Connect with us

Hi, what are you looking for?


Air Quality

Old Tugboats Slowly Make Way for Cleaner, Energy Efficient Hybrid Tugboats

Foss Maritime is adding a second hybrid tugboat to its fleetConventional diesel tugboats are significant sources of pollution in the world’s seaports, but that is on the verge of change. The Foss Maritime Company is adding a second energy efficient hybrid tugboat to its Southern California fleet. Its first hybrid vessel, the Carolyn Dorothy, was launched in 2009 and at the time it was believed to be the first and only tugboat of its kind in the world.


The new vessel is actually a retrofit of an existing tugboat, for which the California Air Resources Board chipped in a grant of $1 million.  It’s just a small part of a major EPA program to reduce pollution in seaport areas all along the U.S. coastlines, which also includes efforts to cut emissions from trucks at seaports.

Foss Maritime and Hybrid Tugboat Technology

The basic idea behind Foss’s hybrid tugboat (pdf) is to cut down on diesel emissions related to the considerable time that tugboats spend idling or operating at low power.  The vessel’s high tech power management system integrates batteries, generators and the main diesel engines in one system that produces minimal emissions when the tug is idling or stopped.  The system also results in lower emissions when the tug is performing tasks that require less than full power.  It is expected to result in a 44 percent reduction in particulate matter and nitrogen oxide, along with lower carbon and sulfur emissions.  In addition, the hybrid system will result in lower fueling and lubrication costs, and lower lifecycle costs.

Image: Old tugboat by alpha deux cents on

Appreciate CleanTechnica’s originality? Consider becoming a CleanTechnica Member, Supporter, Technician, or Ambassador — or a patron on Patreon.
Have a tip for CleanTechnica, want to advertise, or want to suggest a guest for our CleanTech Talk podcast? Contact us here.
Written By

Tina specializes in military and corporate sustainability, advanced technology, emerging materials, biofuels, and water and wastewater issues. Tina’s articles are reposted frequently on Reuters, Scientific American, and many other sites. Views expressed are her own. Follow her on Twitter @TinaMCasey and Google+.


You May Also Like

Air Quality

Courtesy of NRDC. By Max Baumhefner & Dylan Sullivan  Nevada is considering legislation that would help the state drive on cleaner, cheaper electricity. Senate Bill (SB) 448 (Brooks)...

Air Quality

With the work-from-home trend’s emergence; lockdowns and closures of various typical gathering spaces like cinemas, restaurants, cafes, and shopping centers; most of us are...

Air Quality

Originally published on Transport & Environment. By Sam Hargreaves Future deaths like that of schoolgirl Ella Adoo Kissi Debrah are preventable, says the coroner’s report...

Air Quality

At any given time, 1,100 tons of microplastics are floating over the western United States, Wired reports. Plastic is falling from the sky —...

Copyright © 2021 CleanTechnica. The content produced by this site is for entertainment purposes only. Opinions and comments published on this site may not be sanctioned by and do not necessarily represent the views of CleanTechnica, its owners, sponsors, affiliates, or subsidiaries.