Tidal power has always been one of those renewable energy ideas that sounds brilliant in theory—predictable, clean, and totally unaffected by weather. But the ocean is a tough place to build anything, let alone a turbine that’s supposed to stay underwater for years without falling apart. That’s why the latest breakthrough from Scotland matters more than it might seem at first glance.
A tidal turbine off the northern coast of Scotland has just quietly set a record. Sitting on the seabed in the Pentland Firth, one of the fastest-flowing tidal channels in the world, the turbine has been generating electricity for over six and a half years without needing a single unplanned maintenance visit. The milestone, which was confirmed this month, shows that tidal power might finally be stepping out of the experimental phase and into something far more reliable.
The turbine is part of the MeyGen project, which has been running off the Caithness coast since 2016. According to a report by the Associated Press, the four turbines currently in place generate enough electricity to power around 7,000 homes. That’s modest by national standards, but the real success lies in the consistency. Unlike wind or solar, tidal currents are steady and predictable. And now that the hardware has proved it can last, confidence in scaling up is growing fast.
It’s not just about power, it’s about staying power.
One of the reasons tidal energy has lagged behind other renewables is that it’s expensive to maintain. Offshore infrastructure is notoriously vulnerable to damage from storms, salt corrosion, and sheer mechanical wear. Pulling a turbine up from 40 metres below the sea every time something goes wrong just isn’t feasible on a commercial scale. That’s why this particular turbine’s performance is being treated as a major step forward.
Trade association Ocean Energy Europe called it a “very significant milestone” and pointed to the durability of components like bearings and seals made by Swedish engineering firm SKF, which appear to be holding up under brutal marine conditions. This kind of reliability is what could finally convince cautious investors and governments that tidal power deserves serious backing.
The team behind the MeyGen project, SAE Renewables, has ambitious plans for expansion. They want to add 20 more turbines to the site by 2030, with a long-term goal of reaching 130. If they get there, MeyGen would become one of the largest tidal power arrays in the world. A detailed update published by Euronews Green highlighted the project’s potential and stressed that the durability breakthrough could lower the cost of energy over time, something that’s critical if marine renewables are going to compete with more established sources.
What’s happening in the Pentland Firth could reshape global energy.
The Pentland Firth has been called one of the best tidal energy sites on the planet. With powerful, predictable currents reaching speeds of up to five metres per second, it’s a natural testbed for tidal turbines. But until now, even the best prototypes struggled with wear and tear. Six years without a service call is a solid rebuttal to that scepticism.
Experts in marine energy have long argued that tidal power has enormous potential. A recent analysis by the US-based National Renewable Energy Laboratory described marine energy as the world’s largest untapped renewable resource. That includes wave and tidal power, but the big challenge has always been scaling it up in a way that’s both cost-effective and environmentally responsible.
Andrea Copping, a scientist at the Pacific Northwest National Laboratory, told Euronews that the next hurdle isn’t the technology, it’s regulation. While the turbine’s durability is a breakthrough, further expansion will need to factor in shipping lanes, local wildlife, and community input. Copping said that as long as developers are willing to address these issues early on, large-scale deployment is absolutely within reach.
This point is especially relevant in the UK, where environmental protections and planning laws are rightly robust. But there’s also a real opportunity here. If MeyGen continues to deliver, it could open the door for similar projects around the coast, from Orkney to Anglesey. Many island communities still rely on expensive or polluting forms of energy. Tidal power could give them a clean, reliable alternative.
It provides steady source of energy in an unstable climate.
This is one of the world's most powerful tidal #Energy turbines. It can power over 2,000 homes.
We have so many solutions. Implement them. #ActOnClimate#climate #Energy #GreenEnergy #Environment #Sustainability pic.twitter.com/0Z6IDBwah0
— Mike Hudema (@MikeHudema) November 5, 2025
The timing couldn’t be better. As Europe faces growing energy demands and increasingly erratic weather patterns, predictable sources like tidal power are becoming more valuable. While solar and wind remain the backbone of most renewable strategies, both are subject to dips in supply. Tidal energy, on the other hand, runs like clockwork, literally following the rhythm of the moon.
This predictability means tidal power can play a unique role in balancing the grid, filling in gaps when other renewables aren’t producing. And because the turbines sit below the surface, they avoid the land-use debates and visual objections that often come with wind or solar farms.
There’s also growing interest in combining tidal power with green hydrogen production. In Orkney, a separate project is already using wind and tidal energy to power electrolysers that split water into hydrogen and oxygen, creating clean fuel that can be stored or shipped. If places like MeyGen can replicate that model, they’ll not only produce electricity but also help build the infrastructure for a future beyond fossil fuels.
Backers of marine renewables say the UK has a chance to become a global leader in this space, much like it did with offshore wind. The Scottish government, in particular, has thrown its support behind emerging technologies, including tidal and floating wind, as part of its net-zero targets.
Still, none of it will happen without political will and long-term investment. Marine renewables aren’t just competing with fossil fuels anymore. They’re up against cheaper renewables, too. But if the past six years have shown anything, it’s that durability no longer needs to be a question mark.
Tidal power won’t replace every other source of energy. But in the right places, with the right backing, it can offer something few others can: quiet, consistent, zero-emissions energy that just gets on with the job.