Offshore-wind Service Operation Vessels - hotels for technicians with integrated crew-transfer capability. Outside CII scope; industry benchmark is kg CO₂ per technician-day.
Formula
$$ \text{CO}2^\text{year} = \sum_j F_j \cdot C{f,j} $$
$$ \text{Intensity} = \frac{\text{CO}2 \cdot 1000}{N\text{tech-days}} $$
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) |
| $Bench (Technician-days / year)$ | operational benchmark | tech·d | operations log |
| $d_\text{op}$ | Operating days | d | operations log |
Modern SOVs (Edda Wind, Esvagt, Ulstein) use diesel-electric with battery peak-shaving and walk-to-work gangways. Best-in-class ~ 80 kg CO₂/technician-day; industry median 120–180.
Sources
- DNV - Offshore Wind Service Vessel Handbook.
- IMO MEPC.364(79) - Cf conversion factors.