Chia built its entire identity on being the clean alternative to Bitcoin. No energy-hungry mining rigs, no warehouse-sized data centers running around the clock - just unused hard drive space doing gentle, planet-friendly work. A new academic study says that story doesn't hold up.
Researchers found that Chia Network's actual carbon emissions are 18 times higher than the company's own claims, with real-world output measured at 0.88 million metric tons of CO2 per year. Chia Network, for its part, reportedly acknowledged the figure is "not far off."
The Promise Behind Chia
Chia was designed by BitTorrent creator Bram Cohen as a direct response to Bitcoin's notorious energy footprint. Instead of Proof of Work - where miners race to solve computationally expensive puzzles - Chia uses Proof of Space and Time (PoST). The idea is that you allocate unused storage capacity on hard drives, and the network uses that allocated space as a proxy for work done.
On paper, it sounds efficient. Hard drives consume a fraction of the power that GPUs and ASICs do. Chia leaned hard into this framing, positioning itself as a greener blockchain that could attract environmentally conscious investors and institutions wary of Bitcoin's climate footprint.
The problem, according to the researchers, is that the framing ignores a critical phase of how Chia actually works.
The Plotting Problem
Before a hard drive can participate in the Chia network, it has to be "plotted" - a process that fills the drive with cryptographic data and requires significant computation to execute. That initialization step is energy-intensive. The researchers, led by Soraya Djerrab, built an experimental testbed using Grid'5000 infrastructure to measure actual energy draw during plotting and combined that with theoretical modeling of the network's full operational and embodied emissions.
What they found: once you account for the energy burned during the plotting phase, plus the hardware manufacturing emissions from the drives themselves, Chia's total carbon footprint blows past its advertised numbers by a wide margin. The 0.88 MtCO2/year figure puts Chia well above most blockchains that market themselves as eco-friendly alternatives.
There's also a less obvious hardware issue. The intense write cycles during plotting dramatically shorten the lifespan of consumer solid-state drives. Early Chia farmers burned through drives at a rate that alarmed the storage industry and contributed to a global SSD shortage in 2021. The embodied carbon cost of manufacturing all those replacement drives adds to the real-world footprint in ways that aren't captured by measuring electricity consumption alone.
Chia Isn't Alone in This Problem
The broader issue the study points to is one that affects the entire "green crypto" category. Marketing claims about energy efficiency are almost universally based on narrow measurements - typically electricity consumed during steady-state operation of the network - that ignore manufacturing emissions, initialization costs, and the real-world hardware replacement cycles that validators and farmers run through.
Bitcoin critics make a similar argument about the mining industry's claims of renewable energy use. The numbers that get cited tend to be the ones that look best, not the ones that capture the full lifecycle impact.
What Chia Said
Chia Network hasn't formally disputed the study's findings. The company's acknowledgment that the 18x figure is "not far off" is a notable departure from the aggressive pushback crypto projects typically mount when their environmental claims get scrutinized. It's also a quiet admission that the gap between the company's public positioning and the measurable reality is substantial.
For investors who bought into Chia on the premise that it was a climate-responsible alternative to Bitcoin, that's a meaningful disclosure. The coin's price has struggled for years, and the environmental angle was one of the few genuine differentiators Chia could point to.
The study doesn't argue that Chia is somehow worse than Bitcoin overall - the absolute numbers are still far smaller given Bitcoin's scale. But it does make a straightforward case that the "green by design" label Chia built its brand around doesn't survive contact with a rigorous measurement framework.
If you're picking a blockchain because it's better for the planet, you probably want to see the methodology before you take the marketing at face value.
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Author: Ryan Gardner
Silicon Valley News Desk
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