In 2017, engineers put a 1MW power machine shaped like a giant floating bird off Scotland; it ran for 2 years, riding out an 18.7-metre wave, before sinking

Nine years ago, a strange-looking machine was deployed off the coast of the Orkney Islands in Scotland. It rolled and wobbled with the waves, not standing rigid against them. That wobble had a purpose. The device, a 1 MW wave energy converter developed by Finnish company Wello Oy, was known as the Penguin, according to the U.S. Department of Energy's Tethys database. It was the culmination of years of earlier testing at the site, and in this latest form, it was designed to convert the chaos of the open ocean into electricity; for two years it did just that, through some of the roughest seas that Scotland could throw at it.

Why they call it the Penguin

The machine didn’t really look like a bird. Tethys records describe it as a floating hull 30 meters wide and 9 meters high, with a 7-meter draft, weighing more than 1,600 tons without ballast. Only a fraction of it was above the water. It was nicknamed “Penguin” because of the way it moved, pitching and rolling with each wave, like a penguin on land but gliding smoothly in water. The unusual motion was intentional. Inside the hull was a large spinning mass, almost like a flywheel, and it would spin faster as the waves rocked the device. That spinning motion ran a generator, creating electricity without hydraulics or a gearbox, using many of the same parts that go into wind turbines.


Anchored where the waves get violent

The Penguin was moored at the European Marine Energy Center test site at Billia Croo off Orkney, one of the roughest wave-testing grounds on earth. It first arrived there in 2011 and, after several years of testing and modifications, returned for a fourth and final deployment in March 2017. This time it remained connected to the grid and continued to generate power almost without interruption. And that was when the real test began. Orkney’s waters are often lashed by storms of the North Atlantic, and the Penguin was right in their path.

Surviving storms that would destroy many machines

Hurricane Ophelia in October 2017 sent some of the largest waves the North Atlantic had seen in decades crashing into the region. Waves reached a height of 18 meters and the Penguin kept generating power right through it, Wello said. Then came Storm Caroline, which pushed the limits even further. EMEC's own records show the device survived waves of up to 18.7 meters during that storm. To give an idea of the scale of it, an 18.7-meter wave would be about as tall as a six-storey building. Many human-built machines would be damaged in conditions like that. The Penguin's mooring lines and cable connection held. That wasn't a fluke. A European Commission progress report on the project noted the device ran uninterrupted for roughly 24 months, needing very little maintenance work in that time, and that its mooring system and electrical connection had shown themselves to be "commercially ready and relatively economical."

The machine that sank, but didn't fail

The Penguin began to take in water and sank at the test site on March 22, 2019, after only two years of its continuous operation. The engineers had been monitoring it very carefully during those last few days, but it eventually sank beneath the surface anyway. This might be a failure in theory. In reality, however, it was quite the opposite. By the time it sank, the Penguin had already met its original test goals. It showed that a floating device without a rigid frame could survive through years of Atlantic storms, generate energy continuously, and require little or no maintenance at all. Engineers got the real data from real ocean conditions they needed, the kind that no lab tank can fully replicate.

What its short, stormy life left behind

The lessons from the Penguin's four missions were incorporated straight away in its successor, an improved version known as WEC2. According to Wello's own figures, this new system was developed to surpass the former in terms of power production by 380%, though the company's materials don't specify whether that figure refers to peak output or total energy generated over time. Compared to wind and solar, wave energy remains a minor player in the renewable energy world. Machines like the Penguin could help change that over time. It showed that a boat bobbing and rolling in some of the stormiest water on the planet could survive there for years, not days, and that what engineers learned from watching it operate, and eventually fail, could become the blueprint for something sturdier. Sometimes engineering progress doesn't look like a triumphant launch. Sometimes it looks like a strange floating machine quietly sinking after it has done its job.