The provided image illustrates the generation of electricity in a sophisticated hydroelectric power station.
Overall, the water flows from a high level to a low-level reservoir and in between a power station is set up which generates the electricity.
The day operation initiates when the water from the river splashes to the constructed dam, which also acts as a barrier, then the water takes the route from the bottom of that dam. Further, the strong flow of water rotates the turbine in the power station. As the turbines move at a fast pace, the generator converts that energy into electricity through the automated process. The water from the turbine is released to the low-level reservoir. Lastly, the electricity is passed to the national grid with the help of power lines.
Similarly, the power station operates at the night by reversing the day process. The pressure at low-level reservoir forces water to move back to the turbine section. Primarily, the turbine rotates in opposite direction thus injecting the water back to the upper-level reservoir. As the flow of water at night is towards the dam from the station, therefore, the whole process of power generation is reinitiated. 
The provided image illustrates the generation of electricity in a sophisticated hydroelectric  
power
 station. 
Overall
, the  
water
 flows from a high level to a low-level  
reservoir
 and in between a  
power
  station
  is set
 up which generates the electricity.
The day operation initiates when the  
water
 from the river splashes to the constructed dam, which  
also
 acts as a barrier, then the  
water
 takes the route from the bottom of that dam.  
Further
, the strong flow of  
water
 rotates the  
turbine
 in the  
power
  station
. As the  
turbines
  move
 at a  
fast
 pace, the generator converts that energy into electricity through the automated process. The  
water
 from the  
turbine
  is released
 to the low-level  
reservoir
.  
Lastly
, the electricity  
is passed
 to the national grid with the  
help
 of  
power
 lines. 
Similarly
, the  
power
  station
 operates at the night by reversing the day process. The pressure at low-level  
reservoir
 forces  
water
 to  
move
 back to the  
turbine
 section.  
Primarily
, the  
turbine
 rotates in opposite direction  
thus
 injecting the  
water
 back to the upper-level  
reservoir
. As the flow of  
water
 at night is towards the dam from the  
station
,  
therefore
, the whole process of  
power
 generation is  
reinitiated
.