
Sulfur hexafluoride, or SF6, is a potent greenhouse gas that has a global warming potential of 22,200 times that of CO2 over a 100-year period. It is currently used for insulation and to interrupt current in high voltage substation equipment. We have already drastically reduced SF6 leaks from our system, and we are working with partners from across the sector to identify, develop, and implement SF6-free solutions at the earliest opportunity.
National Grid is hiring additional SF6 Engineers to supervise our current SF6 inventory, aggressively reduce existing equipment leaks, and to work with manufacturers on SF6 alternatives. We recently solicited circuit breaker manufacturers for available SF6 alternatives, and as a result, we have ordered a newly introduced 115 kV vacuum circuit breaker for delivery in 2023. By letting manufacturers know utilities are in the market for more environmentally friendly solutions, we hope to not only reduce our direct emissions, but to also advance the U.S. market to offer more sustainable options for all buyers.