Rivian is pushing back deliveries of its long-awaited R1T electric pickup truck and R1S SUV several more months due to delays in production caused by “cascading impacts of the pandemic,” particularly the ongoing global shortage of semiconductor chips, according to a letter sent to customers from CEO RJ Scaringe. The R1T deliveries will begin in September with the R1S to follow “shortly” Scaringe wrote in the message.

Deliveries of the R1T Launch Edition, the limited edition release of its first series of “electric adventure vehicles,” were supposed to begin in July after being delayed by a month. This time, the delays

A segment of the letter:

Scaringe provided a few more details about the company’s progress, including it now employs more than 7,000 people. The Rivian factory in Normal, Ill., has two separate production lines producing vehicles, according to Scaringe. One is dedicated for the R1 vehicles and other line is for its commercial vans.

Scaringe said Rivian has “built hundreds of vehicles as part of our validation process, with many of those spotted out in the wild covered in unique vinyl wraps.” He also addressed why those vehicles haven’t been delivered to customers, noting that the company believes “it is critical to both our long-term success and your ultimate satisfaction that the quality and robustness of our launch products truly sets the tone for what to expect from us as a brand.”

The founder and CEO also acknowledged that the company needed to improve how it communicates specifics around deliveries.