Sainsbury’s Energy is a trading name used under licence by PS Energy UK Limited, (Registered No. 09850654) registered in England & Wales. Registered Office: Windmill Hill Business Park, Whitehall Way, Swindon, Wiltshire, SN5 6PB. PS Energy is a wholly owned subsidiary of Npower Limited (Registered No. 3653277) Registered Office: Windmill Hill Business Park, Whitehall Way, Wiltshire, Swindon, SN5 6PB.