National Grid, GE, 3M make power grid greener with gas-insulated switchgear

National Grid, working with GE Grid Solutions and 3M, has commissioned 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 carbon dioxide.

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 National Grid equipment by 98 percent.

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The Clarion Energy Content Team is made up of editors from various publications, including POWERGRID International, Power Engineering, Renewable Energy World, Hydro Review, Smart Energy International, and Power Engineering International. Contact the content lead for this publication at

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