National Trust has appointed Good Energy as its principal energy partner, which will see in Good Energy providing the trust with financial and practical support in developing renewable energy projects.

The deal is part of National Trust's target to halve its use of fossil fuels by 2020.

As part of the initiative, Good Energy will offer its certified 100% green energy tariff to more than million National Trust members, in addition to supporters and volunteers.

For each National Trust supporter who signs up to the 100% tariff and standard gas, Good Energy will give up to £40 every year to support the National Trust.

Projects are likely to include wood-fired boilers to replace old oil heating systems in National Trust properties, plus sustainable water and solar power installations to generate green electricity.

Patrick Begg, National Trust Rural Enterprise Director, said: "Building a renewable energy future for the special places we look after makes good business as well as environmental sense.

"Investing in renewables helps us reduce our costs which means more of the money we raise can go into vital conservation work. It also means we?re cutting our damaging carbon emissions by burning fewer fossil fuels. This will be vital in helping us do our bit to reduce the impact of changing climate on these special places."