The dominant path to green hydrogen is splitting ultrapure water using renewable electrical power in an electrolyser. For each kilogramme of green hydrogen produced, 9-10 litres of water are consumed by electrolysis.
This equates to circa 200 litres of water per megawatt of electrolyser capacity. To generate that amount of ultrapure water, circa 1.5 times as much fresh water is required. And to generate desalinated fresh water, approximately twice as much seawater is required. So, for each litre of ultrapure water, three litres of seawater must be processed.
There are many steps between seawater and ultrapure water. If any of those fail, the electrolyser stack could be damaged beyond repair. If the water processing plant fails, the electrolyser must shut down, resulting in failure to supply offtakers, or causing problems with downstream ammonia synthesis. Reliability and consistent ultrapure water quality are key.
Proven desalination and purificationtechnologies
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