OES-Environmental distributes metadata forms (questionnaires) to solicit information from developers involved in environmental monitoring around marine renewable energy project sites around the world. This page provides project descriptions, baseline assessment, post-installation monitoring, and links to available data and reports. Content is updated on an annual basis.

Nautricity at EMEC

Project Site OES-Environmental

Title: Nautricity at EMEC
Start Date:
April 01, 2017
Research End Date:
February 01, 2019
Technology Type:
Info Updated:
January 05, 2019
Project Status: 
Device in operation
CoRMaT 500 horizontal axis turbine
Project Scale: 
Single device
Installed Capacity: 
0.5 MW

Nautricity is testing its second generation tidal turbine CoRMaT, a full-scale 500 kW prototype device suitable for deployment in water depths of 8 – 500 m. This follows deployment and testing of a full-scale mooring system at the European Marine Energy Centre (EMEC) which included Nautricity's 'Hydrobuoy' – a hydro-dynamic subsurface float whose lift varies with tidal flow velocity, and deployment of the full-scale turbine onto the mooring assembly at EMEC and observation of its performance in wave and tidal environments, both in 2013.


The CorMaT turbine employs two closely-spaced contra-rotating rotors, which drive the rotor and rotating stator sections of an electrical generator. The first rotor has three blades rotating in a clockwise direction while the second rotor, located directly behind the first, has four blades rotating in an anti-clockwise direction. Buoyancy chambers at the front and rear sections of the nacelle are tuned to achieve neutral buoyancy. The turbine is connected to a tensioned mooring at a point in the water column where the flow velocity is greatest and surface wave action minimized.


The device is installed in berth 3 at EMEC’s tidal device test facility at Fall of Warness, Orkney, UK.  Water Depth: 33m. Tidal range: 3m. Tidal speeds up to 3.7 m/s.

Deployment area:

59° 8.114’N, 2°48.962’ W

59° 8.114’N, 2°48.857 W

59° 7.928’N, 2°48.858’ W

59° 8.928’N, 2°48.962’ W

Project Timeline: 

Installation of mooring infrastructure began at the beginning of March 2017, and the CoRMaT device was deployed in April 2017. In March 2018 the device was retrieved for investigation and analysis of the turbine, its supporting systems and data to assess the impact of extended exposure.

Licensing Information: 

The CoRMaT project has an installed capacity of less than 1 MW, therefore no Section 36 Consent was required.  A Marine License was granted under the Marine (Scotland) Act 2010 by Marine Scotland (the licensing authority) on 22nd February 2017 (Licence no. 06260/17/0), which can be viewed here.

Key Environmental Issues: 

The site’s seabed ranges from eroding sub-littoral sandbanks in the east to smooth scoured bedrock ridges and platforms with occasional boulders towards the center of the site. Fall of Warness is not a protected area; however, there are protected sites in close proximity. These include:

  • Faray and Holm of Faray SAC – protected for its grey seal populations.
  • Sanday SAC – Protected for its harbor seal populations, intertidal mudflats and sandflats, inshore sublittoal rock and subtidal sandbanks.
  • Muckle and Little Green Holm SSSI – Nationally important grey seal breeding colony (Around 3% of the national breeding population).


EMEC has produced a specific Environmental Appraisal (EA) for the Fall of Warness site which can be downloaded from here.

Nautricity at EMEC is located in United Kingdom.

Baseline Assessment: Nautricity at EMEC

General Description:

A review of the EMEC Fall of Warness Test Site Environmental Appraisal identified a number of potential residual impacts that are considered relevant to the CoRMaT 500 deployment.

ReceptorStudy Description Design and Methods Results Status
  • Physical Environment

Potential for changes to hydrodynamics and physical processes

Desk based study

No important impacts of relevance to hydrodynamics or physical processes are expected from developments at Fall of Warness.

  • Benthos

Introduction of marine non-native species (via vessels, devices or other equipment)

Desk based study

Vessels from within Scotland will be used therefore there is no potential for introduction of NNS via vessels.

  • Fish and Fisheries

Introduction of marine non-native species (via vessels, devices or other equipment)


Benthic fish and shellfish

Desk based study

Vessels from within Scotland will be used therefore there is no potential for introduction of NNS via vessels.

  • Fish

Electromagnetic field (EMF) effects

Desk based study

No significant effects

  • Large Vertebrates

Potential impacts on marine mammals and basking sharks as a result of support vessel activity, e.g. noise and physical presence

Desk based study

Installation of the CoRMaT 500 will be completed using standard multi-cat type vessels assisted by a RIB.  Installation activities will be completed in a relatively short timescale.

No significant effects on any sensitive species are expected from this low level of vessel activity. 


Post-Installation Monitoring: Nautricity at EMEC

General Description:

The ffollowing mitigation and monitoring measures were proposed within the Project Environmental Monitoring Plan (PEMP), available from the following: https://www2.gov.scot/Resource/0051/00518157.pdf

ReceptorMonitoring Program Description Design and Methods Results Status
  • Large Vertebrates

Monitoring physical interactions of cetaceans, basking sharks, and harbour and grey seals with device

Device fitted with a video camera for collision and near-miss detection.

Position and speed of turbine and rotors respectively monitored via speed sensor, accelerometers and inclinometers.

Noise signature of device defined by a hydrophone survey.


Reports and Papers N/A
Research N/A
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