1. Renewable electricity and the grid – the challenge of variability,2007
2. Wind energy in electricity markets with high wind penetration;Usaola,2009
3. Hulle FV, Fichaux N, Sinner AF, Morthorst PE, Munksgaard J, Ray S, et al. Powering Europe: wind energy and the electricity grid. Tech. rep., EWEA – European Wind Energy Association; 2010.
4. The market value of variable renewables. The effect of solar wind power variability on their relative price;Hirth;Energy Econ,2013
5. Considerations on the backup of wind power: operational backup;Luickx;Appl Energy,2008