It wants more work done prior to the election on possibly "unbundling" the port's total freight task to other ports ahead of investigating billion-dollar relocation sites.
"Auckland will, in all likelihood, always require a port facility," said Northport chairman John Goulter. "But there are opportunities for the load to be shared across the upper North Island and these have not yet been explored fully."
The report overlooked expanding capacity in the next decade at Northport where log exports are expected to fall significantly as key Northland forests are harvested and its container handling ability is being developed with consented plans more than doubling berth length.
Goulter said the greater Marsden Point area was particularly suited to port expansion with 180ha of undeveloped commercial-zoned land adjacent to the port boundary.
While much of the discussion about Ports of Auckland's future is about how its neighbours and stakeholders don't want it to grow any further, the people of Northland would welcome more cargo coming to their region, Goulter said.
He said that fact wasn't lost on the port study group chairman Rick Boven, who recently said "no one wants a port in their backyard, except possibly Northport".