About 32,700 homes would remain without power overnight in Batemans Bay and Moruya and fires threatened major sources of power supply in the Snowy Mountains and other parts of the state.

NSW experienced severe fire danger on Saturday with temperature records tumbling in Sydney and Canberra.

However, a southerly change came through the state, bringing gusts of up to 128 kilometres per hour in the state's south-west on Saturday evening.

It also brought a spate of fast-spreading fires to the state's south, including a new fire near the Shoalhaven region and an expanding blaze that threatened residents in Eden and surrounds.

Prime Minister Scott Morrison issued a compulsory call-up to 3000 Australian Defence Force reservists to help communities affected by fires in NSW, Victoria, South Australia and Tasmania.

Cooler temperatures are expected to somewhat ease the fire danger on Sunday but a total fire ban will remain in place across the state.

Read our day's wrap here.