The growth in freight and the critical role of the ports in the regional and national economy are the key reasons given by Ports of Auckland for expanding its operations into the Waitemata Harbour.
The port company has strongly lobbied its case and last December urged Auckland councillors to "lock in place" a coastal zone allowing it to expand its waterfront operations from 77ha to 95ha by 2055.
In a submission on the draft Auckland Plan on December 19, infrastructure general manager Ben Chrystall said the ports handled $26.5 billion of trade annually, 36 per cent of New Zealand's container trade by volume and 31 per cent of New Zealand trade by value.
The port company, he said, facilitated 22 per cent of the Auckland economy and sustained 187,000 jobs. This was expected to grow to 628,000 jobs by 2031.
Over the past 20 years, container volume growth has averaged 6.74 per cent.