NBN upgrade to single business in Barnaby Joyce’s electorate to cost $630,000

Joyce wrote letter of support for ASX-listed Costa Group for fibre-to-the-premises conversion under Coalition grants program

• Get the free Guardian app; get our morning email briefing

Building a single fibre connection to a business in Barnaby Joyce's New England electorate is expected to cost more than $600,000, almost double the original estimate, documents obtained by Guardian Australia reveal.

In February, Guardian Australia reported that the ASX-listed Costa Group's tomato plant in Guyra received more than $500,000 under the federal government's regional connectivity program to switch from satellite NBN to a fibre-to-the-premises connection.

Sign up to receive an email with the top stories from Guardian Australia every morning