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'''Tidal Energy Ltd''' (TEL) was a tidal stream developer based in Cardiff, Wales. They developed a three-bladed horizontal-axis turbine mounted on a 16 m long triangular gravity base. To increase reliability, a simple fixed-pitch blade design was used.<ref>{{Cite conference |last=Freeman |first=C |last2=Amaral Teixeira |first2=J |last3=Trarieux |first3=F |last4=Ayre |first4=R |date=2009 |title=Design of a gravity stabilised fixed pitch tidal turbine of 400 kW |url=https://tethys-engineering.pnnl.gov/sites/default/files/publications/Freemanetal2009.pdf |conference=Proceedings of the 8th European Wave and Tidal Energy Conference, Uppsala, Sweden. |via=Tethys}}</ref>
A 400 kW prototype was installed in [[Ramsey Island#Ramsey Sound|Ramsey Sound]], Wales in December 2015 after sitting on the quayside at [[Pembroke Dock]] for over a year.<ref name=":23">{{Cite web |last=Kelsey |first=Chris |date=2015-12-14 |title=Tidal energy device DeltaStream installed in the sea |url=http://www.walesonline.co.uk/business/business-news/radical-new-tidal-energy-device-10594709 |access-date=2024-02-03 |website=Wales Online |language=en}}</ref><ref name=":36">{{Cite news |date=2015-12-13 |title=Giant tidal turbine placed on seabed off Pembrokeshire |url=https://www.bbc.com/news/uk-wales-south-west-wales-35087510 |access-date=2024-02-03 |work=BBC News |language=en-GB}}</ref> In March 2016, the turbine developed "an intermittent fault with an active sonar" followed by a mechanical defect which prevented it generating.<ref name=":37">{{Cite web |last=Poindexter |first=Gregory |date=2016-12-13 |title=Welsh government says buyer being sought for 400-kW DeltaStream tidal energy device |url=https://www.hydroreview.com/business-finance/business/welsh-government-says-buyer-being-sought-for-400-kw-deltastream-tidal-energy-device/ |access-date=2024-02-03 |website=Hydro Review |language=en-US}}</ref> After the company went into administration in October,<ref>{{Cite news |date=2016-10-24 |title=Administrators seek buyer for Tidal Energy Ltd |url=https://www.bbc.com/news/uk-wales-south-west-wales-37752750 |access-date=2024-02-03 |work=BBC News |language=en-GB}}</ref> the Welsh Government sought a buyer for the turbine in December 2016.<ref name=":37" />
There were plans to remove the turbine as part of the Anglo-French ''Tidal Stream Industry Energiser Project'' (TIGER) project, and examine the reasons for the failures. The Ramsey Sound site was also to be redeveloped by Cambrian Offshore South West, with a new turbine of up to 1 MW installed.<ref>{{Cite web |last=Fowler |first=David |date=2020-03-23 |title=In depth with the TIGER tidal stream project |url=https://www.theengineer.co.uk/content/in-depth/in-depth-with-the-tiger-tidal-stream-project/ |access-date=2024-02-03 |website=The Engineer |language=en}}</ref>
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" />
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