Hello! I'm your financial analyst friend. Today, we're going to discuss an article about Tesla's home energy storage solution, Powerwall, which highlights a common misconception among many people, even those outside the industry: we often think of Tesla as a car company, but in reality, its most profitable and hardest-to-copy areas might be "selling electricity" and "storing electricity."
The core logic of this article is quite clear, though it goes against intuition: Why does Tesla's energy storage product, which is touted as even more powerful than its cars, have only a brief introductory page on its official Chinese website, with no prices or purchase options? The answer isn't due to technical limitations or a lack of ambition; rather, it's because the power grid systems and business models in China and the United States are completely different.
Let me break down the article into five key points to help you understand the situation better:
1. Tesla's "Second Growth Curve": Cars May Be Declining, but Energy Business Is Rising
First, we need to correct a misconception. Many people focus only on the Model 3 and Model Y when thinking about Tesla. However, if you look at Tesla's 2025 financial report, you'll see a striking contrast:
- Automobile Business: Revenue decreased by 10%, sales fell by 8.6%, and the gross margin was only 17.8% (meaning the profit margin per car sold is shrinking.
- Energy and Storage Business: Revenue surged by 27%, with energy storage installations reaching a record high, and the gross margin was as high as 29.8%.
In simple terms: It's like a restaurant that used to make most of its money from selling hamburgers, but now finds that selling insulated delivery boxes and kitchen equipment is more profitable. Elon Musk has long predicted that the energy storage business will grow much faster than the electric vehicle business. So, Tesla is not just a car company; it's becoming an energy management company, with Powerwall being its flagship product in this new area.
2. Why Is Powerwall a Lifesaver in the US but Ineffective in China?
This is the article's main insight. The design of Powerwall—combining battery, inverter, and switch in one box—is a direct result of the US power grid environment:
- US Challenges:
- Frequent Outages: In 2024, US residents experienced an average of 11 hours of power outages per year, double the rate from a decade ago. Some areas, like South Carolina, had average outages of 53 hours.
- Outdated Infrastructure: The American Society of Civil Engineers rated the US power grid an "F-" (fail), with 70% of the infrastructure being outdated.
- Survival Need: In the US, installing energy storage is like having a fire extinguisher at home—essential for coping with hurricanes and snowstorms. Powerwall even has a "Storm Watch" feature that automatically charges the battery when a storm is forecast.
- Policy Support: The federal government provided a 30% tax credit (although it expires by 2025), which significantly boosted demand.
- China's Situation:
- Robust Grid: In 2025, the average power outage duration nationwide was only 6.04 hours, and this number is expected to continue to decrease. In urban areas of Beijing and Shanghai, households rarely experience outages (less than 1 hour per year).
- Lack of Urgency: In such a context, spending tens of thousands of yuan on energy storage doesn't make economic sense.
Conclusion: Powerwall is designed to solve problems specific to the US power grid, not those in China.
3. The Economic Calculus of Energy Storage in China
Since outages are rare in China, could installing energy storage save money by using cheaper electricity at night and more expensive electricity during the day? The article suggests this approach is becoming less viable:
- Reduced Price Gap: The price difference between peak and off-peak electricity has decreased from 0.83 yuan to 0.5 yuan in some regions.
- Longer Payback Period: The payback period has increased from 5.4 years to 9.1 years, making it less attractive for most households.
- Physical Constraints: Most urban residents in China live in high-rise buildings with shared rooftops, so individuals can't use them for energy storage. Only those in villas or self-built houses have suitable rooftops, but this group is small.
- Data: In the first quarter of 2025, energy storage installations (mainly for households and small businesses) decreased by 50% year-over-year.
In simple terms: In China, installing energy storage is not about preventing outages (since they are rare) or saving a lot of money (due to the smaller price difference). Therefore, the Chinese household market is not a primary target for energy storage.
4. Chinese Companies Didn't "Dare" Copy Powerwall; They Went Global
There's a common belief that Chinese companies are too risk-averse to develop similar products. The author disagrees:
- Chinese Energy Storage Companies: They understand the market well and have already started selling their products overseas. For example, Deye Co., Ltd. holds the largest market share in global residential energy storage inverters (20.6%), with 79.7% to 87.6% of its revenue coming from overseas.
- Other Companies: Companies like Pinen Technology and Ailuo Energy also have significant overseas revenue.
In simple terms: Chinese companies are like Chinese chefs who excel at making Sichuan cuisine. Since domestic consumers prefer lighter flavors, they opened restaurants abroad, where their food is very popular. Tesla also built a factory in Lingang, Shanghai, with a production capacity of 26 gigawatt-hours in 2025, 55.7% of its global total. These batteries are mainly exported to Australia, Europe, and Japan, not to Chinese households.
The Difference: Chinese companies are strong in hardware, but they hold a small share in the North American market (only 4.7% for Deye Co.). The gap lies in brand, distribution channels, certifications, and local services. They've succeeded in Europe, Asia, and Africa but not yet in the US.
5. The Real Gap: From Selling Hardware to Selling Services
The article raises a deeper question: Does Tesla really just sell batteries? No. Tesla is connecting millions of household batteries through software to create a massive "virtual power plant" (VPP):
- 2026 Plans: Tesla has signed agreements for 16.8 gigawatts of distributed virtual power plant projects with companies like Sunrun.
- Business Model Evolution: It's shifting from selling hardware to providing energy management services. When the grid needs more power, Tesla can command the batteries to discharge; when there's excess power, it can command them to charge. This turns millions of batteries into a valuable power asset.
In simple terms: While Chinese companies are still focused on selling hardware, Tesla has moved to providing energy management services, earning money from energy regulation and financial services.
Summary and Insights:
Powerwall doesn't sell well in China because the Chinese grid is robust and doesn't require such backup systems. For Chinese households, there's no need to rush into installing energy storage unless you have specific off-grid needs or live in a villa. For the Chinese energy industry, the real challenge is not to replicate Powerwall but to develop new services based on China's strong grid infrastructure, such as advanced energy trading, carbon management, and smart scheduling.
In one sentence: Tesla's Powerwall is a solution to the US power grid's issues, but China's grid is so reliable that it's not needed. Chinese companies' opportunities lie in leveraging their own strengths to develop new energy services rather than simply copying foreign models.