Sainsbury's Energy is a small supplier formerly in partnership with British Gas, but now in partnership with npower.
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About Sainsbury's Energy
When the Sainsbury's Energy and British Gas partnership came to an end (British Gas had been supplying customers with the energy they used under the Sainsbury's banner), it made sense for Sainsbury's to find a new partner with whom to serve its existing customers and reach new ones. As the brand already had a relationship with npower, it made sense for both parties to formalise that relationship in a business sense.
With a brand new app and the potential for Nectar points to be gained as a result of switching to Sainsbury's Energy, this is a partnership that the two companies hope will bear fruit over the coming months and years.