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Prime Minister Anthony Albanese will hold formal talks with Chinese President Xi Jinping on the sidelines of the G20 summit.

The bilateral meeting will be the first one-on-one meeting between the leaders of the two countries since 2016.

Mr Albanese will meet with Mr Xi on Tuesday afternoon, ahead of a range of other bilateral talks at the international summit in Bali.

The prime minister said he was looking forward to the talks, describing them as constructive.

"We enter this discussion with goodwill. There are no preconditions on this discussion," he said.

"Australia will put forward our own position."

Mr Albanese would not reveal what he planned to talk to Mr Xi about, but said it was in the "mutal interest" of both nations for the meeting to take place.

"We need to co-operate with China where we can, will disagree where we must, but will act and have dialogue in our national interest," he said.

In a keynote speech ahead of the G20 summit, Trade Minister Don Farrell said Australia needed to diversify its trade relationships, with the geo-strategic case for a European Union free trade deal having strengthened.

Senator Farrell indicated Mr Albanese would tell Mr Xi the removal of $20 billion in trade barriers would be crucial for the relationship between Canberra and Beijing returning back to normal.

While Chinese duties on barley and wine were being formally challenged through the World Trade Organisation system, Mr Farrell said Australia was open to discussing "possible off-ramps" to get to another solution.

Mr Albanese arrived in Bali on Monday afternoon and met with Indonesian President Joko Widodo, accompanied by Treasurer Jim Chalmers.

He confirmed he will have bilateral talks with the new UK Prime Minister Rishi Sunak, French President Emmanuel Macron and Indian Prime Minister Narendra Modi.

The prime minister gave a keynote speech to the B20 summit which brings together political and business leaders ahead of the G20.

He urged collaboration in all nations' interests by reducing tariff obstructions and increasing trade agreements.

"We can achieve far more together than we ever will alone," he said.

"Recovering stronger depends on recovering together."

Australia and Indonesia's peak business groups signed a new deal to expand trade, build economic opportunities and lift living standards in both nations.

The Business Council of Australia (BCA) and Indonesia's KADIN signed the agreement beside Mr Albanese.

BCA chief Jennifer Westacott said it was a "welcome reset" on foreign policy.

"The government has rightly made our relationship with Indonesia a priority, and businesses from both nations agree," she said.

"We welcome this chance to build relationships and explore opportunities for two way investment that creates jobs, gets new industries off the ground and makes our region stronger."

Tackling climate change will also feature heavily during the summit.

The prime minister urged governments and businesses to invest in clean energy sources and spruiked Australia's role in the global transition to renewables.

"We know Australia can be a renewable energy superpower and we are working to grow our clean energy export industry," he said.

"We are committed to co-operating with other nations to help reduce their emissions, grow their economies and improve living standards."

Global recovery from the COVID-19 pandemic and taming inflation impacting economies will also be key themes of Mr Albanese's speech.

Greens leader Adam Bandt said there needed to be a broad review into whether trade deals delivered for Australia, and he wanted to see a de-escalation in tensions with China for the region.

© AAP 2022

Dozens of people have been rescued from their roofs as an "unbelievable" deluge flooded a small NSW town and powerful storms lashed much of the central west.

"This is a very serious situation," Emergency Services Minister Steph Cooke said on Monday.

"The entire central west of NSW has been hit very hard in the last 24 hours.

"The ground is so saturated, that all it takes is one heavy downpour to cause the type of life-threatening flash flooding we have experienced overnight and into today."

The main areas of severe impact are the towns of Parkes, Forbes, Molong, Eugowra, Cowra, Canowindra, Blayney, Young and Yass.

Some 140 flood rescues were carried out in the small town of Eugowra, including 100 from roofs.

"With a population of 700, one in five residents have been rescued in the last few hours, by helicopter or by boat," Ms Cooke said.

"This (severe weather) event is now in its 62nd day, and every day it throws up new challenges."

Four people died in the last 62 days as a result of the severe weather, although no deaths were reported in the previous 24 hours, she said.

Twelve flood rescue operators were flying in from New Zealand to support exhausted State Emergency Service crews in Parkes, Ms Cooke said.

"The SES is now also working with authorities in Singapore and the United States of America to secure additional support."

It was the first time the SES had made a request for overseas assistance, SES Commissioner Carlene York said.

"Because of the length and the devastating effects of these floods."

The SES had responded to 173 flood rescues and 470 requests for help since 5am on Monday.

In the small central west town of Molong, dozens of residents sheltered in the local RSL overnight, as fast-moving floodwaters rose to roof height, and Australian Defence Force personnel rescued people from roofs.

"It was just unbelievable how fast the water came," Mary Mulhall told AAP from the Molong RSL Club on Monday.

"It rose really quick and then it sort of went down fairly quickly as well but it just devastated on its way through."

About three-quarters of the historic town is damaged, with numerous roads ripped up and the new hockey field destroyed.

"The shop owners would be devastated because most of the shops have all gone and (the) supermarket's just gone altogether."

Waters are beginning to recede in Molong's main street, while SES and Fire and Rescue crews begin a massive clean up.

It comes after both agencies launched into action about midnight, doorknocking homes, beginning evacuations and helping the ADF rescue people stranded on roofs.

Fire crews also rescued two people and their dog from knee-deep water inside a house, another couple from the top floor of a motel and waded through chest-high water with a police officer to reach another woman stranded in her inundated home.

At least two large shipping containers were carried through the centre of the historic town by floodwaters and are blocking the Mitchell Highway.

Premier Dominic Perrottet urged people in flood-hit areas to follow emergency warnings.

"It may be the case that you don't see flooding around you when those orders are put in place - that is because we expect and predict further flooding moving forward," he said.

He urged people not to drive through floodwaters, saying a significant number of rescues were because people tried driving on flooded roads.

"You wouldn't drive through a bushfire - don't drive in floodwaters."

Some 116 warnings have been issued by the SES, including for residents to evacuate to higher ground in Cowra, Canowindra, Derrinwong and Eugowra.

© AAP 2022

An umpire is among four men arrested over accusations of an AFL Brownlow Medal tally betting ring.

Victoria Police detectives from its Sporting Integrity Intelligence Unit arrested and interviewed four men on Monday over dubious betting activity connected to this season's medal count.

"In the days following the 2022 Brownlow Medal count, the AFL was made aware of potential suspicious activity by one of our betting agency partners and the AFL Integrity unit immediately gathered further information," the AFL's General Counsel Andrew Dillon said in a statement.

The AFL's integrity unit worked with the betting agency to gather further information alongside Sports Integrity Australia and Victoria Police.

Police are investigating how many matches may have had votes released and exactly how much money was awarded from the bets.

At this stage, authorities have no information to suggest the outcome of the votes were impacted.

"The allegations relate solely to the leaking or improper communication of the 3, 2, 1 voting outcomes of some specific matches during the season," Mr Dillon said.

"Post-game, the Brownlow votes are sealed and stored in a secure off-site location and not opened until they are delivered on stage on Brownlow night. The sealed vote cards are audited throughout the season by KPMG."

The league says police confirmed to it that one of the four men interviewed and since released is an umpire.

Detectives executed warrants on Monday at homes in Glenroy, Kilsyth, Oak Park, Drouin, Craigieburn and Doreen, seizing several mobile phones and electronic items.

A 32-year-old Glenroy man was interviewed over the offence of engaging in conduct that corrupts or would corrupt a betting outcome. He is expected to be charged on summons.

A second 32-year-old man from Glenroy was interviewed on the offence of using corrupt conduct information for betting purposes. He is expected to be charged on summons.

A 27-year-old Drouin man was interviewed for the offence of using corrupt conduct information for betting purposes and is expected to be charged on summons.

The final man, a 29-year-old from Oak Park, was interviewed on the offence of using corrupt conduct information for betting purposes and was released pending further inquiries.

The offences carry up to 10 years imprisonment.

"Victorians are well known for their love of AFL and in particular, the prestigious Brownlow Medal award, but equally they want to know that there is integrity, fairness and honesty behind this award," Commander Deb Robertson said in a statement.

Sport Integrity Australia confirmed it was supporting Victoria Police and the AFL in the inquiry, but did not comment further.

Carlton captain Patrick Cripps won this year's medal, polling 29 votes.

He beat 2020 winner Lachie Neale (28 votes), Gold Coast star Touk Miller (27 votes) and Fremantle midfielder Andrew Brayshaw (25 votes).

Anyone with information is asked to call Crime Stoppers on 1800 333 000 or visit the website www.crimestoppersvic.com.au

© AAP 2022