Have you ever heard the story that straw, rice husks, coffee husks, or sawdust—materials that seem disposable—can produce carbon credits and bring in new revenue? It sounds strange, but this is an approach that's being talked about a lot in circular agriculture and the voluntary carbon market.
The interesting point is that biochar is not just a soil amendment. In the right context, with the right processes and standards, biochar can generate carbon credits because it helps keep carbon in a stable form for a very long time instead of letting the biomass decompose and emit back into the atmosphere. Simply put, it's a way to turn by-products into dual value: both beneficial for the soil and able to generate revenue from carbon.
In this article you'll learn what biochar is, how it's produced, why it can generate carbon credits from biochar, how measurement and certification work, as well as considerations newcomers need to weigh before implementing it in Vietnam.
I. Biochar and carbon credits: Why is this topic attracting attention?
From agricultural by-products to carbon revenue — a story that sounds strange but is real
In many rural areas of Vietnam, agricultural by-products are often burned, wasted, or disposed of at cost. Meanwhile, companies around the world are looking for solutions to reduce emissions or remove carbon from the atmosphere to meet ESG targets and achieve carbon neutrality.
Biochar has appeared just as these two needs converge. On one side there is abundant biomass, on the other a need for solutions carbon removal that can be measured. When technology, standards, and markets mature enough, biochar can become a bridge between agriculture and carbon finance.
What is biochar? A brief explanation in plain language
Biochar is a form of charcoal produced from biomass such as straw, rice husks, coffee husks, sawdust... through pyrolysis under low or no-oxygen conditions.
The important point is that biochar differs from ordinary charcoal in its intended use. Charcoal is mainly used as fuel, whereas biochar is designed to stabilize carbon, improve soils, and serve environmental applications, including generating carbon credits.
What are carbon credits and why would a business want to buy them?
One carbon credit typically corresponds to 1 tonne CO2e of emissions reduced or removed from the atmosphere, depending on the methodology of the specific standard.
Businesses buy carbon credits for many reasons:
- To offset emissions that are hard to reduce immediately.
- To fulfill climate and ESG commitments.
- To build a greener brand in the eyes of customers and investors.
- To comply with voluntary targets or future regulations.
Why are these two concepts coming together right as the carbon market is developing?
The voluntary carbon market is expanding rapidly, especially with solutions that not only reduce emissions but also remove carbon actually from the atmosphere. Biochar belongs to this group because the carbon in biomass feedstock is converted into a more stable form that can persist for tens to hundreds of years in soil or other applications.
In short, biochar not only helps cut emissions at one link in the chain, but can also be credited as a form of long-term carbon storage. That is why this topic is receiving growing attention.
II. What is biochar and how is it produced?
Input materials: straw, rice husks, coffee husks, sawdust and biomass byproducts
Feedstock sources for biochar are very common in Vietnam. You can find them everywhere:
- Post-harvest rice straw.
- Rice husks from milling.
- Coffee husks in the Central Highlands.
- Sawdust and wood chips from wood processing.
- Bagasse, corn cobs, cashew shells, and many other biomass byproducts.
This is a major advantage because the feedstock does not need to be newly extracted, but uses existing byproduct streams. However, not all feedstocks are equally suitable. Moisture content, ash content, contaminants, and collection logistics all affect production efficiency.
Pyrolysis process: producing biochar under low or no-oxygen conditions
Pyrolysis is the process of heating biomass at high temperatures in very low-oxygen conditions. Because of the lack of oxygen, the feedstock does not burn to ash as it would in open burning, but is transformed into biochar, gases, and a portion of bio-oil.
It can be simply described as follows:
- The initial biomass contains carbon from crops.
- Through pyrolysis, part of the carbon is converted into a more stable solid form.
- This carbon fraction is "locked" in rather than being immediately released as CO2.
This mechanism is the basis for carbon credits from biochar.
How is biochar different from charcoal, activated carbon, and organic fertilizer?
Many newcomers often confuse biochar with other materials. The table below helps distinguish them quickly:
- Biochar: produced to stabilize carbon, amend soil, and store carbon long-term.
- Charcoal: primarily used as a fuel, meant to be burned for energy.
- Activated carbon: further activated to increase surface area, commonly used for water and air filtration.
- Organic fertilizer: provides nutrients to the soil but does not have the same long-term carbon storage mechanism as biochar.
If the soil is likened to a house, organic fertilizer is like food, while biochar is like a durable structural frame that helps the house maintain its structure longer.
Properties that make biochar special: stable, porous, carbon-rich
Biochar is appealing because it combines several properties:
- Rich in stable carbon: resistant to rapid microbial decomposition.
- Porous structure: helps retain water and nutrients better.
- Large surface area: provides habitat for beneficial microorganisms.
- Long-lasting in soil: can persist for many years, even for very long periods depending on conditions.
It is this stability that makes biochar valuable for both agriculture and the climate.
III. Why can biochar generate carbon credits?
Core principle: lock carbon into a stable form rather than let it decompose and be emitted
As a tree grows, it absorbs CO2 from the atmosphere and stores carbon in its trunk, leaves, and roots. If that biomass is burned outdoors or decomposes naturally, most of the carbon returns to the atmosphere as CO2 or other greenhouse gases.
When biomass is converted into biochar, part of the carbon is 'retained' in a more stable structure. So, instead of carbon cycling quickly in nature, we put it into a longer storage cycle. This is why the carbon storage mechanism of biochar is considered a form of carbon removal.
How does biochar reduce emissions over its production and use lifecycle?
Biochar can affect the climate at multiple points:
- Avoid emissions from burning residues in the fields.
- Reduce methane and nitrous oxide emissions in some agricultural contexts, depending on soil conditions and how it is used.
- Replace some materials with high emission intensity.
- Store carbon for the long term after application to soil or use in products.
However, not every biochar project is automatically counted as carbon removal. A project must demonstrate net removals after accounting for emissions from production, transport, and related steps.
What is carbon removal and how does biochar fit into this category?
Carbon removal is the activity of removing CO2 from the atmosphere and storing it for a sufficiently long time. Biochar belongs to this group because the carbon in biomass is converted into a very recalcitrant form and then stored in soil or other material systems.
Unlike many solutions that only help avoid emissions, biochar can create value because it actually reduces the amount of carbon circulating in the short biological cycle. This is a point highly valued by the voluntary carbon market.
What makes biochar different from conventional emission reduction solutions?
Many climate solutions only help slow the rate of emissions, for example fuel switching, process optimization, and energy savings. These solutions are very important, but their nature is different from carbon removal.
Biochar is special in that:
- It converts by-products into a carbon storage material.
- It provides benefits in both agriculture and the climate.
- Carbon is stored for much longer than the natural decomposition cycle.
Therefore, biochar is one of the solutions considered to have potential in the carbon removal.
IV. How are carbon credits from biochar calculated and certified?
What does a carbon credit represent?
A carbon credit typically represents 1 tonne CO2e that is avoided or removed, depending on the accounting system. But with biochar, you don't just look at the mass of biochar produced; you must convert based on the sustainable carbon content, stability, and the project's full life cycle.
In other words, you cannot simply multiply the tons of biochar to get the number of credits. The portion credited must be the amount of carbon truly net-stored after verification.
The Measurement, Reporting, and Verification (MRV) steps in a biochar project
MRV stands for Measurement, Reporting, Verification - measurement, reporting, and verification. This is the backbone of any serious carbon project.
For biochar, MRV typically includes:
- Measuring the input feedstock.
- Documenting the technology and pyrolysis conditions.
- Analyzing the carbon content and stability of the biochar.
- Calculating emissions from collection, transport, and production.
- Reporting the net amount of carbon stored.
- Verification by an independent third party.
Without robust MRV, carbon credits will not be trusted by the market.
The role of methodology, standards and independent verification bodies
Having biochar doesn't automatically mean you can sell carbon credits right away. Projects need to follow a methodology specifically accepted by the carbon standard.
Standards and independent verifiers help:
- Ensure transparency.
- Avoid misreporting or double counting.
- Increase confidence for carbon credit buyers.
- Demonstrate that the carbon is actually stored, not just promised.
This is what gives value to the voluntary carbon market, but also why the process is quite strict.
Factors affecting the number of credits generated: feedstock, technology, carbon permanence, transportation
The number of credits from biochar depends on many variables:
- Feedstock: Carbon-rich biomass with few impurities is generally more favorable.
- Technology: pyrolysis efficiency, energy consumption levels, and ability to control emissions.
- Carbon stability: The more stable the biochar, the more likely it is to be credited.
- Transport and logistics: The longer the distance, the higher the emissions.
- End use: Soil amendment, material blending, and industrial applications each have different calculation methods.
Therefore, carbon effectiveness does not depend only on the pyrolysis unit but on the entire system.
V. What benefits do biochar-generated carbon credits bring to agriculture and businesses?
Environmental benefits: reduced emissions, increased carbon storage, utilization of by-products
The environmental benefits of biochar are fairly clear:
- Reduces open-field burning of residues.
- Utilizes biomass instead of leaving it to waste.
- Contributes to long-term carbon storage.
- Supports a circular economy model in rural areas.
This is a major advantage because the solution both tackles biomass waste and supports climate objectives.
Agricultural benefits: improved soil, moisture retention, support for microbial systems, and increased fertilizer efficiency
Biochar is often mentioned as a soil amendment because it can:
- Increase water retention, useful during dry seasons.
- Improve soil structure, making the soil more friable.
- Support beneficial microorganisms.
- Reduces nutrient loss when used in combination with fertilizers.
Of course, effectiveness also depends on soil type, the type of biochar, and how it's used. Biochar should not be expected to be a cure-all, but if used properly, it can deliver very significant dual benefits.
Business benefits: generate additional revenue from carbon credits and optimize the value chain
From a business perspective, biochar opens up multiple value streams:
- Revenue from selling biochar or blended products.
- Revenue from carbon credits.
- Added value from a sustainable agriculture story.
- Optimizing the cost of processing biomass by-products.
For agricultural businesses or processing plants, this can be a way to turn a cost stream into a new revenue stream.
Risks and costs to consider before scaling up
Despite the good potential, there are still many barriers:
- Investment costs for technology and MRV systems.
- The challenge of collecting dispersed biomass feedstock.
- Volatility of carbon credit prices on the market.
- Quality requirements and product stability.
- Legal risks, standards, and actual marketability.
Frankly, not every project turns a profit immediately. You need to do careful upfront calculations to avoid completing the project only to find costs were higher than expected.
VI. How can carbon-credit biochar projects be implemented in Vietnam?
Biomass feedstock sources in Vietnam: opportunities from agriculture and wood processing
Vietnam has clear advantages in biomass:
- Rice-growing areas generate large quantities of straw and rice husks.
- The Central Highlands have abundant coffee husks.
- The wood-processing industry produces sawdust, wood chips, and wood scraps.
- Many sugarcane, corn, and cashew regions also have significant by-products.
However, the advantage of feedstock only becomes a real opportunity when there is an efficient system for collection, sorting, and processing. If residues are scattered too far apart, logistics costs can erode the carbon benefits.
Popular models: smallholder farmers, cooperatives, agribusinesses, byproduct processing plants
Some models that may be suitable:
- Smallholder farmers or farmer groups: small scale, suitable for pilot projects.
- Cooperative: collect feedstock and share equipment, suitable for local contexts.
- Agribusiness: has a more stable supply chain and outputs.
- Byproduct processing plant: large scale, suitable for industrial biochar production.
Each model has its own advantages. The important thing is to choose the model that matches the feedstock, financial capacity, and carbon objectives.
Basic steps to get started: survey feedstock, technology, standards, and partners
If you are new, you can follow this roadmap:
- Survey the types of biomass available and actual yields.
- Assess moisture content, contaminants, and collection costs.
- Choose a pyrolysis technology appropriate to the scale.
- Learn the standards, methodologies, and MRV requirements.
- Connect with consultants, verification bodies, or carbon credit offtake partners.
Don't start by asking how many credits you can sell; start by asking whether the feedstock, technology, and operational chain are clean enough and cheap enough to generate credits.
Common mistakes that make projects difficult to generate carbon credits
Some common mistakes include:
- Only looking at biochar output while overlooking lifecycle emissions.
- Not standardizing input feedstock.
- Lack of data records for MRV.
- Choosing technology unsuitable for the scale.
- Expecting the market to buy immediately without certification.
If you intend to go the distance, treat a biochar project as a system, not a single kiln.
VII. Illustrative examples and frequently asked questions about biochar and carbon credits
A simple scenario: from agricultural by-product to a carbon credit project
Imagine a coffee cooperative with a fairly stable supply of coffee husks each year. Instead of wasting or burning them, they collect the husks and feed them into a pyrolysis system to produce biochar.
This biochar is then used to amend soils in the coffee-growing areas or sold to other users. At the same time, the project records input and output data, operational emissions, and the amount of carbon stored. After validation, that net carbon can be issued as credits and sold on the voluntary carbon market.
The scenario sounds simple, but in reality it requires data governance, process standardization, and consistent outputs.
How long until biochar can generate carbon credits?
There is no fixed timeline for every project. The time depends on whether you already have available feedstock, technology, data records, and a validation partner.
Typically, a project needs time to:
- Design the model.
- Install and run trial operations.
- Collect sufficiently reliable data.
- Validate and register under a standard.
So newcomers should think in project cycles, not expect to get credits after producing a few batches of biochar.
Is biochar guaranteed to be purchased by the carbon market?
Nothing is 100% certain. Although biochar is an attractive solution, selling credits still depends on:
- Quality of certification.
- Credibility of the standard.
- Demand from buyers.
- Price and market timing.
- Ability to tell a clear, transparent impact story.
The voluntary carbon market cares deeply about transparency and real impact. The clearer a project's data, the easier it is to build trust.
Where should newcomers start if they want to get involved in this field?
If you are a farmer, agricultural business, climate startup, or ESG investor, start with four questions:
- What is my biomass source and is it stable?
- Which technology suits my current scale?
- Does the project meet carbon standards and MRV (monitoring, reporting, and verification)?
- Are the biochar outputs and carbon credits financially attractive enough?
If you can answer these four questions, you're halfway there.
VIII. Conclusion: Is biochar really an opportunity to generate sustainable carbon credits?
Short summary: biochar is not only a soil amendment material but also a carbon storage solution
Biochar is a form of biocarbon produced from biomass through pyrolysis under low-oxygen conditions. Thanks to its capacity to sequester carbon sustainably, biochar can become a carbon removal and thereby generate carbon credits.
Conditions to turn the potential into actual carbon credits
However, to turn potential into real results, a project needs:
- Clear feedstock sources.
- Appropriate technology.
- Rigorous MRV data.
- Methodology and independent verification.
- A business model robust enough for the long term.
Final message: see biochar as a system of solutions, not just a product
If you only view biochar as a type of charcoal, you'll miss the larger value. If you see it as a system linking agriculture, byproduct processing, soil restoration, and the carbon market, you'll understand why this topic is drawing increasing attention.
Suggested next actions for newcomers
- Explore available biomass sources locally or within your business.
- Run a preliminary feasibility assessment of technology and logistics.
- Research relevant carbon standards and MRV requirements for biochar.
- If needed, start with a small pilot project before scaling up.
Biochar is not a magic bullet, but if done right it can be one of the most practical ways to turn byproducts into sustainable carbon value.
