Windmills were also used in Europe during the 10th century. As Australia is so big it is hard to get electricity to all parts. That's why wind power is vitally important to Australians, especially farmers. Wind energy is also very cheap to get. Wind energy is a renewable energy source and the more wind energy used the less burning off of fossil fuels.
Wind power have two side effects though.
Wind generators give off a low frequency sound which shakes objects in near by homes. Also wind generators affect radio and television reception. It is believed by many to be the best alternative energy source for the future. It involves no side effects to the environment. Solar hot water systems work by solar panels absorbing light from the sun which intensifies and heats up water in pipes behind the panel.