On May 12, 2021, Musk announced on Twitter that Tesla would stop accepting Bitcoin payments for its vehicles, citing concerns over "rapidly increasing use of fossil fuels" for Bitcoin mining and transactions. On June 13, 2021, Musk tweeted that Tesla would again accept Bitcoin when approximately 50% of its mining is done with clean energy. On July 21, 2021, Musk gave more detail at a conference regarding when Tesla will accept Bitcoin. The CEO said the company would "most likely" resume accepting Bitcoin, pending due diligence to confirm that the percentage of renewable energy used to make Bitcoins is "at or above 50%," and on an upward trend.