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Monty Worthington Director of Project Development - Alaska False Pass Tidal & Ocean Current Resource Reconnaissance Study Presented to SWAMC Southwest Alaska Economic Summit & Membership Meeting March 5, 2014

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2 Contracted by the Aleutian Pribilof Islands Assoc. (APIA), ORPC organized and implemented a tidal current survey at False Pass. Project partners made the study successful: The Aleutian Pribilof Island Community Development Assoc. donated a vessel, captain, room and board. University of Alaska-Anchorage (UAA) performed circulation modeling to identify sites likely to have high current velocities. National Renewable Energy Laboratory loaned Acoustic Doppler Current Profiler (ADCP) and provided field technician to help deploy. Benthic GeoScience was contracted to provide technical and field support during deployment. APIA provided funding via a tribal energy grant received from the US Dept. of Energy. False Pass Reconnaissance Study

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3 Areas likely to have high current velocities and symmetric flow on flood and ebb tides were selected as potential ADCP deployment sites. Selection was also based on UAA modeling, local knowledge, and existing oceanographic data. Candidate Site Selection

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4 A bottom-mounted sonar was deployed to seven sites to assess hazards to successful ADCP deployment and retrieval. Hazard Assessment with Scanning Sonar

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5 600 kHz Acoustic Wave and Current profiler loaned from NREL deployed at northern site offshore from False Pass Harbor 300 kHz ADCP deployed at southern site in narrow con- striction of Isanotski Strait Both deployed with redun- dant recovery systems to enhance recovery proba- bility in harsh high current environment. Recovery scheduled after full lunar cycle (29.5 days) of data collection at end of October. Two sites were selected and ADCPs were deployed.

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6 Water-level sensors deployed at southern and northern boundaries of modeling domain. Model then hindcast to cover ADCP deployment period to assess model validity and provide insight into finer scale location of future ADCP deployments. Two water-level sensors were deployed to enhance UAA circulation model.

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7 ADCPs recovered (with some difficulty!) on October 30 and November 4.

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8 From site S2 (top) and N2 (bottom), 10.5 meters above sea floor Data thru entire water column over deployment period

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9 From S2 (left) and N2 (right) ~ 10.5 meters above seafloor Tide Rose data to assess magnitude and flow symmetry

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10 UAA modeling updated with water level and ADCP data

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11 Using ORPCs TidGen Power System parameters rated at 150kW in a 5.4 knot current Potential Recoverable Energy

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ORPC Power Systems TidGen Power System 150 kW* 2012 OCGen Power System 600kW* 2016 RivGen Power System 25kW* 2014 TidGen TGU Cobscook Bay, Maine Tidal Energy Project Single device TidGen Power System connected to Bangor Hydro electric grid in September 2012. First grid connected hydrokoinetic tidal energy project in the Americas 12

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Cobscook Bay, Maine Tidal Energy Project 13

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Tidal energy technologies around the globe 14

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15 Refine UAA modeling Expand upon resource assessment work Scope environmental issues and complete study plans Perform economic analysis Next steps in development of False Pass tidal current resources

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www.orpc.co 16 Thank You! Questions? Monty Worthington Director of Project Development - Alaska mworthington@orpc.co (907) 339-7939 www.orpc.co