Total GDP rose to $12.29 billion for the 2015 financial year, up from $12.02 billion a year earlier and $11.37 billion in 2013.
Mr Gregec said Bay businesses fought through the couple of years where the outlook wasn't so rosy.
"We had a period where things were looking a lot more pessimistic, where we had the Rena crisis and the kiwifruit impact - that's all behind us now, and people are in a growing, positive mindset."
Mr Gregec said migration from Auckland was high and he expected this to continue.
"We have good activity across most local sectors - horticulture, manufacturing, building, healthcare, export, and even retail - with the only noticeable dips occurring in dairy. Other than that, it's pumping," he said.
"There is of course another side to the coin, which is that roading and residential infrastructure is being pushed, schools and social services are under strain, and we have challenges to create and maintain the type of vibrant community and cultural heart that more established cities might take for granted."
Nationwide, 11 of 15 regional economies grew in the 2015 financial year.
Auckland and Canterbury had the largest GDP increases in the country, at $5.7 billion (6.9 per cent) and $2.3 billion (7.3 per cent) respectively.