If the carbon price rises from KRW 30,000 to KRW 100,000, the revenue of a methane-abatement project increases. But tripling the price does not necessarily triple the project’s economic viability. The result varies greatly depending on whether the entire abatement volume is issued as saleable credits, how much measurement and verification and payments to farmers cost, and whether the quoted price is per tCO₂e or per 1 tonne of CH₄.

The first step in an economic analysis is to align the units. Carbon prices are usually quoted per 1 tonne of carbon dioxide equivalent (tCO₂e). A physical mass of 1 tonne of methane must not be treated as equivalent to 1 carbon credit. CH₄ must first be converted into CO₂e using the global warming potential (GWP) specified by the applicable scheme and methodology, and the price then multiplied by the net abatement volume eligible for issuance.

Start with the simplest calculation

For illustration, consider a hypothetical scenario that applies a 100-year GWP of 27.0 to non-fossil methane. This is the value in the IPCC 6th Assessment Report that includes climate–carbon feedbacks. A real project must use the assessment report, GWP, and time horizon specified by the applicable standard and methodology.

A net reduction of 1 tonne of methane equals 27.0 tCO₂e. Ignoring issuance losses and costs, its theoretical gross value is as follows.

  • Carbon price KRW 30,000/tCO₂e: 27.0 × KRW 30,000 = KRW 810,000

  • Carbon price KRW 50,000/tCO₂e: 27.0 × KRW 50,000 = KRW 1,350,000

  • Carbon price KRW 100,000/tCO₂e: 27.0 × KRW 100,000 = KRW 2,700,000

For 10 tonnes of methane, the corresponding figures are KRW 8.1 million, KRW 13.5 million, and KRW 27 million. These are simple examples close to an upper bound on revenue, not net profit. Baseline adjustments, uncertainty deductions, verification outcomes, buffers, and registry fees can reduce the volume available for sale.

Revenue changes when the issuance rate is included

Assume that only 80% of a project’s measured gross reduction of 1,000 tCO₂e can be issued and sold. After combining data gaps, conservative deductions, leakage, methodological exclusions, and unsold inventory, the effective saleable volume is 800 tCO₂e.

  • At KRW 30,000: gross revenue of KRW 24 million

  • At KRW 50,000: gross revenue of KRW 40 million

  • At KRW 100,000: gross revenue of KRW 80 million

If annual fixed costs are KRW 20 million, variable abatement and monitoring costs are KRW 15 million, and registration, verification, and sales costs are KRW 5 million, total costs are KRW 40 million. The project therefore loses KRW 16 million at a price of KRW 30,000, breaks even at KRW 50,000, and earns KRW 40 million at KRW 100,000. The same abatement technology can lead to a different business decision in each price range.

Not all costs are fixed, however. Feed-additive costs are proportional to the number of animals and the feeding period, while sensor and communication costs vary with the number of farms and the measurement design. Verification costs may not rise at the same rate as project size. The cost per tCO₂e from a small pilot should therefore not be applied unchanged to a large project, nor should economies of scale be taken for granted.

Calculate the break-even carbon price

The break-even price is calculated by dividing total costs by the saleable abatement volume.

Break-even carbon price = total annual project cost ÷ saleable tCO₂e

In the example above, with total costs of KRW 40 million and a saleable volume of 800 tCO₂e, the break-even price is KRW 50,000/tCO₂e. To include a target return or financing costs, add the required profit and cost of capital to the numerator. If a minimum income is guaranteed to farmers, that amount must also be included in costs.

If the issuance rate falls from 80% to 60%, the same total cost is spread over 600 tCO₂e and the break-even price rises to approximately KRW 66,667. Conversely, if better data quality raises the issuance rate to 90%, the price falls to approximately KRW 44,444. This calculation shows that measurement quality is not merely a compliance cost but also an economic variable.

At the farm level, different numbers matter

For a farmer’s decision, net benefit per animal matters more than total project revenue. The daily incremental cost of low-methane feed per animal must be compared with changes in productivity, labor time, the burden of installing equipment, and the payment received. Even with a high carbon price, the incentive to participate may be weak if most revenue goes to development, verification, and sales costs.

For example, if a farm with 100 head can sell 100 tCO₂e per year at a carbon price of KRW 50,000, gross revenue is KRW 5 million. If 35% of gross revenue is used for registry, platform, and verification costs and 15% is allocated to non-farmer investors, the farmer receives KRW 2.5 million. But if the additional feed and labor costs are KRW 4 million per year, the farmer incurs a net loss of KRW 1.5 million. At a price of KRW 100,000, the same terms yield a farmer allocation of KRW 5 million and leave KRW 1 million after costs.

Actual contracts may combine fixed and percentage fees, a floor price, advance payments, and performance bonuses. Whatever the structure, they should show the price received by the farmer, costs, and the risk of delayed issuance rather than promoting only the headline price.

Include uncertainty in abatement volume in the economic model

Treating the abatement volume as a single fixed value makes investment decisions overly optimistic. Baselines, sensor accuracy, spatial and temporal representativeness, and changes in animal numbers and production create a range of possible reductions. Optimistic, base, and conservative scenarios should be calculated separately.

For example, crossing expected net reductions of 600, 800, and 1,000 tCO₂e with prices of KRW 30,000, KRW 50,000, and KRW 100,000 produces nine outcomes. Revenue in the lowest combination is KRW 18 million, while the highest is KRW 100 million. If the range is this wide, investing to reduce measurement uncertainty and improve the issuance rate may take priority over refining the price forecast.

It is also necessary to confirm whether the methane-abatement effect persists over time. Even if an initial pilot shows a strong effect, annual performance can fall because of feeding compliance, livestock adaptation, feed supply, or farmer attrition. Long-term contract cash flows should reflect declining abatement rates, equipment replacement, and reverification costs.

Look at the price structure, not a single carbon price

The prices of emissions trading systems and carbon taxes covered by the World Bank’s carbon pricing report and voluntary credit transaction prices are not one price in a single market. Whether an agricultural project can directly sell allowances from a regulated market also differs by scheme. In voluntary markets, prices vary widely by methodology, region, vintage, co-benefits, offtake contract, and quality assessment.

It is therefore safer to use KRW 30,000, KRW 50,000, and KRW 100,000 as sensitivity-analysis ranges rather than forecasts. Determine whether the contract price is fixed or index-linked, spot or forward, and how exchange rates and taxes apply. Between the publicly quoted carbon price and the net price actually received by a project lie brokerage fees, discounts, and the risk of unsold credits.

Internal carbon prices must also be distinguished. A shadow price used by a company for investment decisions is not actual cash income. Even if an internal price of KRW 100,000 makes a project appear viable, cash flow will differ if the external credit sale price is KRW 50,000. The value of avoiding regulatory risk or meeting supply-chain targets may instead be counted as an additional benefit.

Non-carbon benefits and adverse effects

Some methane-abatement activities can provide benefits such as feed efficiency, productivity, odor reduction, and energy recovery. Conversely, they can increase feed costs, equipment power consumption, maintenance, animal-health monitoring, and operational complexity. Include only demonstrated benefits in cash flow, and do not treat the average from a research study as a guaranteed return for a specific farm.

Economic viability should be assessed from at least two perspectives: the project investor’s cash return and the farmer’s net benefit. The purchasing company’s supply-chain abatement value and the social climate benefit may also be added, but different forms of value must not be counted twice. State whether each benefit is cash actually paid to someone, the value of avoided risk, or social value.

Decision checklist

  1. Has it been confirmed that the carbon price is quoted per tCO₂e?

  2. Have the methane GWP and time horizon required by the applicable methodology been used?

  3. Has the amount eligible for issuance and sale after deductions been calculated rather than the gross reduction?

  4. Have feed, equipment, communications, verification, registration, sales, and financing costs all been included?

  5. Have the actual allocations to farmers, feed companies, platforms, and investors been distinguished?

  6. Have conservative, base, and optimistic scenarios for price, abatement volume, and issuance rate been compared?

  7. Have non-credit benefits and adverse effects been shown separately on the basis of evidence?

Conclusion: manage the break-even structure, not just the price

The theoretical carbon value of 1 tonne of methane can be KRW 810,000 in the KRW 30,000 scenario, KRW 1.35 million at KRW 50,000, and KRW 2.7 million at KRW 100,000. Actual project revenue, however, is determined by the saleable tCO₂e, net realized price, total costs, and revenue allocation. A high carbon price does not automatically solve poor data quality or excessive operating costs.

A sound economic model does not try to predict one price perfectly. It calculates the break-even price and examines the sensitivity to price, abatement volume, and issuance rate together. This reveals whether improving sensor quality, aggregating farms at scale, reducing feed costs, or securing a long-term offtake contract will have the greatest effect on viability. The carbon price is an external variable, but evidence quality and the cost structure are variables that a project can manage.

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