Startup is developing robotics kelp farms in the open ocean to make carbon-neutral biofuel

[USA] Could a robotic kelp farm offer an alternative fuel for cars or jets? The founders behind Marine BioEnergy hope so. The startup will soon begin testing a prototype of their kelp elevator, a farm that can move up and down in the water with the help of drones to optimize access to sunlight and nutrients, near Catalina Island in California. They think biofuel made from the kelp could be cost-competitive with fossil fuels.

Marine BioEnergy’s new kelp elevator grows seaweed on a long tube, and if tests go well, they hope to start farming in the open ocean between Hawaii and California. They’re working with the Pacific Northwest National Laboratory, which has developed a way to transform kelp into biocrude. The kelp fuel should be carbon neutral since kelp absorbs around the same amount of carbon dioxide as would be emitted when the fuel is burned.

Kelp could provide a better biofuel: it has little cellulose or lignin, fibers that are hard to process. Grown in the ocean, kelp also wouldn’t require pesticides or irrigation as plants on land might. In optimal conditions, it can grow over a foot a day.

In 2015, the United States Department of Energy’s Advanced Research Projects Agency – Energy (ARPA-E) gave a grant to Marine BioEnergy, which was started by wife and husband team Cindy and and Brian Wilcox, who works a day job in space robotics at NASA’s Jet Propulsion Laboratory. Marine BioEnergy has also been working with the University of Southern California’s Wrigley Institute for Environmental Studies on a proof-of-concept study.

And the kelp elevator could help the seaweed reach those conditions, even in the open ocean. Kelp grows best in shallow coastal waters, where it can anchor to the ocean floor and receive sunlight. But to scale up kelp production, Marine BioEnergy would need the space of the open ocean. Their robotic elevator could help kelp receive the sunlight, from near the ocean’s surface, and nutrients, from deeper waters, to thrive.

Drones could also keep the kelp elevator avoid storms and stay out of the way of ships, and when the seaweed is ready, tow it to a ship. The team is trying to determine whether it might be more economical to make the biocrude right on the ship since a processing center could fit on a container ship powered by the fuel.


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