Geological phenomena have a strong visual presence in the landscape of the Chilean Andes. Volcanoes, thermal springs, earthquakes and geysers arise from an active geology. From the start of the 20th century, engineers and geologists have imagined transforming the heat of groundwater reservoirs into electricity. However, its use as electric power at a national scale remains an unfinished promise. Inspired by the anthropology of energy and infrastructures, Martín Fonck delves into the promises of geothermal energy and their abandonment in the Chilean Andes.