Nearly one million Australians have signed up for a higher speed NBN plan as retailers slash prices to encourage people to use the network.

Data compiled by the Australian Competition and Consumer Commission (ACCC) shows that over the last three months the number of Australians on the middle-tier 50 Mbps plan jumped from 158,959 to 989,360.

The basic NBN plan offers consumers speeds of 25 Mbps, while the top tier offers those willing to pay for 100 Mbps.

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ACCC Chairman Rod Sims said the radical uptake of middle-tier speeds was "remarkable" and largely due retailers being incentivised to push users to higher speed plans.

“We are pleased to see retailers taking up the higher speed services and enabling their customers to shift to 50Mbps plans," said Sims.

"This is good for consumers who can enjoy the benefits of higher speeds."

Yesterday, the NBN announced it now had 6.5 million premises ready to connect to the network, and 3.7 million premises already using an active service on the NBN.

The network also reported it was gaining $44 per month per user.

CEO Bill Morrow said everything is still on track for the entire network to be complete within two years.

"These results demonstrate the progress we’re making on our top three priorities, which are to complete the build by 2020, improve the end user experience, and deliver a modest return on the tax payer’s investment," said Morrow.

"We’ve shown stable performance against our long-term goals on the build side and significant improvements on customer experience.

"Our monthly progress report demonstrates that our customer experience program is working, and we know there’s more to do to get this right.

"The NBN Co team, delivery partners and RSPs are working quickly to make improvements across the industry for a better experience for all."

In March this year the Telecommunications Industry Ombudsman (TIO) reported that in the last financial year 27,195 complaints were made regarding the service delivered over the NBN.