Romanian authorities modified the Danube River this month to prevent a cooling water shortage from shutting down a nuclear power plant reactor.
The intervention was necessary to secure the operation of the Cernavodă nuclear power plant, where low water levels threatened the cooling systems of the facility's second reactor.
Operations began earlier this month to redirect water flow toward the plant. On Monday, Aug. 3, 2026, authorities conducted a rock-blasting operation to remove an outcrop [5]. This effort was combined with the sinking of rock-filled barges to create a barrier in the river. While reports on the number of vessels vary, sources said between two [2] and four [3] barges were sunk.
The intervention site is located about 60 km upstream from the Cernavodă plant [4]. According to reports, these combined efforts resulted in a water level increase of approximately 8 cm near the plant [1]. This marginal increase in depth is intended to stabilize the flow of cooling water and mitigate the risk of an emergency shutdown.
The Cernavodă facility remains a critical piece of Romania's energy infrastructure. Beyond these emergency river works, the plant is undergoing long-term modernization. The European Investment Bank has approved an €800 million loan for the refurbishment of Unit 1 [6].
Government officials and plant managers oversaw the river works to ensure the second reactor could continue operating despite the low water levels in the Danube. The use of both blasting and physical barriers reflects the urgency of maintaining the power supply during the current environmental conditions.
“Romanian authorities modified the Danube River this month to prevent a cooling water shortage”
The reliance on physical river modifications to maintain nuclear cooling highlights the vulnerability of critical energy infrastructure to fluctuating water levels. As climate patterns lead to more frequent droughts in the Danube basin, Romania may face a recurring need for such interventions or be forced to invest in more permanent, closed-loop cooling systems to ensure energy security.
