California Air Resources Board requires visiting ocean-going vessels to connect to shore power (or use a CARB-approved emission-control system) within a set time after berthing, in Californian ports of Los Angeles, Long Beach, Oakland, San Diego, San Francisco and Hueneme.
Compliance metric
$$ \text{ComplianceFraction} = \frac{H_\text{connected}}{H_\text{at berth}} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $ComplianceFraction$ | Share of at-berth hours on shore power / CAECS | fraction | result |
| $H_\text{connected}$ | Hours connected to shore power or approved CAECS | h | port-call log |
| $H_\text{at berth}$ | Total hours alongside, net of first-connection grace window | h | port-call log |
Regulated vessel classes (container, reefer, cruise, ro-ro, tanker from 2025/2027) must reach the fleet-average compliance thresholds set out in the rule, or pay the Remediation Fund fee per non-compliant hour.
Sources
- California Air Resources Board - Control Measure for Ocean-Going Vessels At Berth.
- 17 CCR ยง93130 - At-Berth Regulation.