Amazon is joining Walmart in pointing the finger at Tesla solar panels for fires on the roofs of their facilities in what is yet another hiccup for Tesla’s embattled solar business.

  • Amazon said Tesla solar panels caught fire in June 2018 at one of its warehouses in Redlands, California.

  • Amazon’s disclosure comes days after Walmart sued Tesla for breach of contract and gross negligence after seven stores experienced roof fires allegedly caused by faulty Tesla solar panels. Both companies later said they are working together to “addressing all issues.”

  • Amazon said it would not install any more Tesla panels.

In a statement to Forbes, a Tesla spokesperson said in an email that the Amazon fire was an “isolated event” at one of 11 Amazon sites with solar panels.

“Tesla worked collaboratively with Amazon to root cause the event and remediate. We also performed inspections at the other sites, which confirmed the integrity of the systems. As with all of our commercial solar installations, we continue to proactively monitor the systems to ensure they operate safely and reliably,” the statement continues.

Amazon did not immediately respond to a request for comment. Tesla did not respond when Forbes asked whether the company has plans for broader inspections of both commercial and residential solar power installations.

According to a Business Insider report, Tesla was aware of problems related to its solar panels. In the summer of 2018, around the same time as the Amazon fire, Tesla launched a secret internal project called Project Titan to replace what the company said were faulty “connectors” manufactured by Connecticut-based Amphenol, according to the report.

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Key Background: Tesla’s embattled solar business has been plagued by plunging sales, production delays and layoffs since CEO Elon Musk acquired solar company SolarCity for $2.6 billion in 2016.

Musk hasn’t tweeted about the Walmart or Amazon complaints, but instead announced a revamped pricing plan in an effort to boost the slowing solar panel business. The new pricing model allows residents in six states to rent solar power systems starting at $50 a month ($65 a month in California) instead of buying them up front.