European Marine Energy Centre
The European Marine Energy Centre (EMEC) Ltd is a UKAS accredited test and research centre focusing on wave and tidal power development based in the Orkney Islands, UK. The Centre provides developers with the opportunity to test full-scale grid-connected prototype devices in unrivalled wave and tidal conditions. The operations are spread over five sites:
- Billia Croo wave energy test site, Mainland (wave power)
- Fall of Warness tidal energy test site, off the island of Eday (tidal power)
- Scale wave test site at Scapa Flow, off St Mary’s Bay
- Scale tidal test site at Shapinsay Sound, off Head of Holland
- Stromness (office and data facilities)
EMEC was established by a grouping of public sector organisations following a recommendation by the House of Commons Science and Technology Committee in 2001. The centre offers, apart from access to water with high wave and tidal energy potential, various kinds of support regarding regulatory issues, grid connection and meteorological monitoring as well as local research and engineering support.
Wave power testing at EMEC
EMEC’s wave test facility is placed on the western edge of the Orkney mainland, in an area with one of the highest wave energy potentials in Europe. The exposed North Sea location means the island group is subjected to the powerful dynamic forces of the North Atlantic Ocean. Construction of the wave test facility was completed in October 2003, and operational activities commenced shortly thereafter. The centre's facilities consist of five test berths situated along the 50m water depth contour off Billia Croo, Stromness on the Orkney mainland (some 2 km offshore) and two shallow water berths situated close to the substation.
The following have been installed:
- Pelamis Wave Power (PWP) installed its prototype Pelamis 750 device on site for full-scale testing in August 2004. This wave energy conversion machine was the first in the world to generate electricity into a grid system from offshore wave energy. To date PWP has continued to undertake various tests as part of its ongoing development programme.
- Scottish Power and Pelamis Wave Power are working in co-operation and are testing a second-generation Pelamis P-2 devices in conjunction with a second P2 device, previously owned by E.on from 2010. but now transferred to Pelamis Wave Power in 2013.
- AW-Energy from Finland undertook stand-alone mechanical testing in 2005 in the shallower waters at the test site.
- Aquamarine Power Ltd installed its Oyster wave power device on the seabed in August 2009 and generated electricity for the first time in November of the same year. Aquamarine installed its Oyster 2 800 kW wave energy converter in the summer of 2011.
- Ocean Power Technologies (OPT) was scheduled to deploy its PowerBuoy in 2009 but instead decided to conduct sea trials in the Moray Firth in 2010.
- Wello, a Finish-based company, is currently testing its Penguin wave energy converter at the EMEC site throughout 2012/2013.
- Seatricity, an Antigua-based company, has taken the other near shore berth. It will adopt a similar method to Aquamarine Power of using its device to pump water ashore to a standard hydro-electric power take-off system. it has already been involved in testing a number of its buoy units at the test site and is expected to deploy a full scale array in 2014.
Tidal power testing at EMEC
The tidal power test site at the Fall of Warness, to the west of the island of Eday, was chosen for its high velocity marine currents which reach almost 4 m/s (7.8 knots) at spring tides. The facility offers five test berths at depths ranging from 25 m to 50 m in an area 2 km across and approximately 4 km in length.
From each developer berth, the subsea cables follow back along the seabed and then pass under the beach and into an external housing next to the substation. An adjacent laydown area then provides an optional area for developers to use conditioning equipment for converting from the level at which they are generate to grid compliant electricity. Underground ducts then connect the cables through to the switchboard in the substation building. The substation building has four separate areas: the HV switchroom, communications room, personnel room and the standby generator room.
The test site was officially opened by Scotland's First Minister in September 2007.
The following tidal developers have installed technologies at EMEC's Fall of Warness tidal test site:
- OpenHydro: The first developer to use the site is Dublin based OpenHydro, who began the installation of their open centred turbine in 2006. OpenHydro became the first tidal technology to be grid connected in Scotland and subsequently the first tidal stream generator to successfully generate electricity to the national grid in the UK. OpenHydro have also placed a blank turbine on the seabed adjoining their installed device, using the specially commissioned “OpenHydro Installer”, and as at January 2016 are currently testing their 7th generation tidal technology at EMEC.
- Atlantis Resources Corporation have installed two tidal turbines: the AK-1000 tidal turbine which was subsequently replaced by the AR-1000.
- Alstom (formerly Tidal Generation Ltd): TGL deployed at their 500 kW DeepGen tidal turbine at EMEC in 2009, and began generating to the grid the following year. They have subsequently replaced the 500 kW device with a 1MW version of the technology at EMEC.
- ANDRITZ HYDRO Hammerfest: ANDRITZ HYDRO Hammerfest installed their HS1000 tidal energy converter in 2011. The technology is now being developed for installation at MeyGen.
- Scotrenewables Tidal Power Ltd deployed their SR250 floating tidal turbine for the first time in 2011, and are currently developing a 2MW version of their technology, due to be tested at EMEC in 2016.
- Voith deployed their Hy-Tide 1MW turbine at the Fall of Warness in 2013.
The wildlife observations at the test site which have been underway since June 2005 are continuing to provide essential baseline environmental data.
Non-grid connected test sites
EMEC has also worked hard to ease the path to market for marine renewable developers by developing test sites in less challenging conditions, helping to close the gap between testing in a wave or tidal tank and bringing full-scale prototypes to trial in real sea conditions.
These non-grid connected test sites - situated at Shapinsay Sound and Scapa Flow - provide a more flexible sea space for use by smaller scale technologies, supply chain companies, and equipment manufacturers. Such accessible real sea testing enables marine energy developers and suppliers to learn lessons more cheaply by reducing the need for big vessels or large plant.
At these sites multi-point anchoring systems provide developers with a fully functional alternative to either bringing their own gravity base or having to drill and install anchor chains and mooring blocks. Bespoke test support buoys allow developers to dissipate the electricity generated by their devices in an environmentally conscious way, while transferring wave and tidal data back to the control centre. An area of seabed is also available for rehearsal of deployment techniques.
Technologies that have tested at EMEC's non-grid connected sites include:
EMEC is accredited to test laboratory standards (ISO 17025) and can test the performance of wave and tidal energy devices against IEC Technical Specifications.
EMEC can provide independent verification in accordance with ISO 17020 to confirm that a wave energy converter satisfies its conceptual reliability, survivability and performance targets. With proof of performance credibly assured, you can reduce the technological risk for technology purchasers, helping to attract investment and increase your market share.
Environmental Technology Verification
In 2014, EMEC expanded its scope attaining the International Standard ISO/IEC 17020 for verification of the performance of new environmental technologies. Open to energy technologies, water treatment and monitoring technologies, and materials, waste and resources, EMEC-ETV (Environmental Technology Verification) can help innovative technologies reach the market via the provision of a Statement of Verification.
Marine industry standards
EMEC has coordinated the development of a suite of standards on behalf of the marine renewable energy industry. Each document has been progressed by a working group with individuals representing technology developers, regulators, academia, utilities, and project developers – a true cross-section of the marine energy industry. These standards were launched in 2009 and are available free for download from the EMEC website: EMEC Standards.
In March 2014, EMEC, in collaboration with the Offshore Renewable Energy Catapult (ORE Catapult), facilitated a workshop to review the existing suite of EMEC standards and identify areas where new standards require to be developed. The report from the workshop is available to download here: Review of Standards for Marine Renewables (Wave & Tidal)
Research and monitoring
For most developers coming to deploy at EMEC, installation at these facilities will be the first time their device has been in the open sea and grid connected. They typically will not have a track record which indicates the type and extent of interactions between the device and the receiving environment. Therefore, whilst the central purpose of EMEC is to provide an operational test facility, there is also a key role in establishing and facilitating monitoring of devices in relation to their impacts on the receiving environment. The main driver to this has been through the consenting process, which requires developers to consider environmental issues prior to testing at EMEC and to mitigate against any potential for negative impact.
The involvement within the research field has led EMEC to occupy a unique position, having links with a range of different developers and devices, as well as academic institutions and regulatory bodies. EMEC is independent of any developer or device, as EMEC aims to ensure that different devices are monitored in a consistent way, using the best available methods. Independence of EMEC also encourages the dissemination of monitoring information can be carried out throughout the industry.
Power Purchase Agreement
SmartestEnergy has signed a Power Purchase Agreement with the EMEC, for the power generated from their wave and tidal devices in the Orkney Islands.
- "European Marine Energy Centre". Retrieved 2007-02-03.
- "E.ON announce world first for its P2 wave energy device". Retrieved 2010-12-03.
- Independent on Sunday (London) May 29, 2005, Sunday, Tim Webb, "Sandals and beards are banished in a quest to find 20,000 volts under the sea. Tim Webb travels to the Orkneys to discover a source of clean power." First Edition; BUSINESS; Pg. 15
- "Oyster wave power in operation". Archived from the original on November 29, 2010. Retrieved 2010-12-03.
- "Aquamarine Power - How Oyster wave power works". Retrieved 27 June 2011.
- "OPT - PowerBuoy test in Scotland". Archived from the original on September 28, 2013. Retrieved 6 October 2013.
- "Penguin's safe arrival after 10 day voyage". Retrieved 2011-06-27.
- "OpenHydro becomes the first Tidal Energy company to generate electricity onto the UK National Grid" (PDF). 2008-05-27. Archived from the original (PDF) on September 15, 2008. Retrieved 2008-08-16.