His closest competitor, the Liberals' Chris Crewther, conceded defeat on Tuesday morning.

The Australian Electoral Commission is still counting the Mallee's votes, and will not declare a winner until it is mathematically impossible for another candidate to win.

But with 10,726 votes separating the two, Mr Broad has secured a comfortable lead in the two-candidate preferred count.

Mr Crewther conceded with 43.72 per cent of the electorate's votes to Mr Broad's 56.28 per cent of votes.

Mr Broad is the fourth Nationals Member for Mallee since the seat was created in 1949.

Andrew Broad's vision for Mallee

The result further cements the Mallee's reputation as the country's safest conservative seat.

It was the first time the Liberal Party had the opportunity to contest the seat in 20 years.

Former Nationals Member for Mallee John Forrest won the seat from Liberal candidate Andrew Kidd by 0.5 per cent when he was elected in 1993.

Mr Broad said he had been to Canberra and Melbourne since winning election.

In the past week he had discussed a Wimmera weather radar with Deputy Prime Minister Warren Truss.

"I am expecting delivery within the first term, which is the commitment I made," Mr Broad said.

He said he was also trying to book an appointment with the Treasurer Joe Hockey to discuss GrainCorp's potential sale to US-based agri-giant Archer Daniels Midland.

"The sale is not in our national interest," Mr Broad said.

"I'm not confident that ADM will be responsive to our growers."

Mr Broad is compiling a list of telecommunications black spots in the Mallee, based on one he inherited from Mr Forrest.

"There has been $100 million allocated for black-spot funding. I reckon I could just about spend that much in the seat of Mallee," he said.

He also raised the Sunraysia Modernisation Project with Minister for Agriculture Barnaby Joyce.

But he said his immediate priority was to find staff for his new offices.

"Parliamentary Services do the leases, not the member," Mr Broad said.

He said his head office would be in Mildura and he would have another office in Swan Hill. He was also planning on having a presence in Horsham, Nhill, Stawell and Kerang.

Mr Crewther wished Mr Broad all the best in his new role.

"I hope Andrew will fight as hard as he can for this electorate," Mr Crewther said.

He thanked everyone who helped his campaign.

"We fought as hard as we could and it was a reasonably close result at the end," Mr Crewther said.

He said he was open to further opportunities for public advocacy roles.