Labor's David O'Byrne says the potential sale of Hydro Tasmania's mainalnd retail arm Momentum should be off the table.
Momentum Energy is a Melbourne-based gas and electricity retailer with about 300 workers in Victoria and Tasmania.
Hydro Tasmania chief executive Evangelista Albertini last week said the company was reviewing its options for its retail arm including its potential sale.
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He said the security of Tasmanians jobs would be a key condition of any potential divestment process.
Mr O'Byrne on Sunday said Premier Peter Gutwein and Energy Minister Guy Barnett needed to intervene on the potential sale of Momentum Energy.
"(It) is a money-making asset for the Tasmanian people," he said.
Hydro last week announced it would undertake a business structure which would result in the loss of 50 jobs.
Mr O'Byrne said there was no justification for this restructure.
"There is no evidence to say this will make the Hydro's balance sheets and its workforce stronger," he said.
Australian Services Union organiser Karen Tantari said the state-owned company's workers felt fatigued from restructures.
"This is the second one in just over 12 months," she said.
"Not only do we have members that will be losing their jobs, we'll have members that will still be there but overworked and worried about outsourcing."
Energy Minister Guy Barnett last week said the decision on job cuts was a matter for Hydro Tasmania's chief executive and its board.
Professionals Australia state director Luke Crowley said the government had provided Hydro Tasmania's board with directives in the past, particularly on Enterprise Bargaining Agreement negotiations.
"To run away now and suggest that it's purely a matter for Hydro and its board is a bit ridiculous," he said.
Mr Barnett on Sunday said the national electricity market was a fast, evolving complex challenge.
"We listen to our businesses, we read the markets and prepare for the future," he said.
"I am assured Hydro will take the utmost care when working with, training and supporting any displaced workers."
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