Energy Minister Geoff Wilson was critical of the proposed strike action, saying it could put public safety at risk and cut electricity supply to homes and businesses.
He said the three government-owned corporations would seek written assurances from the union that public safety and electricity supply would not be compromised.
Power workers in the private sector in Queensland earned on average $31.80 per hour.
Ergon and Energex workers received $29.05 an hour.
The Government had offered a 4.5 per cent pay increase, but power workers wanted an extra $1.50 an hour. (10.3%)
An Energex spokesman said previous strikes had not adversely affected consumers.
He said maintenance upgrades, network improvements and connecting new customers would likely be affected by the industrial action
Ergon and Powerlink workers will strike for 48 hours from 6am Wednesday.
Energex staff in the southeast corner will be out for 24 hours from 6am Thursday.
"We will have standby crews who will go to emergencies . . . but there are going to be massive delays and people will be affected," Mr Simpson (ETU) said.
"Every safety issue, every loss of supply will be attended, but it will not be immediate. Someone could be without power for 48 hours."