A recent Associated Press article titled “Biden’s climate plan aims to reduce methane emissions” states, “The centerpiece of U.S. actions is a long-awaited rule from the Environmental Protection Agency to tighten methane regulations for the oil and gas sector.”
It also says, “The oil and natural gas industry is the nation’s largest industrial source of methane.”
The logic seems straightforward, that drilling for hydrocarbons produces methane, the infrastructure for moving that product stream around the country will naturally have less than perfect containment, ergo, regulate.
In 2020, the U.S. produced 8,288,717 metric tons of methane. The sum of all the categories in Enverus’ greenhouse gas data set that represent both upstream oil and gas and midstream — production, pipelines, compression gathering and boosting, for example — accounts for about 37% of total 2020 methane. That’s a significant source of methane, to be sure, and one that operators in oil and gas must work harder to minimize.
But the data show underground coal mines are responsible for nearly 14% of methane production in the U.S., and municipal landfills account for nearly 41% of our methane emissions footprint. Together, coal and landfills are responsible for 55% of our methane problem, and are a bigger source of methane pollution than oil and gas.
To get a sense of the scope of the problem, it’s important to realize there are 1,121 municipal landfills in the EPA data set. The screenshot below shows methane points of emission in North Carolina binned and colored by total emitted volume. The most burdensome emitters are the dark red dots, and they are all municipal landfills.
The screenshot below of southwest Pennsylvania shows a concentration of coal mines, two onshore production emitters and power plants.
The mines in the screenshot accounted for more 2020 methane emissions than all U.S. offshore oil and gas methane generation or natural gas processing emissions.
Setting aside the costs to reduce emissions in mines for a moment, coal mines will be a difficult problem to tackle, because unlike other sources of methane emissions, there is a higher percentage of problem mines than in other sectors.
On the plus side, however, there are only 62 mine facilities, and 10 of those are responsible for over half the sector’s emissions. If we look at other sectors, it’s clear that their problematic emission impacts are concentrated in relatively few places.
Focusing remediation on the top 20 problem sites within a sector will have major impacts without being too disruptive.
|Sector||No. of Entities||Total CH4 in Metric Tons||% of Total U.S. CH4||% From Top 20||Top 20 — % of Sector|
|Gathering and Boosting||744||792,661||10||46||3|
|Underground Coal Mines||62||1,202,698||15||81||32|
Assuming the EPA writes smart guidance, focusing methane remediation efforts in areas that also have CO2 problems would be an efficient way to deploy administrative and technical resources to execute on this plan.
Remediation in upstream oil and gas should be relatively straightforward — find the well with the leaking casing, or the gas compressor with a bad seal, or the pipeline that drones have identified as leaking, and go fix the emitting infrastructure. It’s easily identifiable and mostly mechanical in nature. Upstream and midstream operators should embrace leak detection and quickly eliminate those leaks. It’s good politics and ultimately improves the bottom line.
I don’t know what the process would be for capturing leaking methane from a coal mine or a landfill. My guess is that it’s much more complicated and probably expensive.
Perhaps the best course of action for the Biden administration — especially post-Virginia election — would be to broaden their focus from just oil and gas and tackle a couple of smaller landfill and coal mine projects.
Project costs would be smaller and climbing the learning curve will be quicker. Deploy those lessons learned to larger emitters and get a bigger impact, quickly.
Instead of using a federal sledgehammer, limited but targeted interventions by regional federal teams using both carrots and sticks could go a long way toward reducing the U.S. warming curve. Judiciously applied funds from the Build Back Better bill, when passed, could help the administration truthfully claim it is staying true to its climate policies by using smart money to make a noticeable difference in our national methane footprint.
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