1. Global Statisticshttp://www.gwec.net/global-figures/wind-energy-global-status/
2. Photovoltaics Report,2015
3. Irradiation Data for every place on Earthhttp://www.meteonorm.com/
4. Reliable Efficient Assessment of Solar Energy Systemshttp://geomodelsolar.eu/
5. Solar Time Serieshttp://www.vaisala.com/en/energy/Renewable-Energy-Consulting-Services/Solar-Energy-Assessment-Services/Pages/Solar-Time-Series.aspx