In 2011 Sainsburys joined the ever-growing energy market as supplier of gas and electricity, via a partnership with British Gas.
They offer the standard services that all suppliers do but with a real focus on customer service. They also place a strong focus on offering advice to customers relating to how to be more efficient with their energy. They also have an online system on which you can monitor your bill and check your usage easily.
It's important to know where your supplier gets their energy from: