The government and the Greens have agreed to work together in the same way they did before the election.
A new memorandum of understanding will be signed and they will collaborate on environmental issues.
Co-leaders Russel Norman and Metiria Turei announced the agreement after meeting Prime Minister John Key on Tuesday.
Dr Norman says existing joint projects including home insulation and toxic site clean-ups will continue.
"We've agreed to look at new projects in the new year," he told reporters.
"We will both look for common ground, we've set up the framework for that and we're not going to rush into anything."
There's been speculation the Greens might agree to abstain on confidence votes rather than oppose the government but Ms Turei said that was highly unlikely.
"We haven't closed the door but they don't need our abstentions to govern so it's really hypothetical," she said.
NZN