Scottish & Southern Energy could axe up to 900 jobs after being found guilty of mis-selling energy deals on doorsteps.
The utility has said it will suspend all of its doorstep sales activity in Britain after a court found SSE's sales agents had used misleading sales scripts when talking to people on their doorsteps.
"Changes in products, services and processes mean the energy market has matured to a stage where we believe that commission-based doorstep sales is no longer a sustainable way of securing energy customers for the long term," Alistair Phillips-Davies, SSE's generation and supply director said.
Utilities including SSE, Scottish Power, npower and EDF energy are also being investigated for lack of clarity in approaching new customers on the doorstep.
The UK's top six utilities defended their power pricing at a parliamentary committee hearing in May, saying they acted no faster to raise prices than lower them.
SSE said part of the reason it no longer believed commission-based doorstep selling was effective was because the public's confidence in the practice was low.
It added that the process required more customer safeguards and that customers needed more objective information on the energy they buy.