Districts
  • During 2010 and 2011, the City of Edmonds Wastewater Treatment Plant participated in an Energy Challenge with Snohomish County PUD and Bonneville Power Administration. During the Energy Challenge, several energy saving projects were identified, evaluated and implemented.
  • Light fixtures at the City’s wastewater treatment plant were retrofitted from standard lighting to high performance lamps and ballasts, CFLs and occupancy sensors. This is estimated to save approximately 56,205 kWH per year, for an annual savings of approximately $4,122.
  • The existing effluent pump outfall lines were modified with larger orifices, reducing the system backpressure and allowing more gravity flow conditions, which reduced pump run times. This is estimated to save approximately 175,489 kWH per year, for an annual savings of approximately $12,109.
  • The existing blowers were replaced with turbo blowers and the dissolved oxygen control was upgraded. Additionally, diffusers were installed in the bottom of the sludge tank to improve aeration. This is estimated to save approximately 451,883 kWH per year, for an annual savings of approximately $26,589.