Energy Master Plan » Donohue & Associates, Inc. Client: Western Lake Superior Sanitary District Location: Duluth, Minnesota The Western Lake Superior Sanitary District (WLSSD) retained Donohue to collaboratively develop an Energy Master Plan for their wastewater treatment facility. This plan serves as a dynamic and living energy roadmap to guide the District’s transformation to energy independence. This shift is consistent with the national movement for wastewater utilities: shifting from net energy resource consumers to energy producers. The evaluation included a study of current energy use at the 160-million-gallon-per-day wastewater treatment facility and associated costs. Donohue also conducted an extensive evaluation of biogas utilization at the facilities, including using engin

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