On a windowsill in Cambridge, a sealed capsule of cyanobacteria, the ancient blue-green algae that first learned to turn sunlight into living energy, quietly kept a small processor awake for six months. The experiment is modest in what it computes, but it speaks to a longer human question about whether our machines must forever draw from stored reserves, or whether they might one day live on the same daylight that feeds the living world. Its researchers present it as a first step, a demonstration that the idea holds rather than a promise that it will power our devices anytime soon.
Cambridge Researchers Power a Computer Chip With Algae Photosynthesis for Six Months
A chip-sized power source that ran half a year on light alone
Mark
Six months on a windowsill. Why does that duration matter more than the power output?
Mimi
Because the team expected it to quit after a few weeks. Dr. Bombelli said as much. It kept going, and that durability is the real result.
Luke
Worth saying plainly, though: this is a proof of concept. The chip did very basic calculations only, so nothing here shows it can handle real workloads.
Mark
What about the power figure itself?
Mimi
The chip drew 0.3 microwatts an hour, per New Scientist. The comparison is that you'd need roughly 333,000,000 of these units to run a 100-watt desktop.
Luke
And that desktop number is an illustrative "say," not a measurement. Real PCs vary with workload and age, so treat it as scale, not precision.
Mark
Why not just use a solar panel?
Mimi
The researchers argue algae has a smaller environmental impact and could give continuous power. It also kept producing at night using energy stored during the day.
Luke
But panels absorb about 20 percent of sunlight's energy and plants about 0.25 percent. That efficiency gap is the central obstacle, and the source doesn't say how it would be closed.
Mark
And the floating lily-pad idea?
Mimi
That's what advocates of the field imagine, mobile power stations near offshore wind farms.
Luke
Imagined is the key word. Nothing in this experiment tests it.
O Pulso
- A chip the size of nothing much ran for half a year on algae and daylight, which is unusual enough to draw attention.
- The energy output is so faint, around 0.3 microwatts doing only basic calculations, that the gap to a real computer looks almost absurd.
- Biophotovoltaics captures only a sliver of sunlight compared with solar panels, so the team must find ways to scale up before anything practical follows.
- The work is landing as a proof of concept, with researchers hoping living power sources might one day sustain the growing field of connected gadgets.
On a windowsill in Cambridge, a sealed capsule of cyanobacteria, the ancient blue-green algae that first learned to turn sunlight into living energy, quietly kept a small processor awake for six months. The experiment is modest in what it computes, but it speaks to a longer human question about whether our machines must forever draw from stored reserves, or whether they might one day live on the same daylight that feeds the living world. Its researchers present it as a first step, a demonstration that the idea holds rather than a promise that it will power our devices anytime soon.
On a windowsill at the University of Cambridge, a metal enclosure no bigger than an AA battery sat in the light for six months and kept a computer chip running. Inside was a colony of cyanobacteria, the blue-green algae that photosynthesis made famous. As they worked, they produced a tiny electric current, and that current powered an ARM Cortex-M0+, a low-energy processor.
The researchers call it a proof of concept. Their hope is that living power systems like this one could someday run the small connected gadgets of the Internet of Things, which need steady power and are multiplying quickly. Professor Christopher Howe, a senior author of the paper, argued that such devices will need systems that generate energy rather than merely store it. Unlike a battery, which slowly runs down, this one draws on light all the time, and even at night it drew on energy stored during the day.
The demonstration was modest. The chip performed only very basic calculations, drawing 0.3 microwatts, a sliver of what a desktop PC needs. What struck Dr. Paolo Bombelli, the paper's first author, was endurance. The team had expected the system to fail within weeks, but it kept going, requiring no feeding at all.
The field, biophotovoltaics, has an obvious weakness: photosynthesis is highly inefficient, capturing about 0.25 percent of sunlight's energy, against roughly 20 percent for solar panels. Advocates counter that such systems could be cheap and environmentally gentle. Some imagine floating algae-coated platforms beside offshore wind farms, though that remains speculation. For now, the team acknowledges it must scale up. What it has shown is small but steady: a power source that ran on light alone for half a year, with no sign of faltering.
On a windowsill at the University of Cambridge, a metal enclosure about the size of an AA battery sat in the light for six months and kept a computer chip running. Inside it was a colony of cyanobacteria, commonly called blue-green algae. Through photosynthesis, the colony produced a tiny electric current, and that current powered an ARM Cortex-M0+ chip, a low-energy processor.
New Scientist reported the details of the setup, and the Cambridge team described the work in a paper and a press statement. The researchers call it a proof of concept. Their longer-term hope is that natural power systems like this one could eventually run Internet of Things devices, the growing category of small connected gadgets that need steady power.
The case they make for algae over batteries or solar panels rests on two points: a smaller environmental impact, and the potential for continuous power. Professor Christopher Howe, a joint senior author of the paper, framed it as a question of where the energy comes from. The Internet of Things needs more and more power, he said, and he thinks it will have to come from systems that generate energy rather than simply store it, as batteries do. His team's device, he said, doesn't run down the way a battery does, because it uses light as its energy source all the time.
The numbers show how modest the demonstration was. The chip carried out only very basic calculations, and during that work it consumed 0.3 microwatts an hour, according to New Scientist. That is a sliver of what an average PC draws. The source offers a rough comparison: if a desktop computer consumes 100 watts, you would need roughly 333,000,000 of these algae units to run it.
What impressed the researchers was endurance. The algae needed no feeding and took all the energy it required from natural sunlight. It also kept producing power at night, working from energy it had stored during the day. Dr. Paolo Bombelli, first author of the paper, said the team was struck by how consistently the system worked over such a long stretch. They had thought it might stop after a few weeks, he said, but it just kept going.
The project belongs to a field called biophotovoltaics, which aims to harness the power generated by microorganisms that naturally convert light into electricity through photosynthesis. The field has an obvious weakness. The process is highly inefficient: plants absorb only 0.25 percent of the energy in sunlight, compared with about 20 percent for solar panels. Advocates counter that biophotovoltaic systems could be cheap to produce and environmentally friendly.
Some of them picture large floating "lily-pads" coated in algae, serving as mobile power stations alongside offshore wind farms. That remains an imagined future use, not something the Cambridge work tests.
The researchers acknowledge they will need to scale up their solution. For now, the result is a small, steady one: a chip-sized power source that ran for half a year on light alone, with no sign of running down. Whether it can be made to deliver meaningfully more than 0.3 microwatts is the open question.
Citações Notáveis
Our photosynthetic device doesn't run down the way a battery does because it's continually using light as the energy source.— Professor Christopher Howe, joint senior author
We were impressed by how consistently the system worked over a long period of time; we thought it might stop after a few weeks but it just kept going.— Dr. Paolo Bombelli, first author
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