On the verge of commercially viable tidal energy – Scotland on Sunday

by TERRY MURDEN

A UNIVERSITY spin-out company is poised to become the first tidal energy
technology developer to produce commercially viable electricity.

Tests are now being carried out at the European Marine Energy Centre in
Orkney on a turbine device and mooring system developed by renewable energy
engineers in ­Glasgow.

Nautricity, a company which emerged from Strathclyde University, has spent
18 months building its first commercial-scale device known as a Contra
Rotating Marine Turbine (Cormat).

With the help of a £250,000 Smart Scotland grant from Scottish Enterprise,
it has also developed and patented a tethered-based mooring system, called
a Hydrobuoy, that ensures the Cormat devices remain steady in strong currents.

Cameron Johnstone, the company’s co-founder and chief executive, said
testing the device at full scale in real-life conditions was an important
step forward that would produce valuable data to allow the company to move
to full commercial deployment.

“Once we have demonstrated the technology here and shown that it can
provide affordable electricity, we will then build out at home and
overseas,” he said. “In order to be able to ­compete abroad in the future,
it’s essential that we have a ­robust, indigenous ­market from which to
launch our ­international business ­development.”

Johnstone said the firm was “doing all of the right things in developing
lower-cost, next-generation technology” through a comprehensive testing
programme and was gathering the data to ensure the devices taken to market
work effectively and can compete with other forms of energy generation.

He said conventional tidal devices resemble wind turbines constructed on
the seabed, but they incur “enormous deployment and engineering costs”.

Cormat, he said, is a lighter and more compact device, tethered to the
seabed and held in tension by a sub-surface float.

The turbines can be used in depths of up to 500 metres and, because they
are closely spaced and contra-rotating rotors move in opposite directions,
they remain steady in the face of strong tidal flows.