On Sunday, Tesla and Panasonic announced a collaboration on the manufacture of photovoltaic cells and modules in Buffalo, New York.
Under the deal, which will only go ahead if shareholders approve Tesla's takeover of SolarCity, Tesla will make long-term purchases of PV cells and modules from Panasonic for use in a solar energy system that works with the Powerwall and Powerpack.
Panasonic will start production in Buffalo to meet Tesla's requirements from 2017, the companies said.
Tesla offered to buy SolarCity in late June, but the deal has been criticizedfor a variety of reasons, such as being a poor use of Tesla's cash or a distraction for Tesla executives.
Musk has insisted that SolarCity's business would complement Tesla's stationary storage products, such as the Powerwall and Powerpack, helping the company to provide a fully integrated, sustainable energy system.
--CNBC's Phil Lebeau contributed to this report.
Correction: This story was revised to correct typos in Tesla.