Coronation Street fans sparked a massive power surge across Britain as they made cups of tea at the end of a nail-biting double bill.
A surge measuring 1,200 mega-watts was recorded after viewers saw serial killer Richard Hillman, played by Brian Capron, admit he was a murderer.
At the end of last night’s second episode of the ITV1 soap, the power surge was equivalent to around 450,000 kettles being switched on, a National Grid spokesman said.
He said the surge reflected the number of viewers who resumed normal activities including making cups of tea and switching lights on.
Viewing figures were not being announced until later today.
In last night’s double bill, Gail, played by Helen Worth, discovered the terrible truth – that the husband she loves is a murderer.
And as he pinned her to the sofa with his hand over his mouth and his evil face inches from hers, she realised that she could become victim number four.
Richard’s confession came after Gail discovered that murder suspect Ade Critchley, the teenager whom Richard framed for Maxine Peacock’s killing, could not have committed the crime.
A chain of events led Gail to confront Richard – who finally confessed to Maxine’s murder.
To her horror, her husband went on to admit all his crimes one by one.
The double bill was the nailbiting climax of a storyline which has had millions of viewers glued to their TV sets.
In an earlier double bill in which Maxine was murdered, a power surge measuring 1,500 mega-watts swept the nation.
Meanwhile TV watchdogs yesterday rejected dozens of complaints by viewers over that episode last month in which Hillman first attacked pensioner Emily Bishop then bludgeoned Maxine to death after she stumbled in on his crime.
Afterwards, distraught husband Ashley cradled Maxine’s body in his arms and was left drenched in blood.
The Independent Television Commission received 41 complaints from people who believed the scenes were too upsetting for family viewing.
But the complaints were rejected by the ITC, which said viewers knew what to expect because the episodes were preceded by a warning and the storyline had received widespread publicity beforehand.
A spokeswoman said: “The ITC believed this gave parents a good indication of what to expect and so make an informed decision of whether to watch with their children.”
The ITC ruled that the soap had shown “suitable restraint” in the episodes - Hillman was not seen hitting his victims and shots of Emily’s injuries were not graphic.