The design of the Regional Electricity Market (MER) was done in 1997 and approved in 2000. MER is an additional market superimposed on the existing six national markets, with a regional regulation, in which the agents authorized by the Regional Operational Body (EOR) carry out international electricity transactions in the region. As for the infrastructure, EPR (Empresa Propietaria de la Red S.A.) is in charge of the design, engineering, and construction of about 1,800 km of 230kV transmission lines. The project is expected to be operational by the end of 2011.
