Authority decision on National Grid Electricity Transmission's SF6 Exceptional Event claim at Connah's Quay

Decision

Publication date

Company

Industry sector

Transmission Network

Licence type

Electricity Transmission Licence

Electricity transmission companies are financially incentivised to reduce the leakage of sulphur hexafluoride (SF6), a potent greenhouse gas used in some transmissino equipment. As some leakage of SF6 will be expected from normal operating assets, a target quantity of SF6 (measured in kg) leaking from all network assets is set for each company (based on its network characteristics). Each company is then rewarded or penalised through a revenue adjustment based on how it performs each year against the target.

If a leak of SF6 occurs on a company's network due to an event that it feels was beyond its reasonable control then the company may make a case to the Authority to designate it an Exceptional Event and for all or some of the quantity of SF6 leaked during the event to be excluded when we calculate the company's revenue reward or penalty.

This letter sets out the Authority's decision in relation to an SF6 Exceptional Event claim received from National Grid Electricity Transmission in relation to SF6 leakage on its network at Connah's Quay on 23 February 2018.