Harnessing Energy (Gerard Olsthoorn)

Power from the Estuary

Estuaries. Rivers pour freshwater into the ocean. The chemistry of the water changes at the boundary. Salt concentrations create a gradient. Osmotic pressure forces ions through a membrane. This movement generates electricity. Carbon stays in the soil. The sky remains clear.

I used to think this technology would never compete with solar panels, but I was wrong.

Engineers have solved the problem of friction. They carved holes into materials. These holes are smaller than pollen. Slippery linings inside the tubes let the ions glide. Resistance vanishes. Efficiency climbs. The current flows into the grid.

Believe it or not, the salt in the water acts as a battery. I’m skeptical, but the data from ScienceDaily shows a massive increase in energy density.

Laboratory tests prove the concept. Scaling the tech requires ceramics and carbon. Avoid the use of rare metals. Focus on the coastline. Build the plants near the river mouths. Harvest the tide.

Extended Cut

Pressure retarded osmosis uses the osmotic pressure difference to drive a turbine. Reverse electrodialysis creates a battery from the ions.

Researchers at the EPFL in Switzerland found that single-layer membranes increase output. This method utilizes the potential of every river on the planet. Invest in the infrastructure. Replace the coal stacks with osmotic stacks. The energy density of a river mouth equals a dam of one hundred meters in height.

Systems function twenty-four hours a day. The weather does not stop the flow of ions.

What got you thinking

The global water cycle. Evaporation lifts water. Gravity pulls it back to the sea. The salt remains. This cycle represents a massive thermal engine. The mixing of freshwater and saltwater releases energy as heat.

We must capture that energy as electricity instead. Study the Statkraft pilot project in Norway. It was the first attempt at a commercial scale. Look up the REDstack project in the Netherlands. They use reverse electrodialysis on the Afsluitdijk. Research the thermodynamics of mixing.

Case study: The Rhine-Meuse Delta energy potential. Read Blue Energy by Gerard Olsthoorn. Explore the work of Sidney Loeb.