1. Energy Efficiency Department of Energy (DOE) and Renewable Energy.20% of Wind Energy by 2030: Increasing Wind Energy's Contribution to U.S. Electricity Supply.DOE/GO‐102008‐2567. Available athttps://www.energy.gov/eere/wind/20‐wind‐energy‐2030‐increasing‐wind‐energys‐contribution‐us‐electricity‐supply 2008.
2. EWEA position paper.2050: Facilitating 50% Wind Energy ‐ Recommendations on Transmission Infrastructure System Operation and Electricity Market Integration. Technical report EWEA European Wind Energy Association 2009.
3. European Commission.Strategic Energy Technology Plan (Set‐Plan). Available athttp://ec.europa.eu/energy/en/topics/technology‐and‐innovation/strategic‐energy‐technology‐plan(accessed October 02 2018) 2016.
4. Global Wind Energy Council.Global Wind Statistics 2015. Available athttp://www.gwec.net/wp‐content/uploads/vip/GWEC‐PRstats‐2015_LR.pdf(accessed October 02 2018) 2016.