1. Carbon footprints of servers can vary by 10x. http://www.vertatique.com/carbon-footprints-servers-can-vary-10x 2009. Carbon footprints of servers can vary by 10x. http://www.vertatique.com/carbon-footprints-servers-can-vary-10x 2009.
2. Texas electricity rates & consumption. http://www.electricitylocal.com/states/texas/ 2015. Texas electricity rates & consumption. http://www.electricitylocal.com/states/texas/ 2015.
3. United states natural gas industrial price. https://www.eia.gov/dnav/ng/hist/n3035us3m.htm 2015. United states natural gas industrial price. https://www.eia.gov/dnav/ng/hist/n3035us3m.htm 2015.
4. Review of policies encouraging renewable energy integration & best practices