Morlais is a grid connected tidal stream energy project located in the Irish Sea just off the west coast of Holy Island, Anglesey, Wales.

The 35 km2 (14 sq mi) site was designated for tidal energy by The Crown Estate in 2010, as the West Anglesey Demonstration Zone, and has been leased for 45 years.

Mark Drakeford officially opened the onshore substation in October 2023,[6] noting that "Morlais is a groundbreaking project and a key part of our transition to a low carbon economy".

[9] An environmental impact assessment was completed, with detailed independent studies on various aspects of the project construction, operation, and decommissioning.

[10] Environmental surveys are still ongoing, with a monitoring buoy equipped with cameras and other sensors deployed in July 2023,[11] as part of the Marine Characterisation Research Project.

[12] The project, as set out in the Environmental Statement[13] will comprise the following elements: The onshore grid connection work was completed by civil engineering firm Jones Bros in June 2023, three months ahead of schedule.

Several developers have announced plans to deploy devices and have been awarded Contracts for Difference (CfD) in Allocation Rounds AR4, AR5 and AR6 to supply power to the GB grid at a guaranteed price, at a specified future delivery year.

[17][18] Hydrowing, part of Inyanga Marine Energy Group,[19] plan to deploy an initial phase of around 10 MW, using the next-generation Tocardo T3 turbines, mounted on a multi-rotor frame that has a wing-like structure.

[22] The Verdant Power device is a three-bladed horizontal axis tidal turbine that sits on a triangular frame on the seabed, previously tested in New York’s East River.