Greens insiders are venting their frustration on NSW Greens, saying their campaign was outdated and failed to capitalise on the increasing number of inner city progressives after leader Richard Di Natale defended the party's national results on Sunday.

The Greens are unlikely to gain a second lower house seat and have lost South Australian senator Rob Simms in South Australia, who was seen as a rising talent.

Mr Simms said he was disappointed with the result which he attributed to the rise of Nick Xenophon Team in the state. The Greens had a 2.3 per cent swing against them in SA.

Greens leader Dr Richard Di Natale addresses supporters during a election party on July 2, 2016 in Melbourne. Luis Ascui

"The party's done very well. Certainly there's some things we need to reflect on so we can prepare for the next election," he told The Australian Financial Review.

The Greens have gained 9.9 per cent of the primary vote with 78 per cent of the vote counted, up from 8.6 per cent in 2013 but down from 11.8 per cent in 2010. They made the greatest gains in Queensland, ACT and Victoria where they had swings of 2.5, 2.2, 2.1 per cent respectively. In NSW they had just a 0.6 per cent swing in their favour.