Although the Commerce Commission is responsible for setting Transpower's total regulated revenue requirements, the authority is responsible for approving the method by which Transpower shares the income among its transmission customers.
Of the 89 submissions the authority received, 13 were from Northland.
Lines' companies Top Energy and Northpower, Refining NZ, and Northland MP Winston Peters were among those who made submissions.
The Tai Tokerau Northland Economic Action Plan Advisory Group said of particular concern was the authority's proposal to retrospectively recover costs from large investments by Transpower outside of Northland which would be poor regulatory practice.
Refining NZ chief executive Sjoerd Post said the authority's proposal was at odds with the Government's push to incentivise people to move to regional New Zealand.
Whangarei resident Ross Clark said the authority's proposal paper was a "confusing maze of corporate-controlled, jargon-described" arrangements beyond the easy comprehension of the public.
"Electricity is a national asset for all NZ and pricing should be fair and equitable to all regardless of location."
The authority is expected to make a final decision by mid-2016. If approved, the earliest any transmission price changes would apply is from April 2019.