npower has two Green Energy Supply certified tariffs:

Juice is a green source and green fund tariff that matches the amount of electricity you use with a supply of renewable power back into the electricity grid. In 2008-09, 65% of the electricity supplied was from wind farms. The rest came from the Dolgarrog hydro plant in North Wales. The percentage of wind farm electricity varies year-on-year.

npower has also committed to donate £10 per customer each year to the Juice Fund, which invests in wave and tidal technologies.

National Trust Green Energy is a green source and green fund tariff. npower will match 100% of the electricity you use with a supply of renewable power back into the electricity grid. For every customer that signs up to the tariff, the company will contribute up to £30 (£15 for electricity and £15 for gas) to the National Trust Green Energy Fund. For every additional year a customer remains on the tariff, Npower will contribute a further £20 (£15 for electricity and £5 for gas) to the Fund.

The National Trust Green Energy Fund will support investment in micro and small scale renewable energy at National Trust properties such as installing solar photovoltaic, solar hot water and ground source heat pumps.

Customers on the tariff will also receive a Care and Conserve booklet containing energy efficiency advice and tips.

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