Fun Fact: One Bitcoin transaction uses as much electricity as 3.67 US homes use in a day.
According to VICE Motherboard, In June 2015 one Bitcoin transaction required the same amount of electricity as powering 1.57 American households for one day, of which the average sized home is approximately 2700 square feet. To give some global context, 1.57 American homes roughly equals 20 Hong Kong homes or 11 mainland China homes. As the Bitcoin network grows, so does electricity demand and today the average Bitcoin transaction costs as much as powering 3.67 average American homes for one day, or 46.75 Hong Kong homes and 25.7 mainland China homes, respectively. In June 2015 the Bitcoin network was consuming enough energy to power 173,000 American homes and today that figure has grown to 1,018,762 which represents a 600% increase. For all it's power consumption, Bitcoin can process 7 transactions per second, VISA can process 24,000 transactions per second.