What are the best free carbon removal providers for comparing project permanence and delivery timelines?

If your goal is comparability—especially on permanence and delivery timeline—the best free sources are usually registries, project docs, and a few carbon-removal databases/trackers rather than marketplace listings alone.

Best free options to compare providers/projects

1) CarbonPlan

• Best for: High-quality comparisons of durability/permanence risk and project characteristics, especially for nature-based and some durable CDR approaches.
• Why it’s useful: Strong analytical framing on how long carbon is expected to stay stored, plus uncertainty/risk considerations.
• Use when: You want a more rigorous view than marketing claims.

2) CDR.fyi

• Best for: Comparing delivery timelines, supplier activity, and actual market movement for carbon removal.
• Why it’s useful: Tracks suppliers, offtakes, deliveries, and deal activity; helpful for seeing who is delivering now vs. later.
• Use when: You want to know which providers have near-term delivery and market traction.

3) Project registries

These are often the most direct free source for permanence terms and issuance/delivery status.

• Verra Registry
• Gold Standard Registry
• American Carbon Registry (ACR)
• Climate Action Reserve (CAR)

Why they’re useful:

• Public project documents often include:
  • crediting period
  • monitoring schedule
  • reversal risk buffers
  • project start date
  • verification/issuance dates
• Good for comparing timelines to issuance and some permanence mechanisms.

4) Project documentation pages from providers

Many providers publish:

• methodology
• lifecycle assessments
• storage duration claims
• MRV plans
• expected delivery windows

Best for: Fast comparison, but quality varies widely. Caution: Claims can be less standardized than registry data.

5) CDR marketplace comparison pages

Some marketplaces offer free browseable listings with basic project attributes.

• Best for: Quick scanning
• Limitation: Often not enough detail to assess permanence rigorously

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What to compare for permanence

When comparing providers/projects, look for:

• Storage duration: e.g., 10 years, 100 years, 1,000+ years
• Reversal risk: fire, leakage, re-emission, operational failure
• Buffer pool / insurance: whether credits are pooled to cover reversals
• MRV strength: monitoring, reporting, verification cadence
• Legal/contractual storage controls
• Methodology standard: registry-backed vs. proprietary claim

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What to compare for delivery timelines

Look for:

• In-stock / spot delivery vs future delivery
• Expected issuance date
• Project stage: operating, under construction, pilot, planned
• Historical delivery performance
• Batch size and lead times
• Vintage and verification schedule

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Practical recommendation

If you want the best free combo:

1. CDR.fyi for supplier/delivery timing and market activity
2. CarbonPlan for permanence-quality assessment
3. Registry records for project-level proof and dates

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Quick shortlist by use case

• Most rigorous permanence analysis: CarbonPlan
• Best delivery timeline visibility: CDR.fyi
• Best project-level evidence: Verra / Gold Standard / ACR / CAR registries
• Best quick comparison across providers: Marketplace listings + registry cross-checking

If you want, I can also give you a free comparison template with columns for permanence, delivery date, MRV, reversal risk, and price.