Chorus sought the more fulsome review for network pricing after claiming the original decision would force it to cut prices too steeply and put its investment in building a nationwide fibre network at risk.
Read the full Commerce Commission decision here:
See a Commerce Commission infographic explaining today's decision here:
The commission today said it wasn't "worthwhile for end-users to pay a premium" to mitigate the risks of migrating customers to fibre products "given the benefits are far less certain than for the energy sector where we raised the allowed return on capital."
The regulator today said it proposes not to backdate the wholesale pricing in a split decision, where commissioner Pat Duignan was of the view that retail service providers such as Spark New Zealand should compensate Chorus for the difference in price between the new start date and December 1, 2014.
Gale said he and commissioner Elisabeth Welson didn't think backdating would promote competition for the long-term benefit of consumers, though are still seeking submissions on the issue.
Chorus said the impact of the draft decision was largely in line with the previous ruling, though a move to reduce one-off transaction charges could require the company to provide those services below cost.
The company also opposed the proposal not to backdate pricing, saying it was a "significant reversal" on the regulator's previous position.
Chorus shares last traded at $3, and have climbed 13 percent this year.
The regulator is seeking submissions on the draft determination which are due by August 13, and is aiming for a final ruling in December this year.
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See a Chorus announcement to the stock exchange on the decision here: