The Great Drought of 1968: Chile's 'Silent Earthquake' and the Birth of Daylight Saving Time
Between 1967 and 1969, Chile endured one of the worst rainfall deficits of the twentieth century, a catastrophe so severe that President Eduardo Frei Montalva called it 'the silent earthquake.' As reservoirs dried up and hydroelectric power collapsed, the government turned to an unusual remedy on October 31, 1968: decreeing the country's first daylight saving time to conserve electricity.
A Nation Parched
The Great Drought of 1968 struck Chile after two years of abnormally low precipitation across the country's central and southern agricultural heartlands. Rainfall totals plunged to levels not seen since the drought of 1924, making the 1967-1969 crisis one of the most severe rainfall deficits Chile experienced in the entire twentieth century. Rivers that normally swelled with Andean snowmelt and winter rains ran thin, reservoirs shrank dramatically, and irrigation canals that farmers depended on for generations ran dry. The satirical magazine Topaze went so far as to argue that the drought's economic and social toll exceeded that of the 1960 Valdivia earthquake, the most powerful earthquake ever recorded on Earth, a striking comparison given the scale of destruction that seismic event had caused less than a decade earlier. President Frei's own description of the disaster as a 'silent earthquake' captured how a slow-moving natural catastrophe could rival the devastation of a sudden geological one, quietly eroding harvests, livelihoods, and infrastructure across the nation without a single dramatic moment of impact.
Did You Know?
Chile's satirical magazine Topaze argued that the Great Drought of 1968 caused worse effects than the 1960 Valdivia earthquake, the most powerful earthquake ever recorded on Earth, a comparison that reflected just how devastating this slow-moving disaster proved to be.
The Hydropower Crisis
Chile's electricity supply in the late 1960s depended heavily on hydroelectric generation, drawing power from dams and rivers fed by rainfall and mountain snowpack. As the drought deepened through 1968, water levels behind key hydroelectric facilities dropped to critical lows, threatening the reliability of the national power grid. Industries, cities, and households all faced the prospect of severe electricity shortages just as the country's growing economy demanded more consistent power. The crisis exposed the vulnerability of a system with no significant backup generation capacity, leaving officials scrambling for solutions that could reduce demand without shutting down factories or plunging homes into darkness. Water reserves needed for irrigation, drinking supplies, and power generation were all competing for the same dwindling resource, forcing hard choices about which needs would take priority as the drought showed no signs of relenting.
Frei's Decree and Its Legacy
Facing an energy emergency with no quick fix for the underlying drought, President Eduardo Frei Montalva signed a decree on October 31, 1968, establishing daylight saving time in Chile for the first time. By shifting clocks forward, the government aimed to align daylight hours more closely with periods of peak electricity demand, reducing the need for artificial lighting in the evenings and easing pressure on the strained hydroelectric system. The measure represented a pragmatic, low-cost intervention that governments could implement immediately, unlike large infrastructure projects that would take years to complete. Though modest compared to the scale of the drought itself, the decree marked a turning point in Chilean policy, introducing a practice that would become a recurring seasonal adjustment in the decades that followed. The Great Drought of 1968 ultimately underscored the risks of relying so heavily on a single, weather-dependent energy source, prompting longer-term discussions about diversifying Chile's power generation to guard against future climatic shocks.