The picture illustrates the process of electricity generation in a hydroelectric power station.
In general, water is collected from a river to the dam, then the current of water will be generated to produce electricity.
To begin, electricity production in the hydroelectric power station starts with water from a river being accumulated in the dam which open at the day to intake the current of water to the generating station. Subsequently, the generator will operate as the current of water turns the turbine, followed by the production of electricity.
Afterwards, the electricity is delivered to power lines and to national grid to provide electricity to people around nation. When at night, the turbines of generator pump water into high-lever reservoir so the water come out from the generating station and the dam. After it comes out from the dam, the dam is closed and will be opened at day on the next morning. 
The picture illustrates the process of  
electricity
 generation in a hydroelectric power station. 
In general
,  
water
  is collected
 from a river to the  
dam
, then the  
current
 of  
water
 will  
be generated
 to produce electricity.
To  
begin
,  
electricity
 production in the hydroelectric power station  
starts
 with  
water
 from a river  
being accumulated
 in the  
dam
 which open at the day to intake the  
current
 of  
water
 to the generating station.  
Subsequently
, the generator will operate as the  
current
 of  
water
 turns the turbine, followed by the production of electricity.
Afterwards, the  
electricity
  is delivered
 to power lines and to national grid to provide  
electricity
 to  
people
 around nation. When at night, the turbines of generator pump  
water
 into high-lever reservoir  
so
 the  
water
  come
 out from the generating station and the  
dam
. After it  
comes
 out from the  
dam
, the  
dam
  is closed
 and will  
be opened
 at day on the  
next
 morning.