- Project plans
- Project activities
- Legislation and standards
- Industry context
- Specialist wikis
Last edited 20 Dec 2022
Europe moves to phase out electrical sulphur hexafluoride (SF6) gas
Sulphur hexafluoride (SF6) gas is colourless, odourless, non-toxic and five times denser than air. It’s also the world’s most potent greenhouse gas, with a global warming potential 23,500 times more than CO2. With that sort of climate change impact, one might wonder why it’s relevant to the future of an increasingly de-carbonized electrical industry. However, the electrical industry still relies on its excellent electrical insulation properties to prevent short circuits in medium- and high-voltage installations that would otherwise lead to damage, disruption, fire or explosion.
Sulphur hexafluoride is just one of a now infamous family of ‘F-gases’. The EU has banned the use of many of these gases and using SF6 has previously been banned from applications ranging from double glazing insulation to keeping trainer soles inflated.
 Proposed EU 2031 phase out
Yet, while SF6 is still deployed in switchgear to ensure electrical safety and reliability, change is on the way. Earlier in 2022, the European Commission proposed that SF6 should be banned from most new electrical equipment by 2031, as part of its broader F-gas reduction plan. Since this move involves products, the Commission’s plans also affect the UK - and various green Euro-groups would like to see a ban even earlier than 2031.
For now, SF6 gas is widely deployed in circuit breakers and switchgear in power stations, wind turbines and electrical sub-stations, to quench arcs and stop short circuits. It has a reliable track record and maintenance requirements are low – which is handy if your equipment is, for example, part of a mega-wind turbine operating in the North Sea. It also provides compact gas-insulated switchgear which is ideal for space-constrained applications.
 MV applications – HV challenges
Even so, following an EU Report, the European Commission concluded that there is no technological barrier to eliminating SF6 in installations up to 145kV*. Indeed, for medium voltage (MV) primary and secondary switchgear, increasingly cost-effective alternatives to SF6 are already available from leading providers such as ABB, Eaton and Schneider. These companies deploy alternatives such as mixed gas, air/solid and vacuum technology. *GE Grid Solutions recently announced a contract with the UK’s SP Energy Networks for the supply of 145 kV SF6-free circuit-breakers.
Finding suitable alternatives to SF6 for even higher voltage installations is, however, more challenging. Even when feasible, the alternatives tend to be more expensive than using SF6 and the Commission is monitoring the situation. Ongoing activity includes GE’s EU-funded 2025 roadmap to extend SF6 free switchgear up to 420kV, and Hitachi ABB Power Grids 380kV substation upgrade with Germany’s TransnetBW.
 Avoiding current emissions
For existing equipment, it’s vitally important that ongoing electrical equipment operation and decommissioning does not let SF6 escape. The Environment Agency oversees UK rules on the effective recovery of the gas, which is necessary when switchgear fails or degrades. However, there is no plan for a blanket requirement to replace existing SF6 switchgear, which would significantly increase the risk of releases.
 Preparing for phase out
The European Commission is handling the phase out of SF6 with care because switchgear is a critical application. However, the alternatives increasingly offer functionality and performance, ready maintenance and no particular end of life challenges. Various manufacturers are continuing to explore the viability of replacement technologies beyond the currently achievable voltages. Meanwhile, alternatives to SF6 offer customers the prospect of future legal compliance and reduced GHG (greenhouse gas) reporting. For both customers and the industry, it’s now time to consider the prospect of an SF6-free future.
 Implications beyond the grid
The Commission’s proposal to ban SF6 in new switchgear has implications beyond network supply. For example, larger commercial buildings that move to MV installations to support fast electric vehicle charging could go SF6 free and:
- provide even greener vehicle charging:
- reduce their reported GHG footprint;
- find it easier to win green building certification and other recognition; and
- future proof their electrical systems.
This article appears on the ECA news and blog site as "Europe moves to phase out electrical sulphur hexafluoride (SF6) gas" dated December 15.
 Related articles on Designing Buildings
- Absorption refrigeration.
- BREEAM Impact of refrigerants.
- Chlorofluorocarbons CFCs.
- F gases
- Greenhouse gases.
- Hydrochlorofluorocarbons HCFCs.
- Kyoto Protocol.
- Montreal Protocol.
- Ozone depleting substance.
- Phase change.
- R22 phase out.
- R404A phase out.
- Refrigerants in buildings.
- Refrigerant selection.
- Refrigerants in building services guide TG 21/2022.
- Variable refrigerant flow.
Featured articles and news
What to do with troublesome statues?
A tricky political issue.
Designing Buildings content from and for its users
Discover more on how simple and quick it is to publish an article.
Recent users articles; Timber and retrofit
Which products, for what reasons.
Recent users articles; Digitally Built Britain
ISO 19650, BIM and data management.
Recent users articles; Interim valuations and payments
Applications, notices ad points to remember.
Recent users articles; What is H-Scaffolding?
Elements, features and areas of use.
Recent users articles; what are NZEBs ?
How do they contribute to Sustainable Development.
The most viewed articles in 2022 on Designing Buildings
Written in the past 6 months, one year and beyond.
Second stairs for new tower blocks
Government launches a 12-week consultation
Happy Festive Holidays to all our users from here at DB
On the first day of Christmas DB for the Industry...
The psychological power of the built environment.
IHBC signpost update from Lords Committee on climate
Government must support behaviour change to meet targets.
Reflecting on 2022 into 2023 with the APM WiPM SIG
Women in Project Management conference 2022.
Types, colours and processing of hydrogen on DB
Grey, green, purple, blue, yellow, turquoise, brown and black.
The Kyoto Protocol a brief reminder on DB
Adopted in 1997, ratified in 2005..
Europe moves to phase out electrical SF6 gas
Sulphur hexafluoride the world’s most potent GHG.
Biomass boiler market on the rise in Europe
Proving to be a driver for decarbonisation targets.