SSE customers charged up to £33,000 a day by faulty smart meters

Energy supplier apologises and launches inquiry into errant devices after customers tweet company about soaring bills

Shocked customers of a major energy company have received an apology after malfunctioning smart meters said they would be charged up to 33,000 for one day's power.

SSE, one of the "big six", said it had launched an urgent investigation into the errant devices, one of which told a customer they had exceeded their daily budget by nearly 3m%.