The Subsidy Trap: Why RNG Economics Collapse Without Credit Stacking
RNG only works when you stack LCFS + RINs + 45Z. Remove any one leg and the economics collapse. That is not infrastructure. That is arbitrage. When your entire business model depends on the intersection of three volatile policy instruments, you have not built a solution. You have built a bet.
The Credit Stack
A typical RNG project at a large dairy operation generates revenue from three distinct policy instruments: the federal Renewable Fuel Standard (RINs), California's Low Carbon Fuel Standard (LCFS), and the federal 45Z clean fuel production credit. Each has different volatility, different expiration timelines, and different political risk profiles.
The problem is not any single credit. The problem is that you need all three simultaneously to make the economics work. D3 RIN values have swung from $3.00 to $0.50 in the span of 18 months. LCFS credit prices have dropped 70% from their 2022 peak. The 45Z credit faces sunset provisions and political headwinds.
When any one of these instruments weakens, project IRRs collapse. When two weaken simultaneously, projects that broke ground at $25M become stranded assets.
Who Benefits
The current credit-stacking model concentrates capital at the largest methane sources with the most sophisticated financial sponsors. A 10,000-head dairy with a well-connected developer can attract $15-25M in project finance. A 1,000-head dairy with the same methane-per-cow ratio gets nothing.
This is not a market failure. It is a policy design that rewards financial engineering over atmospheric outcomes. The developer who can model a 15-year credit stack across three regulatory regimes captures the value. The atmosphere that needs methane destroyed today is left waiting.
The Alternative
Enclosed flares destroy 98%+ of methane on-site, with no processing losses and no transport risk. They cost $200K-$500K per unit. They can be deployed in weeks, not years. They do not require a 15-year credit stack to justify the capital.
But the current policy framework offers zero incentives for flare-only destruction at agricultural sites. The LCFS does not credit it. RINs do not apply. The 45Q carbon capture credit has limited applicability.
The result: the cheapest, fastest, most reliable form of methane destruction gets no policy support, while the most expensive, slowest, and most financially complex approach gets all of it.