Researchers powered a computer for six months using nothing but algae


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Forward-looking: With energy prices soaring and the next generation of graphics cards expected to be power-guzzling monsters, what's the solution to the planet- and wallet-damaging PCs of the future? Could it be algae?

New Scientist reports that photosynthesis research group the Howe Lab from Cambridge University was able to power a computer for six months using a colony of non-toxic photosynthetic algae called Synechocystis sealed within a small container about the size of an AA battery.

The computer in question was obviously not a high-end gaming rig or even a low-end machine; it was an Arm Cortex-M0+ processor commonly found in Internet of Things devices. Nevertheless, the device was able to supply power from February to August 2021 as it sat on a windowsill, providing a continuous current across its anode and cathode.

The Arm processor ran constant calculations to simulate real-world workloads and measured the current output from the device. There were no power interruptions during its six months of operations, and the cyanobacteria have continued to produce power since the experiment ended. The device can even produce power when it's dark, possibly because the cyanobacteria continue to process surplus food.

The team believes the power comes either from the cyanobacteria producing electrons, which creates a current, or they create conditions in which the aluminum anode in the container is corroded in a chemical reaction that produces electrons.

While the experiment might not ultimately lead to algae-powered gaming PCs, it could have applications in the world of low-power IoT devices—there are expected to be one trillion IoT devices by 2035, and charging them using lithium-ion batteries would be impractical. The method could also be used to power environmental sensors or phone chargers. Researchers say algae-power is likely to be most useful in off-grid situations or remote locations.

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Posts: 1,037   +1,192
I think it'd be even cooler to have an algae farm in your backyard that feeds power to your house. Much better than a Chinese solar panel and WAY better for the environment!


Posts: 2,014   +1,204
How does it compare to photovoltaics? Back when PV was still just in university labs? The latest and greatest in university labs?

Obviously, the algae has the key advantage of being able to still produce at night (surprisingly).


Posts: 245   +220
I want that battery! Getting my chop saw and aquarium out, this won't take but a minute!

"Ridin' on the City of New Orleans"


Posts: 771   +875
They should call it the Florida Computer.

This PC would thrive and run ad infinitum on many of Florida's algae-choked beaches and canals (courtesy of polluted water run-off from Big Sugar and 1000s of over-fertilized golf courses)!!


Posts: 1,504   +1,445
According to the NewScientist article: 0.3 microwatts peak power. So one 10,000,000 times larger would generate an astounding 3 watts. Don't replace your batteries just yet.