A union campaign against Chinese investment in New South Wales' electricity assets is racist and puts trade relationships at risk, the state's Treasurer says.

The Construction, Forestry, Mining and Energy Union (CFMEU) is running an advertising campaign claiming China's government-owned State Grid Corporation is a "likely buyer" of leases over the state's power network.

The state's Coalition Government is seeking a mandate to partially privatise state-owned electricity assets and Treasurer Andrew Constance met with State Grid Corporation representatives late last year.

The State Opposition has backed the union campaign, but Mr Constance said it represented a "racist rant" and CFMEU advertisements on television and online were "despicable".

"The bottom line is the Treasurer of the state - surprise, surprise - meets with investors from around the globe and also national investors as well," Mr Constance said.

"We've made absolutely no secret of the fact that when we undertook the market soundings late last year there was enormous interest from around the globe [and] here domestically in Australia in relation to Australian pension and superannuation funds.

"We should be excited about the interest in our state."

Mr Constance declined to go into details about the meeting, saying he was "not going to single out one set of investors".

"I'm not going to be part of anything, particularly in relation to a union boss who is about putting at risk our largest trading partner."

Labor's election campaign has been heavily focused on an anti-privatisation message, with the Opposition suggesting it could lead to higher power bills, job cuts and the loss of ongoing revenue.

"Selling the electricity network is wrong. Selling it to another country is just not on," the union advertisement said.

Foley opposes foreign government owning poles and wires

Opposition Leader Luke Foley said voters need to know which foreign entities the Government is talking to about its privatisation plans.

NSW Opposition Leader Luke Foley says he supports a union ad campaign warning about the Government's power privatisation plans. ( ABC News: Liz Foschia )

Standing before a TransGrid substation in Lismore, Mr Foley said the issue deserves scrutiny.

"I don't want a foreign government buying our electricity network," he said.

"Why is it that the Chinese People's Daily can report that Mr Baird's Treasurer has met with China's State Grid Corp about selling them our state's electricity network but Mr Constance won't admit it to the people of this state?"

In Penrith to spruik his plan to roll out the National Disability Insurance Scheme a year ahead of schedule in parts of Western Sydney and the Blue Mountains, Premier Mike Baird was instead peppered with questions about the matter.

He said there is interest from potential buyers in Australia and internationally, but there is no frontrunner.

"Not at all and look, I mean this is just another desperate distraction from an opposition running the most negative scare campaign," he said.

Disability services advocate and former Labor minister John Della Bosca joined Mr Baird this morning, but refused to be drawn on what he thinks of his party's anti-power privatisation stance.

A number of Mr Della Bosca's Labor colleagues, including former federal minister Martin Ferguson, have launched stinging attacks on the policy.

Mr Della Bosca supported the sale of electricity generators when he was in Government, but today would not offer an opinion.

"I don't want to continue and prolong this important press conference about the National Disability Insurance Scheme with my now quite irrelevant views about the electricity industry," he said.

"But sufficient to say, my views have been widely canvassed, they're on the public record, they haven't significantly changed."