Dunedin residents waiting for the southern hemisphere's fastest internet speeds remain in the dark.

Chorus has yet to confirm when it will start installing the infrastructure needed for widespread ultra-fast broadband.

That's despite promising a city-wide upgrade as the main prize in its national Gigatown competition.

Dunedin won the contest in late November, after more than a year of campaigning.

A Chorus spokesperson told 39 Dunedin News the work to implement faster internet is expected to begin at the end of February.

But there's no detailed timeline for when locals and businesses can start utilising the upgraded infrastructure.