Supporters of MMP are planning a celebration on Saturday when the result of the referendum on the electoral system is announced.
It will be released at 2pm, the same time as final election results.
Advance referendum votes were counted before the November 26 election and announced on the night, showing 53.7 per cent want to keep MMP and 42.6 per cent want to change to another system.
That was good enough for the Keep MMP campaigners to plan a party in a Wellington bar.
Their opponents, the Vote for Change lobby group, haven't said anything about celebrating.
The referendum asked two questions - whether voters wanted to keep the proportional representation system that was introduced in 1996, or change to another system.
The second question asked for a preference from a list of alternative systems, and if a majority vote for change there will be a second referendum in 2014 running off MMP against the most preferred option.
If a majority want to keep MMP, the Electoral Commission will review the system and recommend changes to Parliament.
The most contentious part of MMP is that it allows a party that wins an electorate seat to bring MPs into Parliament proportional to its share of the party vote - even if it doesn't reach the 5 per cent threshold which parties have to pass if they don't win an electorate.
That has led to the sort of vote rigging which went on in Epsom where National wanted ACT to win the seat, hoping it would bring in several MPs to support it in Parliament.
As it turned out, the ACT party vote was so small it only got one MP - John Banks, who won Epsom after being endorsed by Prime Minister John Key.
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