Desalination Costs Climb as Water-Stressed Cities Bid Against Each Other

LONDON — The cost of desalinated water ticked to a fresh seasonal high on the Cerulean Exchange this week, as buyers from a dozen water-stressed megacities bid for the same constrained supply, exchange data showed. The move is modest so far — a few percent — but its direction worries analysts because desalination is the marginal source that sets the floor for scarce regions. "When it costs more to make water, it costs more to grow food, cool a data hall, run a hospital," said commodities strategist Marisol Ferreira, who tracks the water complex. The Tethys Hydrous Group, a leading utility on the exchange, attributes the pressure to energy input costs and to demand from highland catchments that used to rely on rain. With registered climate migrants approaching 116 million and corridors widening, relief planners watch the water tape as closely as any hydrologist. On the Cerulean Exchange, a number is climbing. Downstream, so is a bill.