The union accused the Nigerian government of not following proper procedure.
The National Union of Electricity Employees has rejected the Federal Government's offer of N384 billion exit package for workers of the Power Holding Company of Nigeria (PHCN).
The Minister of Labour and Productivity, Emeka Wogu, announced the package after the Federal Executive Council Meeting on Wednesday.
The union's General Secretary, Joe Ajaero, in a statement in Abuja on Thursday, described the offer as provocative.
Mr. Ajaero said that the technical committee set up by the Federal Government to look into the workers' exit package issue had not concluded its report.
He claimed that the committee had discovered some errors in the data used for the computation of the package.
"So, the union was surprised to hear that the Federal Government had concluded the computation of the exit benefits of members without reference to the technical committee," the statement said.
The statement described the package as inadequate, noting that one third of the workers were excluded and majority of those captured had their entitlements calculated on two levels lower than their grades.
The union urged the Federal Government to allow the technical committee to finish its work.
"I said the matter on regularisation of casual staff had yet to be concluded and their benefits were supposed to be included too.
"The calculation of the exit package was not based on accurate data and, therefore, unacceptable by the union. The union will resist it through legal means," he said. (NAN)