05 Progress report

In our 2024 annual report, we wrote that we expect that, through our investments in new energy infrastructure, grid users can cut 16.4 Mt of carbon emissions by 2030. Gasunie makes this calculation annually. We are currently standing by this forecast, though some of our construction project schedules are facing potential delays due to objection procedures, slow permitting processes, nitrogen regulations, and an overheated contractor market.

Gasunie aims to have cut its methane emissions (part of Scope 1) to 70 kt CO₂e by 2030. In the first half of 2025, methane emissions amounted to 52.4 kt CO₂e compared to 61.8 kt CO₂e in the same period a year earlier. This means that we are still on track to achieve this reduction target.

Furthermore, we aim to have reduced our Scope 1 and 2 emissions (market-based) by 34% in 2030 compared to 2020, assuming the same transmission volumes at subsidiaries GTS and GUD, applying the following formula: CO₂e [kt] = 70 kt CO₂e in methane emissions + (0.137 × transmission volume [TWh]). In the first half of 2025, our Scope 1 and 2 emissions (market-based) amounted to 184.2 kt CO₂e compared to 180.9 kt CO₂e in the same period a year earlier. Transmitted volumes in the first half of 2025 amounted to 489 TWh, compared to 449 TWh in the first half of 2024.

The greatest contribution to a circular world we can make is by taking a different approach to steel. Gasunie operates a network comprising over 17,500 km of steel pipeline and procures a significant amount of steel each year. Of the total weight of steel that Gasunie procured in the first half of 2025, 17.8% was made from recycled materials; this was 13.2% over the whole of 2024.

We report our performance in the area of security of supply in two ways: by the number of transmission interruptions and by the number of uncontrolled events.

In the Netherlands, we understand transmission interruptions to mean the number of times gas transmission was interrupted because no or insufficient gas was able to flow through our infrastructure due to a cause attributable to Gasunie. It is considered a transmission interruption if the connected party has not been informed of an interruption at least three business days in advance or in the event of a gas receiving station (GRS) failure during a standby situation. In Germany, the term is understood to mean the number of times that our infrastructure was unable to supply sufficient gas to customers. The scores attained by Gasunie in the Netherlands and Germany are added together to produce the total score. The standard we have set ourselves is that the number of transmission interruptions in any one year can never exceed six. In the first half of 2025, there was one transmission interruption (2024: 1), which occurred during the decommissioning of the Mill metering and regulating station. An incorrect valve set-up was used by mistake, resulting in a temporary interruption of the gas supply to a GRS in Landhorst. Immediately on detection of the transmission interruption we contacted the regional TSO, who then took appropriate action on behalf of its customers.

Uncontrolled events are incidents involving gas leaks (of natural gas, green gas, hydrogen, nitrogen, air) of over 14,000m³ from a Gasunie-operated pressure holder with a rated pressure of 8 bar or higher. We accept a maximum of two uncontrolled events annually. There were two uncontrolled events in the first half of 2025, which technical examination revealed to be leaks resulting from external corrosion. The corrosion occurred due to a disruption in the cathodic protection system; this disruption was caused by stray currents from the nearby railway line. These currents were transferred to the pipelines through the earth sheath of a crossing 10kV power cable, which led to accelerated corrosion. Measures have been taken in response to these incidents to prevent a recurrence.

We monitor the number of incidents at Gasunie based on our Total Reportable Frequency Index (TRFI), the total number of incidents resulting in lost-time injuries, medical treatment, alternative work, or fatalities per 1 million hours worked. The TRFI at the end of June 2025 was 2.9; on 31 December 2024 this was 2.6*. During the first half of 2025, no accidents resulting in long-term sickness absence** occurred. Our target in 2025 was a TRFI below (and in any case no higher than) 2.5. Accordingly, the TRFI is still above the threshold value, meaning that the number of workplace accidents is unacceptably high. The continued high level of recordable accidents is an additional incentive for us to take further action.

We use two instruments to measure the wellbeing of our employees: employee net promoter score (eNPS, to measure employee satisfaction) and sickness absence rate.

Every year we conduct an employee satisfaction survey. We reported the results of the most recent survey from December 2024 in our 2024 annual report.

Our eNPS score was 26 (benchmark: 18), indicating that our employees would generally recommend Gasunie to others as a company to work for.

Gasunie’s sickness absence rate over the first half of 2025 was 4.1% in the Netherlands and 4.0% in Germany. Our Gasunie-wide target for 2025 is a sickness absence rate that does not exceed 4.0%. Gasunie’s sickness absence rate is lower than the average sickness absence rate for employees working in the Netherlands.

On 30 June 2025, Gasunie had a workforce amounting to 3,242 FTEs, with 2,875 FTEs for Gasunie Netherlands and 367 FTEs for Gasunie Germany. Our workforce has been increasing from the number at the end of 2024, primarily due to our activities related to the energy transition.