"In New Zealand, we don't have much a history of doing this sort of thing outside of the mainstream PPPs, but I think it's great that it's now become publicly acceptable to look at a range of sources of finance.
"What we do know is there's plenty of finance around if you've got a transaction that makes sense to people," English said.
"Because it's relatively new I wouldn't raise too many expectations about the next few months, but the indications I've seen suggest there's been an awful learnt by both central and local government."
Legislative change could be required for Auckland Council, which had rigid debt levels although the city's debt was "actually quite low". However, that would not occur before the September 23 election.
Answering questions about New Zealand's capacity to handle current levels of population growth caused, in part, by very high net migration, English appeared to practice attack lines for the forthcoming election campaign, saying he believed the ability to cope with these challenges was "going to be a key issue in the campaign".
"We believe New Zealand can adjust to be a growing economy with a growing population," he said. "Our political opponents think New Zealand isn't up to it, it's too hard and the solution is to shut down the growth by closing off international investment, getting out of international trade, closing down migration and settling for a kind of grey, low-growth mediocrity where the best thinking of the early (19)80s sets our political direction."