Energy
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.

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.
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:
- 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.
The 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 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:
- 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.
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
Energy
Tesla’s new Megablock system can power 400,000 homes in under a month
Tesla also unveiled the Megapack 3, the latest iteration of its flagship utility scale battery.

Tesla has unveiled the Megablock and Megapack 3, the latest additions to its industrial-scale battery storage solution lineup.
The products highlight Tesla Energy’s growing role in the company, as well as the division’s growing efforts to provide sustainable energy solutions for industrial-scale applications.
Megablock targets speed and scale
During the “Las Megas” event in Las Vegas, Tesla launched Megablock, a pre-engineered medium-voltage block designed to integrate Megapack 3 units in a plug-and-play system. Capable of 20 MWh AC with a 25-year life cycle and more than 10,000 cycles, the Megablock could achieve 91% round-trip efficiency at medium voltage, inclusive of auxiliary loads.
Tesla emphasized that Megablock can be installed 23% faster with up to 40% lower construction costs. The platform eliminates above-ground cabling through a new flexible busbar assembly and delivers site-level density of 248 MWh per acre. With Megablock, Tesla is also aiming to commission 1 GWh in just 20 business days, or enough to power 400,000 homes in less than a month.
“With Megablock, we are targeting to commission 1 GWh in 20 business days, which is the equivalent of bringing power to 400,000 homes in less than a month. It’s crazy. How are we planning to do that? Like most things at Tesla, we are ruthlessly attacking every opportunity to save our customers time, simplify the process, remove steps, (and) automate as much as we can,” the company said.
Megapack 3 is all about simplicity
The Megapack 3 is Tesla’s next-generation utility battery, designed with a simplified architecture that cuts 78% of connections compared to the previous version. Its thermal bay is drastically simplified, and it uses a Model Y heat pump on steroids. The battery weighs about 86,000 pounds and holds 5 MWh of usable AC energy. Tesla engineers incorporated a larger battery module and a new 2.8-liter LFP cell co-developed with the company’s cell team.
The Megapack 3 is designed for serviceability, and it features easier front access and no roof penetrations. About 75% of Megapack 3’s total mass is battery cells, with individual modules weighing as much as a Cybertruck. It’s also tough, with an ambient operating temperature range from -40C to 60C. This should allow the Megapack 3 to operate optimally from the coldest to the hottest regions on the planet.
Production is set to begin at Tesla’s Houston Megafactory in late 2026, with planned capacity of 50 GWh per year. Additional supply will come from Tesla’s 7 GWh LFP facility in Nevada, which is expected to open in 2025, as well as with third-party partners.
Energy
Tesla Energy is the world’s top global battery storage system provider again
Tesla Energy captured 15% of the battery storage segment’s global market share in 2024.

Tesla Energy held its top position in the global battery energy storage system (BESS) integrator market for the second consecutive year, capturing 15% of global market share in 2024, as per Wood Mackenzie’s latest rankings.
Tesla Energy’s lead, however, is shrinking, as Chinese competitors like Sungrow are steadily increasing their global footprint, particularly in European markets.
Tesla Energy dominates in North America, but its lead is narrowing globally
Tesla Energy retained its leadership in the North American market with a commanding 39% share in 2024. Sungrow, though still ranked second in the region, saw its share drop from 17% to 10%. Powin took third place, even if the company itself filed for bankruptcy earlier this year, as noted in a Solar Power World report.
On the global stage, Tesla Energy’s lead over Sungrow shrank from four points in 2023 to just one in 2024, indicating intensifying competition. Chinese firm CRRC came in third worldwide with an 8% share.
Wood Mackenzie ranked vendors based on MWh shipments with recognized revenue in 2024. According to analyst Kevin Shang, “Competition among established BESS integrators remains incredibly intense. Seven of the top 10 vendors last year struggled to expand their market share, remaining either unchanged or declining.”

Chinese integrators surge in Europe, falter in U.S.
China’s influence on the BESS market continues to grow, with seven of the global top 10 BESS integrators now headquartered in the country. Chinese companies saw a 67% year-over-year increase in European market share, and four of the top 10 BESS vendors in Europe are now based in China. In contrast, Chinese companies’ market share in North America dropped more than 30%, from 23% to 16% amid Tesla Energy’s momentum and the Trump administration’s policies.
Wood Mackenzie noted that success in the global BESS space will hinge on companies’ ability to adapt to divergent regulations and geopolitical headwinds. “The global BESS integrator landscape is becoming increasingly complex, with regional trade policies and geopolitical tensions reshaping competitive dynamics,” Shang noted, pointing to Tesla’s maintained lead and the rapid ascent of Chinese rivals as signs of a shifting industry balance.
“While Tesla maintains its global leadership, the rapid rise of Chinese integrators in Europe and their dominance in emerging markets like the Middle East signals a fundamental shift in the industry. Success will increasingly depend on companies’ ability to navigate diverse regulatory environments, adapt to local market requirements, and maintain competitive cost structures across multiple regions,” the analyst added.
Energy
Tesla inks multi-billion-dollar deal with LG Energy Solution to avoid tariff pressure
Tesla has reportedly secured a sizable partnership with LGES for LFP cells, and there’s an extra positive out of it.

Tesla has reportedly inked a multi-billion-dollar deal with LG Energy Solution in an effort to avoid tariff pressure and domesticate more of its supply chain.
Reuters is reporting that Tesla and LGES, a South Korean battery supplier of the automaker, signed a $4.3 billion deal for energy storage system batteries. The cells are going to be manufactured by LGES at its U.S. factory located in Michigan, the report indicates. The batteries will be the lithium iron phosphate, or LFP, chemistry.
Tesla delivers 384,000 vehicles in Q2 2025, deploys 9.6 GWh in energy storage
It is a move Tesla is making to avoid buying cells and parts from overseas as the Trump White House continues to use tariffs to prioritize domestic manufacturing.
LGES announced earlier today that it had signed a $4.3 billion contract to supply LFP cells over three years to a company, but it did not identify the customer, nor did the company state whether the batteries would be used in automotive or energy storage applications.
The deal is advantageous for both companies. Tesla is going to alleviate its reliance on battery cells that are built out of the country, so it’s going to be able to take some financial pressure off itself.
For LGES, the company has reported that it has experienced slowed demand for its cells in terms of automotive applications. It planned to offset this demand lag with more projects involving the cells in energy storage projects. This has been helped by the need for these systems at data centers used for AI.
During the Q1 Earnings Call, Tesla CFO Vaibhav Taneja confirmed that the company’s energy division had been impacted by the need to source cells from China-based suppliers. He went on to say that the company would work on “securing additional supply chain from non-China-based suppliers.”
It seems as if Tesla has managed to secure some of this needed domestic supply chain.
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