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Southeast Alaska Tidal In-Stream Energy Resources

Southeast Alaska Tidal In-Stream Energy Resources. Southeast Alaska. January 23, 2007 Roger Bedard/ EPRI Ocean Energy Leader Brian Polagye/ University of Washington. Summary. An Assessment of the In-Stream Tidal Energy Resources in SE Alaska Cross sectional area (m 2 )

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Southeast Alaska Tidal In-Stream Energy Resources

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  1. Southeast Alaska Tidal In-Stream Energy Resources Southeast Alaska January 23, 2007 Roger Bedard/ EPRI Ocean Energy Leader Brian Polagye/ University of Washington

  2. Summary • An Assessment of the In-Stream Tidal Energy Resources in SE Alaska • Cross sectional area (m2) • Average depth (m) • Power density (kW/m2) • Total kinetic power in the stream (MW) • Glacier and Lituya Bays excluded (within Glacier National Park) • Cross Sound and Icy Strait show a massive energy potential • Many high quality (high power density), small (low average annual power) sites could provide power for remote locations • Recommend next steps for Alaska are • Site feasibility and economic assessments • Detailed resource measurements and modelling • Consider Cross Sound and Icy Strait in transmission intertie studies • Consider environmental sensitivity, particularly need for studying the potential impacts on migrating salmon and whales

  3. Tidal Sites in 2005/2006 EPRI North America Collaborative Study Minas Passage NS Knik Arm AK Head Harbor Passage NB Tacoma Narrows WA Western Passage ME Golden Gate SF CA Muskeget Channel MA

  4. Available Tidal In-Stream Power at EPRI 2005/2006 Study Sites AK WA CA MA ME NB NS Cross-sectional area (m2) 72,500 62,600 74,700 17,500 36,000 60,000 225,000 Power Density (kW/m2) (annual depth averaged) 1.6 1.7 3.2 0.95 2.9 0.94 4.5 Total kinetic power in the stream (MW) (annual depth averaged) 116 106 237 13.3 104 56 1,013

  5. Very Late 2006 SE Alaska Tidal In Stream Resource Study • Alaska Energy Authority (AEA) contracted EPRI to assess the In-Stream Tidal Energy Resources in SE Alaska • Cross sectional area (m2) • Average depth (m) • Power density (kW/m2) (annual depth averaged) • Total kinetic power in the stream (MW) (annual depth averaged) • Glacier and Lituya Bays excluded (within Glacier National Park) • EPRI Report EPRI TP – 003 – SE AK is posted under the Tidal Page at www.epri.com/oceanenergy/

  6. Where are the Sites Relative to the Transmission Lines? Cross Sound and Icy Strait Kootzhanoo Inlet Wrangell Narrows Sergius Narrows TonowekNarrows Tlevak Narrows Felice Strait

  7. Cross Sound and Icy Strait Sites North Passage 1.3 kW/m2 480 MW Gustavus Glacier National Park North Inian Pass 2.5 kW/m2 1600 MW Icy Strait Lemesurier Island Elfin Cove South Passage 0.9 kW/m2 420 MW Cross Sound Chichagof Island South Inian Pass 4.3 kW/m2 150 MW Large resource Strong currents Small resource Weaker currents

  8. South Inian Pass Site and Bathymetry South Inian Pass

  9. South Inian Pass In Stream Power

  10. South Inian Pass Site Characteristics Site Characteristics Channel Width 720 m Average Depth (MLLW reference) 46 m Deepest Point (MLLW reference) 86 m Average Cross-sectional Area 34,000 m2 Maximum Surface Current 4.9 m/s Tidal Energy Statistics Depth Average Power Density 4.3 kW/m2 Average Power Available 150 MW

  11. Prince of Wales Island and Wrangell Narrows Sites Mainland Petersburg Turn Point 1.8 kW/m2 9 MW Tonowek Narrows 0.7 kW/m2 11 MW Prince of Wales Island Kupreanof Island Foul with mud and rocks Craig Mitkof Island South Ledge 2.6 kW/m2 12 MW Tlevak Narrows 1.5 kW/m2 18 MW Keene Island Spike Rock 2.6 kW/m2 9 MW Large resource Strong currents Small resource Weaker currents

  12. Wrangell Narrows Power and Bathymetry

  13. Chatham and Peril Strait Sites Kootznahoo Inlet 7.4 kW/m2 23 MW Chichagof Island Mitchell Bay Angoon Large resource Strong currents Chatham Strait Admiralty Island Small resource Weaker currents Chatham Strait Peril Strait Chichagof Island Sergius Narrows 4.5 kW/m2 25 MW Baranof Island

  14. SE Alaska Site Resource Summary

  15. SE Alaska Site Commercial Potential

  16. Conclusions and Recommendations • Cross Sound and Icy Strait show a massive energy potential • High quality (high power density), small (low average annual power) sites could provide power for remote locations • EPRI Report EPRI TP – 003 – SE AK is posted under the Tidal Page at www.epri.com/oceanenergy • Next steps for Alaska are • Site feasibility and economic assessments • Detailed resource measurements and modelling • Consider Cross Sound and Icy Strait in Transmission Intertie studies • Consider environmental sensitivity, particularly need for studying the potential impacts on migrating salmon and whales • Do what is needed to attract private investors

  17. Thank you Roger Bedard Ph: 650-855-2131 Email: rbedard@epri.com

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