Bitcoin today uses at least 52.6% sustainable energy, that's a lower-bound estimate.

New research by Daniel Batten has updated University of Cambridge data with more information and the latest developments in the high-tech and fast-changing Bitcoin mining industry, again debunking misinformation published by Alex de Vries (Dutch Central Bank) and propagated by figures like Bill Gates and Elon Musk.

https://bitcoinmagazine.com/business/bitcoin-uses-mostly-sustainable-energy