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- US EIA. 2007. Annual Energy Outlook. Washington, DC. http://www.eia.doe.gov/oiaf/aeo/index.html
- NREL. June 2008. Power System Modeling of 20% Wind-Generated Electricity by 2030. Hand et al. Conference Paper http://www.nrel.gov/docs/fy08osti/42794.pdf
- ERCOT. April 2008. Competitive Renewable Energy Zones (CREZ) Transmission Optimization Study, Austin, TX. http://www.ercot.com/
- Utility Wind Integration Group. 2006. State of the Art Wind Integration. Reston, VA http://www.uwig.org/UWIGIntSummary.pdf