1. GE Energy: ‘Western wind and solar integration study’. National Renewable Energy Laboratory Tech. Rep. SR‐550‐47434 NREL 2010. Available athttp://www.nrel.gov/docs/fy10osti/47434.pdf
2. Lew D. Brinkman G. Ibanez E. et al: ‘The western wind and solar integration study phase 2’ NREL 2013. Available athttp://www.nrel.gov/docs/fy13osti/55588.pdf
3. Enernex: ‘Eastern wind integration and transmission study’ Tech. Rep. SR‐5500‐47078’ (NREL 2011). Available athttp://www.nrel.gov/docs/fy11osti/47078.pdf
4. New England Independent System Operator: ‘New England wind integration study’ (ISONE 2010). Available athttp://www.isone.com/committees/comm_wkgrps/prtcpnts_comm/pac/reports/2010/newis_report.pdf
5. California Independent System Operator: ‘Integration of renewable resources: operational requirements and generation fleet capability at 20% RPS’ (CAISO 2011)