South Australia has been forgotten when it comes to infrastructure spending, with no new funding allocated in the budget, despite billions to be spent on other states, the State Government has said.

Treasurer Tom Koutsantonis has described the federal budget as one which "pretends that South Australia is not in the country".

Other states received significant infrastructure spends, including $8.4 billion for the inland freight railway to connect Brisbane to Melbourne and $5.3 billion towards the new Western Sydney Airport.

There were no new infrastructure spends for South Australia, with a $36.6 billion announcement for new power infrastructure part of an existing agreement for an asset recycling scheme.

"We made an agreement with (former federal treasurer) Joe Hockey when we exited the Motor Accident Commission that if we reinvested that in infrastructure they would give us a capital grant," Mr Koutsantonis said.

"This is simply that money coming into the budget, it is not new."

Disappointment over no new South Road funding

The Treasurer also said former prime minister Tony Abbott's 2013 promise to fix South Road in a decade has been "broken", with no extra money towards to project beyond what was already budgeted.

"Why has the Liberal party decided not to start funding projects here in SA?" he asked.

"What is about SA that they don't like?

"I think every single Liberal MP in South Australia should hang their heads in shame for not fighting for our state."

The Civil Contractors Federation in South Australia said that it was "astonished" that there was no commitment of new money for the north-south road corridor.

"Quite astonished," the federation's chief executive officer Phillip Sutherland said.

"They can't start the design work until there's a Federal Government funding commitment to do that. We're going to run the very grave risk of ending up with a dog's breakfast of a freeway across Adelaide."

South Australian Liberal Senator Simon Birmingham said his government was pouring money into South Australia, through investment in the defence industry and advanced manufacturing.

Federal Finance Minister Mathias Cormann said that there would be opportunities for South Australia.

He pointed to the "$10 billion in new money" that had been made available for national rail infrastructure.

"There's absolutely no reason why the South Australian Government wouldn't be able to successfully secure funding under that $10 billion," he said.

AdeLINK would be eligible for some of that, if it provides a solid business case.

Little in budget to help submarine build: Xenophon

Nick Xenophon is worried most of the money set aside for submarines will go overseas. ( ABC News )

SA Senator Nick Xenophon said there was little in the budget to help South Australia's future submarine builders in the short term.

"It looks as though next year there'll only be $319 million spent on the submarine project," he said.

"Most of that money will go to set up Australian teams in France, for the French design team, and for the US combat systems so most of that money will be going overseas."

He also agreed with Tom Koutsantonis that the state had been "dudded" by a lack of infrastructure funding.

Budget gives solar power a boost

One SA group pleased with the budget is Repower Port Augusta, which gets up to $110 million in equity funding to build a solar thermal plant.

"The only barrier to getting this to happen is if the State Government is going to purchase power or not," Repower Port Augusta's Dan Spencer said.

"With this federal investment completely confirmed now, there's no excuses for the state not to do it."

The Port Augusta solar plant will be based on the Crescent Dunes facility in Tonopah, Nevada. ( Supplied: SolarReserve )

The group estimates that solar thermal power will create up to 1,000 construction jobs and 50 ongoing jobs utilising similar skills to those needed to operate Port Augusta's old coal-fired power station.

Other budget announcements relevant to South Australia included $40 million in supplementary road funding for local councils, after it was cut by the Abbott government.