Waldron Island and President Channel seen from Orcas Island, Washington. Photo by Somelab
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Denny Substation Project
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Seattle City Light's environmental consultant (ESA, Inc.) has completed preparation of the Final Environmental Impact Statement (EIS). Review and download the Draft EIS and Final EIS.

The Final EIS expands on the Draft EIS (issued March 27, 2014). Together these documents comprise the "Denny Substation Project EIS" and should be read in tandem for a full understanding of the project's likely environmental impacts and proposed mitigation.

The Final EIS volume includes:
  • additional analysis on several topics (noise and land use for example),
  • a summary of probable adverse impacts for all project components,
  • responses to public and agency comments on the Draft EIS, and
  • a list of commitments and actions that City Light now proposes to avoid, minimize, or otherwise mitigate environmental impacts where possible.
Major conclusions of the EIS analysis include that there are no unavoidable significant adverse environmental impacts that would result from long term operation of the project. However, there are unavoidable noise impacts that would likely occur during construction. Chapters 1 and 5 of the Final EIS describe this issue in more detail.

With completion of the Final EIS, City Light will seek approval of the preferred substation alternative. A preferred transmission alternative has not yet been identified, and will be determined based on additional engineering information.

After full consideration of the EIS and permit applications, responsible agencies and advisory bodies can begin making decisions and recommendations on the project before final approval by the Seattle City Council.

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