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Moving Offshore—The Future of Tidal Energy
May 13, 2016
Frédéric Navarro
6 comments

As the planet increasingly looks to curb greenhouse emissions, it is not uncommon to see solar and wind energy take center stage in the debate. However, a sometimes-neglected form of energy could play a major role in preparing economies for a future that is less dependent on fossil fuels—tidal energy.

The potential energy that could be harvested from tidal movements on a global scale is enormous. It is estimated that around 1 terawatt of exploitable power is stored in the world’s oceans. This would be enough to power 10 billion 100-watt lightbulbs at once.

16 kilometers (km) offshore and 35 meters under water, advanced technology providing clean power

The world’s first subsea offshore tidal array, known as the Paimpol-Bréhat Tidal Array developed by EDF, will soon be ready for operation. The second turbine will soon be deployed onto the seabed and join the first turbine already in place together with GE Power Conversion’s subsea converter. Once completed, the Paimpol-Bréhat Tidal Array is expected to reach a total capacity of 1 megawatt (MW) of power.

The array uses a subsea converter system, supplied by GE Power Conversion, to control the turbine and convert the electricity from AC to high-voltage DC, minimizing the energy loss when the power is transmitted 16 km back to shore. It is then converted back to AC by GE’s drive at the onshore facility before being delivered to the grid.

While prices for fossil fuels such as oil are currently low, the volatility and insecurity of the price remains a risk factor for plant operators and end users alike, making management and long-term planning difficult. Moreover, in a bid to reduce greenhouse emissions, there is a pressing need to move away from reliance on fossil fuels towards a wider energy mix.

Although 1 MW at Paimpol-Bréhat presents a moderate amount of power, the project sets an incredible precedent for future tidal plants, leading the way towards further offshore arrays, and taking us one step closer to a future of cleaner, greener power generation.

Plugging into tidal

Many European countries are already embracing tidal, with France and the U.K. as leading examples. France first embraced tidal in 1966 when it opened the Rance Tidal Power Station. Today, Rance continues to generate 600 gigawatt hours a year, powering 130,000 homes. As the station enters its fifth decade of production, we understand how to harness tidal energy better and are also able to employ new technologies to make it more efficient while lowering the cost.

Across the channel in the U.K., there are a number of tidal development projects being considered. One of the most notable projects, the proposed Swansea Bay Tidal Lagoon, would be set in the Severn Estuary. The selected location holds the second highest tidal range in the world. Once production starts, it is anticipated that it would reliably generate enough power for approximately 155,000 homes every year for 120 years.

Tidal lagoon projects are built using mature hydro technology. Much like a hydroelectric dam, a tidal lagoon functions by allowing water to enter and leave the lagoon, which in turn drives a turbine within the housing.

Plans are already being made to build another tidal lagoon in Cardiff, which would anticipate providing power for over 1 million homes. Tidal plants can also meet the challenges faced by renewables by providing the industry with a baseload. Since tides are predictable and do not occur at the same time along same stretch of coastline, plants can be regulated and designed to work at full capacities on alternating pre-determined schedules, thus providing constant available power to the grid.

Thanks to new technology, a number of tidal energy options have now surfaced; ready to transform the way we generate energy for our growing demands.

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Robles
Hi, AC-DC-AC converters are VSC technology? Cable XLPE t ype? Thank you very much Robles.
Paul DiMaggio
GMax Tidal Energy can provide 2 Mega-Watts of base, and / or peak power using linear flow technology. We believe, there will be several viable, cost effective, commercialized tidal energy methods in place soon. The various innovations will be based on the geographic topography, and Ocean current speeds. Location acquisition, near or off shore, eliminates line of sight and navigation challenges with a float stage design, and mostly non-existent with other foundation based or turbine submerged methods. More so, we can now predict carbon-free energy production 50 years in advance regardless of any method, all thanks to Mother Nature’s accuracy. Amazing companies are pouring significant resources into their systems creating a considerable emerging market in the USA, NA, EU, UK, & Worldwide. One thing we know to be true, Commercialized Tidal Energy is a new way, and is here to stay.
Jonatahn Wade
Does this enable you to use a smaller cable to get to shore?
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Frédéric Navarro

Frédéric Navarro is the Paimpol-Bréhat tidal project director. He joined GE in 2001 as Commercial Manager for Power & Water in Belfort, France where he was in charge of proposal for large power generation plant, followed by another commercial role in the services side of the business in Milan, Italy. In 2009 he moved to GE Oil & Gas in Paris as a Sales Manager prior to joining GE Power Conversion in 2014. He worked in the Energy Vertical until later became the director for the Paimpol tidal project.