The Economics of Enclosed Flares at Sub-Scale Sites
At $200K-$500K per unit versus $8-25M for an RNG facility, enclosed flares represent a fundamentally different approach to methane destruction. The economics are simpler, the deployment is faster, and the atmospheric outcomes are better. The only thing missing is the policy support.
Capital Cost Comparison
An enclosed flare system for a typical 500-1,000 head dairy costs $200K-$500K installed, including biogas collection, condensate management, and continuous monitoring. The system can be operational in 4-8 weeks from order.
An RNG project at the same site (if it were economically viable, which at this scale it is not) would cost $8-15M for upgrading equipment, compression, pipeline interconnect, and gas quality monitoring. Development timeline: 24-36 months.
For the capital cost of one RNG project, you could deploy enclosed flares at 20-50 sites. The aggregate methane destruction would be higher, the timeline would be faster, and the net atmospheric benefit would be greater.
Operating Economics
Enclosed flares have minimal operating costs. Electricity for blowers and monitoring systems runs $2,000-$5,000 per month. Maintenance is straightforward: burner inspection, condensate management, and monitoring calibration.
RNG facilities carry operating costs of $500K-$1.5M annually for upgrading equipment maintenance, compression, gas quality testing, pipeline tariffs, and credit market administration. These costs persist regardless of credit prices.
When credit markets soften, as they have since 2022, RNG projects face margin compression. Enclosed flares have no credit exposure. Their operating economics do not change with policy.
The Deployment Math
If the policy framework created a destruction credit worth even $5-10 per ton of CO2e destroyed, the economics of enclosed flares at sub-scale sites would be compelling. A 500-head dairy destroying 2,000 tons of CO2e annually would generate $10,000-$20,000 in credit revenue. Modest, but enough to offset operating costs and create a payback period under 5 years.
Multiply across 17,500 sites. The aggregate methane destruction would exceed what the entire RNG industry achieves today, at a fraction of the capital cost and with better net destruction efficiency.
The policy does not exist. But the math does.