 Some of the structures along this reservoir include the Eastmain-1 power house and the Eastmain-1-A power house, which are under construction.Eastmain-1 has three water turbines that can collectively generate as much as 480 megawatt hours of electricity, according to the EM-1 Project plan.Meanwhile, HydroQuébec explains that Eastmain-1-A is intended to supplement its slightly older neighbor.