The latter firm has announced they are pulling production of the cells at Tesla's New York Gigafactory 2 plant.
The company said in a statement that the decision was based on the "broader streamlining of its global solar operations".
And Panasonic insisted it will not have any impact on Tesla, who are seeking new applicants for their solar energy plant.
They added: "Tesla plans to hire qualified applicants to new positions needed to support its solar and energy manufacturing operations in Buffalo."
Tesla - who won't be working with Panasonic on their latest solar roof tiles - has released their own statement, in which they insisted the departure of the firm will have "no impact" on their electric vehicle battery work in Nevada.
Elon Musk's firm told Reuters: "This decision will have no impact on Panasonic and Tesla's strong partnership in Nevada.
"The two companies will continue their industry-leading electric vehicle battery work taking place at Tesla's Gigafactory outside of Reno, Nevada."