Ngai Tahu is seeking answers over its involvement in a controversial Hawke's Bay dam project now that one of the major investors has pulled out.
Trustpower Limited has walked away from the venture because it says it's too risky and it's not happy with the returns it might receive.
Trustpower and Ngai Tahu's commercial arm committed their intention to the project last year by signing a memorandum of understanding with the Hawke's Bay Regional Council's investment company.
Ngai Tahu Holdings chief executive Mike Sang says the Ruataniwha water storage scheme has a number of elements that are key to its success.
Mr Sang says it's currently working with the council and other parties about some matters including the commercial criteria, and participation will be dependent on resolving issues.
The council says it is looking for alternative investors in the project.
