TPF ENGENHARIA (former Projetec) was one of the companies responsible for carrying out the EIA/RIMA (Environmental Impact Study/Report) and the hydroelectric use of the rivers Ribeiro Gonçalves, Uruçuí, Cachoeira, Estreito and Castelhano, all in accordance with the reference terms presented by IBAMA.

All these hydro-electric undertakings, located in the basin of the Parnaiba river, between the states of Piauí and Maranhão, are included in the PAC (Growth Acceleration Pact).