Low Danube Cuts Iron Gate 1 to a Third of Its Power
A record-low Danube water level has slashed output at Serbia's largest hydro plant to roughly a third of its average daily capacity, but power utility EPS says there will be no shortages.
- Output at the Iron Gate 1 (Djerdap 1) hydro plant has dropped to about one third of its average daily capacity because of the low Danube water level.
- EPS director Dusan Zivkovic says electricity supply will remain stable and there will be no shortages.
- Iron Gate 1 is Serbia's largest power plant, with installed capacity above 1,000 megawatts.
- The low water level is also straining Danube river transport in the middle of the summer heat.
Output at Iron Gate 1, the largest hydroelectric plant in Serbia’s power system, has fallen to about one third of its average daily capacity as the Danube runs low. The plant has installed capacity above 1,000 megawatts and, in normal hydrological conditions, carries the bulk of the country’s renewable generation. Less water through the turbines means proportionally fewer kilowatt-hours, and a drop to a third of capacity at the peak of the season, when demand climbs on air conditioning, is a serious load on the balance sheet.
Serbia’s state utility EPS says there is no cause for concern. Director Dusan Zivkovic said that electricity supply will stay stable and that consumers will not feel the effect of the reduced output on the Danube. The message is aimed at calming the public ahead of the height of summer, when every day of extreme heat lifts peak demand and narrows the operator’s room to maneuver.
Why the drop at Iron Gate hits harder than it looks
Iron Gate 1 is not only the largest plant by installed capacity, it is also a pillar of the system’s flexibility. Hydro units start and stop far faster than thermal blocks, so they are used to cover sudden jumps in demand. When the Danube runs dry, that cheap and fast source shrinks, and the gap has to be filled by more expensive generation: domestic coal-fired blocks or imports from the regional exchange, where prices during summer heatwaves are typically higher.
The effect does not stop at the plant. The low water level also hampers river transport, because barges must reduce their loads to pass through the navigable channel, which raises the cost of moving bulk cargo and coal at exactly the moment when coal is most in demand. The drought therefore hits two channels at once: it cuts clean power output and it makes the fuel logistics for dirtier generation more expensive.
How long can the system withstand a prolonged drought?
The key question is not today’s balance but its duration. If the low water level holds for weeks, the pressure on imports and the thermal sector accumulates, while summer maintenance on thermal blocks further reduces available capacity. In previous years EPS has seen hydrology swing the whole year’s result in both directions: heavy rainfall fills the reservoirs and lowers costs, while droughts drain reserves and push the company onto the market at the worst possible moment.
For now the company’s message is that the system is stable and that reserves are in place. What remains to be watched are the concrete numbers in the coming weeks: Iron Gate’s daily output, the volume of imports, and peak demand during heatwaves. The director’s reassuring statement is worth exactly as much as the supply data will confirm.
Do you think Serbia’s power system enters summer prepared enough for a prolonged drought on the Danube?
