A single out-of-control oil well in Niger has been belching methane for 18 days at a rate so extreme that, in climate terms, it could wipe out roughly 40% of Ireland’s entire greenhouse-gas cuts achieved last year.
The scale of the release has been uncovered by Europe’s Copernicus Atmosphere Monitoring Service (CAMS), which has been following massive methane plumes drifting across the desert in eastern Niger.
Using satellite observations, Copernicus detected emissions topping 40 tonnes of methane an hour from one oil field facility, with the incident stretching close to three weeks.
Put into an Irish frame of reference, that flow of methane is comparable to the combined emissions of about 2.8 million Irish dairy cows — nearly double Ireland’s full dairy herd.
Methane packs an outsized punch as a greenhouse gas, warming the planet about 28 times more than carbon dioxide over a 100-year timescale.
At that potency, the Niger leak equates to more than 1,100 tonnes of CO₂ equivalent every hour.
That hourly impact is similar to the combined emissions of roughly 3.9 million standard Irish petrol or diesel cars, calculated by spreading their yearly emissions evenly across every hour of the year.
It far exceeds the total number of private cars on Irish roads.
But it is the build-up over time that makes the numbers most arresting.
Europe’s Copernicus Atmosphere Monitoring Service has been tracking the methane plumes in eastern Niger (Photo: Copernicus)
Copernicus reports the leak began on 25 September and was still underway when its latest assessment was carried out on 13 October.
If the emission rate held steady at 40 tonnes an hour for that entire 18-day period, the total released would exceed 17,000 tonnes of methane.
Converted into climate impact, that would be close to half a million tonnes of CO2 equivalent — roughly the same as 40% of Ireland’s year-on-year emissions reduction.
Total emissions yet to be verified
Figures from the Environmental Protection Agency show Ireland’s greenhouse gas emissions fell by about 1.2 million tonnes of CO2 equivalent in 2025.
The decline reflected shifts across the economy, including increased reliance on renewable electricity, lower fossil-fuel use, and emissions cuts in multiple sectors.
Delivering that kind of reduction is a major national project.
It has required billions of euro in spending on renewable generation, grid upgrades, public transport, home retrofits and other efforts designed to reduce dependence on fossil fuels.
At the same time, households and businesses are being pushed to change how they heat, travel and operate, while carbon taxes, rising fuel costs and transport-related disruption remain among the more contentious effects of the transition.
Yet if the Niger well continued emitting at the rate seen by European satellites, then in just 18 days it would have effectively erased the global-warming benefit of 40% of the cuts produced by a full year of climate action in Ireland.
The episode is a vivid reminder that one industrial accident can generate emissions on a scale that rivals the hard-won annual progress of an entire country.
Copernicus cautions, however, that it has not confirmed whether emissions stayed at that level continuously, and the total volume released has not yet been verified.
‘Environmental emergency of exceptional severity’
The methane is coming from the Goumeri W-8 oil well in the Agadem oil fields in eastern Niger.
The well is operated by a subsidiary of China’s state-owned China National Petroleum Corporation (CNPC).
On 25 September, the site suffered a major blowout, sending crude oil and gas erupting uncontrollably more than ten metres into the air.
Two workers were hospitalised, the drilling platform was badly damaged, and two nearby wells may also have been compromised.
Niger’s government called the event an environmental emergency of exceptional severity.
The Environmental Protection Agency said Ireland’s greenhouse gas emissions fell by approximately 1.2 million tonnes of CO2 equivalent in 2025
Specialist teams have been deployed around the clock to contain spreading crude and regain control of the well.
Authorities have built earth embankments, trenches and collection basins to stop the oil migrating further, while crews monitor gas levels because of the danger of fire or explosion.
An independent inquiry has been opened to determine what triggered the blowout and who bears responsibility, with Algerian technical experts also brought in.
Environmental groups have warned of potential harm to grazing areas, livestock, soils and limited water supplies.
70% of methane emissions from fossil fuel operations could be avoided
Copernicus says its Methane Hotspot Explorer has flagged a series of unusually large methane plumes traced back to the damaged facility.
Sharper imagery from its Sentinel-2 satellite has been used to pinpoint the origin, and further pictures have been requested from the commercial satellite operator GHGSat.
Richard Engelen, Deputy Director of CAMS, said the finding showed how continuous satellite surveillance can quickly spot unexpected methane releases and gauge their scale.
The blowout also draws attention to a broader global issue: methane leaking from oil and gas sites, pipelines and other fossil-fuel infrastructure.
Cutting methane is widely seen as one of the quickest levers available to slow warming in the coming decades.
The International Energy Agency’s Global Methane Tracker 2026 estimates that about 70% of methane emissions from fossil-fuel operations could be avoided with technology that already exists.
That includes roughly three-quarters of emissions linked to oil and gas production.
The agency calculates more than 35 million tonnes of methane could be prevented each year at no net cost, because the value of captured gas would outweigh the expense of collecting it.
Still, it says there is no sign that worldwide methane pollution from fossil-fuel operations is falling.
The Niger blowout is an especially stark example of what is at stake.
As countries such as Ireland spend billions and ask households, farmers and businesses to make difficult changes to curb emissions, vast amounts of methane continue to escape from fossil-fuel systems elsewhere.
Satellite monitoring is making it harder to ignore these releases.
But identifying them is only the first step.
Stopping major leaks rapidly — and ensuring operators are accountable for preventing avoidable emissions — will be just as crucial if global efforts to slow warming are to succeed.
