Atlantis installed one 1000kW tidal engery conversion device (AK-1000), at the fall of Warness tidal energy test site at EMEC in 2011. The device was due to be operationale in August 2010; however, due to technical problems the site was delayed until August 2011. The device operates with two sets of blades, which are fitted on a single unit, the AK-1000 tidal turbine to tackles reflux and flood tides. The diameter of each blade is 18m, and they rotate slowly at a rate of six to eight revolutions a minute, resulting in low environmental impact.
The device was installed at European Marine Energy Centre (EMEC) tidal device test area in Fall of Warness, Orkney.
South Seal Skerry (West Coast of Eday) Orkney. Water Depth: 33m LAT. Lat (WGS84): 59°8’59.899" N. Long (WGS84): 2°49’37.301" W. Tidal range: 3m. Tidal speeds up to 3.7 m/s.
The AK-1000 tidal turbine was planned to be installed in August 2010 at EMEC’s test sites, Orkney. However, due to construction issues, the installation was delayed until August 2011. After a 12 month period, the Mark 1 device will be replaced by a Mark 2 turbine. The Mark 2 turbine will have identical dimensions as the Mark 1 turbine, and will be able to maintain a maximum power output of 1MW. The GBS (Gravity based structure) will not need replacing.
As part of the decommissioning plan in 2004, Atlantis operations Ltd applied for two consultation rounds. The first was sent to 16 DECC (formerly DTI/BERR) specific stakeholders including; The Chamber of Shipping, Historic Scotland, Orkney Fisheries Association and the Orkney Island Council. The second report produced to apply towards specific government departments, including; CEFAS, Marine Scotland, The Crown Estate and The UK Hydrographic Office. The stakeholders had a statutory 30days to provide consultation Reponses.
Baseline studies for the Fall of Warness test site were performed by EMEC and can be found here.
The sites seabed ranges from eroding sub-littoral sandbanks in the east to smooth scoured bedrock ridges and platforms with occasional boulders towards the center of the site. Fall of Warness is not a protected area; however, there are protected sites in close proximity. These include:
- Faray and Holm of Faray SAC – protected for its grey seal populations.
- Sanday SAC – Protected for its harbor seal populations, intertidal mudflats and sandflats, inshore sublittoal rock and subtidal sandbanks.
- Muckle and Little Green Holm SSSI – Nationally important grey seal breeding colony (Around 3% of the national breeding population).
Environmental monitoring information at the Fall of Warness tidal test site can be found at: https://tethys.pnnl.gov/annex-iv-sites/emec-fall-warness-grid-connected-...