Short answer: Tesla does not publish a Megapack-only total. The line mixes utility Megapacks and home Powerwalls, and counts a battery when it is installed or sold, not what is confirmed still online. The latest figure is 13.7 gigawatt-hours (GWh) in the third quarter of 2026. Full-year 2025 was 46.7 GWh. The record quarter is still 14.2 GWh in the fourth quarter of 2025.
Why it matters
The question people mean is how much battery storage Tesla has put on the grid. Tesla’s answer is large, and it is a slightly different question. A gigawatt-hour (GWh) is a gigawatt of power held for one hour, or a smaller flow held for longer. That is the scale of a utility battery project. A home Powerwall is a slice of that. Utilities buy the big version so solar and wind are still useful after the weather changes, and so a peak does not automatically mean starting a gas plant that runs only a few hours. Homes buy the small version for outages and expensive evenings. Tesla adds them together.
The mix is the catch. A record quarter can be a few Megapack projects hitting a delivery date, a rush of home batteries, or both. Most of Tesla’s updates do not say which.
How it works
Powerwall is the home and small-commercial battery. Tesla’s 2025 annual report describes it that way. In the fourth-quarter 2025 update, Tesla said its global Powerwall network supported more than 89,000 virtual power plant events in 2025, across over 1 million installed units, and that this let homeowners save over $1 billion on electricity bills. A virtual power plant (VPP) is software that calls on many home batteries at once so they can act, briefly, like one power plant. That is a count of units and events. Tesla does not turn it into GWh. This piece does not either.
Megapack is the container-scale battery for commercial, industrial, utility, and power-plant customers. Tesla says several can be grouped into installations of a gigawatt-hour or more. What those sites are actually for is covered in What problem does Tesla Megapack actually solve?
The deployment statistic is defined in the second-quarter 2026 update. It includes customer units when they are installed, and equipment sales at the time of delivery. A Megapack can enter the GWh figure when it is sold, before the site is energized. Tesla’s quarterly report for the three months ended 30 June 2026 adds that Megapack deployments swing with project milestones and logistics. A quiet quarter is not automatically a demand collapse. A big quarter is not automatically “all of this is already holding the grid up.”
What’s real now
Checked 3 October 2026. The newest Tesla number is the 2 October production, deliveries, and deployments release: 13.7 GWh of energy storage products in the third quarter of 2026. That note does not split Megapack and Powerwall. The full third-quarter shareholder update is scheduled for 21 October 2026.
- Second quarter 2026: 13.5 GWh, up 41% from 9.6 GWh a year earlier. Tesla called it the second-best quarterly deployment at the time, and a record on a trailing twelve-month basis. It reported record energy storage deployments in Europe, the Middle East, and Africa, supported by record deployments from Megafactory Shanghai. The June quarterly report says energy revenue rose 13% mainly because Megapack deployments increased, partly offset by a lower average selling price per Megapack and a decrease in Powerwall deployments. Direction, not a GWh split.
- First quarter 2026: 8.8 GWh. The same report states the half-year directly: 22.3 GWh through the second quarter.
- Fourth quarter 2025: 14.2 GWh. Tesla called that its highest quarterly energy storage deployments, driven by record Megapack deployments. It is still the high mark. Third-quarter 2026, at 13.7 GWh, sits above 13.5 and below 14.2. The 2 October release does not rank the new quarter.
- Full-year 2025: 46.7 GWh, up 49% from 31.4 GWh in 2024.
Factory capacity is not deployment. In the second-quarter 2026 update Tesla lists installed annual capacity of 40 GWh for Megapack in California (in production), 20 GWh for Megapack in Shanghai (in production), and more than 6 GWh for Powerwall in Nevada (in production). Megapack in Texas is listed as commissioning. The fourth-quarter 2025 update had listed Shanghai at 40 GWh; the later table says 20. Tesla does not explain the change there, so this piece does not invent a reason. The Q4 update also called the new plant Megafactory Houston; the Q2 update calls it Megafactory Texas. Nameplate is what the lines are built to make in a year. Deployed is what Tesla says it installed or sold.
Numbers
| Quarter | Storage deployed (GWh) | Where Tesla printed it |
|---|---|---|
| Q4 2024 | 11.0 | Q4 2025 Update |
| Q1 2025 | 10.4 | Q4 2025 Update |
| Q2 2025 | 9.6 | Q2 2026 Update |
| Q3 2025 | 12.5 | Q2 2026 Update |
| Q4 2025 | 14.2 | Q4 2025 Update — Tesla called this the high |
| Q1 2026 | 8.8 | Q2 2026 Update |
| Q2 2026 | 13.5 | Q2 2026 Update — Tesla called this second-best at the time |
| Q3 2026 | 13.7 | 2 October 2026 production release. No product split. |
| Year | Storage deployed (GWh) |
|---|---|
| 2021 | 4.0 |
| 2022 | 6.5 |
| 2023 | 14.7 |
| 2024 | 31.4 |
| 2025 | 46.7 |
Annual figures are the operational summary in Tesla’s Q4 and full-year 2025 update.
- 2026 so far, added up here: 8.8 + 13.5 + 13.7 = 36.0 GWh. Tesla has not printed a 2026 year-to-date line that includes the third quarter. Its June quarterly report stops at 22.3 GWh through the second quarter.
- 2021 through 2025, added up here: 103.3 GWh. Not a lifetime total — that table starts in 2021 — and not a count of batteries confirmed still online.
- Powerwall, separate from the GWh line: over 1 million installed units, and more than 89,000 virtual power plant events in 2025.
- Energy generation and storage revenue, second quarter 2026: $3,139 million, up 13% from a year earlier. Revenue is not deployment.
One calm limit on every figure above: Tesla’s storage line is Megapack plus Powerwall, and it includes sales at delivery as well as installed units. No public Tesla table in these updates splits the GWh by product.
What’s next
The 21 October 2026 update is the next primary page that could say whether the 13.7 GWh was mostly Megapack. Until then the split is unknown. In the second-quarter update, Megapack 3 and Megablock were still described as starting production in 2026 at the Texas plant, which was listed as commissioning. That is a factory step, not a deployment figure.
Sources
- Tesla third quarter 2026 production, deliveries and deployments (2 October 2026) — 13.7 GWh. No Megapack or Powerwall split.
- Q2 2026 Update (Tesla) — 13.5 GWh; the quarterly series back to Q2 2025; deployment definition; factory capacity table; Europe, Middle East, and Africa and Shanghai notes.
- Q4 and full-year 2025 Update (Tesla) — 14.2 GWh in the quarter, 46.7 GWh in 2025, annual series from 2021, Powerwall unit and virtual power plant figures.
- Form 10-Q for the quarter ended 30 June 2026 (Tesla) — 22.3 GWh through the second quarter; Megapack deployments up, Powerwall deployments down; Megapack timing caveat.
- Form 10-K for the year ended 31 December 2025 (Tesla) — Powerwall versus Megapack, in Tesla’s own words.
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