1. AWEA (2008), Top 20 states with wind energy resource potential, American Wind Energy Association. Document available online at: http://www.awea.org/pubs/factsheets/Top_20_States.pdf (accessed September 9, 2008).
2. Network costs and the regulation of wholesale competition in electric power;Baldick;Journal of Regulatory Economics,1993
3. Barradale M.J. (2008), Impact of policy uncertainty on renewable energy investment: wind power and PTC. USAEE Working Paper, The United States Association for Energy Economics, January 2008.
4. CAISO (2008), Monthly Market Performance Report (January–December 2008), California ISO.
5. DOE (2002), Upgrading transmission capacity for wholesale electric power trade, Energy Information Administration, Department of Energy. Document available online at: http://www.eia.doe.gov/cneaf/pubs_html/feat_trans_capacity/w_sale.html (accessed July 13, 2007).