On December 29th, according to data from Woocharts, the share of clean or sustainable energy used in mining is currently 56.76%. Since April 2021, the use of BTC clean energy has been growing steadily. The platform uses the Cambridge Center for Alternative Finance's definition of sustainability in its calculations to measure its use of clean energy. The relevant indicators depend on the proportion of crypto mining business from energy sources such as wind, solar, hydro and even nuclear power.