The archive · Climate & Energy · Technical decision · 2009–2026
CorPower's heart-pump wave bet: C4 proves storm survival and 600 kW grid export
Stockholm's CorPower bets heart-pump-inspired phase control can make wave energy cheap; its C4 weathered 18.5m waves and exported 600 kW in Portugal.
CorPower Ocean
What the business is
CorPower Ocean is a Stockholm-based wave energy company building the C4, a commercial-scale wave energy converter that uses heart-pump-inspired WaveSpring phase control to amplify power capture in normal seas and ride out storms, demonstrated grid-connected at Aguçadoura, Portugal.
Starting capital：B-round of €53M closed in 2025, including €17.5M from the European Innovation Council and strategic investment from Tokyo Gas's Acario Innovation and GTT; €40M EU Innovation Fund award for the VianaWave park; €30M Horizon Europe for Power Farm EU
How it started
Founded in Stockholm in 2009, CorPower spent more than a decade on research and structured verification before deploying its first commercial-scale machine. In August 2023 the C4 was towed out and connected at the Aguçadoura test site off northern Portugal, moored at 45m depth on a new UMACK anchor, starting an ocean commissioning program under the EU-funded HiWave-5 project.
What happened
During its first commissioning cycle the C4 verified every key system function, including grid power export up to 600 kW peak and remote monitoring from CorPower's control center. It weathered four major storms — including November 4, 2023's storm Domingos, which brought 18.5m waves, a record for the region — with machinery motion held to decimetres while the hull submerged; after each storm it re-commenced operations and grid export. Measured output from the WaveSpring phase control slightly exceeded the digital twin's predictions, with the power chain model matching data within 96-99%. In 2025 CorPower closed a €53M B-round, received a €40M EU Innovation Fund award for the VianaWave pre-commercial park off Viana do Castelo, and started manufacturing the next-generation C5 machines, targeting commercialization in 2027.
No ending yet — it is still running.
Background
CorPower Ocean, founded in Stockholm in 2009, builds wave energy converters whose selling point is a heart-pump-inspired control system: the WaveSpring phase control makes the device oscillate in phase with incoming waves to amplify power capture, and detunes it in storms so the machine barely moves. The bet is that adding tunable phase control to wave energy — the way wind turbines pitch their blades — finally solves the two obstacles that have kept wave power out of the market: survivability and efficient generation in ordinary seas.
In August 2023 CorPower deployed its first commercial-scale converter, the C4, at Aguçadoura, Portugal, at 45m depth on a UMACK anchor. Its first commissioning cycle verified grid power export up to 600 kW peak, remote monitoring and O&M procedures. It weathered four major storms, including November 2023's Domingos with 18.5m waves — a regional record — while machinery motion stayed within decimetres; after each storm it re-commenced grid export. Measured WaveSpring output slightly exceeded digital-twin predictions, with the power chain model matching data within 96-99%.
In 2025 CorPower closed a €53M B-round, received a €40M EU Innovation Fund award for the VianaWave pre-commercial wave park off Viana do Castelo, and started manufacturing its next-generation industrialized C5 machines, with commercialization targeted for 2027. The company counted 110 employees and was named to the Global Cleantech 100 for a second year.
What has to be true
- Wave energy's two historical killers are storm survivability and poor output in normal seas; CorPower's phase control addresses both in one mechanism, the way blade pitching fixed wind turbines.
- The C4's verified grid exports and storm record are hard data, not simulations — measured output even beat the digital twin's predictions, giving funders evidence to underwrite.
- European policy money — a €40M EU Innovation Fund award and €30M Horizon Europe grant — rewards tech that can reach 2030 cost targets, and CorPower timed its milestones to qualify.
- Strategic investors like Tokyo Gas's Acario Innovation signal that a wave device that survives storms can plug into an existing utility value chain, not just a subsidy program.
- By completing a full maintenance cycle — tow-out, operation, release and tow-back — CorPower proved the O&M loop that wave farms will depend on, de-risking the economics beyond the machine itself.
What can be applied
Survivability is the product, not a footnote: CorPower spent years proving its machine rides out storms, and phase control turned that risk into a selling point.
Aftermath
As of mid-2026 CorPower was refining the C4 at Aguçadoura with adjustments to lift peak power toward 850 kW, manufacturing the industrialized C5 machines, and developing the VianaWave pre-commercial park with €40M from the EU Innovation Fund, targeting commercialization in 2027. It had closed a €53M B-round with strategic investors including Tokyo Gas's Acario Innovation and GTT, and employed about 110 people, but had not yet sold commercial machines to utility-scale customers.
Sources
- CorPower Ocean announces wave energy breakthrough
- Critical breakthroughs for CorPower Ocean's wave energy converter
- CorPower Ocean annual report 2025
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