Energy Star is an international scheme that awards products with an Energy Star label if they meet set energy-efficiency standards.
First created by the US government in 1992, it has since been adopted by Australia, Canada, Japan, New Zealand, Taiwan and the European Union.
The standard applies to a wide range of products, including computers, white goods and electrical appliance, and has also been extended to cover buildings.
The requirements for the standard are updated regularly and aim to ensure that only the most efficient products in a given category can carry the label.
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