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Many [[Tidal stream generator|tidal stream generators]] have been developed over the years to harness the power of tidal currents flowing around coastlines. These are also called tidal stream turbines (TST), tidal energy converters (TEC), or marine hydro-kinetic (MHK) generation. These turbines operate on a similar principle to [[Wind turbine|wind turbines]], but are designed to work in a fluid approximately 800 times more dense than air which is moving at a slower velocity. Note that [[
Lots of different technology variants have been tested, and there has not been convergence on a predominant typology. Most have been horizontal-axis, like wind turbines, but with 2, 3, or more blades and either mounted on a seabed fixed foundation or on a floating platform. In addition, vertical-axis turbines and tidal kites are also being developed.
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Three Andritz Hydro Hammerfest '''AH1000 MK1''' turbines were installed as part of phase 1 of the [[MeyGen]] project in 2016. These turbines are still three-bladed, but with an 18 m diameter rotor and each rated at 1.5 MW.<ref>{{Cite web |title=MeyGen |url=http://saerenewables.com/tidal-stream/meygen/ |access-date=2023-12-21 |website=SAE Renewables |language=en-GB}}</ref>
=== LHD New Energy Corporation ===
'''LHD New Energy Corporation''' have developed the Zhoushan tidal power station near Xiushan island, [[Daishan County]], China.<ref>{{Cite web |last=Garanovic |first=Amir |date=2023-05-26 |title=Tidal energy plant in China exceeds 5 years of continuous operation |url=https://www.offshore-energy.biz/tidal-energy-plant-in-china-exceeds-5-years-of-continuous-operation/ |access-date=2023-12-31 |website=Offshore Energy |language=en-US}}</ref> This platform above the sea is connected to land by a bridge. In 2016, the first two turbines were installed and connected to the grid, rated at 400 kW and 600 kW.<ref name=":28">{{Cite report |url=https://www.ocean-energy-systems.org/publications/oes-annual-reports/ |title=Annual Report Ocean Energy Systems 2016 |last=IEA-OES |date=2017 |page=73}}</ref> In December 2018, two further turbines were added, a 300 kW horizontal-axis and a 400 kW vertical-axis, taking the total installed capacity to 1.7 MW.<ref name=":29">{{Cite report |url=https://www.ocean-energy-systems.org/publications/oes-annual-reports/ |title=Annual Report - An overview of ocean energy activities in 2018 |last=IEA-OES |date=2019 |page=68}}</ref>
=== Magallanes Renovables ===
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{{See also|Marine Current Turbines|SeaGen}}
'''Marine Current Turbines''' (MCT) was a [[Bristol]]-based company that developed seabed mounted tidal-stream turbines. In June 2003, MCT installed the 300 kW Seaflow turbine in [[Lynmouth]], Devon.<ref name=":11">{{Cite report |url=https://www.osti.gov/etdeweb/servlets/purl/20714897 |title=Development installation and testing of a large-scale tidal current turbine |last=Thake |first=Jeremy |date=October 2005 |access-date=2023-12-21}}</ref> The larger 1.2 MW SeaGen turbine was installed in [[Strangford Lough]] in May 2008, and connected tot the Irish electricity grid in July. It was decommissioned in stages between May 2016 and July 2019, having exported 11.6 GWh of electricity.<ref name=":13">{{Cite web |date=2019-09-03 |title=Atlantis Successfully Decommissions 1.2 MW SeaGen Tidal System in Industry First {{!}} SIMEC Atlantis Energy |url=https://web.archive.org/web/20190903161227/https://simecatlantis.com/2019/07/26/meygen-operational-update-3-2/ |access-date=2023-12-22 |website=web.archive.org}}</ref>
=== Nova Innovation ===
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{{Main|Verdant Power}}
'''Verdant Power, Inc''' is a developer of tidal stream turbines, based in New York, USA. They have tested turbines in the [[East River]] since 2006. An array of six 35 kW turbines supplied power to two local businesses from May 2007 to October 2008.<ref name="nytimes20120912">{{Cite news |last=McGeehan |first=Patrick |date=2012-09-11 |title=In Quest for River's Power, an Underwater Test Spin |language=en-US |work=The New York Times |url=https://www.nytimes.com/2012/09/12/nyregion/in-quest-for-east-rivers-power-a-search-for-stouter-arms.html |url-status=live |url-access=subscription |access-date=2020-10-28 |archive-url=https://web.archive.org/web/20120912120623/https://www.nytimes.com/2012/09/12/nyregion/in-quest-for-east-rivers-power-a-search-for-stouter-arms.html |archive-date=2012-09-12 |issn=0362-4331}}</ref> An upgraded platform with three turbines was installed in October 2020.<ref name=":27">{{Cite web |date=2020-10-28 |title=3 Tidal Turbines Pop Into New York City's East River |url=https://cleantechnica.com/2020/10/28/3-tidal-turbines%E2%80%A9-pop-into-new-york-citys-east-river/ |access-date=2020-10-28 |website=[[CleanTechnica]] |language=en-US}}</ref>
=== Zhejiang University ===
'''Zhejiang University''' has installed three tidal stream turbines to the north of Zhairuoshan Island ({{coord|29|57|27.03|N|122|4|57.31|E|}}), in the [[Zhoushan]] archipelago.<ref>{{Cite web |last= |date=2015-04-30 |title=Visit to Floating Tidal Turbine in Zhoushan, China |url=https://www.itpenergised.com/visit-to-floating-tidal-turbine-in-zhoushan-china/ |access-date=2023-12-31 |website=ITPEnergised |language=en-GB}}</ref> A 60 kW turbine was installed in 2014, a 120 kW turbine deployed in 2015, and a 600 kW turbine in 2018.<ref name=":29" />
== List of grid-connected tidal stream generators ==
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|2017
|<ref name=":26" /><ref name=":20" /><ref name=":24" />
|-
| rowspan="2" |Zhoushan tidal power station
|0.4
| rowspan="2" |{{Flag|China}}
| rowspan="2" |[[Zhoushan]], Zhejiang
| rowspan="2" |{{coord|30|8|15.48|N|122|10|1.25|E|}}
| rowspan="2" |2016
| rowspan="2" |Operational
| rowspan="2" |<ref name=":28" />
|-
|0.6
|-
|Nova Innovation, M100
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|2018-09
|<ref name=":25" />
|-
| rowspan="2" |Zhoushan tidal power station
|0.3
| rowspan="2" |{{Flag|China}}
| rowspan="2" |[[Zhoushan]], Zhejiang
| rowspan="2" |{{coord|30|8|15.48|N|122|10|1.25|E|}}
| rowspan="2" |2018-12
| rowspan="2" |Operational
| rowspan="2" |<ref name=":29" />
|-
|0.4
|-
|Magallanes Renovables, ATIR
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