Sepa officials have varied the operating permits for Exxonmobil and Shell Fife NGL at Mossmorran.Read more
BBC Scotland, Edinburgh and East reporter
The flaring started at 22:00 on Monday at the ExxonMobil Chemical facility at Mossmorran in Fife.
A disused rail line is to reopen amid proposals for a new £70m transport project in Fife.
Longannet Power Station in Fife was closed in 2016 as part of a commitment to rely less on fossil fuels.