---
format: "aidr-story-markdown/v1"
id: "b5c5a6b0067b06d97394c141e014cbe65addf4eb516da49bdb5f924245f1c96c"
canonical_url: "https://aidr.today/b5c5a6b0?lang=en"
title: "Tesla Builds Largest US Grid Battery Using 720 Megapacks for xAI"
lang: "en"
requested_lang: "en"
available_langs: ["en","vi"]
translation_fallback: null
fallback_fields: []
published_at: "2026-09-12T05:48:38.000Z"
category: "Infra"
topics: ["xai","tesla","chips","infra","energy"]
source_urls: ["https://huggingnews.com/ai/tesla-builds-largest-us-grid-battery-using-720-megapacks-for-xai-c86c38a0","https://x.com/Kalshi/status/2098625650102026455","https://x.com/0xzxcom/status/2098627273062818068","https://x.com/bert_gilfoyle/status/2098591674973012409"]
summary: "Tesla deployed a grid-connected battery system at xAI's Colossus 2 data center in Memphis that provides storage capacity between 2.8 and 3.3 GWh. The installation utilizes 720 Megapacks to deliver 720 MW to 1.4 GW of power output to backstop the facility's GPU-heavy operations, marking the largest such system in the US. The site charges during off-peak hours to discharge during demand spikes, reducing reliance on temporary natural gas turbines. xAI and SpaceX invested roughly $1 billion in the Megapacks and related equipment from 2024 to mid-2026. The Tennessee Valley Authority board granted approval for a direct grid connection to the Memphis facility in August 2026 to support the energy storage project."
---

# Tesla Builds Largest US Grid Battery Using 720 Megapacks for xAI

> [Open the canonical story](<https://aidr.today/b5c5a6b0?lang=en>)

**Published:** 2026-09-12T05:48:38.000Z
**Category:** Infra
**Topics:** xai, tesla, chips, infra, energy

## Summary

Tesla deployed a grid\-connected battery system at xAI's Colossus 2 data center in Memphis that provides storage capacity between 2\.8 and 3\.3 GWh\. The installation utilizes 720 Megapacks to deliver 720 MW to 1\.4 GW of power output to backstop the facility's GPU\-heavy operations, marking the largest such system in the US\. The site charges during off\-peak hours to discharge during demand spikes, reducing reliance on temporary natural gas turbines\. xAI and SpaceX invested roughly $1 billion in the Megapacks and related equipment from 2024 to mid\-2026\. The Tennessee Valley Authority board granted approval for a direct grid connection to the Memphis facility in August 2026 to support the energy storage project\.

## Sources

- [Story source](<https://huggingnews.com/ai/tesla-builds-largest-us-grid-battery-using-720-megapacks-for-xai-c86c38a0>)
- [Story source](<https://x.com/Kalshi/status/2098625650102026455>)
- [Supporting source](<https://x.com/0xzxcom/status/2098627273062818068>)
- [Supporting source](<https://x.com/bert_gilfoyle/status/2098591674973012409>)