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tidal power

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Minesto has together with German tidal turbine manufacturer Schottel Hydro completed the turbine design of Minesto’s tidal power plant Deep Green. The Swedish marine energy company has now placed an order for a prototype of the turbine, with delivery in early 2017.

The order of the so-called Power Take Off system is the first result of the strategic technology partnership between Minesto and Schottel Hydro, which began in December 2015. During 2016 and 2017, Schottel Hydro will deliver a customised turbine solution which will optimally fit the requirements of Deep Green, Minesto’s tidal power plant.

Compared with the first generation Deep Green, the turbine’s performance has been improved by about 10 percent. The development of the turbine has, among other things, resulted in a larger rotor diameter. The rotor now has five blades instead of three. The design has been established anddeepgreenpartswi1 verified through model tests by German Schiffbau Versuchsanstalt in Potsdam.

The model scale tests prove the turbines performance and cavitation behavior to be advantageous compared to previous designs.

The development of Deep Green now enters the next phase where the design of the full-scale system will be completed. At Schottel Hydro the manufacturing of the prototype and the factory acceptance test will be tackled.

In parallel with the final design Minesto will procure subsystems and components which will be assembled into a first full-scale demonstrator. It will then undergo final functionality testing. After that, Deep Green will be implemented in full scale on the offshore facility in Wales during 2017.

 

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Cape Sharp Tidal, a joint venture between Emera and OpenHydro, has completed two significant milestone operations in preparation for the next phase of the tidal energy demonstration project – the installation of its subsea power cable and the launch of its deployment barge.

The operation to lay the Cape Sharp Tidal interconnection cable is the first project component to be deployed, and the only system of its kind in the world. The operation was completed during a single tidal cycle, while holding position over Cape Sharp Tidal’s berth site at the Fundy Ocean Research Centre for Energy (FORCE) near Parrsboro, Nova Scotia.

With support from its marine operations partner, Atlantic Towing Ltd., Cape Sharp Tidal deployed 300 metres of power and fibre-optic data cable from a specially-outfitted barge. Teams also recovered and lifted the existing 16MW subsea export cable installed by FORCE , and using an on-deck mating table, linked it to the Cape Sharp’s interconnection hub. The whole system was placed back on the sea floor, where the cables will remain until Spring 2016, when the turbines are scheduled for deployment.

The Scotia Tide barge, designed by OpenHydro, a DCNS Company, built by Aecon Group in Pictou, took its maiden test voyage around the Pictou Harbour on the weekend. The unique, catamaran style vessel is the largest heavy lift capacity barge in Atlantic Canada. The 64-metre long, 37-metre wide, 650-tonne barge has a 1,150-tonne carrying capacity. Purpose-built for deployment and recovery operations, The Scotia Tide is equipped with three heavy-lift winches that give it a unique capacity to lower and raise turbines from the sea floor. Cape Sharp Tidal’s 1,000-tonne turbines will be towed from Pictou Harbour to the FORCE test site in Parrsboro next spring.Cable-Installation-2-baja

Cape Sharp Tidal’s other significant project milestones include:

  • Manufacturing and assembly of turbine #1 expected to be complete by the end of the year
  • Established a robust Environmental Effects Monitoring Program to demonstrate tidal is a safe and sustainable energy source
  • Engaging local communities around the Bay of Fundy to earn public support for the project
  • Collaborating with local and international research partnerships to track, monitor and analyse post-deployment data

Cape Sharp Tidal plans to install two 2-megawatt in-stream tidal turbines in 2016, North America’s first commercial scale grid-connected tidal array. It will be the first developer to demonstrate its technology at the FORCE test site. The project is the first step toward demonstrating that in-stream tidal energy development is an opportunity for Nova Scotia and Canada to establish a thriving tidal industry and be a global leader in an emerging market.

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