Mora WWT

Mora Wastewater Treatment Plant aeration ditches with clarifiers and control building in background.


Mora Municipal Utilities completed an energy efficiency project saving the city money by optimizing operations without any capital investment. This project was a result of a partnership with the University of Minnesota Technical Assistance Program to evaluate low cost energy saving opportunities at wastewater treatment plants across the state. 

The Mora WWTP underwent a significant infrastructure upgrade in 2017. While that upgrade positioned the city to maintain high levels of water quality, it also increased the capacity for future growth of the community. That presented a challenge because the new equipment was oversized for current wastewater loads and resulted in wasted energy. 

That oversizing presented MMU with opportunities to fine tune the operations to save energy based on current plant loading. Working with MnTAP, MMU staff was able to reduce the run time for the digester blower. It is estimated that will save the facility $1,700 annually in electricity costs. Joe Kolhgraf, Public Works Director, says opportunities like these are part of an on-going effort to fine tune operations to save energy and reduce waste.

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