MHK Technologies/SeaGen

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Technology Profile
Primary Organization Marine Current Turbines Ltd
Project(s) where this technology is utilized MHK Projects/Seaflow Tidal Energy System
MHK Projects/SeaGen 2
MHK Projects/SeaGen KyleRhea
MHK Projects/Seagen Strangford
MHK Projects/The Skerries
Technology Resource
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Technology Type
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Axial Flow Turbine
Technology Readiness Level
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TRL 9: Commercial-Scale Production / Application
Technology Description Two 16m diameter rotors mounted on a steel cross beam

Mooring Configuration Jacketed quadrapod structure with 4 pinpiles each of 1m diameter penetrating 9m into bedrock. SeaGen can also be supplied on a 3.5m monopile and its predecessor the 300kW Seaflow was installed on a 2.1m diameter monopile.
Optimum Marine/Riverline Conditions Rated velocity is 2 4m s for SeaGen prototype but this can be re set at any value between 2 0 and 2 5m s depending on site conditions Through use of pitch control power is limited to rated level With 16m diameter rotors the minimum water depth is 22m and the maximum convenient depth is 40m We have systems under development that could operate in either shallower water possibly down to 10m and deeper water up to 60m

Technology Dimensions
Length (m) 9
Width (m) 29
Height (m) 37
Freeboard (m) 10.5
Draft (m) 25

Technology Nameplate Capacity (MW) 1 2MW rated power for SeaGen prototype Production model will be 1 5MW
Device Testing
Scale Test •As mentioned before they ran a small proof of concept test system back in 1994 3 5m rotor 15kW which they believe was the world s first tidal turbine They ran a 300kW 11m rotor experimental test rig called Seaflow since 2003 which was and still is the only tidal turbine world wide in a truly offshore location Neither was a model as such of our commercial SeaGen technology but they both tested various key elements for example pitch controlled axial flow rotors and the necessary dcontrol systems

Full-Scale Test •SeaGen achieved its rated power of 1 2MW for the first time in December 2008 and is fully operational at the time of writing Generated electricity is being sold and SeaGen is officially accredited as the UK s first marine generating station with the UK grid authority OFGE

Relevant Technical Publications •Fraenkel, P. L., “Marine Current Turbines: pioneering the development of marine kinetic energy converters”, Journal of Power and Energy , Proc. of I Mech E, Vol. 221 Part A., London, April 2007

Tidal energy system on full power , BBC News Channel, Dec 18, 2008 - see Fraenkel, P. L., “Marine Current Turbines: Moving From Experimental Test Rigs To A Commercial Technology” (OMAE2007-29642), 26th International Conference on Offshore Mechanics & Arctic Engineering, June 10-15, 2007, San Diego, USA Fraenkel, P. L.,“Tidal Current Energy Technologies”, invited paper by RSPB, British Ornithological Union Conference, 1-3 April 2005, University of Leicester, published in Ibis Environmental Impact Summary document called "Strangford_Lough_EIA_summary.PDF", Royal Haskoning and Marine Current Turbines Ltd., 2005 Fraenkel, P. L., “Marine Current Turbines: solving engineering challenges to capture energy from the seas” Energy Ocean 2005 - Washington DC - April 26-28, 2005

Date Submitted 10/8/2010

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