Renewable Natural Gas (RNG): What It Is and How It's Valued | Mobius

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Renewable natural gas (RNG) is pipeline-quality biomethane captured from organic waste — landfills, dairies, wastewater, and food scraps — and upgraded so it is interchangeable with conventional natural gas. Its economics are driven less by the gas itself than by the environmental credits it earns: RINs under the federal Renewable Fuel Standard and LCFS credits in low-carbon-fuel markets.

RNG has moved from niche to strategic as transportation decarbonization, utility green-gas programs, and corporate net-zero targets pull on the same limited supply. But what makes RNG valuable — and volatile — is the stack of environmental credits attached to each unit. This guide explains what RNG is, how it is produced and valued, and where the risks sit.

What is renewable natural gas (RNG)?

RNG, also called biomethane, is methane captured from the natural breakdown of organic material and cleaned to pipeline specification. Once upgraded, it is chemically identical to fossil natural gas and can be injected into the same pipelines, burned in the same equipment, or compressed into vehicle fuel — the difference is its origin and its carbon intensity, not its molecule.

How is RNG produced?

Organic waste decomposes and releases biogas, which is then upgraded — stripping out CO2, moisture, and contaminants — until it meets pipeline standards. The feedstock determines both the volume available and the carbon-intensity score that drives credit value.

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What drives RNG's value?

An RNG producer is really selling three things at once: the commodity gas, plus the environmental attributes stacked on top. Under the federal Renewable Fuel Standard, RNG used as vehicle fuel generates RINs — most commonly D3 (cellulosic) credits — whose prices can dwarf the value of the gas itself. In states with a Low Carbon Fuel Standard, RNG also earns LCFS credits scaled to its carbon intensity, so a very low- or negative-CI feedstock like dairy manure can be worth far more than landfill gas. For a deeper look at the credit side, see our explainer on D3 RINs and RNG credits.

How is RNG used?

The largest value today is in transportation, where RNG displaces diesel and conventional CNG in fleets and captures the RIN and LCFS stack. Utilities also buy RNG for voluntary green-gas and decarbonization programs, and industrial users apply it against thermal emissions. The end use matters because it determines which credits the RNG qualifies for.

What are the risks in RNG?

Three exposures dominate. Feedstock supply is finite and site-specific. Credit prices — especially D3 RINs and LCFS — are policy-driven and can swing sharply, which is where most of the revenue volatility lives. And offtake terms determine who bears that credit-price risk over the life of a project. Managing RNG economics is as much about hedging the credit stack as it is about the gas.

How Mobius Risk Group helps

Mobius advises producers, offtakers, and investors on RNG valuation, offtake structuring, and hedging the combined commodity-and-credit stack — bringing the same discipline to biomethane that we bring to conventional natural gas hedging. See more in our work on RNG in hedging strategies.

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Frequently Asked Questions

Is renewable natural gas the same as conventional natural gas?

Chemically, yes — once upgraded, RNG is interchangeable with fossil gas. The difference is its renewable origin and lower carbon intensity, which is what generates its environmental credits.

What makes RNG valuable?

The environmental credits it earns — RINs under the Renewable Fuel Standard and LCFS credits — often exceed the value of the gas itself.

What is a D3 RIN?

A cellulosic biofuel credit under the RFS. RNG used as vehicle fuel typically qualifies for D3 RINs.