While many cryptocurrency projects strive to distance themselves from the massive energy consumption associated with Bitcoin, new research suggests that “green” alternatives may be hiding significant environmental costs. A recent study has revealed that Chia Network, a leading eco-friendly crypto alternative, may consume up to 18 times more energy than its developers initially claimed.
The Mechanics of “Green” Mining
To understand why these discrepancies exist, it is necessary to look at how different blockchains operate:
- Proof of Work (Bitcoin): This method requires massive amounts of computational power to solve complex mathematical puzzles. This process is notoriously energy-intensive, with Bitcoin consuming roughly 157 terawatt-hours annually—comparable to the energy usage of Poland.
- Proof of Space-and-Time (Chia): Instead of raw computational power, Chia uses “plotting” and “farming.” Plotting involves using processors and memory to create data files, while farming involves storing that data on hard drives to secure the network.
By moving away from constant, high-intensity calculations, Chia was marketed as a much more sustainable option for the blockchain industry.
The Missing Link: Embodied Carbon
The discrepancy identified by researchers from the Higher School of Computer Science and Digital Technologies in Algeria stems from a factor often overlooked in energy audits: embodied emissions.
When Soraya Djerrab and her team conducted their analysis using precise wattmeters, they discovered that the true environmental impact includes not just the electricity used to run the machines, but the energy required to manufacture the hardware itself.
Key findings from the study include:
- Hardware Degradation: The “plotting” phase is extremely intensive, wearing out solid-state drives (SSDs) much faster than anticipated. Researchers estimate that creating just 160 plots could destroy a brand-new SSD.
- The Carbon Gap: While Chia claimed an annual carbon footprint of 50,000 tonnes, the study places the actual figure between 0.584 and 1.402 million tonnes.
- Scale of Impact: Even at these higher levels, Chia remains less energy-intensive than Bitcoin, but its emissions are two orders of magnitude larger than mainstream blockchains like Ethereum.
“Mainly it’s from embodied emissions,” explains Djerrab. “To use Chia, people have to buy hardware. When you buy them, energy is used to create them. Chia didn’t include this when they calculated the energy used.”
The Industry Defense
Chia Network CEO Gene Hoffman acknowledges that the researchers’ figures are “not wildly off,” but he argues they provide an incomplete picture of the network’s lifecycle.
Hoffman contends that Chia’s “farming” stage actually promotes a circular economy by utilizing old hard drives from data centers that would otherwise be destined for landfills. From his perspective, the network gives a second life to “cast-off” hardware, thereby offsetting some of the environmental costs of manufacturing new devices.
Looking forward, the company is preparing to launch Proof of Space 2.0 in two months, a protocol update intended to further optimize the network and reduce its overall emissions.
Conclusion
The debate surrounding Chia highlights a critical challenge for the future of digital finance: as blockchain technology evolves, the industry must look beyond simple electricity consumption and account for the total lifecycle impact of the hardware required to sustain it.
