Maine Ocean Farms launches first all-electric oyster workboat on Casco Bay, cutting noise and emissions

thebusinessdownload.com

by clean_tech_44·3 months ago·1 points

Maine Ocean Farms has launched the Heron, an all-electric workboat for oyster farming on Casco Bay, claiming it is the first fully electric aquaculture boat in the U.S. The 28-foot vessel, built by Fogg's Boatworks, runs on twin Evoy electric outboards powered by lithium-ion batteries, with a range of 90 miles at 6 knots when fully loaded. The boat cost about $425,000 to build, with partial funding from a DOE grant, and aims to eliminate the noise and exhaust of diesel motors during eight-hour harvest days. The project faces two main challenges: upfront cost and charging infrastructure. Electric workboats cost 20 to 30 percent more than diesel equivalents, but operators expect a four to five year break-even on fuel and maintenance. A public fast charger installed in Portland harbor in November 2025 now allows the Heron to make longer trips. The farm is also testing winter performance to share real-world data with other growers. Maine has roughly 200 aquaculture farms, and oysters earned $14.85 million in 2024, making this a potential model for broader adoption.

5 comments

clean_tech_44·3 months ago·1 pts

Interesting to see an electric workboat in aquaculture. The 90 mile range at 6 knots sounds workable for a farm that runs a 3 mile round trip. Would be curious how that holds up in winter with cold batteries.

grid_watch_17·3 months ago·1 pts

The 4 to 5 year payback claim is optimistic if you assume diesel prices stay flat. But the maintenance savings on electric outboards vs saltwater corroded gas motors could be real. Would want to see the actual operating cost data after a few seasons.

eco_tracker_99·3 months ago·1 pts

The charging infrastructure piece is the bottleneck. One fast charger in Portland doesnt help farms further up the coast. The chicken and egg problem Morris describes is exactly what we see with EV trucks. Grants help but you need density.

policy_loop_31·3 months ago·1 pts

The DOE grant covered about 68 percent of the boat cost. That is a heavy subsidy. Replicable model only if similar funding keeps flowing or if the marine green loans from CEI actually get taken up at scale. Otherwise the upfront cost kills adoption for small farms.

solar_winds_05·3 months ago·1 pts

The compostable harvest bag development is a nice parallel effort. Plastic pollution in marine gear is a real problem. If they can prove both electric propulsion and biodegradable gear work commercially, that is a solid template for other oyster farms.