The Green Party says it believes it will have the required number of signatures to force a referendum on partial state asset sales by September.
The Greens, along with the Labour Party and a number of other organisations, have collected just over 170,000 signatures since May.
The threshold for triggering a referendum is 300,000.
Greens co-leader Russel Norman says it's important for people to have a say, even though the referendum would not be binding.
"People have got a right to have a say about whether these assets are going to be privatised or not," Dr Norman says, "and that's the purpose of the referendum. But it's also about keeping the pressure on the Government around the issue."