The cash will go towards setting up a Green Investment Bank that should help homeowners make the switch to eco-friendly power.
Mr Barwise states: "The Green Investment Bank offers the opportunity to develop a renewable manufacturing base to develop our own fuels and markets, and also to other initiatives that will support our green economy."
Climate secretary Chris Huhne recently suggested the plan may have to be scaled back, despite being one of chancellor George Osborne's big environmental promises.
Posted by Jim Tidy
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