009. Its steam system expanded in the 1930s to service the University of Pittsburgh's Cathedral of Learning. Today it pumps heat to most of the major buildings in Oakland. It is owned by a consortium made up of the University of Pittsburgh, University of Pittsburgh Medical Center, Carnegie Mellon University, the Carnegie Museum, the City of Pittsburgh, and the Pittsburgh Public Schools.