Feb. 27, 2020—Tesla and Panasonic are ending joint production of solar cells at Tesla’s Gigafactory 2 facility in Buffalo, N.Y., reported CNBC.

While Panasonic-made solar cells were going to be used primarily by Tesla to make its own solar panels, Tesla’s current Solar Roof product uses cells made in China instead. 

The joint venture started four years ago.

Panasonic is still a main supplier of battery cells to Tesla for its vehicle battery packs, and the two companies jointly occupies a giant plant, called Gigafactory 1, outside of Reno, Nev.