Mr Key made his announcement to a lunch of 600 hosted by the Wellington Employers Chamber of Commerce.
He said the preferred bidder for Transmission Gully would be announced early next year.
Mr Key said nine days from now marked five years since his Government was elected in 2008.
He said that as well as facing the worst global financial crisis since the Great Depression, Government spending was out of control, having increased by 50 per cent over five year.
"The turnaround in the Government's books has been nothing short of remarkable."
About 65,000 net new jobs had been created in the past two years and the unemployment rate was expected to drop as the economy gathered pace.
He cited a number of polices that had encouraged jobs and growth including resource management law reform, water storage, electricity transmission, oil and gas exploration,
primary growth R and D partnerships and Roads of National Significance.
He said the Government was also encouraging key commercial projects in regions to helplift growth such as the irrigation in the Hawkes Bay, and oil and gas exploration, in Northland it was Treaty of Waitangi settlements, land productivity and the Puhoi to Wellsford highway and the roll-out of ultrafast broadband and rural broadband.
"The Opposition is talking the regions down at the moment," he said "but that is just politics."
The policies they were promoting would damage regional economies, he said.
"A recipe of more taxes, nationally-equalised pay rates no matter where you live, a rollback of employment law reform, higher ACC rates and a reversal of RMA reforms would severely damage growth."