Operational performance

Please find the EDF group’s main operational KPIs, linked to electricity output, volumes distributed and customer data. This information allows to understand the Group’s activity and his overall performance.

162.0TWh

Nuclear output at end-May 2026 – France
14.1TWh

Nuclear output at end-May 2026 - UK
20.7TWh

Hydro output at end-May 2026 – France
41.1 millions

Group customers in 2025
96.9TWh

volumes distributed by Enedis in Q1 2026

Nuclear output

Nuclear output is a key indicator of the operational performance of EDF. This section presents the output data in France and in the UK, to follow the evolution of the nuclear fleet and its contribution to the group generation mix.

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Nuclear output in May 2026 amounted to 28.8TWh, up by 3.2TWh vs May 2025.

Since the beginning of the year, cumulative annual output was 162.0TWh, up by 6.4TWh compared to 2025. This is due to the roll-out of the 2026 outages, as planned and to the good availability of the reactors in operation.

Evolution of cumulative nuclear output in France in May 2026 (description bellow)

	May 2025	May 2026	Change
Output of the month	25.5TWh	28.8TWh	12.9%
Cumulative output	155.6TWh	162.0TWh	4.1%

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Nuclear output in May 2026 was 2.4TWh, 0.7TWh down from May 2025.

Cumulative output was 14.1TWh, down by 0.6TWh vs prior year, due to higher number of unplanned outages in 2026.

Evolution of cumulative nuclear output in the United Kingdom in May 2026 (description bellow)

	May 2025	May 2026	Change
Output of the month	3.1TWh	2.4TWh	-23.1%
Cumulative output	147TWh	14.1TWh	-3.9%

Hydro output

Hydro output, by being a renewable, manageable and flexible energy, contributes to the EDF’s energy mix balance. This section presents the output data in France, with a distinction between monthly and cumulative data, to track trends in the hydro activity.

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Evolution of cumulative hydro output in France in May 2026 (description bellow)

	May 2025	May 2026	Evolution
Output of the month¹	3.8TWh	4.1TWh	7.5%
Cumulative output²	20.3TWh	20.7TWh	1.9%

(1) Hydropower excluding electrical activities on French islands, before deduction of pumping consumption

(2) Cumulative production after deduction of pumping consumption: 16.8TWh in 2025 and 16.7TWh in 2026

Distribution data

This section presents key indicator for electricity distribution and allows to follow the volumes distributed by Enedis.

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Group customers

This section presents key indicator on the Group’s customers. It allows to follow the track changes in the group’s total number of customers over a three-year period.

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