"New Zealand Transport Agency has done a lot of work around savings through clusters of councils maintaining their road services together. My gut feeling is that through injecting a higher level of professional services and well qualified engineers, there is potential savings to come directly as a result of those changes."
Mr Winder's report said there would be minimal benefit to ratepayers in terms of savings as a result of a merger. Setting new rate increases across the region would be difficult. The Auckland model showed there had been "winners and losers".
"It would be easy for any savings to get lost in rate increases."
Mr Winder was asked whether shared services among the councils could generate the same level of savings as amalgamation.
"You would struggle to get the same level but shared services is the single biggest option for savings, short of amalgamation."
He had met the chief executives or chief financial officers of the Wairoa, Napier, Hastings, CHB and regional councils as part of his study but found it difficult to gain a consensus on some issues.
"It was a challenging workshop because there were different perspectives in the room, relating to potential savings and how it could be achieved.
"There were a large number of areas where we got a common view but on others it was difficult."
A Better Hawke's Bay chairwoman Rebecca Turner said the report confirmed the annual savings of $10 million and the costs would be recovered inside the first two years of a new council operating.
"The ongoing compound benefit of $10 million annually will be immense for our region."