Tesla Motors isn't just a car company.

That's been true for some time, as Elon Musk's firm has pushed its way into the energy sector over the past two years.

But now the company is making it official. A new SEC filing on Wednesday revealed that the company will change its name from Tesla Motors to Tesla Inc. The filing was first spotted by Business Insider.

The move is indicative of Tesla's changing business model since Musk co-founded it in 2006. Initially a maker of high-end electric sports cars, Tesla has shifted into energy products like solar panels and home batteries. It also agreed to acquire SolarCity, which Musk co-founded, in November for $2.3 billion.

Tesla's solar roofs, unveiled in October and set to launch later this year, will collect solar energy and power homes and electric vehicles. Musk says an installation will cost the same as that of a regular roof, and that the roofs will be 98 percent as efficient as standard solar panels. To ramp up its production, the company will soon begin manufacturing solar panels at Panasonic's plant in Buffalo, New York.

Tesla also recently introduced the second generation of its Powerwall home batteries. About the size of a suitcase, they collect excess energy from the sun and the solar grid and store it for later use. The company's larger Powerpack home batteries are used mainly to power commercial buildings--or can be bundled to form an energy-storing power plant. Tesla brought its first such plant online earlier this week, as part of a public grid in Ontario, California.

Those batteries will primarily be made at Tesla's massive Nevada Gigafactory, which began mass producing lithium ion cells in January. Musk claims that when the factory is complete, it will produce more lithium ion batteries annually than were produced in the entire world in 2013.

Tesla's shift into energy hasn't been by happenstance: Musk's intention to move the company toward solar energy has been on the company's site since 2006.

Even so, his decision to merge Tesla with SolarCity was not without its critics. The solar company has never posted a profitable year, and the deal was perceived by some analysts as a SolarCity bailout. Several Tesla shareholders sued to attempt to block the acquisition, which was eventually overwhelmingly approved by shareholders from both companies.

Tesla, which for a decade used the domain teslamotors.com, acquired the tesla.com domain in February 2016. It had been owned since 1992 by Stu Grossman, an engineer and Nikola Tesla fan who left it virtually unused.

"Just wanted to thank Stu G for tesla.com," Musk tweeted at the time. "Know it meant a lot to you. Will take good care." Five months later, the company officially changed its domain.