Technology

This method of electricity generation involves the capture and conditioning of gas generated by decomposing landfill or biomass. Traditionally, the gas generated by the decomposition process, at a landfill for example, was either vented to the air or flared.

In a typical landfill, the composition of the gas is approximately 50% Methane (CH4), and 50% Carbon Dioxide (CO2), with some trace emissions. To generate electricity, the gas is collected in a network of collection pipes, processed (generally cooled to remove moisture) and typically fed to a reciprocating engine or turbine, and generator pair. In addition to generating electricity, the capture of landfill and biomass gas reduces landfill emissions that contribute to global warming. Methane has a global warming potential 21 times that of carbon dioxide.¹ 

     
         Eastview Landfill Gas Energy Plant - Courtesy of Guelph Hydro. Used with permission.

1. National Office of Pollution Prevention, Landfill Gas Emissions: http://www.ec.gc.ca/nopp/lfg/primer/en/primer.cfm?pg=6

Bio-energy

As of December 31, 2009, the OPA is managing 91 MW of bio-energy contracts. 

In Commercial Operation

Eastview Landfill Gas Energy Plant (2.5 MW) - Guelph 

Hamilton (Digester Gas) Cogeneration Plant (1.6 MW) - Hamilton

Trail Road Landfill Generating Facility (5.0 MW) - Ottawa