About 50% of the solar energy absorbed at the Earth’s surface drives evaporation, fueling the water cycle that affects various renewable energy resources, such as wind and hydropower. Recent advances demonstrate our nascent ability to convert evaporation energy into work, yet there is little understanding about the potential of this resource. Here we study the energy available from natural evaporation to predict the potential of this ubiquitous resource. We find that natural evaporation from open water surfaces could provide power densities comparable to current wind and solar technologies while cutting evaporative water losses by nearly half. We estimate up to 325 GW of power is potentially available in the United States. Strikingly, water’s large heat capacity is sufficient to control power output by storing excess energy when demand is low, thus reducing intermittency and improving reliability. Our findings motivate the improvement of materials and devices that convert energy from evaporation.

«За последние годы мы создали технологии, позволившие нам обуздать энергию ветра, солнца и воды, однако не меньше тепла и тока можно получить из энергии, выделяемой при испарении воды в озерах, реках и других водоемах. Мы дали первую оценку тому потенциалу, который заключен в этой энергии», — заявил Озгур Сахин (Ozgur Sahin), биофизик из университета Колумбии в Нью-Йорке (США).