Internet New Zealand chief executive Jordan Carter says nothing will stop the introduction of cheaper broadband prices in a year.
Chorus is taking the Commerce Commission to the High Court over its copper broadband pricing review.
It will file an appeal to determine whether the Commission applied the law correctly when it ruled Chorus must slash by half the price it charges for broadband over its copper wire network.
Chorus claims the ruling will cost it $1 billion in profits by 2020.
Mr Carter told Morning Report he believes the appeal will be unsuccessful.
He said Chorus has a very narrow case and he believes the Commerce Commission interpreted the law correctly.
Mr Carter also said cheaper prices should not affect the ability of Chorus to roll out ultra fast broadband.