According to Visa's 2018 report, they consumed about 0.1TWh while processing an average of 4000 transactions per second [1]. Bitcoin consumes 121TWh per year t

According to Visa's 2018 report, they consumed about 0.1TWh while processing an average of 4000 transactions per second [1]. Bitcoin consumes 121TWh per year to process 4-7 transactions per second [2]. [1] https://usa.visa.com/dam/VCOM/download/corporate-responsibility/visa-2018-corporate-responsibility-report.pdf https://usa.visa.com/dam/VCOM/download/corporate-responsibil... [2] https://cbeci.org/cbeci/comparisons https://cbeci.org/cbeci/comparisons