The Cambridge Centre for Alternative Finance (CCAF) has published a comprehensive updated study that definitively confirms the colossal environmental impact of Ethereum's transition to the Proof-of-Stake (PoS) consensus algorithm. According to the new data, the network's annual electricity consumption stands at a mere 7.87 GWh, demonstrating a staggering 99.96% reduction compared to the period immediately preceding the historic Merge update in September 2022. While the network's continuous power draw was previously estimated at 2.4 GW, where electricity served as the direct and sole cost of blockchain security, this figure has now plummeted to a modest 0.90 MW. The report's authors emphasize a fundamental paradigm shift: network security is now ensured by economically staked capital rather than massive computational power, effectively transforming electricity from a primary security factor into a routine operational expense for maintaining node operations.

To obtain the most accurate data, researchers employed a "bottom-up" methodology, measuring the actual power consumption of 20 different combinations of client software and hardware configurations. It was revealed that an average home setup consumes about 18 watts, whereas a professional workstation draws around 150 watts. Given that 64% of nodes are hosted in cloud or corporate infrastructure, while the remaining 36% operate on home connections, the average consumption calculates to approximately 105 watts per node. This calculation is based on 8,522 detectable full nodes, though the authors acknowledge this is merely a lower bound, as setups hidden behind firewalls evade monitoring. Furthermore, geographic distribution revealed a certain concentration: the US, Germany, Finland, and France collectively host about 62% of the entire infrastructure, while providers like Hetzner, AWS, and OVH service nearly 40% of the nodes, creating potential decentralization risks in the event of a simultaneous outage.

In a comparative analysis with other Proof-of-Stake networks, Ethereum demonstrates outstanding efficiency. In absolute terms, it consumes less energy than Solana (13.48 GWh per year), and when normalized for market capitalization, it expends only 33 kWh per million dollars of network value, trailing only BNB Chain in this metric and outperforming Solana by more than eightfold. Notably, the study's authors deliberately abandoned the "energy per transaction" metric, rightly pointing out that approximately 92% of all operations in the Ethereum ecosystem now occur on Layer 2 scaling networks rather than the base layer, making mainnet-only calculations inaccurate and misleading. Consequently, the network's carbon footprint has shrunk by 99.98%, amounting to just 2,370 tons of CO2-equivalent annually. This perfectly aligns with Vitalik Buterin's 2026 roadmap, which identifies eco-friendliness, scaling, and quantum resistance as the paramount priorities for the protocol's ongoing development.