Farmers in hot, arid regions are turning to low-cost solar pumps to irrigate their fields, eliminating the need for expensive fossil fuels and boosting crop production. But by allowing them to pump throughout the day, the new technology is drying up aquifers around the globe.

Solar pumps are spreading rapidly among rural communities in many water-starved regions across India, Africa, and elsewhere. These devices can tap underground water all day long at no charge, without government scrutiny.

For now, they can be great news for farmers, with the potential to transform agriculture and improve food security. The pumps can supply water throughout the daylight hours, extending their croplands into deserts, ending their reliance on unpredictable rains, and sometimes replacing existing costly-to-operate diesel or grid-powered pumps.

But this solar-powered hydrological revolution is emptying already-stressed underground water reserves—also known as groundwaters or aquifers. The very success of solar pumps is “threatening the viability of many aquifers already at risk of running dry,” Soumya Balasubramanya, an economist at the World Bank with extensive experience of water policy, warned in January.

An innovation that initially looked capable of reducing fossil-fuel consumption while also helping farmers prosper is rapidly turning into an environmental time bomb.

  • @VirtualOdour@sh.itjust.works
    -1•2 months ago

    The places which actually have water problems have all built big desalination projects which are working incredibly well, they’re solar powered too which is nice. Isreal has even been refilling the Sea of Galilee (which is a freshwater lake btw)

    The US could do similar and so could everywhere else, the reality is current use isn’t really a huge problem - no one is going without and it’s not really damaging anything. The cost of infrastructure is falling rapidly and improving dramatically so we’re going to see these systems built but transition from fossil fuels is more important though they do go hand in hand as modern designs are engineered to work with excess load

    The principle is simple you have it placed near big solar and wind developments and at peek generation you use that to desalt water and pump it into a lifted tank which gives it the pressure needed to pump it through pipes to an upriver lake for storage and use. This allows the solar to output a steady feed into the main power grid without wasting the over capacity,