The hydro-electric mini-plant of Ribeira da Praia has been developed to replace three old hydro-electric installations situated downstream in the part of the river that is short-circuited by the new installation. This project is characterized by the following innovations : - Penstock in cast iron which is particularly well adapted to the rough volcanic terrain and the seismic region. - Double Pelton turbine arrangement allowing a more compact installation with ease of use and maintenance. - Tele-surveillance, permitting the transmission of principal information to a PC (centrally installed HQ of "EDA") as well as the remote control of the installation.