Spanish oil company Repsol said on Friday it would buy renewable energy company Asterion Energies for 560 million euros ($596 million). The deal is one of the largest renewable energy deals in Spain in terms of megawatts. Asterion's portfolio includes 4.900 GW of photovoltaic solar and 2.8 GW of wind, of which 2.5 GW is at an advanced stage of development or under construction.