The Labor and Liberal National Parties are both trying to appeal to Queensland's mining and manufacturing businesses with election pledges to cut electricity costs.
Premier Annastacia Palaszczuk visited a copper smelter in Mount Isa, while Opposition Leader Deb Frecklington visited a steel manufacturing company in north Brisbane on Wednesday.
Both leaders donned hi-vis vest for the second day of the campaign ahead of the October 31 election.
Ms Palaszczuk revealed that the state government had signed a deal to underwrite the $1.7 billion CopperString 2.0 project connecting the northwest mining region to the national grid.
She says the project will reduce electricity prices for local businesses, support rare earth mineral mining and protect local jobs.
"This is visionary, this is nation-building, this comes along once in a generation, and my government is absolutely pleased to be working with CopperString to build what is needed to connect Mount Isa to Townsville," Ms Palaszczuk said.
She made the announcement in Traeger, which is held by Katter's Australian Party MP Robbie Katter by a 28.5 per cent margin.
But she denied it was a bid to secure crossbench support should a hung parliament be elected.
"This is something that we have been focused on for a long, long time. It's been something that has been raised with us," she said.
Opposition Leader Deb Frecklington said underwriting a project that was already undergoing an environmental impact study wasn't a new plan.
"Business as usual will not drag Queensland out of this recession," Ms Frecklington said.
The LNP leader dropped into a steel fabrication plant in the Labor seat of Nudgee, held by Leanne Linard with a 14.3 per cent margin, to make her own pitch to lower power prices.
Ms Frecklington promised to provide a $493 million community service obligation, or subsidy payment, to the state-owned Energy Queensland to help businesses save up to 20 per cent on electricity costs.
She said the move would protect Energy Queensland's 7300 workers.
"We'll secure their jobs by making sure we grow manufacturing here in this great state of Queensland."
The premier received another YouGov poll boost on Wednesday, with the Labor leader ahead of Ms Frecklington on the question of who was a better economic manager, 40 per cent to 27 per cent.
It follows a YouGov poll released on Tuesday showing Labor leading the Liberal National Party 52 per cent to 48 per cent on a two-party preferred basis.
Ms Palaszczuk has promised to hand down a budget by the end of the year and ruled out any new taxes.
Ms Frecklington has also promised no new fresh taxes or public service redundancies.
There's growing speculation that LNP will allow public servant numbers to ebb via natural attrition, or not replacing workers who depart.
Ms Frecklington was again questioned about the LNP's costings, which she said will be released towards the end of the campaign, which is normal practice.
"How bored would you be if we released all of our announcements today?" she asked.
Meanwhile, the Greens received a boost after BHP withdrew from the Queensland Resources Council over the mining lobby group's advertising campaign against the minor party.
"BHP has expressed to the QRC on several occasions its opposition to this advertising approach and had formally requested that it be withdrawn," a company said on Wednesday.
"Unfortunately this has not occurred."
It's understood that fellow resource companies South 32 and the Anglo-American are considering their membership in the QRC over the anti-Greens campaign.
About 3.3 million Queenslanders go to the polls on October 31.