The hearings follow a claim by the Maori Council and 11 others that the sales breach the Treaty and a more general claim that the Crown has denied or violated rights over freshwater and geothermal resources.
Mr Ryall told the Weekend Herald the Mixed Ownership Model Bill would be back from select committee by July 16 and passed soon after that.
It needed to be passed no later than August to enable the first partial float, of Mighty River Power, to be conducted in the third quarter of the year, as set out in the sales timetable.
"We're not considering delaying progress on the bill," he said. "We have a timeline we have to stick to."
Mr Ryall said any decisions from the tribunal would not affect the legislation but could affect government actions after the law was passed.
"We don't think the sales affect Maori rights and interests and we think that is supported by current case law."
He cited the Ika Whenua case in the 1990s when the Government planned to transfer dams to several energy companies and the Court of Appeal declined an application to stop that transfer, saying Maori rights would not be diminished by it.
The Government would be putting that position very strongly in the tribunal hearings, Mr Ryall said.
He said the history of the Government had been to address such issues on an iwi-by-iwi basis rather than a pan Maori basis.