Hydrogen backers make three miscalculations about the gas’ key input, water: that they won’t need much, that it’s cheap, and that desalination is a breeze. Water scarcity means many projects will be left high and dry, says AntonyMCurrie
confirmed to Breakingviews they are considering using treated seawater in their plants in Western Australia, without disclosing how much they will need. Another option is using wastewater. BP is mulling that for another of its projects Down Under. Yarra Valley Water will tap its treatment plant for its new operation.Miscalculating water needs will, at worst, leave green hydrogen projects high and dry. For others, it will impact the estimated cost of production.
If such assumptions are based on needing nine litres of water per kg, there’s a shock coming. Bump it up to 300 litres — the midpoint of GHD’s range for seawater needed — and that’s as much as 60 cents per kg for desalination alone, Breakingviews calculates using data cited byresearchers. Trouble is, much of this is educated guesswork: prospective producers contacted by Breakingviews would not provide any numbers.
It wouldn’t be the first time that big companies suffer from water blindness. It caused delays to Tesla’s
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