Hydroelectric energy is produced by harnessing the gravitational force of falling or flowing water to turn turbines that generate electricity. It is produced in 150 countries, with China being the largest producer and accounting for around 17% of its domestic electricity. The pros of hydroelectricity include being renewable, low-cost, flexible, clean without CO2 emissions, reliable, and controllable; the cons include requiring large dams that can damage environments and marine life. Hydroelectric plants work by creating reservoirs through dams, channeling water through tunnels to turn turbines and generate electricity.

1. Hydro electric energy
- The production of electrical power
through the use of the gravitational
force of falling or flowing water.

2. • Hydropower is produced in 150 countries.
• The Asia-Pacific region produces 32 percent of global
hydropower as of 2010.
• China is the largest hydroelectricity producer.
– Produces around 17 percent of the domestic electricity use.
– The largest hydroelectric power plant in the world is located
in China on the Yangtze River.

3. • Pros:
– Water is a renewable resource
– The cost is relatively low
– Very flexible source of energy
– Its clean, it doesn’t pollute the environment with any
CO2 emissions.
– Very reliable and dependable source of energy.
– Controllable production
– Quick start, and shut down
– Manageable production

4. • Cons
– Require large areas to build dams.
– Destruction of environment.
– Destruction of marine life.
– Risk and threat for people.
– High initial cost.

5. How does it work?
• Large fast-flowing rivers are the ones that produce the
most hydroelectricity.
• The water must be controlled.
• A large reservoir is created usually by damming a river
or creating an artificial lake.
• From there, water is channeled through a tunnel.
• Water flows through the dams tunnels, which causes
the turbines to turn. The turbines make generators
move.
• The generators are the machines that produce
electricity.