One of Heysham 2 nuclear power station's reactors was offline during the Christmas period due to a fault.
The outage on Monday December 23 was caused by an issue with the high voltage transmission system run by National Grid, EDF Energy confirmed.
EDF said it worked with National Grid over the Christmas period to fix the issue and safely return the reactor to service
They said the Office for Nuclear Regulation was kept fully informed during the incident.
“On Monday 23rd December, one of the units at Heysham 2 power station came offline following a fault on the high voltage transmission system, which is remote to the site and owned and operated by the National Grid," said an EDF spokesperson.
“Teams from EDF and the National Grid worked over the Christmas period to rectify the issue and safely return the reactor to service. Our regulators the Office for Nuclear Regulation (ONR) have been kept fully informed.”
Heysham 2’s second reactor and one of the reactors at Heysham 1 remained at full power during the outage.
Heysham 1’s second reactor was already offline for planned maintenance.
The National Grid has confirmed there was a fault at a National Grid substation remote to Heysham, coincident with Heysham 2 tripping.
EDF recently announced that Heysham 2 will extend its life to 2030, an extra two years. The plant began generating power in 1988.
Heysham 1, which began operating in 1983, will extend to 2027.
Children's play area in Lancaster opens after £118k revamp
Illegal tobacco and counterfeit clothing seized during raid on Lancaster city centre shop
Lancaster bowling green fundraiser hits target
Six food businesses in Lancaster district fail allergen tests
LISTEN: Stars of Morecambe and Wise stage show can't wait for Eric's 100th birthday
LISTEN: Thousands enjoy Wray Fair finale to annual scarecrow festival
PHOTOS and VIDEO: Incredible sand art on Morecambe beach honours Sir David Attenborough
Row over Morecambe FC debt as ex-directors' firm issues winding-up petition against club
Morecambe Pride handed £3,500 grant boost
North West awards delight for talented stars of Lancaster musicals
Music festival set for Lancaster over Bank Holiday postponed due to ‘ongoing planning’
Lancashire Police Museum in Lancaster celebrates fourth anniversary
Police investigate alleged sexual exploitation at Lancaster flat
Beyond the Beat: Two arrests after assault in Lancaster city centre
Morecambe MP "appalled" as Lancashire set to quit refugee resettlement scheme
Replica RAF helicopter to go on display in Lancaster at three-day show
Life-size knitted mannequin pops up ahead of Eric Morecambe's 100th birthday
Stars play in celebrity football match in Morecambe in memory of brave teenager
Roses are red! Lancaster University students celebrate fifth straight victory
70 homes in Carnforth evacuated after bomb scare
