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HighVI Energy Politics & Supply Security4 November 2026, Wednesday

Russian strikes force Ukraine's nuclear plants to cut output

Ukraine's Energy Ministry said on 4 November that nuclear power plants had been forced to reduce output after the 3 November attack. Kyiv's water network was down for more than 24 hours because of power cuts.

Location: KYIV

According to Ukrinform, reporting at 13:12 on 4 November, the ministry said a return to full capacity would be gradual as damaged grids are repaired. One of the targets was a high-voltage substation critical to the stable operation of the Khmelnytskyi nuclear plant. The ministry reported scheduled hourly outages in most regions on 4 November and emergency outages in Kyiv, Kyiv region and Kharkiv. The size of the output cut in megawatts was not disclosed and could not be verified.

According to the Kyiv Independent, the 3 November attack was the largest on energy infrastructure this year. The city water utility, Kyivvodokanal, said the city's water supply was effectively cut off entirely when its pumps lost power. Residents went without water for more than 24 hours; earlier outages had lasted a few hours. The system stabilised on the afternoon of 4 November, and pressure took several more hours to return to normal.

Yatsuk, director of the Institute of Water Problems and Land Reclamation, said this was the most serious water outage in Kyiv since the start of the war. Kharchenko of the Energy Industry Research Centre recalled that January's strikes had crippled output at Kyiv's 3 combined heat and power plants. The sources did not give the number of missiles and drones used in the attack.

Talay assessment

Bottom line

The attack curbed nuclear output without hitting the plants themselves, by striking grid nodes such as the substation serving Khmelnytskyi. When grid connections weaken, output falls; in Kyiv, where 3 combined heat and power plants were crippled in January, this deepens Ukraine's reliance on imports and scheduled outages ahead of winter. Talay's reading is that pressure on energy infrastructure will persist until the 10–11 November talks in Abu Dhabi.

Likely effects

  • Ukraine power supplyNegativeWeeks

    While nuclear capacity cannot be fully used, outage schedules lengthen and industrial output is curtailed.

  • Municipal servicesNegative1–6 months

    Electric water pumps are running between generators and repairs, raising the risk of water outages over the winter.

  • European power tradeUncertainWeeks

    Ukraine's demand for imports from neighbouring EU grids may rise; the sources did not give the volume.

Possibilities, ranked

  1. 1
    Gradual repair, new waves55%

    Nuclear output partly recovers within weeks, but fresh waves of strikes keep outage schedules in force through the winter.

    Watch: Ukrenergo's daily count of outage groups

  2. 2
    Rapid recovery25%

    Substations are repaired, nuclear plants return to full capacity and scheduled outages ease.

    Watch: An Energy Ministry announcement of full capacity

  3. 3
    Nuclear safety crisis20%

    New strikes on substations cut the plants' off-site power and the IAEA issues a warning.

    Watch: IAEA notices on off-site power at Khmelnytskyi and Rivne

Probabilities are calibrated judgement based on the sources, not measurement, and are revised as new information arrives. Not investment advice.

Market reaction

Indicators affected

  • Kyiv without water▼ 24+ hours
  • Emergency outage regions▼ 3

Sources

  1. Ukrinform — Nuclear power plants forced to reduce output after Russian attacks – Energy Ministry
  2. Kyiv Independent — Russian strikes cause Kyiv's worst water outage of full-scale war
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