Twelve Miles from the Nearest Pipeline: Why RNG Can Never Reach Most Dairy Farms

In Tillamook County, Oregon, a 600-cow dairy sits twelve miles from the nearest natural gas transmission line. The farm produces enough manure to generate approximately 200,000 cubic feet of biogas per day, enough to heat about 100 homes. Under Oregon's renewable natural gas mandate, that biogas has theoretical market value. But between the digester and the grid, there is a twelve-mile gap that no current incentive program covers.

Building a dedicated pipeline connection costs between $1 million and $3 million per mile, depending on terrain, permitting, and right-of-way negotiations. For this farm, the interconnection alone would run $12 million to $36 million before the first cubic foot of gas enters the grid. The farm's annual gross revenue is around $2.4 million. The math does not work. It never will.

The Geography RNG Cannot Overcome

The renewable natural gas model depends on a physical connection between the farm and the natural gas grid. Biogas must be cleaned to pipeline quality specifications, compressed or liquefied, and injected at an approved interconnection point. Each step requires infrastructure, permitting, and ongoing maintenance.

According to the American Gas Association, the U.S. natural gas transmission and distribution network spans approximately 3 million miles. That sounds extensive until you map it against the 9,300 dairy operations with 500 or more cows that the USDA counts in its 2022 Census of Agriculture. These are the farms large enough to theoretically support an RNG project. Most are in rural areas, and rural areas are where pipeline coverage thins out.

The USDA Economic Research Service classifies roughly 72% of U.S. farmland as nonmetro, a designation that correlates with lower pipeline density. A 2023 analysis by the Environmental Defense Fund found that fewer than 30% of large livestock operations in the United States are within five miles of a gas transmission pipeline. The rest face interconnection costs that dwarf any available subsidy or credit revenue.

What the Developers Don't Mention

RNG project developers tend to focus on the roughly 300 to 400 farms where pipeline proximity, herd size, and existing infrastructure align to make a project financially viable. Those farms are real, and some of those projects are operating. But they represent a narrow slice of the problem.

The dairy industry emits approximately 3.7 million metric tons of methane per year, according to the EPA's 2024 Greenhouse Gas Inventory. The farms that can connect to a pipeline account for a fraction of those emissions. Reaching the rest, the thousands of mid-size operations scattered across rural America, requires a solution that does not depend on pipeline geography.

An enclosed flare system costs between $400,000 and $800,000 to install at a 500-cow dairy. It requires no pipeline connection, no gas quality upgrades, no utility interconnection agreements. It burns methane on-site, converting it to CO2 and water vapor. The climate math is straightforward: one ton of methane destroyed avoids the warming equivalent of 28 tons of CO2 over 100 years, or 80 tons when measured over the 20-year horizon that better reflects methane's actual atmospheric behavior.

The Interconnection Bottleneck

Even for farms close to a pipeline, the connection process is slow. A 2022 report from the Bipartisan Policy Center documented average permitting and construction timelines of 18 to 36 months for RNG interconnection projects. Some projects in California's Central Valley have taken more than four years from initial application to first gas injection.

The bottleneck is not construction. It is utility review. Gas utilities must approve the interconnection, verify gas quality specifications, negotiate delivery agreements, and in many cases upgrade local distribution infrastructure to handle bidirectional flow. Each step involves a different department, a different timeline, and a different set of regulatory requirements.

Compare that to an enclosed flare. Site assessment, permitting, and installation typically take 60 to 120 days. The farm does not need utility approval because it is not connecting to the utility. It does not need gas quality testing because it is not producing gas for sale. It does not need an interconnection agreement because there is nothing to interconnect.

The speed difference matters because methane is being emitted now. Every month a farm waits for an RNG pipeline connection is a month of unabated methane emissions. At 200 tons of methane per year for a 600-cow dairy, an 18-month permitting delay means 300 tons of methane released during the wait. At GWP20, that is 24,000 tons of CO2 equivalent warming that could have been prevented.

The Map Tells the Story

California's dairy industry is concentrated in the San Joaquin Valley, where pipeline access is relatively dense. This is not a coincidence. California is the only state where RNG economics work at scale, and even there, most projects are clustered in a narrow geographic band where pipeline proximity, LCFS credit values, and federal tax credits all converge.

Wisconsin has more dairy farms than California. Vermont has some of the highest per-cow emissions in the country due to manure management practices. Minnesota, Iowa, and New York each have significant dairy methane footprints. None of these states have the pipeline density, credit market infrastructure, or interconnection support to make RNG viable for more than a handful of farms.

The pipeline map is also the equity map. The farms that can connect are already the most valuable farms, the ones with the best location, the most capital, and the closest relationships with utilities and developers. The farms that cannot connect are the ones that climate policy most needs to reach: mid-size operations in remote counties where methane is venting freely because no economic pathway exists to stop it.

What Destruction Gets Right

Methane destruction does not solve every problem. It does not generate renewable fuel. It does not produce revenue from gas sales. It does not contribute to pipeline decarbonization goals.

What it does is work everywhere. A flare system functions on a 200-cow dairy in northern Vermont the same way it functions on a 5,000-cow operation in California's Central Valley. The technology is proven, the permitting is straightforward, and the climate benefit is immediate.

The question facing methane policy is not whether RNG is a good idea for the farms it can reach. It is whether the other 85% of dairy operations deserve a solution that does not depend on their distance from a pipe.