Clean Shipping Act of 2025
- Sponsor
- Sen. Padilla, Alex [D-CA]
- Committees
- Environment and Public Works Committee (primary)
- Last action
- Jul 10, 2025
Bottom line
This bill sets aggressive, phased carbon intensity and zero-emission standards for the U.S. maritime shipping sector, aiming to significantly reduce greenhouse gas and air pollutant emissions from vessels.
What it actually does
This bill amends the Clean Air Act to establish a marine greenhouse gas fuel standard, mandating a phased reduction in carbon intensity for fuels used by large vessels on covered voyages, aiming for 100% reduction by 2050. It also requires the Environmental Protection Agency (EPA) to promulgate zero-emission standards for vessels at anchorage or berth in U.S. contiguous zones by 2035.
Proponents argue
Proponents argue this bill is crucial for addressing climate change by decarbonizing the shipping industry, reducing harmful air pollution in port communities, and positioning the U.S. as a leader in clean maritime technology and sustainable global trade. They would emphasize the health benefits for communities near ports and the long-term economic benefits of transitioning to cleaner fuels.
Opponents contend
Opponents may contend that the proposed standards are overly ambitious and could impose significant economic burdens on the shipping industry, potentially increasing shipping costs, disrupting supply chains, and disadvantaging U.S. ports and businesses compared to international competitors not subject to similar regulations. They might also raise concerns about the technological readiness and availability of zero-emission fuels and infrastructure.
The bill is relatively short and its core provisions are clear, making it accessible for a quick read to understand its main objectives.
Section 2, inserting new Section 212A(b)(1) into the Clean Air Act.
Phased Carbon Intensity Reduction Standards for Marine Fuels
This provision mandates the Administrator of the EPA to set new standards requiring large vessels (400 gross tonnage or more) on U.S. covered voyages to progressively reduce the carbon intensity of their fuel. The targets are 30% reduction by 2030, 58% by 2034, 83% by 2040, 92% by 2045, and 100% by 2050, all relative to a 2027 baseline.
Supporters argue
Supporters argue these ambitious targets are necessary to align the U.S. with global climate goals and drive the innovation needed for maritime decarbonization, creating a clear market signal for clean fuel development.
Critics contend
Critics may argue that the targets are too aggressive, potentially leading to significant operational challenges, increased costs for shipping, and a lack of readily available compliant fuels and technologies within the specified timelines.
Tradeoffs
Balances environmental protection and climate action against potential economic costs and technological readiness challenges for the shipping industry.
Section 2, inserting new Section 212A(b)(3) and (4) into the Clean Air Act.
Adjustments for Feasibility and International Alignment
This provision allows the EPA Administrator to adjust the carbon intensity reduction standards if they are deemed not technologically or economically feasible, requiring instead the maximum feasible reduction. It also permits the Administrator to adopt International Maritime Organization (IMO) standards if they are equally or more stringent than the bill's requirements.
Section 2, inserting new Section 212A(c) into the Clean Air Act.
Annual Greenhouse Gas Emissions Monitoring and Public Reporting
This provision requires the EPA to develop methods for monitoring and reporting compliance with the fuel standards, aiming for consistency with EU and IMO schemes. Vessel owners/operators must annually report fuel carbon intensity, fuel amount, and total GHG emissions for covered voyages. The EPA, in consultation with DOT and Coast Guard, must then publish a publicly accessible report compiling this data.
Section 3, amending Section 213 of the Clean Air Act by adding subsection (e).
Zero Emission Standards for Vessels at Port
This provision directs the EPA Administrator to establish standards by January 1, 2029, to eliminate greenhouse gas and air pollutant emissions from vessels (at anchorage or berth) in the contiguous zone of the U.S. by January 1, 2035. A feasibility clause allows for maximum feasible reduction if full elimination is not technologically or economically possible.
Defines "covered voyage" as any commercial voyage of a vessel between any ports of call under the jurisdiction of the United States, or between a U.S. port and a foreign port.
Section 2, inserting new Section 212A(a)(4) into the Clean Air Act.
Why it matters:Standard legislative practice to define terms upfront to ensure clarity throughout the bill's operative sections.
Case for: Supporters would argue this broad definition ensures comprehensive coverage of maritime emissions impacting the U.S., including both domestic and international shipping routes touching U.S. shores, thereby maximizing environmental benefits.
Case against: Critics might argue that including voyages to foreign ports could create jurisdictional complexities and competitive disadvantages for vessels serving U.S. trade routes compared to those serving other global routes not subject to similar regulations.
Estimated impact: Significantly expands the scope of regulation beyond purely domestic shipping, affecting a large portion of international maritime trade involving the U.S. and increasing the number of vessels subject to the standards.
Exempts any vessel that is on covered voyages for 30 days or fewer during a calendar year from the carbon intensity standards promulgated under this subsection.
Section 2, inserting new Section 212A(b)(5) into the Clean Air Act.
Why it matters:Standard legislative practice to include carve-outs for specific circumstances that may warrant different treatment, often to reduce administrative burden on marginal cases.
Case for: Proponents would argue this exemption provides flexibility for vessels with limited U.S. port calls, reducing administrative burden for those with minimal impact, and focusing regulatory efforts on regular operators with larger emission footprints.
Case against: Environmental groups might argue this creates a loophole, potentially allowing some emissions to go unregulated or incentivizing vessels to limit U.S. port calls to just under the threshold to avoid compliance.
Estimated impact: Reduces the number of vessels subject to the carbon intensity standards, potentially affecting a small percentage of total emissions but providing relief to certain niche operators or those with infrequent U.S. engagements.
Allows the EPA Administrator to permit averaging of carbon intensity across vessels under common ownership or control for compliance purposes, and to allow vessels to credit overcompliance with any standard towards demonstrating compliance with any future standard.
Section 2, inserting new Section 212A(b)(6) and (7) into the Clean Air Act.
Why it matters:These are technical compliance mechanisms designed to provide flexibility and incentives, rather than core policy statements, and are typically found in the fine print of regulatory bills.
Case for: Supporters would argue these provisions offer crucial flexibility, allowing companies to optimize their fleet's emissions reductions efficiently and rewarding early adopters of cleaner technologies, thereby accelerating overall decarbonization and potentially lowering compliance costs.
Case against: Some environmental advocates might express concern that averaging could allow some dirtier vessels to continue operating longer if their emissions are offset by cleaner ones within the same fleet, potentially delaying comprehensive fleet upgrades across the industry.
Estimated impact: Enhances flexibility for shipping companies in meeting compliance, potentially lowering overall compliance costs and encouraging innovation and early adoption of cleaner technologies within large fleets.