TechFlow, October 20 — According to Decrypt, the latest "Cambridge Digital Mining Industry Report 2025" reveals that Bitcoin's current annual electricity consumption is estimated at 138 TWh, generating approximately 39.8 Mt of CO2 equivalent emissions. The report notes that 52.4% of Bitcoin mining energy currently comes from sustainable sources such as renewables and nuclear power.
In contrast, Ethereum reduced its energy consumption by about 99.9% after completing the "Merge" upgrade in September 2022, transitioning from proof-of-work (PoW) to a proof-of-stake (PoS) mechanism.
Experts say the environmental impact of Bitcoin mining extends beyond mere electricity use, encompassing carbon emissions, water consumption, land use, and electronic waste. As policy pressure grows, governments are increasingly focused on the types of energy used in mining, their locations, and associated externalities.
