TL;DR:

  • Wave energy converts ocean surface wave motion to electricity — distinct from tidal, which uses tidal flow. The UK has the third largest wave energy resource in the world, particularly along the Scottish and Welsh Atlantic coasts
  • CorPower Ocean and Mocean Energy have both reached survivability milestones in 2025-2026 testing at EMEC in Orkney, moving the sector from perpetual prototype stage toward early commercial arrays
  • Wave Energy Scotland’s funded development programme and the UK government’s marine energy support have kept the sector alive through difficult economics; the question now is whether the cost of energy can fall fast enough to attract private project finance

Wave energy is the renewable sector that has been “almost there” for longer than most. The resource is enormous — the Atlantic coast of the UK receives consistent, powerful wave energy that in theory could generate significant amounts of electricity. In practice, devices sent out to capture that energy have a persistent habit of being destroyed by the same storms that make the resource attractive. Getting the survivability right without making devices too expensive to generate power economically has been the engineering challenge for thirty years.

2026 is seeing some genuine resolution to that challenge.

The UK’s Wave Resource

Wave energy potential is typically measured in kilowatts per metre of coastline. The UK’s western-facing coastline — the Hebrides, the Western Isles, the Orkney coast, Wales, Cornwall — receives some of the highest average wave power densities in Europe. The Carbon Trust estimated the technically extractable resource could be in the tens of gigawatts, though the commercially accessible fraction is considerably lower.

The distinctive characteristic of wave energy compared to tidal is variability. Tidal energy is predictable on daily and monthly cycles, which makes it valuable for grid balancing. Wave energy follows weather systems — stronger in winter, calmer in summer, and significantly variable day to day. That variability reduces its value as a dispatchable resource but doesn’t eliminate it; wave energy is often out of phase with wind and solar, which gives it some value in a diverse portfolio.

The Testing Infrastructure: EMEC

The European Marine Energy Centre in Orkney is central to UK wave energy development. EMEC operates the world’s only purpose-built marine energy test facilities — offshore wave test sites at Billia Croo and offshore tidal sites at the Fall of Warness. Both sites have grid-connected berths where developers can deploy devices at full scale in real ocean conditions and measure actual generation.

The Orkney location is both an asset and a challenge. The wave conditions at Billia Croo are genuinely representative of commercial deployment conditions — extreme storm waves are part of the test. Devices that survive Orkney winters have demonstrated a level of durability that warmer, calmer test sites can’t validate. Several previous wave devices had failed at this stage; the devices still standing in 2026 have passed a filter that matters.

Who’s Still Standing

CorPower Ocean is the developer that has attracted the most attention in recent years. The Swedish company’s C4 device uses a pneumatic system with a gyroscopic pitching mechanism that responds to wave forces rather than rigidly resisting them — the company describes it as a “wideband resonant” approach. A full-scale C4 device survived its first Atlantic winter at EMEC in 2024-2025, including storms significantly above design specification. That survivability milestone was a meaningful inflection point; previous CorPower prototypes hadn’t reached it. The company is now working toward a demonstration array of multiple devices, which would be the first multi-device wave array at commercial scale from this generation of technology.

Mocean Energy operates from Edinburgh and takes a different approach with its Blue Horizon device — a hinged raft that flexes along its length as waves pass beneath it, generating power through that flexing motion. Mocean Energy has also been testing at EMEC and in 2025 completed a deployment that demonstrated the device generating power while surviving the test site conditions. They have additionally been exploring a combined wave-tidal system for remote coastal charging of autonomous underwater vehicles — a niche but commercially interesting application where the economics are different from grid power.

Bombora Wave Power (now primarily backed by Australian investment but with UK testing activity) uses an entirely different approach: the mWave device is a flexible membrane embedded in a steel structure fixed to the seabed. As waves pass overhead, pressure changes in the water cause the membranes to flex, driving compressed air through turbines. Testing in UK waters has continued through 2025-2026.

AWS Ocean Energy in Aberdeen has been developing the Archimedes Wave Swing — a fully submerged device that avoids some of the survivability problems of surface devices. Submerged structures experience much lower wave forces during extreme storms, but the energy capture efficiency is also lower. AWS has been exploring specific markets where the low-visibility, submerged profile is valuable.

The Economics Problem

Wave energy costs are still well above grid parity and above offshore wind costs. Estimates for the levelised cost of energy from early wave arrays range from £150-300/MWh, compared to around £40-60/MWh for offshore wind at scale.

The cost reduction pathway exists — economies of scale in manufacturing, improved installation methods, shared infrastructure within arrays, and learning-curve effects on operations. But those economies of scale require someone to build the first arrays at scale, which requires project finance, which requires lower costs. It’s the same circularity that tidal faced a decade ago and is still working through.

Wave Energy Scotland’s programme has been the mechanism for publicly funded development, co-funding testing, component development, and cost reduction research. The UK government’s Longer Duration Storage and Innovation Fund and the Contracts for Difference scheme (which marine energy can in principle access) provide additional support pathways, though CfD allocation for pre-commercial technologies remains challenging in practice.

What 2026 Means

The sector is at a different position than it was five years ago, when multiple companies were still at prototype scale with no full-scale survival demonstrations. The devices that have survived Orkney conditions represent genuine technical progress. The question for the next few years is whether private project finance will follow the technology milestones, or whether wave energy will continue to require public support to reach the scale at which the economics improve.

For the UK’s net zero trajectory, wave energy is one of several technologies that could contribute to a diversified offshore renewable mix — particularly valuable for Scottish island communities and for adding seasonal diversity to a renewable portfolio dominated by wind. Whether it gets there depends as much on financing and supply chain development as on the underlying technology, which is finally starting to demonstrate it can survive.