Utility-scale battery storage
Grid-connected systems, often co-located with solar, used for energy shifting, capacity and ancillary services; about 87 GW added worldwide in 2025 (IEA)
6 leading companies in utility-scale battery storage, one segment of energy storage — Battery cells and grid or behind-the-meter storage. 108 GW was added worldwide in 2025, up 40% on 2024 (IEA).
new market segment · researched 2026-11-14
Battery cellsUtility-scale battery storageLong-duration energy storageStorage system integrators & software
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Leading utility-scale battery storage companies
6 companies, with the scale each source states. Scale is the whole company's unless the row says otherwise.
| Company | Where | What they do | Scale |
|---|---|---|---|
| Tesla Energy TSLA ↗ | Austin, United States since 2015 | Megapack (utility-scale) and Powerwall (home) battery storage systems | capacity (energy storage deployed in year): 46.7 GWh (2025) ↗ |
| Fluence Energy FLNC ↗ | Arlington, VA, United States | Integrates utility-scale battery storage systems and provides bidding and optimization software | revenue: 2,262.8 USD millions (fiscal year ended 2025-09-30) (2025) ↗ |
| Sungrow Power Supply 300274.SZ ↗ | Hefei, China since 1997 | Inverters and integrated battery energy storage systems | revenue: 72.25 CNY billions (company total) (2023) ↗ |
| CATL (Contemporary Amperex Technology) 300750.SZ ↗ | Ningde, China since 2011 | Lithium-ion battery cells and systems for EVs and energy storage | revenue: 423.7 CNY billions (2025) ↗ |
| BYD 1211.HK ↗ | Shenzhen, China since 1995 | Makes vehicles and batteries, including its own cells and energy storage systems. Scale shown is revenue for the whole group. | revenue: 804 CNY billions (group, all segments) (2025) ↗ |
| Eos Energy Enterprises EOSE ↗ | Pittsburgh, PA, United States | Zinc-based battery storage systems for grid use; a non-lithium alternative | revenue: 114.2 USD millions (2025) ↗ |
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The energy storage market
The whole market this segment sits in.
installed capacity (annual battery storage additions, utility-scale + behind-the-meter) · world108
↗GW · 2025
Growth, segments, risks and every company in energy storage →
Quick answers
- What is utility-scale battery storage?
- Grid-connected systems, often co-located with solar, used for energy shifting, capacity and ancillary services; about 87 GW added worldwide in 2025 (IEA). It is one segment of the energy storage market.
- Who are the leading utility-scale battery storage companies?
- Tesla Energy (United States), Fluence Energy (United States), Sungrow Power Supply (China), CATL (Contemporary Amperex Technology) (China), BYD (China), Eos Energy Enterprises (United States).
- Which utility-scale battery storage companies are publicly traded?
- Fluence Energy (FLNC), Sungrow Power Supply (300274.SZ), CATL (Contemporary Amperex Technology) (300750.SZ), BYD (1211.HK), Eos Energy Enterprises (EOSE).
- How big is the energy storage market?
- For the whole energy storage market, not this segment alone: installed capacity (annual battery storage additions, utility-scale + behind-the-meter) (world) 108 GW, 2025 — International Energy Agency.