Tesla · utility-scale
Tesla Megapack 3
shippingskidAC block (PCS integrated)liquid-cooledLFPBNEF Tier 1
Everything below comes from what Tesla publishes about the Megapack 3: the datasheet, the product page and press releases. Where a figure is not published, the field says so — we do not estimate.
Variants
Energy figures are nominal (beginning of life) as published by the manufacturer. One model, several duration options — the same enclosure with different power ratings.
| Variants | Energy | Power | Duration |
|---|---|---|---|
| 5 MWh AC (four units make a 20 MWh Megablock) | 5 MWh | not published | not published |
Specifications
| Cell chemistry | LFP |
|---|---|
| Cell capacity | not published |
| Cell configuration | not published |
| Cell supplier | not published |
| Form factor | skid |
| Block type | AC block (PCS integrated) |
| PCS integrated | yes |
| DC voltage | not published |
| Cooling | liquid-cooled |
| Ingress protection | not published |
| Operating temperature | -40…60 °C |
| Dimensions (L × W × H) | not published |
| Weight | not published |
| Energy density | not published |
| Round-trip efficiency | not published |
| Cycle life | not published |
| Calendar life | not published |
| Warranty | not published |
| Fire suppression | not published |
| Generation | 3 |
| Announced | 2025-09 |
Key facts
- Start of production at Megafactory Texas (Brookshire) announced by Tesla on 2026-08-06; 50 GWh/yr designed capacity
- Drastically simplified thermal bay with 78% fewer connections; proven inverter and fire protection system (Tesla, 2025-09-09)
- Cell supply from the US, Southeast Asia and China (Tesla); supplier not named
- Deliveries start in the second half of 2026 (Tesla)
- Per-unit power, dimensions and weight not published on tesla.com
What Tesla does not publish for this model
These fields are empty because no public datasheet or release states them. That is information too: ask for these numbers before you shortlist.
Cell capacityCell configurationCell supplierDC voltageIngress protectionDimensions (L × W × H)WeightEnergy densityRound-trip efficiencyCycle lifeCalendar lifeWarrantyFire suppression
Price signal
not published
No verified public price yet: Tesla's own configurator has not been independently confirmed for Megapack 3 pricing (unlike Megapack 2 XL, no screenshot/press citation of a configurator quote exists so far). A third-party reseller listing implies ~$167/kWh for a 5 MWh unit, but that is not Tesla's own price and is excluded here per this index's rule that only Tesla's configurator counts as a public price. Production started Aug 6, 2026 at Tesla's new Brookshire, TX Megafactory. Vs. Megapack 2 XL: +28% capacity per unit (5 MWh vs 3.9 MWh), larger 2.8L cells, 78% fewer thermal connections, ~23% faster install, up to 40% lower construction cost.
From the Coloprice BESS Price Index — a benchmark, not an offer. See the index for how each figure was collected. See the BESS Price Index →
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Sourcing quote for Tesla Megapack 3
Coloprice is published by Dream View, a China-sourcing company. For commercial-scale projects we buy BESS containers factory-direct — verified manufacturer, certification review, pre-shipment inspection, export and freight — for a flat 10% fee.
Sources: Tesla on X — Megablock / Megapack 3 (2025-09-09) · Tesla Megapack on X — Megapack 3 SOP (2026-08-06) · Tesla Q3 2025 Update (IR)