Key Details

  • Status Operational
  • Availability Commercial Research
  • General Grid connected
  • Targeted TRL 7 - 9

Listing Description

EMEC’s grid-connected tidal test site at the Fall of Warness is situated just west of the island of Eday – lying in a narrow channel between the Westray Firth and Stronsay Firth.  The site was chosen for its high velocity marine currents which reach almost 4m/sec (7.8 knots) at spring tides. As tides flow from the North Atlantic Ocean to the North Sea, they quicken as they are funneled through Orkney’s northern islands.

Current meters characterise the tidal and wave conditions on site, and a purpose-built weather station is situated onshore providing real-time met data for the site. This data is fed into a sophisticated SCADA (supervisory, control and data acquisition) system, with live data feeds on the met conditions available to view on our website.

EMEC offers seven cabled tidal test berths at depths ranging from 12 m to 50 m in an area 2 km across and approximately 4 km in length.

The 11 kV subsea cables feed into EMEC’s substation at Caldale in Eday which houses the main switchgear, backup generator and communications room. The substation controls the supply from each tidal device and connection to the national grid. An adjacent laydown area offers developers the opportunity to use conditioning equipment for converting electricity from the level at which it is generated to grid compliant electricity. Another building on site holds the Scottish and Southern Energy transformer where the 11 kV is transformed to 33 kV. Eday is linked to both Westray and Sanday by subsea cables that form a ring through the Northern Isles and feed into the national grid.

In addition to transporting electricity, the cables contain fibre-optics which allow developers to communicate with the devices and transmit monitoring data back to our data centre and office facilities.

The test site has 4 MW export capacity, which will increase in 2023 to 7.2 MW total export capacity, to support the testing of multiple longer-term demonstrations on site.