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2. EnerNex Corporation Eastern Wind Integration and Transmission Study (EWITS) (Revised) 2011 242 http://www.nrel.gov/docs/fy11osti/47078.pdf
3. Australian Energy Market Operator 2011 National Transmission Network Development Plan, Australian Energy Market Operator 2011 http://www.aemo.com.au/Reports-and-Documents/DevelopmentPlans/~/media/Files/Other/planning/ntndp/NTNDP2011_CD/documents/NTNDP_2011%20pdf.ashx
4. Grid integration of wind farms;Tande;Wind Energy,2003
5. Ela E Kirby B ERCOT Event on February 26, 2008: lessons learned, national renewable energy laboratory 1617 Cole Blvd 2008 http://www.nrel.gov/docs/fy08osti/43373.pdf