This morning, Island Princess became the first ship to plug into the Port of San Francisco’s new shore power, which is also the first port in the state to offer the facility.
"Cold ironing" allows a ship to plug into the city’s power grid and shut down their engines while in port, thus reducing air emissions.
The process of connecting the ship’s four, three-and-a-half inch power cables takes about 40 minutes to connect and power down the ship’s engines. (Another 40 minutes is required when the ship is ready to leave.)
Island Princess' connection to shore power is shown below.