Unifor Local 444 has a tentative collective agreement for workers at NextStar Energy, Windsor's new electric vehicle battery plant.
The union said the deal marks a "significant milestone and sets the bar in securing strong representation and protections for workers in the emerging electrified sector."
A ratification vote is on Sunday at the Ciociaro Club in Oldcastle. The doors open at 8:30 a.m., and the meeting starts at 10 a.m.
"All eligible NextStar Energy employees are encouraged to attend. Voting will be conducted using employee badge identification," said a release.
"This tentative agreement reflects our union's unwavering commitment to fairness, respect, and a strong future in this new sector," said Unifor Local 444 President James Stewart.