During the last two decades, a relevant development of renewable energy sources for
electricity generation has been observed in Spain. Their diffusion has provoked deep
changes that at times have been controversial. The large penetration of renewables under
the recent economic conditions has affected power plants, triggering changes in the
regulatory framework. In Spain, the use of Combined Cycles Gas Turbines (CCGTs) for
complementing intermittent renewables is meant to ensure the security of supply. This paper …