The two Argentine provinces are looking to address under capacity on their transmission grids as demand for energy grows.
The country's first ultra-high tension laboratory has been opened in Rio de Janeiro.
The tender will trade electricity commercialization contracts with a 30-year supply term for hydropower and 20 years for biomass, wind and solar projects.
Proyectos México aims to increase competition in tenders for public works and energy infrastructure through PPPs.
The announcement came as the ruling socialist party won 300 of 335 mayoral offices after three of the four main opposition groups refused to participate.