Offshore-wind Crew Transfer Vessels - fast cats that ferry technicians from shore to turbines. Outside CII scope; operators benchmark per technician-transfer.
Formula
$$ \text{CO}2^\text{year} = \sum_j F_j \cdot C{f,j} $$
$$ \text{Intensity} = \frac{\text{CO}2 \cdot 1000}{N\text{transfers}} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $F_j$ | Mass of fuel $j$ | t | bunker log |
| $C_{f,j}$ | CO₂ factor | t CO₂ / t fuel | MEPC.364(79) |
| $Bench (Technician transfers / year)$ | operational benchmark | – | operations log |
| $d_\text{op}$ | Operating days | d | operations log |
Diesel CTVs emit ~ 120–200 kg CO₂ per transfer. Hybrid and fully-electric CTVs entering service (Damen, Chartwell) target < 50 kg per transfer on short legs (< 25 nm round-trip).
Sources
- Crown Estate Offshore Wind Innovation - CTV operational data.
- IMO MEPC.364(79) - Cf conversion factors.