Gas and electricity Updated:
The company said that it had taken the decision as it understood that the majority of customers do not want to be sold energy on their doorstep via unsolicited calls.
British Gas and Scottish and Southern Energy have already pledged to suspend doorstep sales.
Consumer Focus, which has called for a blanket three month suspension of all energy doorstep sales, said the announcement has heaped pressure on npower, E.ON and Scottish Power to 'behave responsibly' and follow suit.
It said that Scottish Power has refused to end the practice, while npower and E.ON are yet to commit to a suspension.
"Energy firms have failed to deliver a solution on doorstep sales for their customers despite well-intentioned commitments over the last decade," said Audrey Gallagher, director of energy at Consumer Focus.
"Continued cold call sales by the remaining big suppliers could further damage consumers.
"We would urge all consumers to think twice before they buy on the doorstep, shop around for the best deal, and take time to think things over before making a final decision."
The group has urged energy regulator Ofgem to force suppliers to stop doorstep selling and consider an outright ban.
It is also asking that customers be clearly directed to independent advice by suppliers ahead of any home sales visits, and that consumers be informed if cheaper deals are available.
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