The two companies responsible for design and planning of the Ruataniwha water storage scheme are likely to be selected by Hawke's Bay Regional Council at the end of this month.
The council's investment company is leading the project and although it does not have a resource consent, it said it was necessary to line up companies interested in the dam's construction.
The investment company will also spend the next five months locking down commitment from farmers who are interested in using the water supply from the dam. It was also developing a package for farmers to potentially invest in the scheme.
More field days will be held for farmers considering being part of the scheme and each one has a focus, such as arable farming, beef, sheep and dairy.
The investment company and BNZ Advisory are considering a "Build, Operate, Own and Transfer" (BOOT) approach to encourage investors. Under this plan, investors would buy into the scheme and receive set returns for an agreed number of years, between 35 to 70 years, after which the scheme would be transferred back to regional council, and public, ownership.