Since 2006, Teréga has been committed to reducing its GHG emissions and improving energy efficiency at its installations. Following the first effective results, Teréga new targets are as follows:
- to reduce emissions of natural gas released to clear stretches of pipeline prior to maintenance work;
- Detect and reduce diffuse emissions;
- Working on optimising procedures in order to reduce its energy consumption and, consequently, greenhouse gas emissions.
The principle sources of GHG emissions have been identified. In order of importance, they are:
- The combustion of natural gas when used as a fuel for certain machines, generally the motors driving the compressors needed to circulate the gas through the pipelines. In order to reduce these emissions, Teréga is developing the use of electric compressors at the Sauveterre-de-Guyenne, Lias, Montauban Lussagnet and Barbaira (in near future) compression stations;
- Diffuse losses through micro-leaks at our installations: resorption actions are now well-integrated into the Teréga maintenance system. They have enabled us to reduce these uncontrolled emissions by more than 35% since 2006.
- Venting: these voluntary emissions of methane into the atmosphere occur when compressors are shut down or when part of the pipework is emptied for maintenance works on the network. They represent around 30% of Teréga's emissions.
- Emissions from the light vehicles and heavy equipment of Teréga and its sub-contractors
- Flaring of excess gas resulting from the dehydration process at the Lussagnet storage facility.
- Losses resulting from incidents such as the opening of relief valves, valve malfunction, etc.