Key Points
• A new University of Cambridge study found Ethereum ranks among the most energy-efficient major proof-of-stake (PoS) blockchains when measured relative to market value.
• Ethereum consumes an estimated 7.87 gigawatt-hours (GWh) of electricity annually, significantly less energy than under its previous proof-of-work system.
• The study estimates Ethereum requires approximately 33 kilowatt-hours (kWh) per $1 million of market value, the second-lowest energy intensity among the PoS networks analyzed.
• Researchers estimate that more than 56% of Ethereum’s electricity consumption comes from renewable and nuclear energy sources.
A new study from the Cambridge Centre for Alternative Finance has found that Ethereum ranks near the lower end of energy intensity among major proof-of-stake blockchain networks, offering one of the most comprehensive assessments to date of the network’s environmental footprint since its transition away from proof-of-work.
The report estimates that Ethereum currently consumes approximately 7.87 gigawatt-hours (GWh) of electricity annually, placing it below several other leading proof-of-stake networks when measured relative to economic value.
The findings provide policymakers, institutional investors and sustainability analysts with updated data as environmental considerations continue influencing blockchain adoption.
Energy Efficiency Improved Dramatically After the Merge
Ethereum’s energy profile changed fundamentally following The Merge in September 2022, when the network replaced its energy-intensive proof-of-work mining system with a proof-of-stake consensus mechanism.
Rather than relying on specialized mining hardware competing to validate transactions, the network is now secured by validators that stake Ether to participate in consensus.
The transition reduced Ethereum’s electricity consumption by an estimated 99.96%, making it one of the most significant energy reductions ever achieved by a major blockchain network.
Ethereum Among the Most Efficient PoS Networks
The Cambridge researchers compared several leading proof-of-stake blockchains using both total electricity consumption and energy intensity relative to each network’s market capitalization.
Ethereum recorded an energy intensity of approximately 33 kilowatt-hours per $1 million of market value, making it the second-most energy-efficient network in the study, behind only BNB Chain.
By comparison, Solana consumed an estimated 13.48 GWh annually, with an energy intensity of roughly 283 kWh per $1 million of market value—about 8.5 times higher than Ethereum on the same metric.
Across all proof-of-stake networks examined, total annual electricity consumption reached approximately 38 GWh.
Researchers Examined Thousands of Ethereum Nodes
To estimate Ethereum’s electricity usage, Cambridge measured power consumption across multiple hardware configurations running the network’s primary execution and consensus clients.
A typical residential node consumed around 18 watts, while higher-performance workstation configurations required approximately 153 watts.
After accounting for both residential and enterprise deployments, researchers estimated an average power consumption of approximately 105 watts per Ethereum node.
The study identified roughly 8,522 discoverable full nodes, with approximately 64% operating through cloud or enterprise infrastructure and 36% hosted on residential internet connections.
Electricity Mix Shapes Remaining Emissions
With computational mining largely eliminated, Ethereum’s remaining environmental impact is now determined primarily by the electricity sources powering validator nodes.
According to Cambridge’s estimates, approximately 56.4% of the electricity used by Ethereum nodes comes from renewable and nuclear energy sources, while the remaining 43.6% originates from fossil-fuel-powered grids.
This shift means future reductions in Ethereum’s carbon footprint will increasingly depend on broader improvements in electricity generation rather than changes to the blockchain protocol itself.
Outlook
The Cambridge study reinforces Ethereum’s transformation into one of the more energy-efficient large-scale blockchain networks following its move to proof-of-stake. While the network still consumes more electricity overall than several smaller PoS blockchains due to its global scale, its relatively low energy intensity and substantially reduced environmental footprint may strengthen its appeal among institutions, regulators and enterprises increasingly focused on sustainability as blockchain adoption expands.
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