Colombia's Rationing Trap: A Hydropower Grid Meets Dwindling Gas

An investment bank in Colombia priced an hour of rolling blackouts at 5.6 billion pesos (about US$1.75 million) ^[1], not as a forecast but as a measure of what the grid loses when it cannot dispatch power. The warning arrived in September 2026 as El Niño strengthened. For decades, Colombia sold neighbors electricity and gas; today it is quietly becoming an energy importer at the worst moment.

The mechanism is simple and perilous: hydropower supplies roughly two-thirds of Colombia's electricity ^[1], so when rain stops, the grid must pivot to natural gas. But proved gas reserves fell 16.8 percent in 2025 alone, to 1,717 gigacubic feet, and have declined 54.6 percent since 2018 ^[9]. At current production rates, domestic reserves cover only 5.9 years ^[9]. The result: Colombia now imports a quarter to a third of the gas it burns ^[9]. When both the rain and the domestic fuel fail in the same season, thermal plants cannot run, and neither can much of the grid.

The cost falls on businesses and residents. Electricity demand jumped almost 9 percent in May 2026, the steepest rise in a year, yet reservoir inflows ran at only three-quarters of the historical average ^[3]. This is a demand-supply collision in real time. Rationing, when it comes, is not a policy choice but the absence of one; it is the bill presented when infrastructure investment and fuel-supply planning fall behind both climate risk and economic growth.

The comparison that matters: countries with diversified grids, wind, solar, storage, or nuclear, do not face this choice. Germany derives less than 5 percent of annual generation from hydropower and rationing is not on the table even in winter. France's fleet is two-thirds nuclear; it sits through droughts without cutting power to households. Brazil, which also leans on hydro, built massive thermal and wind capacity alongside it; when reservoirs dropped in 2021, the grid held. Colombia's bet that rain would be reliable, and that gas would be cheap and plentiful, has matured into a crisis. The government has urged schools and businesses to work remotely during planned gas import-terminal maintenance ^[7], a hint of the fragility to come.

Colombia's Caribbean governors have put cheaper energy at the top of their common agenda ^[5], a regional cry that reflects price shock: when imports spike and grid stress rises, power tariffs climb fastest in the poorest regions. The fix is not rationing management; it is capacity. Solar and wind can be built faster than new gas infrastructure or hydropower dams, cost less per megawatt, and run without fuel imports. The major grid operator, Grupo Energía Bogotá, is preparing a US listing to raise capital ^[4], a sign that finance exists for large projects. What is missing is the institutional speed and the regulatory default that says yes to distributed renewable capacity, rooftop solar, storage, microgrids, at scale. Australia solved this problem by making small-scale solar the path of least resistance: installers were accredited, permitting was same-day, and rebates hit at the point of sale. Colombia has the sun; it does not yet have the rule set to use it.