More and more households are looking to alternative power or renewable energy as a constant source of electricity in a bid to cut down on costly monthly bills or decrease greenhouse emissions in the environment. Coal-driven energy has not only had a noticeable effect on the environment, but has also seen the decline of the world's natural resources, prompting "green" nations and businesses to promote renewable sources of power. One such group is Sustainable Energy Africa, a non-governmental organisation which endorses and researches sustainable energy resources in developing African communities. What they have done is build an energy efficient (or eco) house that runs completely on alternative energy sources, like solar and hydro power.