VISA has to maintain its data centers. They're working on becoming more energy efficient, but it's a long and involved process. [0] On top of that, there's also

VISA has to maintain its data centers. They're working on becoming more energy efficient, but it's a long and involved process. [0] On top of that, there's also the energy required to run the PoS terminals, I'm not sure if that was factored into the equation though because that burden is shifted to vendors. [0] http://www.businesswire.com/news/home/20170725006524/en/ http://www.businesswire.com/news/home/20170725006524/en/