1. PV Solar Panel Priceshttp://www.pvpanelguide.co.uk/guides/pv-solar-panel-prices/
2. DSIRE: Database of State Incentives for Renewable Energy Tax Credithttp://www.dsireusa.org/incentives/incentive.cfm?Incentive_Code=US37F&re=1&ee=1
3. States Continue to Realize the Benefits of Renewable Energy Standardshttp://www.americanprogress.org/issues/green/news/2013/01/18/50022/states-continue-to-realize-the-benefits-of-renewable-energy-standards/
4. Tracking the Next Industrial Revolution: Electricity Suppliers Look to EVs to Save Their Business Modelshttp://reneweconomy.com.au/2013/electricity-suppliers-look-to-evs-to-save-their-business-models-24550