British Gas is to offer free electricity for eight hours at weekends to two million customers who have smart meters installed.
Customers will be able to choose whether to take advantage of the deal between 9am and 5pm on a Saturday or a Sunday. British Gas said consumers should see savings of about £60 a year.
But experts said it will not necessarily be the cheapest deal on the market, and advised people to shop around with other suppliers.
Most of British Gas’s 11 million customers will not be eligible, as only 2.4 million of these have smart meters.
