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The triangular base frame was designed to support three turbines, although only a single turbine was tested.<ref name=":36" /> Eco2 in conjunction with TEL had planned to install an array of nine devices [[St David's Head]], to the north of Ramsey Sound.<ref name=":23" />
[[File:TGL DeepGen III at Hatston Pier.jpg|alt=The faded yellow nacelle of a tidal turbine, with three stubby blue blades at the left. Below and in front is a car, portacabin and fencing typical of industrial settings |thumb|The 500 kW TGL DeepGen III tidal stream turbine at Hatston Pier, Orkney]]
[[File:TGL DeepGen IV at Hatston Pier.jpg|alt=A faded yellow nacelle of a tidal turbine, with three stubby blades at the left, the top one with traces of red paint. Two people stand below the blades, a third person is in a cherrypicker lift to the right. A metal frame with steps lead up to the rear of the nacelle on the right of the image.|thumb|The 1 MW TGL DeepGen IV tidal stream turbine at Hatston Pier, Orkney]]
=== Tidal Generation Ltd ===
'''Tidal Generation Ltd''' (TGL) was a [[Bristol]]-based developer of tidal stream turbines, founded in 2005.<ref name=":04">{{Cite web |title=Alstom (formerly TGL) |url=https://www.emec.org.uk/about-us/our-tidal-clients/alstom/ |access-date=2024-02-03 |website=European Marine Energy Centre |language=en}}</ref> It was acquired by [[Rolls-Royce Holdings|Rolls-Royce]], before being sold to [[Alstom]] in 2013.<ref name=":04" /><ref>{{Cite web |title=Alstom to acquire Tidal Generation Ltd - NS Energy |url=https://www.nsenergybusiness.com/news/newsalstom-to-acquire-tidal-generation-ltd/ |access-date=2024-02-03 |language=en-US}}</ref> Then in 2015, [[General Electric]] acquired Alstom's energy division, including TGL.<ref>{{Cite web |date=2015-11-03 |title=Alstom has finally sold its energy business to GE for $13.6b |url=https://www.independent.co.uk/news/business/news/alstom-sells-energy-business-to-ge-for-13-6b-a6718056.html |access-date=2024-02-10 |website=The Independent |language=en}}</ref> In 2021 French tidal developer Sabella then acquired General Electric's tidal energy assets, including those developed by TGL, Rolls-Royce and Alstom.<ref>{{Cite news |date=1 February 2021 |title=Sabella acquires GE's tidal assets |url=https://renews.biz/66158/sabella-acquires-ges-tidal-assets/ |access-date=2024-02-10 |work=ReNEWS.biz}}</ref>
TGL tested a 500 kW turbine at [[European Marine Energy Centre|EMEC]] from September 2010 as part of the Deep-Gen III project.<ref name=":04" /> This was the first turbine installed at EMEC that was eligible for [[Renewables Obligation (United Kingdom)|Renewables Obligation Certificates]].<ref name=":110">{{Cite web |last=Shead |first=Sam |date=2011-10-27 |title=Prototype tidal turbine delivers 100MWh to Scottish grid |url=https://www.theengineer.co.uk/content/news/prototype-tidal-turbine-delivers-100mwh-to-scottish-grid/ |access-date=2024-02-03 |website=The Engineer |language=en}}</ref> By September 2012, it had generated over 250 MWh of electricity which was supplied to the local grid.
An upgraded 1 MW Deep-Gen IV turbine was developed while part of Rolls-Royce within the ''Reliable Data Acquisition Platform for Tidal'' (ReDAPT) project, partly funded by the [[Energy Technologies Institute|Energy Technologies Institute.]]<ref name=":110" />
The TGL turbines were a three-bladed horizontal-axis design which could yaw to face the incoming tide, driven by a thruster on the rear of the nacelle. They nacelle of the turbine was buoyant, which allowed it to towed to site then installed onto the subsea tripod foundation using a winch system operated from small workboats.<ref>{{Cite report |url=https://ukerc.rl.ac.uk/ETI/PUBLICATIONS/MRN_MA1001_3.pdf |title=ReDAPT MC7.3 Public Domain Report: Final |last=Harrison |first=J |date=2015-08-12 |doi=10.5286/UKERC.EDC.000316 |access-date=2024-02-10}}</ref>
=== Tocardo ===
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