Tesla · utility-scale
Tesla Megablock
announcedmodular blockAC block (PCS integrated)liquid-cooledLFPBNEF Tier 1
Everything below comes from what Tesla publishes about the Megablock: 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 |
|---|---|---|---|
| 20 MWh AC (4 x Megapack 3 + MV transformer and switchgear) | 20 MWh | not published | not published |
Specifications
| Cell chemistry | LFP |
|---|---|
| Cell capacity | not published |
| Cell configuration | not published |
| Cell supplier | not published |
| Form factor | modular block |
| 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 | 91% |
| Cycle life | 10,000 · "Designed for 20 MWh AC, 25-year life & >10,000 cycles" (Tesla on X, 2025-09-09); test conditions not published |
| Calendar life | 25 y |
| Warranty | not published |
| Fire suppression | not published |
| Generation | 2025 |
| Announced | 2025-09 |
Key facts
- Pre-engineered medium-voltage block: four Megapack 3 units with integrated transformer and switchgear
- 91% round-trip efficiency at medium voltage, inclusive of auxiliary loads
- Ambient operating temperature -40 C to 60 C
- 23% faster to install, up to 40% lower construction costs; 248 MWh AC per acre site density (Tesla claims)
- Deliveries start in the second half of 2026 (Tesla); production at Megafactory Texas
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 densityWarrantyFire suppression
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Sourcing quote for Tesla Megablock
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 announcement (2025-09-09) · Tesla Q2 2026 Update (IR)