By DEQ Grants and Loans Program

Upgrades to the city of Coeur d’Alene wastewater treatment plant will save the city almost 858,100kW-hr and $55,860 per year. The energy savings is equal to the total annual power needs of 70 homes or the annual lighting needs of 700 residences.

The upgrades were made possible with a low-interest loan from the Idaho Department of Environmental Quality State Revolving Fund (SRF). The SRF loan process emphasizes reductions to operations and maintenance costs.

The savings come from the installation of energy-efficient 'green' options the city chose to fund when upgrading their wastewater treatment facility, in lieu of the more energy-intensive alternatives available. Substantial cost savings from reduced energy bills will rapidly offset the initial cost difference of the 'green' components. Coeur d’Alene can expect over $2.2 million in cost savings over the 40-year life of the facility due to the energy-efficient treatment of city wastewater.

Investigation required by the SRF Green Project Reserve Program revealed opportunities to upgrade the system that would provide additional energy and money savings. City consultants recommended installing a combination of fine bubble aerators, high speed turbo blowers, and dissolved oxygen control, to reduce aeration power demand by approximately 71 percent.

In addition, all new pumps and blowers were equipped with Variable Frequency Drives and premium energy-efficient motors to conserve energy and enhance the operability of the treatment process.

To learn more about grants and loans available to wastewater and drinking water systems, visit our Grants and Loans webpage.