Biogas is a by-product created during the digestion of solids removed in the wastewater treatment process.  Digestion of the solids occur in three digesters. These biogases are composed of approximately 65 percent methane, 35 percent carbon dioxide and trace amounts of hydrogen sulphide. At the Saskatoon Wastewater Treatment Plant the biogas is captured and used as a fuel for the boilers to heat the many buildings and the digesters on site.

By using the energy from biogas, the Wastewater Treatment Plant saves approximately $300,000 a year in heating costs and reduces greenhouse gas emissions.

There are several wastewater treatment plants in North America that are using the biogas produced in their treatment process to generate electricity by powering small turbines. The use of biogas for electrical generation is being investigated at the Saskatoon Wastewater Treatment Plant as part of the City of Saskatoon's ongoing environmental commitment.