Carbon Credit Ratings for Indian Buyers (2026): BeZero vs Sylvera vs Calyx
If you are an Indian sustainability lead or CFO about to buy voluntary carbon credits, you will soon meet a new line item in vendor decks: a letter grade from BeZero, Sylvera or Calyx Global. Developers quote them, brokers price off them, and your board may ask for them. This guide explains what those ratings actually measure, where they disagree, and how to use them without outsourcing your judgement.
What carbon credit ratings are (and are not)
Carbon credit rating agencies are independent analysts that score individual projects on how likely their credits are to deliver the climate benefit they claim. Think of them as a credit-rating layer for carbon: a screen that sits on top of registry issuance, not a replacement for it. Three names come up most often in buyer conversations: BeZero Carbon, Sylvera and Calyx Global. MSCI also publishes project ratings.
A rating is not a price, a certification or a regulatory approval. It is one analyst's opinion at a point in time, and it can change as new monitoring data arrives. It also tells you nothing about whether a credit is legally eligible for a given use, such as compliance under India's Carbon Credit Trading Scheme. For that distinction, see our guide to how to buy carbon credits in India.
How the main agencies score projects
The three most-cited agencies now use an AAA-to-D letter scale, but the same letter does not mean the same thing across agencies. What differs is the question each one asks:
BeZero Carbon: rates the likelihood that a credit achieves a tonne of CO2e avoided or removed. Since 13 March 2023 it uses an eight-point scale from AAA to D, and it does not treat co-benefits as a rating factor. BeZero notes that a D does not mean a project has failed; it means the project is least likely to deliver its core carbon claim compared with other rated projects.
Sylvera: rates projects from AAA to D across three pillars: carbon score (do reported reductions match reality), additionality, and permanence. Co-benefits such as community and biodiversity impact are scored separately out of 5 and are not included in the overall rating. Some projects are marked 'not rated' where there are serious red flags or missing data.
Calyx Global: rates greenhouse gas integrity across additionality, over-crediting, permanence and overlapping claims, and publishes a separate SDG score. It moved to an eight-point AAA-to-D scale in January 2025 from an earlier A+ to E scale, so older Calyx grades you see in decks may use the previous scale.
A rating is a project-level screen, not a purchase approval. Two agencies can grade the same project differently for legitimate reasons.
Carbon Market Watch's comparison of the agencies found that their methods differ widely, including how additionality scores cap a project's overall result and how double issuance, leakage, buffers and permanence are handled. The practical lesson for Indian buyers: always ask which agency, which scale and which date a quoted rating refers to.
What the rating distribution means for your budget
Ratings matter commercially because high grades are scarce. A March 2026 analysis by carbon marketplace Senken, drawing on Sylvera's published distribution, reported that roughly three quarters of rated projects sit below BBB and that no projects were rated AAA. If a developer tells you a low-cost credit is 'rated A' or 'rated AA', check the agency's own page before you accept it.
This is also why price and rating tend to move together. Higher-rated supply is limited, so expect it to cost more than the cheapest legacy volumes. Our India carbon credit price guide shows how project type changes the range, and the same logic applies to rating tiers.
Ratings vs ICVCM CCP labels vs registry standards
Buyers often mix up three different layers of quality signal, and each answers a different question:
Registry (Verra, Gold Standard): who issued and tracks the credit. See our Verra vs Gold Standard comparison.
ICVCM CCP label: whether a programme and methodology meet the Integrity Council's Core Carbon Principles. The label applies to programmes and methodologies, not to individual projects, so it does not replace a project rating. Our CCP label explainer covers what it means in practice.
Project rating (BeZero, Sylvera, Calyx): how likely this specific project is to deliver what it claims.
A strong buying process uses all three. A CCP-labelled methodology on a respected registry can still produce a weak project, and a highly rated project may sit under a methodology that is not yet CCP-approved. Combine these signals with the due diligence steps in our high-integrity evaluation guide and independent verification checks.
A practical workflow for Indian buyers
Define the use first: voluntary claim, supplier commitment, or CCTS compliance. Ratings are relevant mainly to voluntary purchases.
Shortlist projects by type and geography, then collect ratings from at least two agencies where available, noting the date and scale for each.
Read the reasons behind a grade, not only the letter. Look at the additionality and permanence commentary, and at any over-crediting finding.
Set a minimum rating floor in your RFP and make it a contract condition, with a right to replace credits if the rating is later downgraded. Our RFP template lists the questions to ask.
Document your rationale. If you make a public claim, a clear paper trail of rating, registry and retirement evidence reduces greenwashing risk.
Be cautious about two traps. First, do not average ratings or pick whichever agency is kindest to the project; decide your policy before you see the numbers. Second, do not treat a high rating as a licence to over-claim. Credits do not reduce your reported Scope 1, 2 or 3 emissions, and your wording should reflect that.
Rating rules and agency methodologies keep evolving, and registry or ICVCM statuses change often, so confirm current grades and eligibility on the agency, registry and ICVCM websites before you sign a contract.
Where Csquare fits
Csquare helps Indian companies build a buying policy, shortlist projects, compare ratings across agencies, and negotiate contract terms that protect you if a grade changes. If you are planning a purchase this year, talk to the Csquare team and we will help you turn rating data into a defensible, budget-fit portfolio.
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