The energy regulator has agreed to investigate the practices of energy suppliers following widespread concern about prices and standard of service.
Ofgem says has held a meeting with isles politicians.
It follows a demand for action after Shetland’s MP and MSP received a bulging inbox of complaints.
Beatrice Wishart and Alistair Carmichael say they have secured a commitment that Ofgem will look into poor practices.
But Ms Wishart said further action was needed.
“Agreeing to this action cannot be a token gesture. We need to see a serious probe into unfair practices affecting people in the Shetland.”
Mr Carmichael said the meeting was a “step in the right direction”.
“This may not be the end of poor behaviour by energy companies but I am hopeful that we will see a more hands-on approach from Ofgem as we move forward.”
Ofgem said its rules required energy suppliers to treat all customers fairly.