Battery-Powered Ships Reach 3,049 Worldwide
The global battery-powered ship fleet reached 3,049 vessels in operation or under construction as of October 2026, reflecting continued growth in marine electrification and green shipping technology, according to the Zero Emissions Ship Technology Association (ZESTAs).
In a document submitted to the International Maritime Organization (IMO) on October 20, ZESTAs reported that 2,124 vessels were operational and 925 were under construction, with total battery capacity estimated at 3.5 gigawatt-hours (GWh). The figures highlight the expanding deployment of electric propulsion systems as the maritime industry explores technologies to reduce greenhouse gas emissions.
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The number of battery-powered vessels in operation or under construction has increased by 258% since 2023, while installed battery capacity has grown by approximately 300%, according to the submission.
China Advances Battery-Swapping Technology
China has seen growing adoption of battery-swapping systems for inland and coastal vessels. The technology allows depleted batteries to be exchanged for charged units, offering an alternative to conventional charging arrangements.
ZESTAs highlighted COSCO-operated Greenwater 01 and Greenwater 02, two container ships with capacities of 654 TEU each. Both vessels feature battery systems offering capacities of up to 51.2 MWh each, demonstrating the application of large-capacity marine batteries in commercial shipping.
Hydrogen Fuel-Cell Fleet Set to Expand
Alongside battery-electric propulsion, hydrogen fuel-cell technology is emerging as another alternative for maritime emissions reduction. ZESTAs reported that hydrogen fuel-cell systems had been installed or were nearing completion on 25 vessels in 2026, with a combined nominal output of 36 megawatts (MW).
The association projects that the number will reach 44 vessels, with a combined capacity of 71 MW, by 2029.
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Implications for Maritime Decarbonization
The figures provide an update on the development of low-emission ship propulsion technology, including battery systems and hydrogen fuel cells. Their wider deployment will depend on vessel operating requirements, energy supply, infrastructure and the maturity of the technologies for different maritime applications.
The submission was presented to the IMO’s 23rd Intersessional Working Group on Reduction of GHG Emissions from Ships to provide updated information on the maturity of battery and hydrogen technologies.
ZESTAs, a non-profit maritime technology association, received consultative status at the IMO in 2022.
