England plans 47,000 floating solar panels on Cavendish Dock, turning port water into an industrial power source
Cavendish Dock is located on the outskirts of Barrow-in-Furness. This is a dock covering 6,361,000 square feet of water surface with anglers throwing their nets into the water only on weekends. This dock has had an unusual history: during World War II, it was being used for the construction of airships. Since then, Cavendish Dock has been at rest.
This situation is about to be changed very soon, however. Planning permission has been recently granted for the creation of the largest floating solar panel array in the United Kingdom, consisting of almost 47,000 panels.
A dock with a double life
The story of Cavendish Dock is deeper than one would imagine from looking at its quiet surface. At present, it is completely enclosed, meaning that the dock is effectively an inland reservoir hidden in a port. This enclosure is what allows the use of floating solar technology since the water will not move anywhere.
The UK’s first major floating solar project was the commissioning of the 6.3 MW solar farm in March 2016 on Queen Elizabeth II Reservoir, just outside London.
Another element that adds to the mysterious nature of this place is its involvement in the war efforts, which took place many years ago. In World War II, the dock became a home to an airship building project. While this seems distant, there is something fitting about the project chosen for this location at present.
Over the last few decades, however, the character of the dock changed to become one of recreation: people visit this place to fish and relax near the water while not thinking about the infrastructure in front of them.
What 47,000 panels on water actually look like
The scale of the project might initially seem difficult to envision. Essentially, 47,000 panels will be installed in an area that occupies roughly one-third of the water surface area of the dock, not a test, but rather a full-scale operation covering a very large volume of water.
Each of the panels will be affixed to pontoons, which will float on the dock and be secured to the bottom of the dock, angled in such a way as to optimize the production of power by the panels and oriented to capture the sun throughout the whole day. The mounting system has been configured so as not to disturb the dock bottom, and at maximum power output the system will produce up to 40 megawatt-peak (MWp) of power.
Power for factories, not just homes
What sets this solar energy initiative apart from other renewable energy ventures? The fact that the electricity will not be delivered to houses.
It is estimated that the array will produce enough energy to power 14,000 households per year; however, it is a benchmark number rather than a goal. The end result of the venture is to deliver electricity to local businesses to decrease expenses on electricity, to minimize carbon emissions and to increase energy security for adjacent businesses. Moreover, using water as opposed to land as an array location means saving land space in the port.
Barrow’s bigger ambition
Planning approval came from Westmorland & Furness Council‘s Strategic Planning Committee on November 24, but the project sits inside a much larger set of ambitions for the region.
ABP frames Barrow EnergyDock as a direct investment in the Furness area’s advanced engineering sector — an economy that needs reliable, affordable industrial energy to grow. Bryan Davies, ABP’s Divisional Port Manager for Northwest and Scotland, described it as “a major milestone in realizing ABP’s exciting plans for the Port of Barrow.” ABP already operates solar farms at Barry, Silloth, Southampton, Hull, and Humber. At its full 40 MWp capacity, this project would make ABP one of the UK’s largest corporate solar producers — a concrete step toward the company’s net-zero operational emissions target for 2040.
Floating solar’s quiet rise across the UK
The UK’s first major floating solar project was the commissioning of the 6.3 MW solar farm in March 2016 on Queen Elizabeth II Reservoir, just outside London. This is linked to the private grid of Thames Water through a power purchase agreement and meets about 20% of the power demands of the facility, according to Associated British Ports.
But Barrow EnergyDock will make this one pale in comparison, boasting of an output capacity of up to 40 MWp.
That gap tells a broader story. Water surfaces — reservoirs, docks, flooded quarries — were long overlooked as sites for renewable infrastructure, treated as obstacles rather than assets. Now they’re being reconsidered. Barrow suggests that some of the most useful energy real estate in the country may have been sitting quietly in plain sight all along, and the question worth sitting with is how many other still surfaces are waiting for the same second look.
Kelly is an experienced writer with 15 years of experience exploring the big stories that shape our world, from tech breakthroughs and space exploration to climate, energy, and the fascinating quirks of science. She has a talent for turning complex ideas into sharp, memorable insights that stay with readers long after they’ve finished reading.
