Teréga’s proactive action against atmospheric emissions

Teréga’s proactive action against atmospheric emissions

Since 2017 we have committed ourselves to further consolidation of our actions to reduce atmospheric discharges. That process applies in particular to emissions of greenhouse gases (GHGs), which have already decreased markedly since the early 2010s, through a dedicated programme. With effective and regular results, we have focussed our action on three main objectives: the reduction of gas emissions during maintenance work, the detection and reduction of diffuse losses, and the development and optimisation of processes contributing to a drop in GHG discharges.

At Teréga, to act on GHG emissions you must first recognise them

The reduction of our atmospheric discharges, and particularly GHGs, is an integral part of our energy and environmental management systems, so our approach is based on an accurate, real and transparent assessment of the current situation driven by our BE POSITIF program.

Logo Be Positif

The atmospheric emissions associated with Teréga’s activities are chiefly of two

  • greenhouse gases (mainly carbon dioxide-CO2 and methane-CH4),

  • atmospheric pollutants from the burning of gas (sulphur dioxide-SOx, 
    nitrogen oxides-NOx and volatile organic compounds excluding

According to readings taken by approved external organisations, emissions of atmospheric pollutants (NOx, SOx etc.) arising from the burning of gas account for a very small amount.

As for GHGs, we have developed accurate tracking, illustrated by our Carbon Audit. One of its challenges is to allow us to “meter well” so that we can act better and set accurate, quantifiable targets. That Carbon Audit enables us to perform monitoring of our indicators in accordance with the ISO 14001 and 50001 standards, to measure the impact of our improvement actions and to meet our regulatory requirements. Our approach has enabled us to shine a light on our main emissions: combustion, diffuse losses and venting. And thus our priority areas for action in terms of reducing emissions.

What is carbon neutrality?

It implies a balance between carbon emissions and the absorption of carbon from the atmosphere in carbon sinks. To achieve net zero emissions, all GHG emissions worldwide should be compensated by carbon sequestration. A carbon sink is defined as any system absorbing more carbon than it emits. The main natural carbon sinks are the ground, forests and oceans. It is estimated they can eliminate between 9.5 and 11 gigatonnes (GT) CO2 per year.

Ambitious targets for reducing GHG emissions

We are committed to helping reach carbon neutrality by 2050, in line with targets set in the
Paris 2015 agreement and the National Low Carbon Strategy.
We expect to reach our first milestone in 2025, reducing our methane emissions by 36%
from 2017 levels, in line with the commitments we made under the Oil & Gas Methane
A second significant target should be reached by 2030, with the reduction of our emissions
under scopes 1, 2 and 3* by 30% from 2021 to 2030. For scopes 1 and 2, we set ourselves
the target of a 45% reduction in our emissions, continuing the downward trajectory on which
we embarked in 2017. By including scope 3 in that trajectory, we can now also take into
account and limit the indirect emissions associated with Teréga’s activities.

*scope 1: direct emissions
- scope 2: indirect emissions linked to energy
- scope 3: other indirect emissions - usage of the gas downstream is not included, with
Teréga offering just a transport and storage service

-32 %

GHG emissions of gas between 2017 and 2022 (scope 1 & 2)

-21 %

Methane emissions from 2017 to 2022


tCO2eq (Carbon audit scopes 1 and 2)


tCO2eq (Carbon audit scope 3)

2018-2022, GHG emissions evolution

Teréga's environmental performance

At Teréga, taking action on GHG emissions means reinventing yourself

Our top priority actions are aimed at our main source of impact: greenhouse gas (GHG) emissions. The Group has an ambitious plan in place to meet its reduction commitments, adapting its facilities and the way they are run, involving all its workers, and suppliers too for indirect emissions. Our actions illustrate our ability to mobilise, to innovate in how we practise our activities, and yet still uphold the same level of service.

To combat the atmospheric emissions associated with our activities, we have implemented several initiatives:

  • Optimisation of our compression resources

The compression equipment we use has evolved with a move to electric compressors which do not use gas and release less gas.

We have also developed a digital solution to limit emissions across our compression equipment. The OPTIMUS software has allowed real-time optimisation of our machinery, including the CO2 factor in technical solution optimisation.

  • Reducing emissions associated with decompression across transport infrastructures

We have studied a number of venting solutions. In 2022, we commissioned our RECOMP recompression systems at our compression stations at Barbaira, Lussagnet and Sauveterre, and also our storage centre at Lussagnet. This device collects the gas from main compressor pipework and reinjects it into the grid, releasing none of it into the atmosphere.
As for work on our transport grid, in 2020 we launched a special solution: MOBILE COMP, an articulated lorry fitted with a mobile compressor.

At present, during transport maintenance works, several tens of tonnes of CO2 are recovered every year through recompression.

When recompression is impossible, the flare principle allows the methane to be burned, reducing its overall global warming potency from 34 to… 1 (the same level as CO2).

  • Diffuse loss reduction

The diffuse losses generated at plants under normal operation are a priority challenge for reducing emissions. Preventive actions have already allowed some reductions. In 2022, we installed different technologies to compressors in our existing estate, to prevent leaks from their seals. Those solutions will be compared in 2023 so that they can be rolled out at a later date to the rest of our compressors. Adaptation of operating practices to the new flow management has amplified the benefits of these technologies.

  • Methanation: why not recycle CO2?

As part of our proactive approach, we are also preparing solutions for tomorrow’s world. This means we are involved in a number of research projects looking at methanation. This process allows synthetic methane to be produced from hydrogen and CO2. The development of this sector, supported by Teréga, will allow the injection of synthetic methane into our grid, at the same time reducing CO2 emissions, as they will be recycled and re-used.

  • Dialogue with suppliers and development of a new methodology for
    calculating indirect emissions (scope 3):

In 2022, along with about ten other pilot suppliers, we started on a process to study our indirect emissions (scope 3). That work enabled us to start work to quantify those emissions using methodology that takes activity-based as well as monetary factors into account as much as possible. We were also able to set targets for reductions by 2030. In 2023, we are continuing the dialogue with our suppliers so that together we can define a low-carbon trajectory and common focus areas for reductions.

For Teréga, carbon neutrality will also be achieved through mobility

To reduce polluting emissions due to road traffic, Teréga has drawn up a Mobility Plan, submitted to Pau Béarn Mobilité, which defines a set of measures to optimise the efficiency of employee travel. Therefore, since 2018, we have embarked on the progressive renewal of our fleet of vehicles: around fifty vehicles, depending on the network and our operational needs, have been switched over to NGV (Natural Gas for Vehicles). On some of our sites we have built our own private NGV filling stations.

The carbon audit: what is it?

Discover our educational booklet reZolutions dedicated to the subject to deepen your knowledge of the challenges of the carbon footprint in the gas sector.

reZolutions Bilan Carbone