The end of Europe's love affair with nuclear energy provides fertile ground for the development of other renewable sources of power, according to the head of European infrastructure at private equity house Kohlberg Kravis Roberts (KKR), which has just completed a major deal in the sector.

"Renewables have always been on the agenda of the European governments… Now with the question mark on the future of nuclear, I think that more than ever it's going to be a relevant contribution to the energy mix," Jesus Olmos told CNBC.com in an interview.