Voters in Wales have been asked to determine if the Welsh assembly should have direct law-making powers. The result should be announced some time on Friday afternoon.
The referendum asks people whether Wales should be able to pass its own laws in its 20 devolved areas, as opposed to applying to the UK Parliament.
At present legislation must first be approved by assembly members in Cardiff, before being passed by the Commons, the Lords and finally being given Royal Assent by the Queen.
A no vote would keep the existing system, and a yes vote would see the assembly being able to pass laws without seeking consent in Westminster.
The Electoral Commission said that of 2,289,042 eligible electors, 372,586 would be making their decision by post.
In an article for ePolitix.com, Plaid Cymru Westminster leader Elfyn Llwyd MP says the referendum is about giving power to the people and is an opportunity for the people of Wales that is "far too important to be missed".
He said: "A yes vote would take Wales forward into the future, and strengthen the assembly's hand in negotiating the best possible deal for the people of Wales.
"It would ensure that Wales is a country able to hold its head high and make decisions in its own interest."
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