Onboard Carbon Capture and Storage (OCCS)
OCCS is an emissions-abatement technology, not a fuel or energy source; CII/EEXI/NZF accounting, testing, survey and certification remain to be established by applicable instruments.
Operational Explanation
OCCS is an emissions-abatement technology, not a fuel or energy source; CII/EEXI/NZF accounting, testing, survey and certification remain to be established by applicable instruments.
Regulatory Reference
IMO OCCS work plan 2025; current MARPOL methods; London Protocol and applicable transport/storage law.
Scope of Application
Ship-specific pilot/installation approval; no future credit is presumed before an express instrument.
Procedure / How to Complete It
- Define capture boundary, energy penalty and monitoring.
- Obtain design, flag/class and safety approval.
- Calculate CII/EEXI only under current methodology.
- Check reception, transport, export and permanent-storage law.
- Do not anticipate draft NZF credit.
Practical Example
Captured CO2 is measured and managed under the approved project but does not automatically create CII credit.
What Typically Goes Wrong
Calling OCCS a lower-intensity energy source or promising settled future accounting.
Common Mistakes Mistake Library
| Mistake | Consequence | How to Avoid It |
|---|---|---|
| Calling OCCS a lower-intensity energy source or promising settled future accounting. | Non-compliant decision or treatment | Follow the approved arrangement and applicable sources |
What the PSCO Checks
Operational Tips
- Separate current requirement, class/maker, SMS and voluntary guidance.
- Do not improvise tests, thresholds or intervals.
- Record deviations and corrective action.
Preparation checklist
- Abatement not fuel
- Approval
- Current accounting
- London Protocol
- No assumed credit
FAQ
Related Topics
Last substantive revision of this page: 31 August 2026 · page fingerprint 27aa165628a6