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Rotech Tidal Turbine: Innovative Design and Development for Sustainable Energy in Alaska

The Rotech Tidal Turbine (RTT) represents a breakthrough in tidal energy technology, designed with operation and maintenance (O&M) efficiency in mind. Its unique design features no mechanical gearboxes or complex components, allowing for easy removal and quick installation using a gravity base. The system is modular, enabling rapid replacement of components while minimizing downtime. With demonstrated environmental sensitivity and proven performance in challenging conditions, the RTT is exceptionally suited for Alaskan waters, aiming to enhance renewable energy production while preserving marine ecosystems.

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Rotech Tidal Turbine: Innovative Design and Development for Sustainable Energy in Alaska

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  1. Alaska Presentation • January 2007

  2. The Rotech TidalTurbine – Design DevelopmentInitial Concept • Designed with O&M foremost in mind • Removal of complex components and design • No mechanical Gearboxes, yawing or variable pitch mechanisms • System bi-directional and duct straightens flow allowing for off-turbine axis flows • Gravity Base allows quick installation and little if any seabed preparation • No gearbox allows generation compartment to be hermetically sealed removing risk of leaks • Modular section (cassette) containing all working parts is easily removable and taken to shore for service

  3. The Rotech TidalTurbine – Design DevelopmentAtkins (Mk I design) • Atkins developed initial concept using Oil & Gas Design codes • Full stress and fatigue analysis • Base development including 3-point to contact to remove torsion. • Cheap Ballast (pre-installed) used to make up on-bottom weight needed to prevent sliding • Note the position of the modular ‘cassette’ (the magenta coloured centre unit)

  4. The Rotech TidalTurbine – Design DevelopmentAtkins/Rotech MkII Design • Further development to make duct load bearing to remove tubular support frame • Over 20% costs reduction over initial design - steel requirement reduced and fabrication significantly cheaper • Base still gravity concept (not 3 mono-piles!) • Eloquent design allowing for significant local fabrication and handling

  5. The Rotech TidalTurbine – Design DevelopmentSir Robert McAlpine Commercial (All Concrete) Design • Sir Robert McAlpine commissioned to develop commercial ideas and processes from first principles • Design remarkably similar to Atkins prototype design concept

  6. The Rotech TidalTurbine – Modular Cassette and Generating Pod • Modular unit (cassette) containing turbines, all hydraulics and generating equipment • removed quickly and taken to shore for service • replaced by another unit to minimise down time • Pod seals to prevent leaks and held at atmospheric pressure and temperature to enable components to operate in ‘design’ conditions

  7. Hydraulic Circuit Assembly September - December 2006

  8. TIDAL TEST SITE EMEC Lunar Energy Test Berth Depth: 45 m (150 feet) Flow Peak 7.2 knots (3.7 m/s)

  9. Benefits of using the RTT • Technology Environmentally sensitive • Invisible from above the surface • No impediment to shipping or other social activity • No shoreline equipment required (except connection point) • Environmental credentials proven at EMEC 07/08 • EMEC has significant environmental considerations: Seal sanctuary and whale migration route • RTT has unique opportunity to mitigate issues through screening intake if necessary • RTT is below level of any surface ice and given the minimum 4 year cycle for maintenance, no service required during winter.

  10. RTT and ALASKA • Current RTT design is ideally suited for the Alaskan operating environment “Lunar Energy RTT - Only currently viable deepwater technology design”

  11. Commercial Development • United Kingdom • 2007 Sea trials of the EMEC 1MW unit • 2008/9 Commissioning and fabrication of the first Commercial Units • 2009/10 First demonstration field • 2011/12 First development of first commercial field • International • 2006 June 2006, Developer in New Zealand submitted resource consents application nominating the Lunar Energy RTT device for first commercial tidal stream project (200+MW). • 2007 Negotiations ongoing for initial demonstration projects in Canada and in the US • 2009 Installation and commissioning of projects in Canada; US; and New Zealand • 2010/11 First developments of commercial fields outside UK

  12. www.lunarenergy.co.uk

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