Does It Count? Regulation and the Economics

7 min read

What you'll take away Map where captured CO2 is and is not credited under EU ETS, FuelEU Maritime and the IMO instruments, and reason through when the economics of capture close.

Four lessons of engineering come down to a bookkeeping question. Carbon regulation charges ships for emitting CO2; a capture plant removes CO2 before it is emitted. Whether the first fact notices the second, whether a captured tonne is a credited tonne, decides if everything you have read so far is an investment or an expensive gesture.

Three instruments, one blind spot

The clearest open treatment of this question is a ClassNK Technical Journal article, Treatment and Issues of Onboard CO2 Capture and Storage/Utilization under GHG Regulations, which walks instrument by instrument. The pattern it finds is consistent: the principle of crediting is accepted more readily than the accounting is written.

EU ETS. The emissions trading system is where credit is closest, because the directive's logic already exempts CO2 that is captured and delivered to permanent storage from the obligation to surrender allowances. The unfinished part is the machinery: an approved monitoring and verification method for the shipboard case: how the captured tonnes are metered, how custody is evidenced from the ship's tank through the offload chain of lesson 4 to a permitted storage site, and what happens to tonnes that end in utilisation instead. Until an operator can prove that chain in an approved way, the tonnes stay on the bill.

FuelEU Maritime. Here the obstacle is structural. FuelEU regulates the well-to-wake greenhouse-gas intensity of the energy used on board: a property of the fuel, computed from the fuel. A capture plant working downstream of the engine sits outside that formula entirely, however well it performs. Crediting capture under FuelEU requires amending the method itself, and the regulation's own review machinery is where that question lives.

The IMO instruments. The DCS collects fuel consumption; the CII converts it to CO2 with a carbon factor per tonne of fuel. Neither looks at the exhaust, so neither can see what was removed from it: a ship capturing 75% of her emissions reports exactly the same figures as her sister venting everything. The IMO has put onboard capture onto its working agenda, and the ClassNK article traces that work, but an agenda item is not a subtraction an owner can book.

Note the asymmetry with lesson 4: regulation is likeliest to credit permanent storage, while utilisation, the destination with the readiest commercial buyers, may return the carbon to the air and earns correspondingly harder questions.

Where a captured tonne is, and is not, credited Instrument What the rule counts Does a captured tonne count today? EU ETS FuelEU Maritime IMO DCS and CII Allowances surrendered on the CO2 the ship emits Well-to-wake GHG intensity of the energy used on board Fuel consumed × a carbon factor per tonne of fuel Closest: yes in principle missing: an approved way to meter tonnes and prove permanent storage Not as written the formula is a property of the fuel, not of the exhaust Not as written a capturing ship reports the same figures as one venting everything The principle of crediting is accepted more readily than the accounting is written.
Each instrument computes emissions from something the capture plant never touches: allowances on emitted CO2, the intensity of the fuel, bunkers times a carbon factor. Only under the ETS is the principle already settled and the accounting the missing piece.

The economics, on one page

Strip the business case to two numbers per tonne.

The cost side: amortisation of lesson 3's capex, recall the study range of 26–70% of newbuild cost, plus the energy-penalty fuel from lesson 2, plus offload, shipping and storage fees along lesson 4's chain.

The value side: what a credited tonne is worth. Under the ETS that is the allowance price: a ship capturing and delivering 10,000 tonnes a year, fully credited at 80 euros per tonne, saves 800,000 euros a year. Add whatever a FuelEU amendment might one day make a captured tonne worth, and weigh the same tonnage against a compliant-fuel premium measured in hundreds of euros per tonne of fuel.

If cost per tonne exceeds value per tonne, capture is philanthropy. The Maersk Mc-Kinney Moller Center's study judged the crossover plausible around 2030, as capture costs fall, corridors get built, and crediting rules mature. Treat the year as a scenario, not a promise, but treat the structure of the argument as sound.

When OCC makes sense

The profile that emerges from this course: a large, young ship, committed to conventional fuel for years yet; a fixed trade touching ports with a credible path to CO2 reception; and a management prepared to bet that crediting rules will mature within the investment's life. Miss the ship, the trade or the rule, and waiting, perhaps as capture-ready tonnage, is the defensible choice. Our free course Maritime Regulations Explained covers the ETS and FuelEU machinery this lesson leaned on; watch three things as they evolve: the accounting rules, the corridor projects, and the cost per delivered tonne. The day all three line up, this stops being a debate and becomes a procurement decision.

Check yourself

1. Under the IMO's DCS and CII as written, how is captured CO2 treated?
2. What is the practical gap that keeps captured CO2 from reducing an EU ETS bill?
3. Why does FuelEU Maritime, as written, offer no credit for onboard capture?
4. Which costs belong on the per-tonne cost side of the capture ledger?
5. What did the MMMCZCS study conclude about commercial readiness?
6. For capture to pay on a given ship, which conditions must hold?

Select all that apply.

7. Fitting a capture plant automatically reduces a ship's EU ETS liability.
8. A ship captures and delivers 10,000 tonnes of CO2 in a year, all of it credited at an allowance price of 80 euros per tonne. What is the credit worth for the year?
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