Admiralty Inlet Pilot Tidal Power

(Admiralty Head and Whidbey Island, WA)  Landau Associates provided geotechnical engineering design support for Snohomish County PUD’s tidal energy pilot project as part of the Sound and Sea Technology team. The pilot-scale project studied the viability of using tidal currents to generate electricity. Proposed equipment included two 6m open-center turbines (similar to the OpenHydro turbine in Photo 1) located off Admiralty Head in Puget Sound (200 ft water depth, up to 8 knots current); a power cable to shore; and a control building to house shoreside electrical components and to connect to Puget Sound Energy’s electrical grid on Whidbey Island.

Our scope of services included evaluation of the seafloor surface and subsurface conditions at the proposed turbine locations based on mapped geologic information and site-specific geophysical data to support preparation of the preliminary turbine design report and FERC Application; characterization of subsurface conditions along the horizontal directionally-drilled (HDD) bore path for the nearshore portion of the power cable; and development of geotechnical engineering recommendations to support foundation design of the shoreside control building.

Photo 1: OpenHydro