Rural Fire Services face a new fire threat in the state's north while also battling 28 fires that continued to burn overnight.
Rural Fire Services Assistant Commissioner Rob Rogers, after only a "few hours sleep", told Fairfax Media the massive combined effort will continue at similar levels to Tuesday, when there were "catastrophic" fire conditions in parts of NSW.
A favourable change in the weather has eased conditions, Mr Rogers said.
A bushfire in Shoalhaven crosses the Princes Highway on Wednesday night. Photo: Twitter/NSWRFS
But now there are "severe" fire warnings for areas in the Hunter region all the way to the Queensland border and as west as Moree.
"We now have a lot of new fire threats that have been benign up to now," he said.
"Their risk goes into Queensland, so there is a whole new part of the state under threat."
NSW and ACT Fires - 8th January 2013
Residents in NSW areas with a "catastrophic" fire danger woke up to sweltering temperatures. The Southern Ranges and Illawarra/Shoalhaven areas have been given the highest possible fire danger rating. A total fire ban has been declared statewide, and all national parks, state forests and reserves have been closed to the public. Selected images available from www.fairfaxsyndication.com. Follow us at http:\twitter.com/photosSMH. Photo: REUTERS/Tim Wimborne
Mr Rogers was confident firefighters would have a blaze in Lithgow under control on Wednesday.
More than 100 hectares has already been burnt.
The Rural Fire Service will focus on Deans Gap in the Shoalhaven that on Tuesday jumped the Princess Highway and put Sussex Inlet under threat.
"There is a lot of fire there, it's the west side of the highway that is the significant problem," he said.
Another fire at Harden, 18 kilometres west of Yass, was one of the hardest to hit on Tuesday as record temperatures soared across NSW.
"That fire ran a long way. There are reports it burnt 1000 stock and a building was lost. We have teams today assessing the damage," Mr Rogers said.
Mr Rogers said it was "disappointing but a good result" in regards to three juveniles charged for starting a fire in Shalvey, in Sydney's west.
"Arsonists will be caught," he said.
The Premier Barry O'Farrell and Rural Fire Service Commissioner Shane Fitzsimmons on Wednesday will tour fire affected parts of south west