Hydropower is a renewable source of energy which uses the force or energy of moving water to generate power.

This renewable source of energy has been used since ancient times. The Romans and t he Chinese used watermills and the power of water to operate many different mechanical devices such as cranes, lifts, mining devices, sawmills, textile mills or corn mills.

How hydro - electricity works

To make hydro-electric power, water from rain or melting snow is collected and stored in a lake or a dam. A large pipe carries the water from the dam or lake to the turbine.

The energy of rushing water is changed into electric energy inside the hydro power plant Getty Images

The energy of rushing water is changed into electric energy inside the hydro power plant Getty Images

The flow of the water from the dam can be controlled by opening and closing gates or pipes to the dam. The dam wall also creates a high water level and this increases the pressure in the pipes which takes the water to the turbine. Water flows from the dam down the penstock.

The pressure of the water pushes against the blades of the turbines and make them spin.

The rotating turbines are connected to a generator which makes the electrical energy or electricity. The electricity then travels through transformers and transmission lines to homes and factories.

Hydro-electricity is a renewable source of energy.

Hydro produces 58 per cent of the renewable electricity produced in Australia. 
All the water used to make hydro-electricity is returned to the river after use.
Hydro-electricity is clean power. It produces no waste, and doesn't produce any greenhouse gases.

The most famous hydro-electric power station in Australia is the Snowy Mountains Hydro-Electric Scheme.

Read about it here.

http://www.snowyhydro.com.au/?s=history&x=0&y=0

Here's a video about hydro-electric power