The miners of Lota worked in tunnels that ran out under the ocean floor, hewing coal from seams that extended far beyond the shoreline into the dark beneath the Pacific. To reach that coal, the Compañía Explotadora de Lota y Coronel needed power, and in 1897 it found it in falling water. Fourteen kilometers south of Lota, on the Chivilingo River, two turbines began to spin, and a current was born that traveled ten kilometers along a high-tension line to feed the machinery of the undersea mine. It was the first hydroelectric plant in Chile and the second anywhere in South America. The waterfalls of a modest Chilean river had been harnessed to light the way under the sea.
The story began in 1893, not with a vision of national electrification but with a hard industrial problem. The Lota coal mine ran tunnels far out beneath the seabed, and the deeper and farther the workings went, the more they demanded - drainage, ventilation, haulage, all of it hungry for energy that muscle and steam could no longer cheaply supply. The company commissioned feasibility studies, and its chief engineer, William E. Raby, drew up the plans. His decision was forward-looking for its moment: he settled on alternating current to drive three-phase motors, a choice that put a remote Chilean coal operation at the leading edge of the worldwide argument over how electricity should be made and moved.
Construction began in 1896, and it was a genuinely international effort. The mining company itself built the civil works and the aqueduct that channeled the river. The precision machinery came from abroad - hydraulic and electrical engineering supplied by the Consolidated Company of North America and by Schuckert and Company of Nürnberg, Germany. At the heart of the plant sat two Pelton turbines, the elegant water wheels that capture the energy of a high-pressure jet, each driving an alternator rated at 215 kilowatts. The output, 400 volts at fifty cycles, was stepped up and sent racing along a ten-kilovolt line roughly ten kilometers to the mine. For 1897, on the far side of the world from Europe's industrial heartland, this was strikingly modern engineering.
What makes Chivilingo remarkable is not its scale - by any later measure it was tiny - but its place in time. When those turbines first turned, hydroelectric power was barely more than a decade old anywhere. Niagara had only just been harnessed. That a coal company in the Biobío Region of Chile built the continent's second hydroelectric station, and chose alternating current to do it, speaks to how quickly the new technology spread along the arteries of global industry. The plant has since been recognized as an IEEE Milestone in electrical engineering, the same honor given to landmark sites in the history of electricity around the world. A small dam on the Chivilingo River sits, improbably, among them.
Chivilingo generated electricity for the better part of a century, from 1897 until 1975, ending its working life folded into Chile's Central Interconnected System - the national grid it had, in a sense, helped to begin. When it finally shut down, it was nearly eighty years old, an antique still turning. Rather than let it be scrapped, the city of Lota transferred the plant in 1998 to the Fundación Chile, which now keeps it open to visitors. You can walk among the old machinery and the aqueduct, in the green river valley south of Lota, and stand where South America's electric age took one of its very first breaths - built not for cities or comfort, but to power the tunnels beneath the sea.
The Chivilingo Hydroelectric Plant lies about 14 kilometers south of Lota, in a river valley near 37.14°S, 73.14°W, just inland from Chile's Biobío coast. From the air the site is a small clearing in green coastal hill country, with the Chivilingo River threading toward the Pacific to the west and the former coal towns of Lota and Coronel strung along the shoreline to the north. A viewing altitude of 2,500-4,000 feet frames the valley, the coastline, and the old undersea-mine district together. Coastal weather is changeable, with low cloud and onshore wind common. The nearest major airport is Carriel Sur (ICAO: SCIE) at Concepción, roughly 25 nautical miles to the north.