Bitcoin mining's energy mix has reached a notable milestone, with hydropower displacing natural gas as the single largest electricity source for the network, according to new industry analysis. The shift marks the first time a renewable resource has claimed the top position in Bitcoin's power stack, reflecting both geographic migration of mining operations and evolving procurement strategies among large-scale operators.

Methodology for these estimates typically combines mining facility locations, known power purchase agreements, and regional grid emission factors. Because Bitcoin miners are mobile and often opaque about exact energy contracts, the figures carry uncertainty bands that analysts acknowledge. Still, the directional trend across multiple independent trackers has been consistent: the carbon intensity of the network has declined steadily since mid-2022.

The shift also coincides with growing scrutiny from policymakers and institutional investors. Several jurisdictions have introduced or proposed reporting requirements for data center and crypto mining energy use, while major exchanges and custodians face client demand for environmental, social, and governance disclosures. Miners that can demonstrate verifiable low-carbon power contracts increasingly command premium valuations in public markets.

• Hydropower has become Bitcoin mining's largest single energy source, overtaking natural gas for the first time

• Low-carbon sources now power an estimated 59.4% of the network's ~190 TWh annual consumption