The 6,000 sq ft Kington store at Crabtree Road, which supports around 30 jobs, runs on 100 per cent renewable electricity.
The Co-op also donates money to community causes including Kington Town FC Youth Team; Kington Bowling Club and the Radnor Valley recreation and amenity centre.
Store manager Simon Clarke said: “The store has a great new look – we have had a fantastic response. It has been a fantastic opportunity to carry out such a significant programme of works to enhance and improve our store for the Kington community.
"We have enjoyed welcoming customers into their new-look store now that the extensive works have concluded. We have worked to develop the range, choice, products and services locally that will create a really compelling offer in our community."