Is Wave Energy Commercially Viable Yet? What 2026 Shows

In July 2026, a 100-tonne (110-ton) buoy anchored off northern Portugal earned a full DNV certificate. It was the first wave energy converter, a machine that turns wave motion into electricity, to do so. DNV is the Norwegian certification firm that offshore energy projects treat as a benchmark. A month later, on 27 August, Oregon State University opened PacWave South, a grid-connected test site seven miles (11 km) off Newport, Oregon. Four test berths, each with a power cable to shore, were ready, but no wave device had arrived to use them.

So is wave energy commercially viable? Partly. The engineering is closer than it has ever been to something lenders could back. Almost every timeline has slipped, though, and wave electricity costs several times more than offshore wind.

How Wave Energy Technology Has Changed Since the First Pilots

Wave Energy Converters by Location: Surface, Shore, Subsurface and Seabed

EMEC, the European Marine Energy Centre in Orkney, Scotland, lists eight main types of wave device. They are easiest to compare by where the device sits.

Surface devices meet the most energetic water. Shore-mounted ones are easier to reach. That is why Eco Wave Power attaches its floaters to existing jetties and breakwaters instead of anchoring them offshore. Our earlier article on emerging small-scale wave energy technologies covers more of the smaller devices.

How Newer Wave Designs Work: Air Chambers and Phase Control

One principle is the air chamber, formally the oscillating water column: rising and falling water pushes air through a turbine. It powers Mutriku, a plant built into a breakwater on Spain’s Basque coast. Its 16 turbines add up to 296 kW, and it has fed the grid since 2011. A peer-reviewed study of 2014 to 2016 measured a capacity factor of 0.11. That means the plant delivered 11 percent of what it would produce at full power all year, and other renewables are reported to do better.

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Another is phase control: timing a buoy’s movement to the rhythm of the waves, like pushing a swing at the right moment. CorPower’s WaveSpring does this with a mechanism that works like a spring, invented at the Norwegian University of Science and Technology. In a 1 m (3 ft) wave, the machinery moves up to 3 m (10 ft). The company’s own test paper reports three times more power absorbed than without the spring.

Wave Power in an Island Microgrid: The King Island Example

A wave device rarely works alone. On an island it has to fit into a microgrid, a small local grid that balances its own supply and demand. Our piece on small-scale ocean energy for sustainable communities covers the wider idea. King Island, in Bass Strait about 80 km (50 mi) off Tasmania, shows what one island grid looks like. It has no link to any mainland network. Diesel once supplied everything from a 6 MW station, serving about 12 GWh a year with demand peaking at 2.5 MW.

Today wind, solar, a 3 MW battery and two flywheels, heavy spinning wheels that smooth sudden swings, keep the system stable. Hydro Tasmania says the island runs without diesel for roughly a fifth of the year, and renewables cover about 65 percent of its energy. Annual diesel use fell from 4.5 million litres (1.2 million US gallons) to about 2.6 million (0.7 million US gallons), a 2023 review found.

In 2021 a 200 kW UniWave unit from Wave Swell Energy joined that mix. It is also an air-chamber design, with an artificial blowhole that pushes air through a turbine. It was installed on 10 January 2021, exported its first power on 18 June 2021 and ran until March 2023. The developer reports conversion rates of up to 50 percent, meaning the share of wave energy turned into electricity. Researchers expect groups of devices to smooth each other’s output, with flywheel and battery hybrids handling the rest.

Two modelling studies by CSIRO, Australia’s national science agency, suggest that adding wave power to wind, solar and batteries cuts the storage a grid needs. One found that covering multi-day supply gaps then needs less than half the capital cost of a system without waves. A newer study reports savings of up to 80 percent, but wave developers commissioned or joined both studies, and both model hypothetical grids.

Why Pioneering Wave Energy Projects Fell Short of Their Promises

Pelamis and CorPower: One Site, Two Generations of Wave Technology

Pelamis Wave Power was the best-known name of the 2000s wave energy boom, and its snake-like machines flexed with the swell. In 2004 a prototype at EMEC became the first offshore wave machine to feed electricity into a grid. In September 2008, three machines totalling 2.25 MW started work at Aguçadoura, off northern Portugal. They were the start of a planned fleet of 25.

Within months all three were towed back to port, though accounts differ on the timing. One source says the farm shut down two months after its official opening, another that it ran for about five weeks. Leaks and other technical problems played a part, and so did the collapse of the project’s main backer, Babcock & Brown. One trade publication later blamed survivability, a device’s ability to withstand storms, while other accounts stress the financing.

Pelamis went into administration, a UK insolvency process, in November 2014. Wave Energy Scotland, a publicly owned body, then took over the assets and intellectual property. It published the lessons in an open knowledge library. Tests of the first-generation machine at EMEC had already led to a second generation.

The same site off Aguçadoura returned to the story in 2023. CorPower’s C4 is a teardrop-shaped buoy, 9 m (30 ft) wide and 18 m (59 ft) tall. It sits 4 km (2.5 mi) offshore in 45 m (148 ft) of water. On 4 November 2023, sensors recorded waves up to 18.5 m (61 ft). The machinery motion shrank to under a metre (3 ft), and the C4 fed power to the grid again after each of four storms.

Coverage of the award says certification took seven years. The storm results come from the developer, and I found no independent repeat of them.

Gibraltar’s 5 MW Promise and the 100 kW That Was Built

Not every promise was about a large wave farm. In 2016, Eco Wave Power’s Gibraltar array switched on eight floaters at the Ammunition Jetty. Together they made 100 kW. The contract was a 25-year deal to sell the electricity locally. The plan was to grow to 5 MW and supply up to 15 percent of Gibraltar’s electricity by 2020.

Gibraltar was never a high-energy site. The company’s founder has said that 15 years of meteorological data showed fairly low waves there. The site offered other things: an existing jetty and a long contract with the government.

The expansion to 5 MW never came. The system was taken down in 2022. The floaters were scrapped, and the equipment that turns their motion into electricity was shipped to Los Angeles. The company named its growing interest in the US market as the main reason. By its own account, operating costs excluding staff fell from 18 percent of capital cost in 2017 to 3.2 percent in 2021.

Wave Energy Cost and Output: A Realistic Look

A Calculated Example: One Wave Farm on King Island

This is a calculation, not a forecast. Imagine a 1 MW wave farm on King Island that runs at full output all year, delivering 8,760 MWh. At Mutriku’s measured capacity factor of 0.11, it would deliver about 960 MWh, roughly 8 percent of the island’s 12 GWh (12,000 MWh).

CorPower’s own website claims a capacity factor of 40 to 60 percent. At those values the same farm would deliver 3,500 to 5,260 MWh, or 29 to 44 percent of the island’s demand. The spread shows how little operating data exists for wave farms.

Even the best case leaves out the island’s existing renewables. With about 65 percent already covered, wave power would be a third source next to wind and solar.

Wave Energy Cost per MWh Compared With Diesel, Solar and Offshore Wind

The cost figures are less encouraging. Analysts compare generation options by their levelised cost of energy (LCOE), the average cost per MWh over a project’s life. The EU’s Joint Research Centre tracks these costs in its 2025 ocean energy status report. Most comparison figures come from IRENA, the International Renewable Energy Agency. The table mixes measured averages and model results, and the notes say which is which. Figures stay in the currency of their source.

On these figures wave energy costs roughly two to ten times as much as offshore wind, before any currency conversion. Island diesel narrows the gap, because fuel delivered by ship is expensive. Whether wave power is economically viable on an island depends mostly on the diesel price it replaces. A model of a remote Indonesian island found that wave power combined with floating solar cost $306 to $382 per MWh. Diesel cost $246.

Solar and battery prices keep falling. According to IRENA, large solar plants averaged $44 per MWh globally in 2025, and battery storage cost $197 per kWh in 2024. Wave energy has no comparable record of falling prices yet, with so few devices deployed. Experts surveyed by the US National Renewable Energy Laboratory in 2022 put wave energy at $570 per MWh ($0.57 per kWh) in 2020, on average. In the conservative case they expected $300 per MWh ($0.30 per kWh) around 2033, give or take eight years. That remains about four times the offshore wind average of $78 per MWh, by my arithmetic.

How Wave Energy Devices Survive Storms: Tuning, Lifting and Submerging

A wave device has to live in the same water it harvests. Engineers call this challenge survivability. Devices often fail during extreme storms, according to a 2023 conference paper on submerged buoys.

CorPower tunes its buoy to the sea. In calm conditions the WaveSpring amplifies motion. In storms it detunes, meaning the buoy stops matching the rhythm of the waves, and the motion shrinks.

Eco Wave Power lifts the floaters above the water and holds them there until the storm passes.

CETO winds its submerged buoy deeper on tethers, which cuts the force of the waves. Making electricity then takes second place, because the controls aim to minimise motion.

A University of Adelaide study compared floating and fully submerged buoys. The submerged ones survive storms better, but they generally capture less power from longer waves and work over a narrower range of waves. Each method trades output for safety, and the evidence so far comes mostly from the developers. Staying on land does not remove the risk. The breakwater at Porto, where Eco Wave Power plans its first 1 MW installation, was damaged by storms. Repairs by the port authority began in 2026, and the company has asked for more time on its grid-connection deadline.

Wave Energy Outlook to 2030: Delays, Planned Wave Farms and the Numbers to Watch

PacWave South itself took nearly 15 years to plan, permit and build. It is pre-permitted for most wave technologies, so developers need no separate permits. A US federal power agency agreed in 2025 to buy the electricity produced during tests. Developers expected the first devices in 2026. Generation is now expected in 2028, after funding cuts and delays affecting participating developers.

The pattern of 2026 is delay. CorPower once aimed for a wave farm lenders could finance by 2026 or 2027. Its 10 MW VianaWave farm in Portugal, backed by a €40 million EU grant, now targets 2029 to 2030.

At the end of 2025 the EU Blue Economy Observatory counted 650 kW of operating wave capacity in the European Union, excluding pilot projects. Five publicly funded wave farms, with 66 devices and 24 MW in total, are due by 2030. That would be about 37 times the current 0.65 MW, a large jump, though still modest in absolute terms.

Wave energy now has a certified buoy, but it still lacks a price that works.

Industry body Ocean Energy Europe estimates that ocean energy could in principle supply 13 percent of global electricity demand. That figure describes the resource and commits nobody to building anything. For the newer offshore designs, a capacity factor measured over a full year at a wave farm would show what the machines deliver. A contract price that a utility is willing to sign would show whether wave energy is commercially viable.

Frequently Asked Questions

How does wave energy work?

Wave devices turn the motion of water into electricity. A moving float or flap drives a generator, or rising water pushes air through a turbine. The first table above sorts the main designs by where they sit.

How much does wave energy cost per kWh?

The EU reports an average of about €0.27 per kWh, and IRENA’s 2021 range is €0.16 to €0.75. Offshore wind averaged $0.078 per kWh globally in 2025, according to IRENA.

Why did Pelamis Wave Power fail?

Technical problems, including leaks, and the collapse of its main backer ended the Portuguese farm in 2008. The company went into administration in 2014.

Can wave energy survive storms?

Some designs have, according to their developers. CorPower’s C4 fed power to the grid after four storms with waves up to 18.5 m (61 ft). No independent repeat is reported in the sources reviewed.

Can wave energy power an island?

Not alone, on current evidence. A 200 kW unit supplied King Island’s grid from 2021 to 2023. The island already gets roughly 65 percent of its energy from wind, solar and batteries.

How does wave energy compare with solar and offshore wind?

It costs several times more per MWh today, so it is not yet cost-competitive with either. Its advantage is timing: waves arrive differently from sun and wind, which could reduce the storage a grid needs. The studies behind that claim are modelling work linked to developers.

Wave energy may yet earn a place on islands and in ports. Until delivered kilowatt-hours and signed prices appear, I will treat everything else as promise.

Acknowledgment of AI

Content developed using AI technology, reviewed to ensure clarity, coherence, and accuracy before publication