Compañía Española de Petróleos, S.A.U. and Sonatrach SPA agreed to acquire an additional 32% stake in Medgaz, S.A. from Endesa Generacion, S.a. and Iberdrola Generación, S.a.u. for approximately €230 million on February 11, 2013. Compañía Española de Petróleos and Sonatrach will acquire 12% stake in the transaction from Endesa Generacion for €87.5 million, which includes the amount of the loan with Endesa by Medgaz, subject to adjustments. Compañía Española de Petróleos will acquire 15.04% stake while Sonatrach SPA will acquire 16.96% stake in the transaction. The transaction is expected to be completed after receiving authorisation for the replacement of guarantees associated with the financing of Medgaz' development. The deal is expected to be completed by first half of 2013.

As of June 21, 2013, Compañía Española de Petróleos, S.A.U. completed the acquisition of 9.4% stake in Medgaz, S.A. from Iberdrola Generación, S.a.u. for €67.6 million. Santander Central Hispano Investment SA acted as financial advisor to Endesa, BNP Paribas and Morgan Stanley acted as financial advisor to Iberdrola. Citi acted as financial advisor and Fernando de las Cuevas, Iñigo Igartua, Evelyne Ameye and Luis Gil of Gómez-Acebo & Pombo acted as legal advisors to Sonatrach SPA. Cuatrecasas, Gonçalves Pereira, S.L.P. acted as legal advisor to Medgaz.