Canada's Bay of Fundy, renowned for its extreme tidal conditions, has long been a challenge for tidal energy developers. The region's powerful currents and unpredictable tides have proven devastating for traditional, seabed-mounted turbines, resulting in numerous failures and a growing graveyard of discarded machinery. However, a groundbreaking development in tidal energy technology offers a glimmer of hope for the future of this renewable energy source.
The focus is on the Orbital O2, a 680-ton floating tidal turbine designed by Orbital Marine Power. What sets this machine apart is its innovative design, allowing it to be towed away when conditions become hazardous, a feature that could be the key to its long-term success. The O2's retractable legs and floating platform enable it to navigate the treacherous waters of the Bay of Fundy, a feat that traditional, seabed-mounted turbines have failed to achieve.
Orbital's next-generation turbine, the O2-X, is set to make waves in the industry. With a power output of 2.4 MW per unit, the O2-X is expected to be deployed in Orkney, Scotland, by 2028. This new design features six turbines, each with longer blades, increasing the rotor swept area by a remarkable 70%. The MAXBlade project, a collaboration with Orbital, aims to create the longest tidal blades in the world, promising a significant reduction in costs.
The Bay of Fundy, with its formidable tides, serves as a stark reminder of the challenges faced by tidal energy developers. The region's extreme conditions have claimed numerous turbines, including those from OpenHydro, a company that filed for bankruptcy after its turbines failed to withstand the powerful currents. However, the approval of three floating O2-X turbines in the Minas Passage marks a turning point.
The partnership between Orbital and Eauclaire Tidal, facilitated by Fisheries and Oceans Canada, is a significant step forward. The project, known as FORCE (Fundy Ocean Research Centre for Energy), is the first to move ahead under Canada's revised tidal permitting process. This streamlined approach allows developers to start with a single device and expand as environmental monitoring progresses, offering a more flexible and efficient path to tidal energy development.
Despite the progress, tidal energy remains an expensive endeavor. The UK's Contracts for Difference auction in 2024 contracted tidal stream projects at £172 per megawatt-hour, significantly higher than fixed offshore wind's £58.87. However, tidal energy's predictability, driven by the Moon's influence, sets it apart from wind and solar power, making it a valuable asset for grid operators seeking reliable, consistent energy sources.
As Orbital prepares to deploy its turbines in the Bay of Fundy, the company faces a daunting task. The region's extreme conditions and a history of turbine failures serve as a constant reminder of the challenges ahead. Yet, the floating design of the O2 and O2-X turbines offers a promising solution, potentially transforming the future of tidal energy and paving the way for a more sustainable and resilient energy landscape.
