Wednesday - November 2, 2016

Partnership Receives $265,220 for Implementing Energy Savings at New Water Treatment Plant

Energy Trust of Oregon representatives, Jay Ward and Kelson Redding present the rebate check to Lake Oswego City Council on November 1.

On November 1, the Lake Oswego Tigard Water Partnership received a $265,220 check from the Energy Trust of Oregon for implementing energy saving features into the new water treatment plant. This included installation of variable frequency drives (VFDs) for the pump motors at the new finished water pump station.

VFDs allow the pump station to minimize energy demands and work more efficiently to achieve the daily flow requirements. The VFDs enable the new pumps to operate at different speeds to match water system demands. In addition, VFDs reduce wear and tear on motors, thereby decreasing maintenance costs and prolonging equipment life.

With the installation of the new VFDs on three pump motors and reduced voltage starters on two motors, the plant reduces its energy consumption footprint by 1.7 million kilowatt hours per year.  

On behalf of the Partnership, Lake Oswego City Council accepted the check presented by the Energy Trust of Oregon at the November 1 Council meeting.

This is the second rebate award the Partnership has received from the Energy Trust of Oregon, for implementing energy saving features into the design and construction of the $254 million water supply system.

Last summer, the Partnership received a rebate check for $83,120 thanks to energy savings accomplished from the VFDs at the new river intake pump station.

Other energy-efficient and green features implemented at the new water treatment plant include:

  • A large solar panel array with 110 panels generates up to 32 kilowatts of power that is used by the plant. When generating capacity exceeds local demand, the excess is delivered back into the utility grid.
  • Garden roofs, bioswales and ponds, as well as pervious driveways and sidewalks reduce storm water runoff and replenish groundwater.
  • Screw presses instead of commonly used centrifuges to dewater plant solids saves approximately 32,000 kilowatt hours per year.
  • Sustainable operational practices including recycling water and sand used in the settling and filtration processes.

For more information about the program’s energy-efficient and sustainable aspects, please visit