Negative
Setback or risk materialised
Medium Impact
Significant progress or notable issue
On 22 December 2023 the IFA1 fault produced a significant grid constraint on the GB system, removing approximately 2 GW of import capacity and causing a rapid frequency fall that precipitated trips of multiple generators. The resulting constraint required National Grid ESO to call on frequency response services and increase generation in southern England to stabilise system frequency and restore secure operation.