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Tesla PowerWall Debuts: $3,000 Home Battery

Tesla Energy has announced its new PowerWall residential storage battery. Price for a 7 kWh system is just $3,000. Several batteries can be interconnected.

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The world got its first look at the Tesla PowerWall yesterday during a splashy debut presentation – an event powered solely by energy collected from solar panels earlier in the day and stored in an array of PowerWall batteries. In essence, the PowerWall is a large uninterruptible power supply for homes. Elon Musk was in particularly high spirits as he modestly proclaimed this new technology could eliminate the world’s need for fossil fueled electricity forever.

Tesla Power Wall

As technology journalist and Tesla owner Daniel Sparks correctly predicted on Tuesday, Tesla’s battery storage business will be conducted under the name Tesla Energy — a name the company reserved more than a decade ago. Tesla Energy will provide battery storage systems for three potential markets; residential, commercial and utilities.

Tesla PowerWall Residential System

The biggest news about the Tesla PowerWall battery storage system for residential customers is the price. A 7 kWh PowerWall is just $3,000. That’s far less than most observers expected. A 10 kWh system lists for $3,500. Do you need more than 10 kWh of storage? No problem. The units are designed so that as many as 9 of them can be plugged together for a total of 90 kWh of storage.

Here are the specs as provided by the Tesla Energy website:

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  • Technology  Wall mounted, rechargeable lithium ion battery with liquid thermal control.
  • Models  10 kWh $3,500 — for backup applications.  7 kWh $3,000 — for daily cycle applications
  • Warranty  Ten year warranty with an optional ten year extension.
  • Efficiency  92% round-trip DC efficiency
  • Power  2.0 kW continuous, 3.3 kW peak
  • Voltage  350 – 450 volts
  • Current  5 amp nominal, 8.5 amp peak output
  • Compatibility  Single phase and three phase utility grid compatible.
  • Operating Temperature  -4°F to 110°F / -20°C to 43°C
  • Enclosure  Rated for indoor and outdoor installation.
  • Installation  Requires installation by a trained electrician. AC-DC inverter not included.
  • Weight  220 lbs / 100 kg
  • Dimensions  52.1″ x 33.9″ x 7.1″  (130 cm x 86 cm x 18 cm)
  • Certifications UL listed

Customers can sign up on the company website now to reserve a battery. Deliveries are expected to begin in late summer, with more capacity coming online as production at the Tesla GigaFactory begins in late 2016.

Tesla PowerWall units connectedThe PowerWall will be marketed to all homeowners, not just those with solar panels or other renewable energy systems. The concept is simple. The battery gets charged overnight when electricity rates are lowest. Then it is used to power the home during the morning and evening peak usage times, saving the customer enough money to more than pay for the system and installation.

If the customer has a home solar system, it will charge the PowerWall during the day, reducing the need to buy any electricity from the grid even further. Depending on local conditions, customers can even sell any excess power back to the local utility company, reducing their electric bills that much more.

Tesla PowerPack For Commercial Customers

Tesla Energy PowerWall batteries can help smooth out the electric energy demand curve.Tesla Energy has its sights on more than just residential customers. We know larger battery storage systems have been installed in 11 Walmart stores already. Now Amazon has committed to an enormous 4.8 mWh system for its western US data center, according to Gizmodo. Selected Target stores will also get Tesla Energy PowerPack systems.

The benefits of on-site battery storage are magnified for large scale commercial operations. In the traditional business model used by utility companies. they have no choice but to buy power from the grid during peak demand times. Having on-site energy storage capability will allow then to charge their batteries when electricity costs the least and use that stored energy when it benefits them the most. Here’s more from the Tesla Energy website:

Based on the powertrain architecture and components of Tesla electric vehicles, Tesla energy storage systems deliver broad application compatibility and streamlined installation by integrating batteries, power electronics, thermal management and controls into a turn key system.

Tesla’s energy storage allows businesses to capture the full potential of their facility’s solar arrays by storing excess generation for later use and delivering solar power at all times. Business Storage anticipates and discharges stored power during a facility’s times of highest usage, reducing the demand charge component of the energy energy bills. Energy storage for business is designed to:

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  • Maximize consumption of on-site clean power
  • Avoid peak demand charges
  • Buy electricity when it’s cheapest
  • Get paid by utility or intermediate service providers for participating in grid services
  • Back up critical business operations in the event of a power outage

It’s a simple business case to make — our energy storage system will save your business tons of money. What business owner wouldn’t be happy with that?

Tesla Energy Grid Scale Storage

The most important part of Thursday’s announcement may turn out to be Tesla Energy’s entry into the grid scale energy storage market. Southern California Edison and OnCor have indicated interest in partnering with Tesla Energy on large scale energy storage installations. Elon Musk said Thursday night that phase of the business will be based on multiples of 100 kWh basic units that can interconnect to provide up to 10 megawatt-hours of electrical storage. Why is that important?

Since utility grids were first invented, the model has been for large generating plants located in or near major cities supplying electricity to the surrounding area. Eventually, long distance power transmission lines were constructed to connect those city scale power systems into regional power grids supplying millions of customers.

But renewable energy sources like wind or solar farms tend to focus on relatively small installations located far from urban centers. They feed their power into the grid from the edges, not from the middle. Roof top solar sytems for individual homes and small businesses feed small amounts of power into the grid from hundreds or even thousands of locations in the middle of the grid.

Utility grids are simply not constructed to behave efficiently with all that electricity being supplied from multiple sources. Home solar in particular has led to a dramatic increase in voltage fluctuations across entire grids. If those fluctuations are large enough, they can damage computers and other digital devices. Grid scale storage batteries can absorb all those spikes and fluctuations coming in and feed clean, well regulated electricity back out.

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Generating plants and utility grids are expensive to build and maintain. Industry observers estimate utility companies in North America will need to spend as much as $ 1.5 trillion dollars by 2030 to build new electric generating facilities and maintain the utility grid. Some industry executives suggest that the best way to move forward is to dismantle the grid and transition to a microgrid model.

According to Green Tech Media, David Crane, CEO of NRG Energy, told an industry conference in February, 2014, “There will come a day, in a generation or so, when the grid is at best an antiquated system to a completely different way of buying electricity. Everyone just stop a moment and think how shockingly stupid it is to build a 21st-century electric system based on a system of 130 million wooden poles. Stop trying to rearrange the deck chairs on the Titanic, and start talking about, ‘How do we get rid of the grid?’”

Elon Musk will be more than happy to help Crane and his peers get rid of their grid. In his remarks, he told the audience that with 2 billion batteries and a lot of solar panels, the world could finally stop using fossil fuels to generate electricity altogether. He added that microgrids and renewable energy could empower large segments of the world’s population who presently have no access to electric power.  Musk has always been a champion of ” disruptive technology.” It doesn’t get much more disruptive than dismantling the electrical grid and making electric utilities obsolete.

Demand curve chart via CaliSO

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"I write about technology and the coming zero emissions revolution."

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Elon Musk

Why SpaceX just made a $60 billion bet on AI coding ahead of historic IPO

SpaceX has secured an option to acquire Cursor AI for $60 billion ahead of its historic IPO.

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SpaceX announced today it has struck a deal with AI coding startup Cursor, securing the option to acquire the company outright for $60 billion later this year, while committing $10 billion for joint development work in the interim. The announcement described the partnership as building “the world’s best coding and knowledge work AI,” and comes just days after Cursor was separately reported to be raising $2 billion at a valuation above $50 billion.

The move makes strategic sense given where each company currently stands. Cursor currently pays retail prices to Anthropic and OpenAI to the same companies competing directly against it with Claude Code and Codex. That means every dollar of revenue Cursor earns partially funds its own competition. With SpaceX bringing computational infrastructure to the Cursor platform, that could reduce Cursor’s dependence on OpenAI and Anthropic’s Claude AI as its providers. Access to SpaceX’s Colossus supercomputer, with compute equivalent to one million Nvidia H100 chips, gives Cursor the infrastructure to run and train its own models at a scale it could never afford independently. That one change restructures the entire unit economics of the business.

Elon Musk teases crazy outlook for xAI against its competitors

Cursor’s $2 billion in annualized revenue and enterprise reach across more than half of Fortune 500 companies gives SpaceX something its xAI subsidiary currently lacks, which is a proven, fast-growing software business with real enterprise distribution.

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For Cursor, SpaceX’s $10 billion in joint development funding is transformational. Cursor raised $3.3 billion across all of 2025 to reach that $2 billion in revenue. A single $10 billion commitment from SpaceX, even as a development payment rather than an acquisition, dwarfs everything Cursor has raised in its entire existence. That capital accelerates product development, enterprise sales infrastructure, and proprietary model training simultaneously.

The timing is deliberate. SpaceX filed confidentially with the SEC on April 1, 2026, targeting a June listing at a $1.75 trillion valuation, in what would be the largest public offering in history. The company is expected to begin its roadshow the week of June 8, with Bank of America, Goldman Sachs, JPMorgan, and Morgan Stanley serving as underwriters. Adding Cursor to the portfolio before that roadshow gives IPO investors a concrete enterprise software revenue story to price in, alongside rockets and satellite internet.

The deal also addresses a weakness that became visible after February’s xAI merger. Several xAI co-founders departed following that acquisition, and SpaceX had already hired two Cursor engineers, signaling where its AI talent strategy was heading. Cursor, for its part, faces a pricing disadvantage competing against Anthropic’s Claude Code.

Whether SpaceX exercises the full acquisition option before its IPO or after remains the open question. Either way, this deal reshapes what investors will be buying into when SpaceX goes public.

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Tesla Supercharger for Business exposes jaw-dropping ROI gap between best and worst locations

Tesla’s new Supercharger for Business calculator reveals an eye-opening all-in cost and location-based ROI projections.

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Tesla has launched an online calculator for its Supercharger for Business program, giving property owners their first transparent look at what it really costs to install Superchargers on site and what kind of return they can expect.

The program itself launched in September 2025, allowing businesses to purchase and operate Supercharger hardware on their own property while Tesla handles installation, maintenance, software, and 24/7 driver support. As Teslarati reported at launch, hosts also get their logo placed on the chargers and their location integrated into Tesla’s in-car navigation, meaning drivers are actively routed there. The stalls are open to all EVs, not just Teslas.


The new online calculator, announced by Tesla on Wednesday with the note that “simplicity and transparency” have been a problem in the industry, lets any business enter a U.S. address and get a real cost and revenue model. A standard 8-stall V4 Supercharger site runs approximately $500,000 in hardware and $55,000 per post for installation, bringing an all-in price just shy of $1 million. Tesla charges a flat $0.10 per kWh fee to cover software, billing, and network operations. Businesses set their own retail price and keep the margin above that fee.

Tesla expands its branded ‘For Business’ Superchargers

 

Taking a look at Tesla’s Supercharger for Business online calculator, we can see that ROI is not uniform, and the gap between a strong location and a poor one can stretch the breakeven point by several years.

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The biggest driver is foot traffic and how long people stay. A busy rest station, hotel, or outlet mall brings in repeat visitors who need to charge while they’re already stopped, pushing utilization numbers higher and shortening payback time.

Tesla Supercharger for Business ROI calculator

Tesla Supercharger for Business ROI calculator

Local electricity rates matter just as much on the cost side. Markets like California carry some of the highest commercial electricity rates in the country, which eats into the margin between what a host pays per kWh and what they charge drivers. At the same time, dense urban areas with high EV adoption tend to support higher retail charging prices, which can offset that cost if demand is strong enough. Weather also plays a role. Cold climates reduce battery efficiency and increase charging frequency, but they can also suppress utilization in winter months if drivers avoid stopping in exposed outdoor locations. Suburban and rural sites face a different problem: lower baseline EV traffic, which means a site with cheaper power and lower operating costs can still take longer to pay back simply because the stalls sit idle more often. Tesla’s calculator uses real fleet data to pre-fill utilization estimates by ZIP code, so businesses can run their specific address against these variables rather than relying on averages.

The program has seen real adoption. Wawa, already the largest host of Tesla Superchargers with over 2,100 stalls across 223 locations, opened its first fully owned and branded site in Alachua, Florida earlier this year. Francis Energy of Oklahoma and the city of Alpharetta, Georgia have also deployed branded stations through the program, as Teslarati covered in January.

Tesla now exceeds 80,000 Supercharger stalls worldwide, and the calculator makes the economic case for accelerating that number through private investment rather than company-owned sites alone.

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Tesla’s newest “Folding V4 Superchargers” are key to its most aggressive expansion yet

Tesla’s folding V4 Supercharger ships 33% more per truck, cuts deployment time and cost significantly.

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Tesla is rolling out a folding V4 Supercharger design, an engineering change that allows 33% more units to fit on a single delivery truck, cuts deployment time in half, and reduces overall installation cost by roughly 20%.

The folding mechanism addresses one of the least glamorous but most consequential bottlenecks in charging infrastructure: getting hardware from factory floor to job site efficiently. By collapsing the form factor for transit and unfolding into an operational configuration on arrival, the new design dramatically reduces the logistics overhead that has historically slowed Supercharger rollouts, particularly at large or remote sites where multiple units are needed simultaneously.

The timing aligns with a broader acceleration in Tesla’s network strategy. In March 2026, Tesla’s Gigafactory New York produced its final V3 Supercharger cabinet after more than seven years and 15,000 units, pivoting entirely to V4 cabinet production. The V4 cabinet itself is already a generational leap, delivering up to 500 kW per stall for passenger vehicles and up to 1.2 MW for the Tesla Semi, while supporting twice the stalls per cabinet at three times the power density of its predecessor. The folding transport innovation layers logistical efficiency on top of that technical foundation.

Tesla launches first ‘true’ East Coast V4 Supercharger: here’s what that means

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Tesla Charging’s Director Max de Zegher, commenting on the V4 cabinet when it launched, captured the operational philosophy behind these changes: “Posts can peak up to 500kW for cars, but we need less than 1MW across 8 posts to deliver maximum power to cars 99% of the time.” The design philosophy has always been about maximizing real-world throughput, not just peak specs, and the folding transport upgrade extends that thinking into the supply chain itself.

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