Tesla’s 2016 acquisition of SolarCity is looking worse and worse. And its $1 billion solar gigafactory in Buffalo, New York, which the state built, subsidized, and equipped for SolarCity, seems to be primarily operating as a Panasonic plant.

The news: The overwhelming majority of the solar cells produced at the facility are now being sold overseas rather than being used in Tesla’s “Solar Roof” photovoltaic product, according to a Reuters report on Wednesday, citing a letter to US customs officials from Panasonic, Tesla’s partner on the plant.

That product was designed to resemble rooftop shingles with solar cells embedded inside, an effort to differentiate the offering in the commodity solar panel business. But the line appears to have been a flop. California’s utilities have connected only 21 such systems, according to state data obtained by the news service. And just “a few” were installed in the Northeast, Reuters reported, citing an anonymous former employee.

In the more than two years since Tesla acquired SolarCity, its overall solar installations have plummeted by more than 76%.

A Tesla spokesperson told Reuters it’s “actively installing” the Solar Roof product in eight states but declined to discuss its purchases from Panasonic or provide overall installation numbers.

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