Once biochar is produced, it must be applied in an eligible way to generate carbon credits. VM0044 defines exactly which end-use applications qualify, what quality standards must be met, and which uses are completely excluded. This lesson covers the rules governing how and where biochar must be used.
Condition 9: The One-Year Rule
Biochar must be utilized within one year of production.
The carbon permanence calculation in VM0044 is based on a 100-year accounting period. The decay factor applied to biochar is established for that full 100-year window, starting from the date of production. For that decay factor to apply accurately, the biochar must enter its eligible final application within the first year after it was made.
If biochar sits in storage for longer than one year before application, the permanence assumption breaks down. VM0044 therefore treats any biochar not applied within 12 months of production as ineligible for crediting.
Condition 10: Soil Application Rules
Biochar applied to soil is the most common end use. Not all soils and not all methods of application are treated the same.
Eligible Land Types
Biochar may be applied to:
- Cropland
- Grassland
- Vegetated urban soils
- Forest
Wetlands are definitively NOT eligible for biochar soil application under VM0044.
Application Methods
VM0044 distinguishes between two ways of putting biochar into soil:
- Surface application: When biochar is spread on top of the soil rather than incorporated, it must first be mixed with other substrates. The eligible mixing partners are compost, manure, or digestate from anaerobic digestion. The mixing requirement exists because dry biochar on the surface is prone to being blown away by wind or washed away by rain (erodibility), and it can also create a fire risk in dry conditions (combustibility). Mixing with moist organic materials addresses both problems.
- Subsurface application: When biochar is incorporated into the soil below the surface (for example, by tillage or injection), it may be applied alone or mixed with other substrates. The risks of erosion and combustibility are much lower underground, so mixing is not required.
Quality Requirements for Any Soil Application
Two quality standards must be met for any biochar going into soil, regardless of the application method:
- Heavy metal and contaminant compliance: Biochar must meet the thresholds set by the International Biochar Initiative (IBI) Biochar Testing Guidelines, the European Biochar Certificate (EBC) Production Guidelines, or relevant national regulations. This protects agricultural land and food safety.
- Hydrogen to organic carbon molar ratio (H:Corg): The molar ratio of hydrogen to organic carbon must be less than or equal to 0.7.
H:Corg must be 0.7 or below for any soil application. This threshold confirms that the biochar is truly stable and highly carbonized, not simply partially charred material that will break down quickly.
Think of the H:Corg ratio as a test for how thoroughly a piece of wood has been turned into charcoal. Fresh wood contains a lot of hydrogen relative to carbon because it still has cellulose, hemicellulose, and other hydrogen-rich compounds. As you heat wood with less and less oxygen, those compounds decompose and the hydrogen content drops, leaving behind mostly aromatic carbon rings.
A low H:Corg ratio (0.7 or below) means the conversion is complete: the material is dominated by stable, aromatic carbon that resists microbial attack. A high H:Corg ratio means the material still contains lots of hydrogen-rich structures that break down more easily, releasing that stored carbon back into the atmosphere. The ratio is therefore a direct proxy for long-term carbon stability.
Condition 11: Non-Soil Application Rules
Biochar can also be incorporated into manufactured products such as cement and asphalt, where it becomes part of a long-lived physical structure. This is called a non-soil application.
Only biochar from HIGH TECHNOLOGY production facilities is eligible for non-soil applications. Biochar from low technology facilities cannot be used in non-soil applications and will not generate credits for those uses.
The reason for this restriction is about certainty. Non-soil applications depend on the biochar being permanently locked inside a manufactured product. High technology facilities have more robust process controls, emissions measurement systems, and quality assurance procedures. This provides a higher level of confidence that the carbon in the biochar is well-characterized and that production emissions are properly accounted for.
Low technology facilities (such as traditional kilns or rudimentary pyrolysis units) may produce biochar with more variable properties and less reliable emissions data. They are eligible for soil applications, which have more flexibility, but not for non-soil applications.
Condition 12: Proving Long-Lived Non-Soil Products
For non-soil applications, the project proponent must demonstrate that the product incorporating biochar is genuinely long-lived. This is not assumed; it must be proven.
Acceptable forms of evidence include:
- Laboratory test results showing the physical and chemical durability of the product.
- Peer-reviewed scientific papers demonstrating that biochar in the specific product type retains its carbon over the claimed lifetime.
- Third-party product assessments or life cycle analyses.
The evidence must include the expected lifetime of the product in which the biochar is stored. The product must also comply with applicable national or international product quality standards. For example, biochar incorporated into concrete in the United States must still produce concrete that meets American Concrete Institute (ACI) standards for compressive strength and durability.
Conditions 13 through 15: What is NOT Eligible
Several applications are specifically excluded from VM0044 crediting.
- Condition 13: Fuel uses and unproven sinks. Biochar used as a fuel substitute (charcoal for cooking, coke for industrial processes) is excluded. In these uses, the biochar is deliberately burned, releasing its stored carbon. Any application where biochar cannot be proven to function as a long-lived carbon sink is excluded.
- Condition 14: Applications that substantially oxidize biochar. Applications that chemically or thermally destroy the biochar's carbon structure are excluded. Examples include:
- Burning biochar as a fuel in any process.
- Using biochar as a reduction agent in steel production (where it reacts chemically and is consumed).
- Processing biochar into activated carbon using high-temperature steam or chemical activation that oxidizes the carbon structure.
- Any fossil fuel intensive application where the energy input causes substantial loss of biochar carbon.
- Condition 15: Non-soil applications with more than 50% carbon loss. For non-soil applications, if the application process destroys more than 50% of the original biochar carbon on a dry weight basis, it is excluded. This condition specifically targets processes like some activated carbon manufacturing methods, where the activation step uses steam or chemical treatments that can consume a large fraction of the biochar carbon. If more than half of the carbon that went in does not end up stably stored, the application does not qualify.
| Application Type | Eligible? | Key Conditions |
|---|---|---|
| Soil: cropland, grassland, vegetated urban soils, forest | Yes | H:Corg under 0.7, contaminant compliance, correct application method, applied within 1 year |
| Wetlands soil application | No | Explicitly excluded |
| Concrete (cement) | Yes (high technology only) | Long-lived product proof, national quality standard compliance, applied within 1 year |
| Asphalt | Yes (high technology only) | Long-lived product proof, national quality standard compliance, applied within 1 year |
| Other non-soil applications | Yes (high technology only, if demonstrably long-lived and under 50% carbon loss) | Long-lived product proof, carbon loss below 50%, applied within 1 year |
| Fuel (charcoal or coke substitute) | No | Carbon is combusted, not stored |
| Steel production (reduction agent) | No | Biochar is chemically consumed |
| Activated carbon (with over 50% carbon loss) | No | Exceeds 50% carbon loss threshold |
A construction materials company wants to incorporate biochar into precast concrete panels used in building facades. The biochar is produced at a high technology pyrolysis facility (Condition 11 met). The company commissions third-party laboratory testing showing that biochar in concrete does not degrade over a 100-year building lifetime, and that the concrete panels meet national building code compression standards (Condition 12 met). The biochar H:Corg is 0.45, well below the 0.7 threshold (though this threshold applies to soil applications; non-soil applications have their own permanence requirements). The biochar is applied to the concrete plant within 8 months of production (Condition 9 met). This application qualifies for VM0044 crediting.
The 50% threshold in Condition 15 represents a minimum standard of permanence. If an application destroys more than half of the incoming biochar carbon, the remaining stored carbon is a relatively small fraction of the original amount. The methodology designers determined that below this threshold, the carbon benefit is too small relative to the resources consumed to justify crediting.
For processes like activated carbon production, the activation step can consume 50% or more of the carbon through gasification or oxidation reactions. Those processes may have value for water filtration or other purposes, but they do not constitute long-term carbon storage and are therefore excluded. Projects that can demonstrate less than 50% carbon loss and a long product lifetime may still qualify, subject to the evidence requirements in Condition 12.
Key Takeaways
- 1High technology facilities must meet ALL four conditions: gas recovery/combustion, 70% heat utilization, emissions controls, and electronic temperature recording - failing any one defaults to low technology
- 2High technology production emissions are treated as de minimis (zero), while low technology facilities must account for methane emissions using a default factor of 0.049 tCH4 per tonne of biochar
- 3Only high technology biochar qualifies for non-soil applications like concrete and asphalt - low technology biochar is restricted to soil applications
- 4Organic carbon content (F_Cp) must come from laboratory analysis for high technology facilities, while low technology facilities may use Table 4 default values
- 5All biochar producers, regardless of technology level, must implement a health and safety program protecting workers from airborne pollutants