National Grid commissions green alternative to sulphur hexafluoride


National Grid has commissioned a green alternative to sulphur hexafluoride as an insulating gas in the substation switchgear at its Sellindge site

31 May 2017

National Grid, working with GE Grid Solutions and 3M, has commissioned the world’s first gas-insulated switchgear using an alternative to sulphur hexafluoride (SF6). Used around the world for decades, SF6 is a powerful insulation gas that allows high voltage electricity switchgear to take up less space. However, while leakage rates are extremely low, SF6 is also a potent greenhouse gas, 23,900 times worse for the environment than CO2.

National Grid has commissioned the new green alternative at the Sellindge 400,000 volt substation in Kent. The project uses 3M and GE Grid Solutions’ green gas for grid – or g3 – instead of SF6.  This reduces the Global Warming Potential of the gas used in our equipment by 98%.

Contact for media information only

Press officer - Infrastructure Projects
Jeanette Unsworth
jeanette.unsworth@nationalgrid.com
+44 (0)7785 290230

Share this page

Notes for editors


Notes to Editors:

National Grid is one of the largest investor-owned energy companies in the world and was named Responsible Business of the Year 2014 by Business in the Community. This accolade acknowledges all of our efforts in getting involve with the things that really matter to us and to society. We own and manage the grids that connect people to the energy they need, from whatever the source.  In Britain and the north-eastern states of the US we run systems that deliver gas and electricity to millions of people, businesses and communities.

In Britain, we run the gas and electricity systems that our society is built on, delivering gas and electricity across the country.  In the North Eastern US, we connect more than seven million gas and electric customers to vital energy sources, essential for our modern lifestyles.

National Grid in the UK:

  • We own the high-voltage electricity transmission network in England and Wales, operating it across Great Britain
  • We own and operate the high pressure gas transmission system in Britain
  • We also own a number of related businesses including LNG importation, land remediation and metering
  • Our portfolio of other businesses is mainly concerned with infrastructure provision and related services where we can exploit our core skills and assets to create value. These businesses operate in areas such as Metering, Grain LNG Import, Interconnectors and Property. National Grid Carbon Ltd is a wholly owned subsidiary of National Grid. It undertakes Carbon Capture Storage related activities on behalf of National Grid.

Find out more about the energy challenge and how National Grid is helping find solutions to some of the challenges we face at www.nationalgridconnecting.com

National Grid undertakes no obligation to update any of the information contained in this release, which speaks only as at the date of this release, unless required by law or regulation.

Related Photos

Norwich substation

Norwich substation

Tags:Electricity transmission, Substations

Date:01/01/0001
400kV pylon

400kV pylon

Tags:Electricity transmission, Infrastructure, Equipment

Date:01/01/0001
Connecting to life: Annual Report & Accounts 2014/15 front cover

Connecting to life: Annual Report & Accounts 2014/15 front cover

Tags:Annual Report, Electricity distribution, Electricity transmission, Field employees, Infrastructure, Landscape, Safety, Team

Date:04/04/2017

Related Videos

Where Energy Comes From

Where Energy Comes From

Tags:uk, energy, Corporate Videos, gas, National Grid UK, electricity

Date:25/11/2011
National Grid offers T-pylon for the first time in the UK.

National Grid offers T-pylon for the first time in the UK.

Tags:uk, Corporate Videos, electricity, youtube, managing the energy networks, National Grid UK

Date:22/07/2013
The Future of Energy

The Future of Energy

Tags:energy, Corporate Videos, electricity, gas

Date:25/11/2011