The total Bitcoin network is using 70TWh of electricity annually or 5 WAC Bennett Dams
Annual Global Economic Costs of other industries in US Dollars
Gold Mining: $105B
Banking ( Electricity ): $63.8B
Gold Recycling: $40B
Paper Currency: $28B
Bitcoin cost of $3.5B (assuming 5 cents per kWh) annually is a small price to pay for 3 to 5 percent of the world to exchange goods and services. The Bank of Canada did a survey in December.