CNR International has been fined £300,000 after exceeding the permitted venting volume across its Ninian fields in the northern North Sea by 20.9 tonnes, following separate vent consent breaches in the same area.
The North Sea Transition Authority had permitted CNR to vent 272.2 tonnes between 15 June and 31 December 2024. The operator passed that limit on 26 November and reported the breach to the regulator on the same day.
The Ninian area lies about 100 miles north east of the Shetland Isles and includes the Ninian, Lyell, Columba E, Columba B/D, Orlando and Strathspey fields. CNR had already been fined £250,000 for vent consent breaches involving the same area in 2023, making the latest penalty a second enforcement action connected with its management of venting limits there.
Venting releases gas directly without combustion, while flaring burns gas before the resulting products enter the atmosphere. Both are controlled through offshore consents because they create emissions and can indicate that gas which would normally be processed, exported or used on the installation has instead been disposed of.
CNR’s permitted volume came under greater pressure during several operating disruptions in 2024. Weather affected flare operation during October, and failure of pipeline equipment operated by a third party caused a six day production outage in early November. The resulting changes to normal gas handling increased the volume sent to venting as the year progressed.
By the time cumulative emissions were approaching the authorised limit, CNR had begun preparing an application for a higher allowance for the remainder of the year. The operator exceeded the existing consent before that application was submitted, leaving 20.9 tonnes outside the volume already authorised.
NSTA consent guidance requires operators to seek revisions when it becomes apparent that an existing allowance may be insufficient, with in year changes expected to be submitted early enough for regulatory assessment. Operational events can increase cumulative venting much faster than forecast, so a consent covering several months still requires frequent comparison between actual emissions, expected future operation and the unused allowance.
A prolonged outage or flare problem can consume a substantial part of the remaining volume over a short period. Monitoring therefore has to connect directly with production planning, allowing engineers and managers to consider changes to operations or a revised consent while enough authorised capacity remains for the regulator to assess the request.
CNR has since introduced more frequent analysis of venting events, including daily review of volumes. Shorter review intervals give the operator a clearer view of how equipment faults, outages and abnormal operating conditions are affecting cumulative emissions and how quickly the remaining consent is being used.
That information has to lead to action before the limit is reached because identifying a rising total after each day only improves compliance when operational decisions or regulatory submissions follow early enough. The control process therefore links emissions measurement with maintenance, production and consent management rather than treating venting as a figure reviewed only at the end of a reporting period.
Financial consequences for later breaches have increased since the Ninian event. The NSTA told operators on 10 December 2024 that £500,000 would become the starting figure when considering penalties for flaring or venting consent breaches occurring after 1 January 2025. CNR’s latest penalty relates to emissions during November 2024, so that higher starting point did not apply.
The regulator is pursuing those controls alongside a wider objective of driving routine offshore flaring and venting towards zero by 2030 while requiring greenhouse gas emissions to be reduced as far as reasonably possible. Some flaring and venting can still be required for operational or safety reasons, leaving consent limits and active management as the mechanism for controlling volumes where releases cannot be eliminated entirely.
North Sea installations operate with equipment and infrastructure that can change condition quickly. Weather can affect flare stability, export routes can become unavailable and equipment failures can alter where gas is directed, while the permitted emissions volume remains in force through those events. Production teams therefore need enough visibility to understand how an abnormal condition changes the remaining allowance as well as the immediate process operation.
The sector has reduced its overall emissions while individual consent compliance remains separately enforceable. NSTA figures recorded a 34% reduction in offshore production emissions between 2018 and 2024, with North Sea production emissions accounting for just over 3% of total UK greenhouse gas emissions.
CNR’s earlier £250,000 penalty followed previous breaches in the Ninian area where inadequate monitoring and delayed recognition contributed to a larger exceedance. The latest case involves a smaller volume but again reached the point where the approved allowance had been passed before the required regulatory change was completed.
Daily reviews now give CNR more frequent information about venting performance, while compliance will depend on that information being converted into operational or regulatory action before a future allowance is exhausted. Equipment availability, flare performance, pipeline access and production planning all affect that process, making consent control part of routine offshore operation rather than a separate reporting activity.
