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== Key companies and turbines ==
Many companies have focused on the development of technology to harness tidal stream energy. A non-exhaustive list of key companies is given below. <!-- Add details of companies below. Can move to a dedicated page if sufficiently detailed, and summarise with {see also|} here. -->
=== Alstom ===
French manufacturer [[Alstom]] acquired [[Development of tidal stream generators#Tidal Generation Ltd|Tidal Generation Ltd]] in 2013, but this part of the business was sold to [[General Electric]] in 2015.<ref name=":38" /><ref name=":39" />
=== Andritz Hydro Hammerfest ===
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A phase 2 Flumill tidal device is currently being developed, where the screws and generators are mounted from a catamaran barge.<ref>{{Cite web |title=Aquatera Ltd on LinkedIn: This month, Aquatera had yet another successful All-Energy Exhibition and… |url=https://www.linkedin.com/posts/aquatera-limited_this-month-aquatera-had-yet-another-successful-activity-7066746984061116417-rsnE |access-date=2024-01-20 |website=www.linkedin.com |language=en}}</ref>
=== General Electric ===
In 2015, [[General Electric|GE]] acquired the energy assets from [[Alstom]] which included the business originally developed by [[Development of tidal stream generators#Tidal Generation Ltd|Tidal Generation Ltd]].<ref name=":39" />
=== HydroQuest ===
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=== 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 name=":38">{{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 name=":39">{{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
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]].<ref name=":110" /> The turbine rotor was 18 m in diameter, mounted on a 22 m long nacelle, with a mass of under 150 t.<ref>{{Cite web |last= |first= |date=2024-05-03 |title=Alstom produced electricity with its 1MW tidal turbine as a… |url=https://www.eti.co.uk/news/alstom-produced-electricity-with-its-1mw-tidal-turbine-as-a-part-of-eti-redapt-project |access-date=2024-05-04 |website=The ETI |language=en}}</ref> It had cut-in, rated, and maximum flow speeds of 1 m/s, 2.7 m/s, and 5 m/s respectively.
In 2014, a 1.4 MW turbine was proposed, again with an 18 m diameter rotor. It was marketed as the Oceade™ 18 – 1.4 MW, but was never built.<ref>{{Cite web |last=Visser |first=Anne |date=2014-10-01 |title=Alstom Presents 1.4MW Tidal Turbine |url=https://www.offshorewind.biz/2014/10/01/alstom-presents-1-4mw-tidal-turbine/ |access-date=2024-05-04 |website=Offshore Wind |language=en-US}}</ref>
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>
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