NBN Co says it is on track to complete the rollout of Australia's broadband network by 2020, after adding 708,000 new homes and businesses to its system and more than doubling revenue in the September quarter.

Most of the growth in new customers comes on the back of a lift in fibre-to-the- node (FTTN) connections, with the number of FTTN users now exceeding fibre-to- the-premises (FTTP) users, the company said on Tuesday.

NBN Co earnt $405 million in revenue, compared to $181 million in the 2016/17 first quarter. Credit:Bloomberg

The government-owned business reached a total of 6.4 million premises as of September 30, up from 3.2 million homes and businesses at the same time last year, helping network revenue more than double to $405 million, compared to $181 million recorded a year ago.

Active uses also rose, lifting to 2.96 million at September-end, compared to 1.38 million a year ago, while operating expenses grew to 502 million, from 430 million last year, due to increased labour and direct network costs on the back of the expanding network.