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Green Energy
Green energy is defined as electricity derived from renewable or clean resources. This can consist of hydro energy, wind energy, solar energy, geothermal energy and biofuels. However Gas cannot be classed as green energy as it is a non-renewable resource.
The majority of electricity supplied to the UK National Grid is currently produced by burning non-renewable fossil fuels such as coal, natural gas and petroleum, as well as through the generation of nuclear power, derived from the non-renewable resource uranium.

Since April 1st 2004 all UK Energy suppliers have to ensure at least 4.9 percent of all energy they provide comes from renewable energy sources. In order to reach this minimum requirement, large energy suppliers now offer a green tariff to customers. In many cases this does not exceed or match the minimum 4.9% renewable energy that the supplier is required to provide, as demand from traditional tariffs is still considerably greater.
When you are trying to evaluate which tariff is better, its better to look at what these green tariffs are trying to achieve. Ultimately the aim should be to increase the amount of renewable energy supply there is in the UK. By increasing the influence of renewable energy sources, it is possible to lessen the influence of the environmentally degrading sources, Fossil Fuels and Nuclear Power. Its for this reason that purely Energy-based tariffs are the most positive choice.