Channel Islands: Riding the Tide to a Sustainable Future

Harnessing one of the world’s most powerful tidal resources

Blessed with one of the largest tidal ranges in the world – experiencing differences of up to 12 meters between high and low tide – the Channel Islands possess an extraordinary, untapped resource: tidal power. Unlike intermittent solar or wind, the tides are a predictable, constant force, offering a reliable backbone for a sustainable energy grid.

Unstable imports, high prices – and a push for change

The Bailiwick of Guernsey, comprising the main island, and the smaller islands of Herm, Sark and Alderney, has long relied on a temperamental cable connecting it) to France and its mainly nuclear electricity grid. The back-up of some industrially beautiful but environmentally costly diesel engines, and the constant threat of disconnection, has resulted in fluctuating (i.e. high) energy costs. However, a new wave of innovation is hopefully set to change this, with pioneering companies like Spiralis Energy in Alderney leading the charge to harness the power of the surrounding waters.

Proven innovation abroad points the way forward

One of the most promising recent developments in tidal energy technology has come from Proteus Marine Renewables with their AR1100 tidal turbine. This megawatt-scale device has already proven its mettle in challenging environments, with successful deployment and grid connection in Japan. This new turbine demonstrates the maturity and reliability of modern tidal energy solutions. Its ability to efficiently capture energy from tidal currents and its proven operational success highlight the viability of such technology for the Channel Islands.

Home-grown technology

In Alderney, however, it is the innovative approach of Spiralis Energy, with their groundbreaking Axial Skelter device, that is particularly exciting. Spiralis Energy is set to become the first tidal energy developer to test its technology in Alderney’s formidable waters, known for having some of Europe’s strongest tidal currents. This is a crucial step towards reducing that island’s dependence on diesel-powered generation and will hopefully spur its largest neighbour (us) to follow suit.

The Axial Skelter stands apart from traditional turbines. Rather than looking like a traditional wind turbine, its design is inspired by the natural geometry of turritella shells. The lack of sharp edges, and a single moving part minimises the environmental impact of the plant while efficiently generating lift and torque from tidal currents. Even more excitingly, its construction is 3D printed and uses 100% recycled plastic and a repurposed steel frame, making it incredibly sustainable and rapidly manufacturable – a significant advantage in scaling up deployment.

Community investment and environmental commitment

Beyond their environmental commitments and technological innovations, Spiralis Energy is also trying new ways of funding projects. Their Tides2Tea campaign allows locals to buy into the turbine and have their names on the actual machine. It is designed to engage the public, at the same time as demonstrating the tangible benefits of tidal energy by symbolising its power in terms of everyday comforts. This initiative, coupled with Spiralis’ close collaboration with local bodies such as the Alderney Wildlife Trust, underscores a modern approach to renewable energy development that prioritises both technological advancement and environmental stewardship. Sensors and cameras will monitor marine life during tests, with data openly shared to ensure minimal ecological disruption.
A blueprint for energy independence

The Alderney project represents a vital stepping stone for the islands and for tidal power generation more widely. By proving the Axial Skelter’s efficacy in one of the world’s most dynamic tidal environments, Spiralis Energy aims to pave the way for wider adoption across the Channel Islands and beyond. The predictability of tidal energy, offering a consistent power supply regardless of weather, positions it as a cornerstone for a truly resilient and sustainable energy future for these islands.

The Channel Islands are not just observing the energy transition; they are actively shaping it, harnessing their natural strengths to create a cleaner, more secure future. As tidal power moves from potential to practical, operators should take note: this is a region to watch, invest in, and learn from.