GRI 305-1, GRI 305-2, GRI Sector disclosure EU12
In addition to electricity consumption, travel and our vehicle fleet, which is crucial for the quick access to our facilities, have an impact on our carbon footprint. In 2023, emissions from mobility amounted to 2,035 tonnes of CO2 (previous year: 1,743 tonnes of CO2). As part of the ‘ActNow’ sustainability initiative, 50Hertz has set itself the goal of an emission-free vehicle fleet by 2030. To this end, the existing fleet was analysed and a roadmap for vehicle replacement was developed and accompanying measures, such as the creation of the necessary charging infrastructure at the administrative locations, were adopted. In 2023, all CO2 emissions from business air travel were offset for the fifth time.
Sulphur hexafluoride (SF6) is used as an insulation and switching gas in gas-insulated high-voltage switchgear. It has great electrical properties, is non-toxic and is also very chemically stable. However, the global warming potential of SF6 is 23,500 times higher than CO2. SF6 is therefore used in closed circuits in switchgear, meaning emissions are very limited. The pressure vessels are monitored on a regular basis to check for potential leaks. Despite this, however, some leaks can’t be avoided, since they can be caused by the seal technology and (necessary) handling of the gas. In line with a voluntary commitment developed by SF6 producers and users, the loss rate measured against the total stock of SF6 may only be 0.6% in Germany; at 50Hertz, this rate was significantly lower at 0.07% in 2023. 50Hertz handles this gas with great care and responsibility during its transport, storage and use, and is exploring alternative gases to use across its assets. The market currently offers no alternative to SF6 for switchgear at 220 kV and 380 kV levels. 50Hertz, along with other companies, is sponsoring a research project at ETH Zurich. The aim of this project is to systematically investigate the suitability of alternative gases which can replace SF6 as insulating and switching gases in switchgear. The research programme will run for several years. In 2021, a 123 kV switchgear with an alternative gas mixture was commissioned for the first time in the Charlottenburg substation. This reduces the greenhouse effect by 99% compared with equivalent substations that use SF6. In addition, recycled SF6 was placed on an equal footing with brand new SF6 and 50Hertz has decided to use it in the future. In this way, the organisation is making an important contribution to reducing the amount of SF6 which is produced. As part of the Group’s sustainability programme ActNow, the search for a replacement for SF6 is being continued.
Power losses are an inevitable and inherent part of electricity transmission. They occur as current heat losses in conductors, transformers and other system elements, as well as in the form of leaks and corona losses. In 2023, 50Hertz recorded grid losses amounting to 2.5 TWh. 50Hertz planned the first 525 kV extra-high-voltage direct current (HVDC) transmission line in its control area as part of the SuedOstLink between Saxony-Anhalt and Bavaria. This technology is more suitable than conventional three-phase alternating current technology for transmitting large quantities of electricity in a targeted manner and with optimal control over long distances.
50Hertz is committed to the principle that CO2 emissions should be avoided and reduced. Offsetting should only be undertaken if avoidance or reduction is impossible.