The Maori Party is questioning the government's commitment to "good faith" consultation with iwi over water rights.
Finance Minister Bill English is holding a series of hui with iwi to explain the government position on the partial privatisation of state-owned energy companies, and the Waitangi Tribunal's suggestion that Maori could be given shares carrying powers "above and beyond" those of other shareholders.
The government says the "shares plus" concept wouldn't work but it wants to hear whether iwi have any new ideas on it.
The first hui in Hamilton on Tuesday night attracted only 15 iwi members but on Wednesday morning about 100 Ngati Tuwharetoa and Te Arawa representatives turned up in Taupo.
About 80 Whanganui iwi members were reported to have attended Wednesday night's hui in Whanganui.
Mr English has three more to go.
The government delayed the Mighty River Power share sale until March next year so iwi could be consulted, but Maori Party MP Te Ururoa Flavell says he and his colleagues have serious concerns about the way the government is approaching the discussions.
"They tell our hapu and iwi that they intend to consult in good faith and yet their actions don't reflect this," he said.
"The Crown has deliberately gone into these hui with a pre-determined outcome."
Mr Flavell questioned Treaty Negotiations Minister Chris Finlayson in parliament about the government's attitude, and was told it had a "preliminary position" on shares plus.
Ministers insist they are willing to listen to any suggestions from iwi.