SIEPAC is owned by a Regional Operations Entity (Empresa Proprietaria de la Red - EPR), created in 1999 with registration in Panama, and comprising the public utilities and transmission companies of the six participating countries (75%) and private capital (25%). In some countries integrated utilities are shareholders - ENEE of Honduras, ICE and CNFL of Costa Rica - while in others shares are held by transmission companies - INDE of Guatemala, ETESA of Panama, and ENTE of Nicaragua. In the case of El Salvador the utility CEL and the transmission company ETESAL own the shares jointly. The private shareholders are Endesa of Spain and ISA from Colombia.