Police have confirmed a fourth person has died in bushfires impacting New South Wales.

The body was discovered in a burnt-out car on a road off the Princes Highway at Yatte Yattah, near Conjola Park, around 7.30am on Wednesday.

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The man has not been formally identified.

The news follows the death of volunteer firefighter Sam McPaul on Monday after his fire truck flipped near the NSW-Victoria border, and young father Patrick Salway and his dad, Robert Salway who died while defending their home in the state's south.

Meanwhile, a 72-year-old man remains missing, feared dead, at Belowra, 50km north-west of Cobargo.

Worsening conditions

More than 110 fires continue to burn across NSW on New Year's Day and losses from Tuesday's fires are likely to be widespread.

Rural Fire Service commissioner Shane Fitzsimmons on Wednesday said there were "heavy tolls" in terms of property damage and destruction, particularly in areas of south of Nowra, around Batemans Bay and in Cobargo.

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Fire conditions are expected to ease after a cool change, bringing gusts of up to 80km/h and dry lightning strikes, crossed the state.

However, dangerous conditions are expected to return on Saturday.

Total fire bans are in place for Southern Slopes, Southern Ranges and Central Ranges on Wednesday, ahead of predicted worsening conditions over the weekend.

No communication

Some of the worst-affected communities along the coast battled bushfires into Tuesday night with no power and limited telecommunications.

All power had been lost from South Nowra to Moruya and "potentially beyond", affecting at least 46,000 people and the supported telecommunications network.

Meanwhile, major roads, including several parts of the Princes Highway, are likely to remain closed for some time due to hazards.

- With AAP