Hydrogen from seawater: DICP's 250 kW system

A comparative review of seawater-to-hydrogen routes challenges the most repeated assumption in the field: that the gain will come from removing desalination and electrolysing seawater directly.

The Chinese Academy of Sciences reported on 16 September 2026 the 250 kW system from the Dalian Institute of Chemical Physics, published in Nature Energy: waste heat from alkaline electrolysis distils seawater at low temperature, delivering 48 Nm3/h of hydrogen, 31.6 kg/h of fresh water and a 14.4% gain in electrical efficiency over electrolysis with fresh water.

That changes what enters the investment case. Desalination stops being an accessory cost of hydrogen and starts producing a second saleable output. Where renewable resource, energy-intensive industry and water scarcity coincide, the project no longer depends on a single offtaker.

The result is pilot scale and still depends on industrial durability. The criterion is already usable: coastal projects assessed on the combined value of water, heat, oxygen and hydrogen reach a wider financing base than the cost of a kilogram of H2 alone.