Ukraine energy profile
Ukraine — a grid under sustained, deliberate attack
55 → 11.5 GW
Generation capacity, pre-war vs. Feb 2026
217+
Reported attacks on energy infrastructure since start of 2026
25+
Times Zaporizhzhia NPP has lost all external power
2.3 GW
European electricity import capacity, winter 2025-26
Europe's largest nuclear plant, under occupation
Zaporizhzhia — four years of precarious safety
This section describes an active, dangerous, and unresolved situation at an occupied nuclear facility. It reflects IAEA and other reporting current to August-September 2026 and will change — check current IAEA statements for anything more recent.
Occupied, but still run by Ukrainian staff:
Russian forces have controlled the Zaporizhzhia Nuclear Power Plant — Europe's largest, with six reactors — since March 2022, though Ukrainian technical staff continue to operate it day to day under Russian military oversight. All six reactors have been in cold shutdown since September 2022. The plant depends on external power lines to keep its reactors and spent fuel safely cooled even while shut down, and those lines run through or near an active conflict zone: according to the OECD Nuclear Energy Agency and IAEA reporting, the plant has completely lost external power more than two dozen times since the invasion began, including 13 separate losses since April 2026 alone, each time falling back on emergency diesel generators with only about ten days of onsite fuel.
Russian forces have controlled the Zaporizhzhia Nuclear Power Plant — Europe's largest, with six reactors — since March 2022, though Ukrainian technical staff continue to operate it day to day under Russian military oversight. All six reactors have been in cold shutdown since September 2022. The plant depends on external power lines to keep its reactors and spent fuel safely cooled even while shut down, and those lines run through or near an active conflict zone: according to the OECD Nuclear Energy Agency and IAEA reporting, the plant has completely lost external power more than two dozen times since the invasion began, including 13 separate losses since April 2026 alone, each time falling back on emergency diesel generators with only about ten days of onsite fuel.
Unprecedented monitoring, and no resolution in sight:
The IAEA has kept a continuous, rotating team of nuclear safety experts stationed at the plant since September 2022 — something the agency's own director general has described as unprecedented in IAEA history — precisely because the situation is judged serious enough to need direct, ongoing international observation. On 18 August 2026, a drone explosion at a bus stop used by plant staff killed one person and injured 19 others; the IAEA called it unacceptable. Beyond the immediate safety risks, the plant's political future is genuinely unresolved: Russia has annexed the surrounding region (not internationally recognised) and treats the plant as its own, while Ukraine regards it as sovereign Ukrainian territory — a disagreement analysts expect to remain unresolved even if a broader ceasefire or peace settlement is eventually reached.
The IAEA has kept a continuous, rotating team of nuclear safety experts stationed at the plant since September 2022 — something the agency's own director general has described as unprecedented in IAEA history — precisely because the situation is judged serious enough to need direct, ongoing international observation. On 18 August 2026, a drone explosion at a bus stop used by plant staff killed one person and injured 19 others; the IAEA called it unacceptable. Beyond the immediate safety risks, the plant's political future is genuinely unresolved: Russia has annexed the surrounding region (not internationally recognised) and treats the plant as its own, while Ukraine regards it as sovereign Ukrainian territory — a disagreement analysts expect to remain unresolved even if a broader ceasefire or peace settlement is eventually reached.
The rest of the grid
Losing 40 GW, and adapting anyway
The scale of the damage:
Ukraine's pre-war generation fleet, at roughly 55 GW, was among the largest in Europe. By 2025 only about 17.5 GW remained operational, and by February 2026 available capacity had fallen further to around 11.5 GW — a loss of over 40 GW across four years of war. Ukraine's Ministry of Energy has emphasised that the loss of "manoeuvrable" thermal and hydro generation — the plants that can quickly ramp output up or down — has been especially damaging, because it leaves the grid unable to respond to demand swings even when total generation capacity looks adequate on paper. The Kakhovka Dam's destruction in June 2023, an event Ukraine and Western governments have attributed to Russia, took out a major hydroelectric facility entirely. Greenpeace International documented 217 separate attacks on energy infrastructure in just the opening weeks of 2026, and reporting from mid-2026 describes a fifth consecutive winter campaign of strikes specifically targeting thermal power plants.
Ukraine's pre-war generation fleet, at roughly 55 GW, was among the largest in Europe. By 2025 only about 17.5 GW remained operational, and by February 2026 available capacity had fallen further to around 11.5 GW — a loss of over 40 GW across four years of war. Ukraine's Ministry of Energy has emphasised that the loss of "manoeuvrable" thermal and hydro generation — the plants that can quickly ramp output up or down — has been especially damaging, because it leaves the grid unable to respond to demand swings even when total generation capacity looks adequate on paper. The Kakhovka Dam's destruction in June 2023, an event Ukraine and Western governments have attributed to Russia, took out a major hydroelectric facility entirely. Greenpeace International documented 217 separate attacks on energy infrastructure in just the opening weeks of 2026, and reporting from mid-2026 describes a fifth consecutive winter campaign of strikes specifically targeting thermal power plants.
Adaptation under fire:
Ukraine has responded with a mix of imports, decentralisation, and continued renewable build-out. European electricity import capacity reached approximately 2.3 GW for the 2025-26 winter, providing a buffer after major strikes, while in milder months Ukraine has continued exporting surplus power when domestic supply comfortably exceeds demand (a record 450,000 MWh in August 2025). The EU's "Repair Rebuild Restart" plan, announced in February 2026, committed over €920 million toward winter 2026-27 resilience, including distributed generation designed to survive partial grid collapse. Private renewable developers have kept building even during the war: DTEK Renewables' Tyligulska wind farm in the Mykolaiv region is described by industry sources as the world's first wind farm constructed during an active war.
Ukraine has responded with a mix of imports, decentralisation, and continued renewable build-out. European electricity import capacity reached approximately 2.3 GW for the 2025-26 winter, providing a buffer after major strikes, while in milder months Ukraine has continued exporting surplus power when domestic supply comfortably exceeds demand (a record 450,000 MWh in August 2025). The EU's "Repair Rebuild Restart" plan, announced in February 2026, committed over €920 million toward winter 2026-27 resilience, including distributed generation designed to survive partial grid collapse. Private renewable developers have kept building even during the war: DTEK Renewables' Tyligulska wind farm in the Mykolaiv region is described by industry sources as the world's first wind farm constructed during an active war.
Questions
Questions about Ukrainian energy
Why is losing external power dangerous for a nuclear plant that isn't even generating electricity?
A nuclear reactor doesn't stop needing active cooling just because it's shut down. Even in "cold shutdown" — the state all six Zaporizhzhia reactors have been in since September 2022 — the reactor cores and the spent fuel stored on site continue producing residual heat from ongoing radioactive decay, and that heat has to be continuously removed by circulating coolant, which requires a steady supply of electricity to run pumps and safety systems. Under normal conditions that power comes from the external grid; when it's cut, the plant switches to onsite emergency diesel generators, which is exactly the backup system it's designed to have and is why repeated outages haven't yet caused a safety failure. The concern IAEA officials have repeatedly raised isn't that any single outage is likely to cause an accident — it's the cumulative risk of relying on backup systems again and again, for years, under wartime conditions where diesel resupply, equipment maintenance, and staff safety are all harder to guarantee than in peacetime. A facility with roughly ten days of onsite diesel fuel is built for occasional, short emergencies, not as a routine, years-long substitute for a stable grid connection — which is precisely why this pattern, more than any single incident, is what nuclear safety experts consider the core long-term risk at Zaporizhzhia. Source: OECD Nuclear Energy Agency · IAEA reporting via BASE (Germany) and Al Jazeera.
Provenance
Attribution and citation
- Sources
- OECD Nuclear Energy Agency · IAEA reporting (via BASE, Germany, and Al Jazeera) · Greenpeace International · International Energy Agency "Ukraine's Energy Security" · The Ukrainian Review · SCM Global · TechTimes
- Cite as
- "Ukraine Energy Profile — Complete Reference", The Energy Codex, https://thecodex.expert/energy/countries/ukraine/, last updated .