Britain's biggest energy supplier has offered more than 150,000 of its customers half-price power on Sunday.The trial, launched by British Gas, is designed to encourage consumers to switch to using energy at off-peak times when national demand is low.The company said it would refund 50 per cent of the unit rate for any electricity the customers used between 11am and 4pm, and will monitor whether the incentive of cheaper energy is enough to make families rethink their habits.
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