Interdiocesan Fuel Management Ltd have joined with Churchmarketplace to provide renewable energy to 16 of the 23 Catholic diocese in England and Wales, which equates to 3200 parishes.
The link comes after a tax exemption on renewable energy bills was scrapped six months ago, leading to bigger bills for people using green energy.
Bulk-buying renewable energy as one entity lowers the premium from £49 per meter per year to £5 per meter per year.
Which diocese are covered by the new partnership?
Arundel and Brighton
Carol Lawrence, director of Interdiocesan Fuel Management Ltd, said: "This agreement is great news for Catholic parishes throughout England and Wales.
"Both IFM and CMP have been for a long time deeply committed to helping parishes to have access to affordable renewable energy.
"Our new partnership helps to advance that objective in harmony with the teaching of Pope Francis on the care for the environment.
"It is a real breakthrough and it puts us in a strong position to expand these highly valuable services to other Catholic institutions."