Shore Power for Ocean-going Vessels

This page reviewed January 29, 2020


In December 2007, the Air Resources Board (ARB) approved the "Airborne Toxic Control Measure for Auxiliary Diesel Engines Operated on Ocean-Going Vessels At-Berth in a California Port" Regulation, commonly referred to as the At-Berth Regulation. The purpose of the At-Berth Regulation is to reduce emissions from diesel auxiliary engines on container ships, passenger ships, and refrigerated-cargo ships while berthing at a California Port. The At-Berth Regulation defines a California Port as the Ports of Los Angeles, Long Beach, Oakland, San Diego, San Francisco, and Hueneme. The At-Berth Regulation provides vessel fleet operators visiting these ports two options to reduce at-berth emissions from auxiliary engines: 1) turn off auxiliary engines and connect the vessel to some other source of power, most likely grid-based shore power; or 2) use alternative control technology that achieve equivalent emission reductions.

What's New

January 15, 2020 - Webinar on Potential 15-Day Modifications to the Proposed Regulation NEW!

CARB staff will discuss potential changes to the proposed At Berth Regulation based on Board direction during the December 5, 2019 Board Hearing and public comments recieved.  For more information, please read the webinar notice.  The staff presentation is now available.  

The webinar will be held on:

Date: January 30, 2020
Time: 10:00 a.m. to 12:00 p.m. (PST)

October 25, 2019 

CARB added the appendices from the Standardized Regulatory Impact Assessment (SRIA) to the At Berth Rulemaking Notice and extended the previous comment period of December 2, 2019 to December 9, 2019.  However, CARB encourages commenters to submit their comments in advance of the December 5, 2019 Board meeting to ensure the Board is able to consider their comments at that meeting.  More information on this errata and comment period extension can be found on the rulemaking page

October 23, 2019 - Release of Updated Files for Emissions Estimates and Health Analysis Modeling      

The updated emissions estimates and modeling files in support of the new Control Measure for Ocean-Going Vessels At Berth rulemaking are now available.  On November 9, 2018, CARB staff released draft at berth emissions estimates from auxiliary engines and boilers.  On January 16, 2019, CARB staff released the draft ocean-going vessels inventory methodology, preliminary health analyses and modeling files to support early public review and comment.  The previously released emissions estimates and modeling files have been updated as part of finalizing the emissions inventory and health risk assessment for the new Control Measure for Ocean-Going Vessels At Berth.

October 18, 2019 - Release of Rulemaking Documents  

The Proposed Control Measure for Ocean-Going Vessels At Berth has been released and the rulemaking documents are available for review and comments. Interested members of the public may present comments orally or in writing at the hearing on December 5, 2019 and may provide comments by postal mail (Clerk’s Office, California Air Resources Board, 1001 “I” Street, Sacramento California 95814) or by electronic submittal before the hearing.  The public comment period for this regulatory action will begin on October 18, 2019.  Written comments not physically submitted at the hearing must be submitted on or after October 18, 2019, and received no later than December 2, 2019  December 9, 2019.* All rulemaking documents and link for electronic submittal can be found on CARB's rulemaking page

*see October 25, 2019 posting above.

August 20, 2019 - Release of SRIA Document 

The Proposed Control Measure for Ocean-Going Vessels At Berth Standardized Regulatory Impact Assessment (SRIA) has been released and posted to the Department of Finance Major Regulations SRIAs and Calendar website.  The draft cost analysis (Appendix B) in the SRIA is now available in Excel. 

May 14 & 16, 2019 - Public Workshops

 CARB staff invites you to participate in public workshops on Tuesday, May 14, in Sacramento, California or Thursday May 16, in Long Beach, California, to discuss updates to CARB’s New At-Berth Regulation.  Each workshop will follow the same format and present the same materials.    

February 26, 2019 - Public Workshop on Updates to CARB's Ocean-Going Emissions Inventory   

 CARB staff invites you to participate in a public workshop on Tuesday, February 26, 2019 to discuss updates to CARB’s emissions inventory for the ocean-going vessels (OGV) at berth. 

January 16, 2019 - Release of Inventory Methodology  

CARB staff is releasing the draft 2018/2019 Update to Inventory for Ocean-Going Vessels (OGV): Methodology and Results document. The Inventory was last updated in 2014. This inventory was completed to support new regulatory development, and provide data to support CARB's Preliminary Health Analyses. The inventory methodology addresses new updates to the inventory including improvements to vessel visit data, emission factors, information on vessel compliance with CARB's At Berth Regulation, and growth forecasts. The results in the draft Inventory Methodology focus on the auxiliary engines and boiler emissions while at berth.

The draft OGV Inventory Methodology, and Preliminary Health Analyses are released in advance of the Initial Statement of Reasons (ISOR) for the Control Measure for Ocean-Going Vessels At Berth and At Anchor to support early public review and comment, and the opportunity for staff to make revisions prior to publication of the ISOR.

Please submit any comments on the Preliminary Health Analyses and Draft Inventory Methodology documents by Friday, February 15, 2019 to the electronic comment log.

November 9, 2018 - Draft At Berth Emissions Estimates 

CARB staff is releasing a draft At Berth Emissions Estimates from auxiliary engines and boilers under the Existing Regulation and Draft Regulatory Concept.  These estimates correspond to the proposal presented at the September 6 & 17, 2018 - 2nd Public Workshops posted on this webpage.

September 6 & 17, 2018 - 2nd Public workshops

CARB staff is hosting workshops to discuss draft regulatory concepts for the At Berth and At Anchor Regulation. A workshop will be held on September 6, 2018, in Oakland. Another identical workshop will be held on September 17, 2018, in San Pedro. Staff intends to discuss refined concepts, draft regulatory language, estimates of emissions and health risk reductions, preliminary cost analysis, and to solicit early scoping feedback on the environmental impact analysis which will be prepared for this regulatory action. Additional information will be posted here prior to the workshops.

August 14, 2018 - Preliminary Cost Analysis

CARB staff performed a preliminary cost analysis for the Control Measure for Ocean Going Vessels At Berth and At Anchor Regulation and solicited stakeholders to assist with the preliminary cost estimates. A survey requesting information on shore power infrastructure costs was sent to ports in Spring 2018 and a survey requesting vessel specifics and shore power cost information was sent to vessel owner/operators in Summer 2018 to assist staff in understanding the potential costs and savings to industry that could be incurred by the Regulation. Preliminary cost information is based on staff's analysis of data, including survey results. Preliminary cost estimates are subject to change as staff receive updated information. Vessel and port survey data is reported directly from ports and vessel fleets, and should not be cited or quoted or taken as a final cost estimate. For detailed information on the preliminary cost estimates, please refer to the link provided.

August 14, 2018 - Draft Regulatory Concepts

On July 19, 2018, CARB staff hosted a webinar with industry stakeholders to discuss staff's draft preliminary concepts for the Control Measure for Ocean Going Vessels At Berth and At Anchor Regulation. The webinar walked participants through the purpose of the draft regulatory concepts and preliminary implementation schedule, the method for determining which vessels and ports will be included in the regulation, and responsibilities for vessel owners/operators, terminals, ports, and alternative technology providers. For additional details, please refer to the link provided.

2018 Ocean-Going Vessel Technology Assessment 

CARB staff has released the draft Ocean-Going Vessel Technology Assessment for public comments.

2017 Workshop Stakeholder Comments 

Comments from the public workshops held on August 28, 2017, in Los Angeles and on September 7, 2017, in Sacramento, are now available.