Labor is continuing to demand answers from New South Wales Premier Mike Baird following reports of corruption claims and a "massive audit" of a Chinese company seen as a potential bidder for the state's power assets.

The Opposition this week focused its campaigning on contact between the Baird Government and the Chinese government-owned State Grid Corporation, with Labor leader Luke Foley raising national security issues and saying he did not want a foreign government owning the state's poles and wires.

A union-backed advertising campaign targeted Treasurer Andrew Constance for meeting company representatives, while Mr Baird refused to go into details about a "roundtable" he addressed in China last year, which was attended by State Grid Corporation's president.

In May last year, the South China Morning Post reported that State Grid Corporation had "been told to prepare 1,000 workspaces for state inspectors to conduct an accountability audit of the company's chairman, Liu Zhenya".

Quoting an unnamed source, the newspaper reported: "The audit office and other authorities had previously received letters alleging financial problems and accusing the power company's management of potential corruption.

"The main purpose is to investigate the person's 'economic responsibility' - a term covering a wide range of managerial roles - during his tenure."

Mr Foley said voters deserved to know what discussions the company was having with the Government.

"[Mr Baird] is not open and upfront about who he has met with," Mr Foley told the ABC's AM program.

Mr Baird said Mr Foley was "overseeing what I think is one of the most incredible scare campaigns ever seen in the history of state politics".

"It's why people such as [former federal minister] Martin Ferguson - respected Labor figures - are calling them out," Mr Baird told RN Breakfast.

"I've met with thousands of investors across the world and that's your job as Treasurer and Premier."

'Plenty of claims made from all sides'

Meanwhile, Mr Foley said he supported the right of unions to raise concerns about possible Chinese investment in the state's electricity network.

The CFMEU's anti-privatisation advertisement said "selling the electricity network ... to another country is just not on". ( ABC News )

Race Discrimination Commissioner Tim Soutphommasane criticised anti-privatisation advertisements, which focused on the prospect of State Grid Corporation's investment, for "inflaming xenophobia".

The Construction, Forestry, Mining and Energy Union (CFMEU) advertisements ran on television and were published online.

"In this case, it is disappointing that political advertisements have resorted to such fear-mongering," Mr Soutphommasane told The Daily Telegraph.

Mr Foley stressed that he opposed any foreign government having control of essential infrastructure, not just the Chinese government-owned corporation.

He avoided answering directly when asked if he would request the CFMEU withdraw its ads.

"I support the right of working people and their representative organisations to advertise in a democratic election under the rules devised by this Government," Mr Foley said.

Former Labor senator John Faulkner (L) joins Luke Foley on the campaign trail. ( ABC News: Liz Foschia )

"That's what I support. And there's plenty of claims made from all sides."

With just two days until voters go to the polls, Mr Baird campaigned in the western Sydney seat of Auburn, which Mr Foley is contesting for the first time after previously serving as an Upper House MP.

Mr Foley took his campaign to Campbelltown to talk up more than $1 billion worth of promised health upgrades in Sydney's west and south-west, including a $100 million paediatric surgical centre at Campbelltown Hospital.

He was joined by former Labor senator John Faulkner on his campaign bus to travel to the seat of Goulburn, where another former Labor senator, Ursula Stephens, is challenging Liberal MP Pru Goward.

Public sector staff protest against jobs privatisation

More than 100 public sector workers have walked off the job over the Baird Government's plan to privatise their jobs.

The IT, human resources and finance workers from ServiceFirst staged the walk-out at lunch time today in Parramatta and Haymarket.

They said they were angry with the Baird Government's plans to privatise their jobs and send them offshore.

The Public Services Association estimated up to 240 of the 300 positions were likely to be sent overseas.

General Secretary of the Association Steve Turner said workers wanted a commitment from the Government that their jobs were safe.

"You're breaking those commitments to the people of New South Wales and to the people who work for you in this public service," he said.

Minister for Finance and Services Dominic Perrottet said the Baird Government was committed to getting the best value for taxpayers.

"The Government is considering multiple delivery options for IT services, including regional locations, but no decision has been made about future arrangements for these services.

"An outsourced model provides ready access to the latest trends and skills in service delivery, the ability to constantly refresh technology and the transition from fixed to variable costs.

"An outsourced model also offers savings that can better be directed to frontline services that our citizens want - we make no apologies for giving the citizens of NSW the best deal and managing our finances responsibly."