Shore Power for Ocean-going Vessels

This page last reviewed August 22, 2008

Staff's Proposed Modified Text to the At-Berth Ocean-Going Vessels Regulation Now Available for Public Review

At its December 6, 2007, public hearing, the Board approved the adoption of staff's proposed regulations for reducing emissions from diesel auxiliary engines on container ships, passenger ships, and refrigerated cargo ships while at-berth at a California Port. The regulation was approved with modifications that were suggested by staff at the Board hearing. Staff's proposed modified language is now available for public review which ends on September 8, 2008.  The notice and proposed modified language can be found at the link below:

The regulation requires operators of vessels meeting specified criteria to turn off their auxiliary engines for most of their stay in port. We anticipate that such vessels would then receive their electrical power from the shore, or use an alternative, but equally effective, means of emission reductions. The process of shutting off engines and connecting to power on shore is sometimes referred to as "shore power" or "cold-ironing." The term "cold-ironing" is derived from the metal aboard the ships "going cold" when combustion equipment is shut down.
Background Information

In March 2006, the ARB released a draft report, Evaluation of Cold-Ironing Oceangoing Vessels at California Ports, which presented an analysis of the feasibility and cost effectiveness of cold-ironing ships at California ports. The report concluded that the most attractive vessel candidates for cold-ironing are container ships, refrigerated cargo (reefer) ships, and passenger ships, and the most likely locations for cold-ironing in California are the Ports of Los Angeles, Long Beach, Oakland, San Diego, San Francisco, and Hueneme.
In April 2006, the Board approved the Goods Movement Emission Reduction Plan, which identifies strategies for reducing emissions created from the movement of goods throughout the State. Shore power was a strategy identified for reducing hotelling emissions, with a goal of 20 percent emission reductions from cold-ironing or an equivalent reduction strategy by 2010, 60 percent reductions by 2015, and 80 percent reductions by 2020.

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