The given pictures depict the structure of a hydroelectric dam and the process of electricity production.
Overall, the hydroelectric dam consists of three major components, including a couple of reservoirs in different elevations and a power station. There are two main stages of electricity generation based on its different mechanisms in daytime and nighttime.
Regarding the structural layout, the dam comprises an upper water container at higher altitude and a lower-level one. The two reservoirs are connected by a penstock, where channels intake water directly to the powerhouse. Inside the generating house, there is a generator linked with a reversible turbine, acting as a generating operator in daytime and a pump in nighttime. Additionally, the generator is also connected to a network of long-distance power lines for electricity transmission.
Turning to the operation, there is a continuous cycle including two main stages. During day hours, after an intake is opened, water restored in the higher container is directed to the turbine leading to the generating room, where the manufacturing process happens. While he produced electricity goes through the high-voltaged power lines to different places, adapting to desired usages, the water is led to the lower-level reservoir, waiting for the next stage. When the night comes, after the intake is closed, the available liquid is pumped back to the former container by the turbines until the reservoir is filled.