The pictures illustrate the process of hydroelectric power station, to generate electricity from the river to national grid in 4 steps. 
The pictures illustrate the process of hydroelectric power station, to generate electricity from the river to national grid in 4 steps. 73adk
The pictures illustrate the process of hydroelectric power station, to generate electricity from the river to national grid in 4 steps.
In general, in the first stage, water from the river dammed into a high level reservoir, after several processes, electricity is produced.
To begin, electricity production starts with the water that is dammed from the river to make a high level reservoir, so the water can flowed into the generator through the pipe that being opened by day. Subsequently, the water moved the generator by reversible turbines during the day, and the the water flows into low level reservoir. After the turbines stirred by the water, it operates the generator to produce electricity and distributed by power lines into national grid.
Once the day is over, in the night, water flowed back from low level reservoir to spin the turbines in order to pump water into high level reservoir. 
The pictures illustrate the process of hydroelectric power station, to generate  
electricity
 from the river to national grid in 4 steps. 
In general
, in the  
first
 stage,  
water
 from the river dammed into a high  
level
  reservoir
, after several processes,  
electricity
  is produced
.
To  
begin
,  
electricity
 production  
starts
 with the  
water
 that  
is dammed
 from the river to  
make
 a high  
level
  reservoir
,  
so
 the  
water
 can flowed into the generator through the pipe that  
being opened
 by day.  
Subsequently
, the  
water
  moved
 the generator by reversible turbines during the day, and  
the the
  water
 flows into low  
level
  reservoir
. After the turbines stirred by the  
water
, it operates the generator to produce  
electricity
 and distributed by power lines into national grid.
Once the day is over, in the night,  
water
 flowed back from low  
level
  reservoir
 to spin the turbines in order to pump  
water
 into high  
level
  reservoir
.