Perpetual, India’s leading player in energy transition to nano nuclear, agro voltaics, ocean wave, clean coal and biogas just unveiled a radically new design for perpetual energy from the sea accompanied by an ultra low cost desalination system. The promise is power which is cheaper than solar, has system design life which is more than solar and DOESNT require any land.
The central proposition of Perpetual is that we cannot use scarce land or even scarcer water to produce power. Further power needs to be cheap, abundant and 24/7. So they have created a circular economy power system which neither consumes land nor power and is net zero. The model has attracted global attention as one that is radical but possibly practical. Their study suggests that river dams are bad for the ecology and should be dismantled. And that green chemistry ecosystems need to be dismantled.
One needs to analyse these claims given that they come from a highly credible source. Unit Cost is one factor. But absolute quantum’s also matter. For example does the technology scale to hundreds of gigawatts and is the manufacturing process for capital goods sustainable. There are related issues like safety and maintenance also to be considered.
And if the technology has precedents and validation elsewhere.
France has a 12-kilometer seawall off the coast of Brittany. It encloses 3,400 hectares of water. The wall itself is the generator. Inside the structure are 90 bidirectional turbines. When the tide rises, water pushes in. When it falls, water pulls out. It creates electricity in both directions across all four daily tidal cycles. That means 270 megawatts of continuous, weather-proof power for 200,000 homes.
But the most interesting part is what happened to the water inside. Within two years, the enclosed section became an accidental marine sanctuary. Fish populations are 340 percent higher inside the lagoon than in the open water just on the other side of the wall.
It is a blueprint.
Any coastline in the world with a five-meter tidal range can replicate this.
The biggest advantage of tidal energy over wind and solar is absolute predictability. The tides are dictated by the moon and the gravitational pull of the earth. We know exactly when the water will move, down to the minute, decades in advance.
By housing the generation equipment inside the physical structure of a seawall rather than anchoring it out on the ocean floor, engineers also solved the traditional offshore maintenance problem. Saltwater aggressively degrades submerged machinery, and sending divers out in harsh conditions is dangerous and expensive.
But that is only the first part of the perpetual affordable power (PAP) plan. They propose to draw cold water from below the ocean and use that to produce desalinated water as well as provide geothermal air conditioning using super critical CO2.
The plan seems set to roll. Do repost this with views to get wider feedback.
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2026