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Introduction

A gas which is used throughout the electricity industry as an insulating medium in switchgear, SF6 provides many tangible benefits, however it is a potent greenhouse gas with a high global warming potential (GWP).

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SF6

Working at an industry level with manufacturers, WPD are helping to develop alternatives to SF6.

We will continue to replace older oil filled switchgear with SF6 insulated switchgear.

Where an existing SF6 asset replacement is required we replace with a lower SF6 volume unit, lowering the overall SF6 bank.

Fig. 2.4.2a shows that our annual SF6 leak rate is still very small at 0.11% and in relation to our baseline year we are meeting our RIIO-ED1 target.

Fig. 2.4.2b details the weight (kg) of SF6 emitted annually, which has decreased since 2018/19 data.

Emission data is collated from the following data sources;

  • SF6 top-up figures as reported on our company asset database.
  • Decommissioned units returned to our company plant centres.
  • Units returned to manufacturers for further investigation.Emission data is collated from the following data sources;
  • SF6 top-up figures as reported on our company asset database.
  • Decommissioned units returned to our company plant centres.
  • Units returned to manufacturers for further investigation.

WPD environment report graph

WPD environment graph sf6