Options for Ocean-Based Energy 2 nd Maritime Business & Technology Summit
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Transcript of Options for Ocean-Based Energy 2 nd Maritime Business & Technology Summit
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© 2010 San Diego Gas & Electric Company. All copyright and trademark rights reserved
Options for Ocean-Based Options for Ocean-Based EnergyEnergy
22ndnd Maritime Business & Technology Maritime Business & Technology SummitSummit
Frank R. Goodman, Jr.San Diego Gas & Electric Company
November 16, 2010San Diego, CA
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Ocean Energy Options
• Extraction of energy from ocean• Wave energy
• Tidal energy
• Ocean thermal-gradient energy (OTEC)
• Ocean current energy
• Ocean-based wind and solar energy
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Ocean Energy PotentialPhoto courtesy of Pelamis Wave Power
• Wave energy resource estimate for WA, OR, CA is 440 TWh/yr--EPRI and other sources
• Issues for San Diego region• San Diego area is near the
low end of what is available from wave energy, compared to further north on the West Coast
• Wave energy may be better further out
• Ocean current, ocean thermal energy, and tidal resources are modest in the immediate San Diego area
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Offshore Low-Cut-In-Speed Wind Turbines
• Wind resources could contribute to energy needs of an offshore platform
• SDG&E has plans to field test a machine on Harbor Island• Goal is to assess the
economic viability in low winds
• Power available varies as the cube of wind speed
• Issues for San Diego region• Would the winds be any
better offshore?• How far out would you have
to go?• Some inland areas have
better winds
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Offshore Solar Energy
• Solar resources could contribute to the energy needs of an offshore platform
• SDG&E is field testing 4 experimental solar concentrator systems
• Issues for San Diego region• Sunlight improves as you
move away from ocean
• Marine layer greatly limits amount of sunlight available at coast and at sea
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Added Options
• Ocean Algae• Could use nutrients in waste water
• Algae as a transportable fuel
• Use osmosis to confine the growing area
• Osmotic Power
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General Issues That Need to be Addressed for All These Technologies
• Cost of energy• Rigorous business case needed
• Environmental impacts need to be addressed• Aesthetic concerns• Ecological impacts• Impact on navigation and shipping
• Can all the energy be used on a large floating platform?• Would there be a need to get energy to the mainland?• How would it be done?
• Extra attention needed to making the equipment corrosion resistant• Example: A wind turbine that is designed only for inland
use will not survive the corrosion at sea
• Recyclability of the materials at end of life• Who will own the systems? Who will operate and
maintain the systems?
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Questions?