1. See U.S. Department of Energy “Green certificate marketers ” Green Power Network (updated 18 Oct. 2001) (http://www.eren.doe.gov/greenpower/mkt_gcert.html).
2. Energy Information Administration “Annual energy review” (modified Oct. 2001) (http://www.eia.doe.gov/emeu/aer/contents.html).
3. Calculation based on HVDC Power Transmission Technology Assessment Report ORNL/Sub/95-SR893/1 (Oak Ridge National Laboratory Oak Ridge TN April 1997).
4. Hirst E., Interactions of Wind Farms with Bulk-Power Operations and Markets (September 2001)http://www.EHirst.com/PDF/WindIntegration.pdf).
5. Danish Windturbine Manufacters Association “21 Frequently Asked Questions About Wind Energy” (updated 16 April 2001) (http://www.windpower.dk/faqs.htm).