These revisions represent the equivalent of more than 7 additional cumulative non-operating months in 2018 for an equivalent of a second generation unit (ca.1GW), with no impact on 2019. The impact of these revisions is a shortfall of around 250 million euros at group EBITDA and net recurring income group share. ENGIE has immediately decided to put in place a specific action plan to reduce the effects of this new revision agenda on the 2018 financial performance. Moreover, taking into account the good commercial dynamics of the group activities and the good performance of the gas midstream and renewable hydroelectric power generation activities in France, the Group is confident in its ability to significantly offset the impact of the nuclear unavailability. At the latest, at first half financial results publication on July 27, the Group will be able to clarify and comment in more detail the financial impact resulting from these measures. Annex : Electrabel communication of June 15, 2018 Adjustment of the revision program of the nuclear units After consulting the Belgian Federal Agency for Nuclear Control (FANC), Electrabel decided to modify the agenda of the planned revisions of Tihange 2 and Doel 4 and to adjust the end date of the ongoing Tihange 3 revision. With this adjustment, Electrabel aims to inspect the concrete ceilings of the building adjacent to the reactor building for each unit. This particular building contains the 2nd level security systems, which are only used if there is a problem with the 1st level systems. Analyses have shown that in these installations, located in the non-nuclear part of the plant, the state of the concrete could be weakened as a result of the hot and humid conditions. Since the safety requirements foresee that the bunker buildings need to withstand an external event, the operator of the plant must be able to demonstrate that this resistance is insured at all times. As a reminder, during inspections in the planned shutdown of the Doel 3 reactor, the Electrabel teams noticed that the concrete needed to be repaired. The necessary actions to fix this are being taken and the restart is scheduled on August 1, 2018. At Tihange 3, the scheduled revision is in progress. In April 2018, Electrabel also noted a deterioration of the concrete of the ceilings of the premises housing the outlet nozzles of the vapor exhaust valves. Based on the analyses made since then, it appears that the unavailability of Tihange 3 should be extended till September 30.   Taking into account the return on experience on Doel 3 and Tihange 3, Electrabel decided today to adjust the revisions program for its nuclear park :

• In order to anticipate a possible extension of the duration of the work activities
• In order to anticipate the scheduled shutdown dates and allow inspection of other units.

  In practical terms, the timing of the scheduled revisions of the Belgian nuclear park will be as follows:

• Tihange 1: Revision scheduled from October 20 to November 29, 2018
• Tihange 2: Revision scheduled from August 19 to October 31, 2018
• Tihange 3: Ongoing revision scheduled until September 30, 2018
• Doel 1 - Doel 2: Long-term revision scheduled as part of the life extension program of the units until 1 October and 8 October respectively
• Doel 3:Planned revision and concrete works on the bunker building scheduled until August 1, 2018
• Doel 4:Planned revision scheduled from August 6 to December 15, 2018

The calendar above aims at having the maximum available capacity during the winter, while keeping nuclear safety as a top priority for our 2,000 employees working on our sites. However, these dates are set based on the information known today and could be adjusted depending on the results of the inspections and the work progress. Electrabel will communicate transparently to the markets. Electrabel recalls that these events have no impact on the population, the employees or the environment.