Japanese Water +Seawater Power Generation

'Just figured'???? I rememeber reading about this process at least 20 years ago...
 
"Here is one we made earlier"
Three, in fact.
https://en.wikipedia.org/wiki/Pressure-retarded_osmosis
Statkraft opened the world's first osmotic plant with capacity of 10 kW, on 24 November 2009 in Tofte, Norway.[7] It had been estimated that PRO could generate 12 TWh annually in Norway, sufficient to meet 10% of Norway's electricity demand.[8]

In January 2014, Statkraft terminated their pilot project [9] due to economic feasibility concerns.

Starting in 2021, SaltPower was building another commercial osmotic power plant in Denmark using brine from a geothermal power plant.[10]
Click to expand...
https://en.wikipedia.org/wiki/Reversed_electrodialysis
In 2006 a 50 kW plant was located at a coastal test site in Harlingen, the Netherlands,[3] the focus being on prevention of biofouling of the anode, cathode, and membranes and increasing the membrane performance.[4][5] In 2007 the Directorate for Public Works and Water Management, Redstack, and ENECO signed a declaration of intent for development of a pilot plant on the Afsluitdijk in the Netherlands.[6] The plant was put into service on 26 November 2014 and produces 50 kW of electricity to show the technical feasibility in real-life conditions using fresh IJsselmeer water and salt water from the Wadden Sea. Theoretically, with 1m3/s river water and an equal amount of sea water, approximately 1 MW of renewable electricity can be recovered at this location by upscaling the plant.[7] It is to be expected that after this phase the installation could be further expanded to a final capacity of 200 MW.

The main disadvantage of reverse electrodialysis electricity production is the high capital costs involved. Ion exchange membranes are very expensive and power produced per membrane area is really low. As consequence, return of investment is much lower than other renewable energy sources such as wind or solar.
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The company behind the Harlingen site:
https://www.redstack.nl/
 
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