The Economics of Tesla’s Batteries Business


Tesla, Inc. (TSLA) is a U.S. automotive and energy company based in Palo Alto, California. The company manufactures electric cars and solar panels as well as batteries and aeronautics. Tesla’s CEO Elon Musk heightened Tesla’s visibility in late 2018 with a SEC lawsuit. The lawsuit alleged that Musk made “false and misleading statements” on Twitter about the possibility of taking the company private. Tesla’s share price fell by approximately 10% following the news of the lawsuit. Tesla is also struggling to turn a profit. Through May 2020, it has a five-year annualized average operating margin of -8.39% and net margin of -11.27%.

In general, Tesla is only considered a slightly risky stock with a three-year annualized beta of 1.29. One of its manufactured products, batteries, deserves some attention. Supplier relationships and how batteries revenue is doing overall can be an important matter for Tesla as well as its shareholders.

Key Takeaways

  • Tesla entered the electric batteries market more prominently in 2015.
  • The 2015 Tesla Energy announcement debuted an electric home battery and an electric grid battery solution.
  • Tesla partners with Panasonic, who works jointly in Tesla’s Gigafactory to help the company produce all of its batteries.

Tesla’s Endeavors

Elon Musk is the founder of Tesla, the world’s first independent global electric car company. Musk also built the first viable private spaceflight company, SpaceX, which sends rockets into space to restock the international space station. He is also developing a high-speed underground transportation system linking Los Angeles to San Francisco called the Hyperloop.

When people complained that Tesla’s all-electric cars were too expensive for the middle class and that their driving range between charges was too short, Musk promised to work with battery manufacturers to cut costs and improve efficiency. When progress with its battery suppliers was too slow, Tesla took steps to get into the battery business more deeply. Then, in 2015, Elon Musk announced the company was going to start making solar batteries. The 2015 announcement helped to shore up more bargaining power with suppliers, while also introducing Tesla’s own lines of electric, solar batteries.

Understanding Current Batteries

Batteries are solid-state devices that store and release electrical current, powering an array of consumer electronics, cars, home utilities, and other devices. Lithium-ion (LiOn) is the key ingredient in most all batteries. LiOn is also the main component of most rechargeable batteries. Rechargeable batteries have become widely used in many applications. Different variations of them can now be found in everything from mobile phones and tablets to laptop computers and electric vehicles. While microchips and integrated circuits have become exponentially more powerful, smaller and cheaper battery technology has lagged. Improvements in LiOn batteries have been small and incremental.

In a modern smartphone, the computational effort is packed into a tiny portion of the device while the battery takes up most of the available space. The battery is also a large factor in the total cost of the device. For electric vehicles, the problem is compounded. Electric cars are essentially an array of battery packs on wheels. Under the hood you will find batteries and a battery-charged motor, which alleviates the need for any gas. 

Lithium, however, can be an unstable substance. Therefore the batteries must be built carefully so that they avoid damage during a typical car accident. Even small amounts of exposure to air or water can make lithium burst into flames. Ensuring that each battery is properly sealed and secured is an added cost. (For more, see: Why Are Tesla Cars So Expensive?)

Tesla’s Car Batteries

Beginning solar battery manufacturing in 2015 helped bring Tesla more powerfully into the electric battery business. This also gave it a little more leverage in the production of its own car batteries.

As of 2020, Tesla partners with Panasonic for its car battery building. Panasonic also supports the efforts of all battery manufacturing in Tesla’s Gigafactory. The partnership gives Panasonic a significant portion of space in the Gigafactory, which makes transporting Panasonic’s contributions simplified for the overall manufacturing process.

The Tesla Energy Batteries Announcement

Elon Musk’s May 2015 announcement was much anticipated. In May 2015, Musk announced Tesla Energy, expanding the company’s capabilities into a new reporting segment, now called Energy Generation and Storage. Its two inaugural products were a home battery and a grid battery. The new batteries build out the concept of electric storage. To support Tesla Energy Generation and Storage, the company has built an enormous battery factory (appropriately named a Gigafactory) in the Nevada desert. Its vision suggests as many as 10 Gigafactories around the world.


In 2019, Energy Generation and Storage brought in $1.5 billion, accounting for 6% of Tesla’s revenue. Automotive revenue brought in $20.8 billion, accounting for 85%.

Tesla’s Powerwall

The Powerwall is the home battery. The first-generation Powerwall was launched in 2015. An updated Powerwall 2.0 was announced in October 2016 with twice the storage capacity of the original. In 2020, two Powerwall batteries with supporting hardware cost $14,100. Installation can also cost anywhere from $2,000 to $8,000, according to EnergySage, a platform that researches and compares solar installation prices and companies.

To install the Powerwall as part of a solar-plus-storage system requires an energy system like solar. An average of 5 kilowatts (kW) solar energy system costs between $8,500 to $16,000 depending on the location and the equipment.

Although it might be costlier than other options in the initial stages, installing a solar-plus-storage system can be a worthwhile investment. The Powerwall can be used as a backup generator. Tesla owners can also use Powerwall for the home as well as charging their electric vehicles.

Tesla’s Powerpack

The Powerpack is a grid battery. This battery is intended to provide electric energy for much more than just a single home. One of the greatest advantages is the ability to potentially take an entire interconnected ecosystem entirely off the grid. The Powerpack is also known for its extraordinary backup capabilities.

The complexities of the Powerpack limit its use on a large scale. Some of its users include:

  • A luxury lodge in South Africa
  • A resort in Fiji
  • Application by Southern California Edison
  • The Hawaiian island of Kaua’i
  • And more

Competition in Electric Batteries

Tesla relies heavily on Panasonic for all of its battery manufacturing and especially for its car batteries. Other electric car manufacturers are also making inroads.

Electric car batteries and solar-powered battery charging are technologies that are evolving. For car buyers, a Tesla car still ranks at luxury sportscar level when it comes to price, but these prices are falling. For home and grid energy, the goal is reducing costs through stored energy. Home and grid costs can be significantly reduced when stored energy is used but manufacturing and installation costs still make the implementation cost high which requires longevity for an actual return on the investment.

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