Biogas vs Biomethane vs RNG: What Energy Buyers Need to Know
Three terms. One industry. Confusion that is costing energy buyers real money.
Biogas, biomethane, and Renewable Natural Gas are not the same product at different price points. They differ in chemical composition, energy value, infrastructure compatibility, carbon credentials, and practical application. For any organisation making procurement or decarbonisation decisions, understanding these differences is not optional.
Here is a clear breakdown of each and what sets them apart.
What Each Term Actually Means
The simplest way to understand the three is by production stage:
- Biogas is the raw gas produced when organic matter breaks down without oxygen, through a process called anaerobic digestion
- Biomethane is produced when the raw biogas is purified and upgraded to remove impurities
- Renewable Natural Gas (RNG) is the North American regulatory term for the same upgraded product as biomethane
They share the same origin. But they are very different products at the point of use.
Biogas: Raw, Versatile, and Site-Dependent
Raw biogas is roughly 50–70% methane (CH?), 30–40% carbon dioxide (CO?), plus traces of hydrogen sulfide and water vapor. This makes it:
- Suitable for on-site power and heat through combined heat and power (CHP) systems
- Capable of fuelling boilers and heating systems at the production facility
What it cannot do is enter the national gas grid. The energy density is too low, and the corrosive impurities damage grid infrastructure.
For energy buyers, biogas is relevant primarily if you operate or co-invest in an on-site production facility. It is not a tradeable grid commodity in its raw state.
Biomethane: The Grid-Ready, Tradeable Product
Biomethane is what biogas becomes after upgrading — a process that strips out CO?, moisture, and hydrogen sulfide. The result is over 95% methane, chemically near-identical to fossil natural gas. This matters to energy buyers because:
- It injects directly into existing gas networks with no infrastructure modification
- It is fully interchangeable with natural gas in industrial processes, heating, and power generation
- It can be liquefied into bio-LNG for shipping or compressed into bio-CNG for vehicle fuel
- It carries Guarantees of Origin (GOs) — making sustainability claims independently verifiable
Biomethane is the product most corporate energy buyers are actually procuring when they refer to "renewable gas." It trades on the open market, connects to EU certification frameworks, and supports Scope 1 and Scope 2 emissions reduction claims.
The key difference from raw biogas: biomethane is a fungible, certifiable, grid-compatible commodity.
Renewable Natural Gas: Same Product, Different Jurisdiction
Renewable Natural Gas is not a chemically distinct product. It is upgraded biogas meeting pipeline quality standards — the same molecule as biomethane — sold under a term that dominates North American regulatory and commercial contexts.
The distinction matters for energy buyers operating across geographies:
- In the US, Renewable Natural Gas connects to the Renewable Fuel Standard (RFS), generating Renewable Identification Number (RIN) credits. The Renewable Natural Gas Incentive Act of 2025 introduced a USD 1.00-per-gallon tax credit for RNG as transportation fuel through 2035
- In Europe, the same product is called biomethane, governed by the Renewable Energy Directive (RED III), and traded with Guarantees of Origin (GOs) through registries like ERGaR
An energy buyer in Germany procures biomethane with a GO. The same buyer in the United States procures Renewable Natural Gas with a RIN. Same chemistry. Entirely different compliance and commercial logic.
Why the Differences Matter Specifically for Energy Buyers
On carbon accounting: Raw biogas used on-site reduces Scope 1 emissions at combustion. Biomethane procured via book-and-claim certificates addresses Scope 2. The method of use determines how each gas appears in a sustainability report.
On infrastructure: Biogas requires on-site or co-located use. Biomethane and Renewable Natural Gas travel through the existing gas network — no new infrastructure investment for the buyer.
On price and availability: Raw biogas is cheaper but geographically limited. Biomethane carries an upgrading cost premium but is available at scale through long-term offtake contracts. The IEA estimates that at a carbon price of USD 50 per tonne, 280 billion cubic metres of biomethane could compete directly with natural gas.
On verification: Biomethane and Renewable Natural Gas carry formal certification — Guarantees of Origin in Europe, RIN credits in North America. Raw biogas does not trade within the same certificate infrastructure.
Meet the Sector Shaping These Decisions
For energy buyers, developers, and investors navigating this space, the Leadvent Group's 2nd Annual Biogas & Biomethane Conference is where the critical conversations on production, procurement, policy, and investment are taking place.
The summit runs 27–28 May 2026 at the Radisson Blu Hotel Amsterdam Airport, Amsterdam, bringing together 150+ senior bioenergy professionals — procurement leaders, gas network operators, project developers, sustainability heads, policy professionals, and technology providers.
Agenda topics span biomethane infrastructure, RED III implementation, certification, investment models, feedstock strategy, and the role of biogas in carbon markets.
Leadvent Group specialises in senior-level energy transition events, with 60% of attendees at Head-level or above.
Register now and join the 2nd Annual Biogas & Biomethane World Summit — the premier forum for professionals driving the future of renewable gas in Europe and beyond.
Frequently Asked Questions
- Can biogas be used directly without upgrading?
Yes, but only on-site. Raw biogas works for electricity and heat through CHP systems or direct combustion in boilers. It cannot enter the national gas grid — the methane concentration is too low and impurities make it incompatible with grid standards. Upgrading to biomethane is required for grid injection, transport fuel, or industrial gas applications.
- Is Renewable Natural Gas the same as biomethane?
Chemically, yes. Both are upgraded biogas meeting pipeline quality standards. The difference is jurisdictional. Renewable Natural Gas is the standard term in North American markets, tied to the RFS and RIN credits. Biomethane is the European standard, governed by RED III and traded with Guarantees of Origin. The certification rules, incentive structures, and compliance implications differ significantly by region.
- How do the carbon credentials of biogas, biomethane, and RNG compare?
Raw biogas reduces emissions at point of combustion on-site. Biomethane and Renewable Natural Gas, when certified, support verified carbon reduction claims across the supply chain. All three deliver significant greenhouse gas savings versus fossil natural gas — the IEA estimates 51–70% lower emissions. The key variable is feedstock: manure-derived biogas can achieve negative carbon intensity by capturing methane that would otherwise enter the atmosphere.
- What is a Guarantee of Origin and why does it matter for energy buyers?
A Guarantee of Origin (GO) confirms that one megawatt-hour of energy came from a specific renewable source. For biomethane buyers, GOs create an auditable chain between procurement and source — even when the gas enters the general network. Without GOs, a biomethane claim cannot be verified. As EU reporting requirements tighten, GOs are the foundation of credible renewable gas procurement.
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