In December 2009, Colinversiones, through its subsidiary Colener S.A.S acquires 47.3% of Pacific Power company S.A., EPSA, after making a public acquisition offer (OPA).
EPSA, located in Yumbo (Valle del Cauca), is the fifth largest electricity generator in the country with a capacity of 1,068 MW as follows: 914 MW in nine hydroelectric plants (Alto Anchicayá, Bajo Anchicayá, Salvajina, Calima, Hidroprado and four smaller plants); 140 MW in a PPA (Power Purchase Agreement) held with Termovalle until 2018, and 14 MW available in three plants of CETSA S.A. E.S.P., of which EPSA owns 87.54% (Riofrío I, II and The Rumor Riofrio). In distribution and commercialization, EPSA serves 39 municipalities of Valle del Cauca, where has more than 480,000 customers, including residential, commercial and industrial users; also has 273.2 km of transmission lines of 230 KV.
In late December 2009, a merger was perfected by absorsion among Colivenrsiones S.A. E.S.P. (Celsia today, and acquiring company), Generar S.A E.S.P., Meriléctrica S.A., Meriléctrica S.A. & Co.. S.C.A. E.S.P., Compañía Colombiana de Energía S.A.S. and Hidromontañitas S.A. E.S.P. (acquired companies), in order to improve work processes and the corporate structure.