1. World Development Indicatorshttp://www.google.com/publicdata/explore?ds=d5bncppjof8f9
2. Smart Grid—Department of Energyhttp://energy.gov/oe/technology-development/smart-grid
3. Energy Monitor Save Energy & Lower Electricity Costs AlerMehttp://www.alertme.com
4. Projeto de lei do Senado 84/2012 (in Spainish)http://www.senado.gov.br/atividade/materia/getPDF.asp?t=105231&tp=1