The flaring which has lit up the skies over Mossmorran is finally at an end.
ExxonMobil Chemical completed work to recommission a pump which had failed and return to normal operations.
The latest incident started on Saturday evening.
Since then more than 30 complaints have been lodged with the Scottish Environment Protection Agency from worried members of the local community.
A spokesman for ExxonMobil said the elevated flaring stopped at 7.44pm on Wedneday evening.
The company’s plant manager at Fife Ethylene Park, Sonia Bingham, said: “My operations team at FEP has worked around the clock over the past four days to restore normal operations at the plant.
“I recognise that flaring can cause inconvenience and frustration to local residents, and we have made every effort to minimise the size of the flare and any disturbance to the local community.”
She added she was grateful to local residents for their patience and understanding and apologised to those of the plant’s neighbours who may have been disturbed by this flaring event.
“I would like to assure everyone that we never flare unless strictly necessary and are working to minimise such occurrences.
“Flaring is an essential part of the plant’s safety systems, designed specifically to handle gas when there is an interruption to the production process.”
ExxonMobil Chemical will be conducting a thorough review into the root cause of the flaring event.
The company, and fellow plant operators Shell UK were given a final warning from Sepa last month after a probe into an incident last June.
Two other incidents of flaring which have happened since then are still under investigation by the environmental watchdog.
