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City official Bryan Frois told Reuters the Markham facility opened this summer, marking an expansion of another site in neighboring Richmond Hill.

Tesla did not immediately comment on the mayor’s tweet. Last year, Tesla senior vice president Andrew Baglino said at the Battery Day event that its “vertical integration” with Hibar and others would allow them to build batteries faster and scale up production of its 4680 battery cells.

Baglino said last month that Tesla will start delivering its first vehicles with 4680 batteries early next year, but added that “this is a new architecture and unknown unknowns may exist still.”

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