Short answer: NextEra Energy Resources owns the most operating battery storage in the US, with about 5,341 MW, followed by ENGIE at about 3,426 MW and AES at about 2,885 MW. The ten largest owners hold about 22.2 GW between them, according to Enerdatics, which tracks 1,087 operating utility-scale battery projects in the US.
How Enerdatics solves this
Enerdatics tracks who your competitors advise, buy from, build for, supply and fund. Company profiles pull every deal, project and financing into one view, updated as new records land. Battery fleets change hands fast, and Enerdatics shows who owns each storage site today, who is building the next wave and who just bought a platform, so you can reach owners and buyers before the next sale or refinancing goes to market. Enerdatics tracks 72 US battery storage M&A deals announced since January 2024. Available through CoreData, Stack dashboards, Leap AI and API.
Key takeaways
- NextEra Energy Resources is the largest owner of operating US battery storage, with about 5,341 MW across 65 projects in Enerdatics data.
- The ten largest owners hold about 22.2 GW, or roughly 37% of the operating US battery capacity in the same ranking, so the market is still fragmented.
- California (CAISO) and Texas (ERCOT) together hold about 40.6 GW of the 57.4 GW of operating utility-scale US batteries that Enerdatics tracks.
- The next ranking will look different: owners such as Intersect Power, IPX Power and Clenera lead the 20.8 GW of US battery capacity now in construction.
- Ownership shifts through M&A as well as new builds, and Enerdatics records 72 US battery storage deals announced since January 2024.
Which companies own the most battery storage in the US?
A small group of large independent power producers and storage specialists owns the biggest operating fleets. An independent power producer (IPP) is a company that owns plants and sells their output, rather than a regulated utility that serves its own customers.
Enerdatics ranks owners by the capacity of operating battery projects they hold today. Capacity here means power output in megawatts (MW), not energy stored in megawatt hours (MWh). NextEra Energy Resources leads with about 5,341 MW. ENGIE follows with about 3,426 MW and AES with about 2,885 MW. Terra-Gen, Plus Power and Vistra each hold between 1.6 GW and 1.9 GW.
The list mixes two types of owner. Some are diversified IPPs that add batteries beside solar and wind, such as NextEra, AES, Enel and Clearway. Others are storage specialists that built their business around batteries, such as Plus Power, Arevon and Jupiter Power.
The market is less concentrated than the top of the list suggests. The top ten hold about 22.2 GW, roughly 37% of the operating capacity in the same ranking. That leaves most of the market spread across dozens of mid-sized owners and private funds. For context on how a similar ranking looks in solar, see which companies own the most solar in the US.
How fast is US battery ownership growing?
Battery fleets are growing faster than almost any other power asset. The US Energy Information Administration reported that developers added 10.4 GW of utility-scale battery capacity in 2024, taking the national total above 26 GW, and that operators planned about 19.6 GW more for 2025.
Enerdatics now tracks 1,087 operating utility-scale battery projects in the US, with about 57.4 GW of capacity. Another 150 projects with about 20.8 GW are in construction. Behind those sit about 100 GW of late-stage projects, meaning projects with key permits or grid agreements in place but not yet built.
This growth matters for anyone tracking rivals. A ranking of today's owners is a snapshot. The owners building the most now will move up the list within two to three years.
Where are the largest battery fleets located?
Most operating US battery capacity sits in two power markets. A power market, or ISO, is the regional grid operator that runs wholesale electricity trading, such as CAISO in California and ERCOT in Texas.
Enerdatics records about 21.8 GW of operating batteries in CAISO and about 18.8 GW in ERCOT. Together that is about 71% of tracked utility-scale capacity. Projects outside an ISO add another 12.3 GW. PJM, MISO, ISO-NE, NYISO and SPP hold much smaller fleets so far.
That geography explains the ranking. Owners with early, large positions in California and Texas, such as NextEra, Terra-Gen, Plus Power and Jupiter Power, sit near the top. The table further down lists the full top ten with project counts.
Who will own the most battery storage next?
The build pipeline points to a different top ten within a few years. In construction, Enerdatics ranks Intersect Power first with about 1,547 MW across five projects, followed by a 1,200 MW project owned by Amazon and about 1,150 MW owned by IPX Power. Clenera, Copia Power, DESRI, Invenergy and ENGIE complete the top eight.
M&A is the other route to the top. Platform sales can move several gigawatts in one deal. Brookfield's agreement to buy Aypa Power is one example, covered in our note on the Brookfield and Aypa deal. Smaller asset sales also reshape fleets, as our analysis of Nofar USA's purchase of an Ormat battery project shows. For how owners and developers rank across solar, see the pillar guide to the largest solar developers in the US.
| Rank | Owner | Operating battery capacity (MW) | Projects |
|---|---|---|---|
| 1 | NextEra Energy Resources | 5,341 | 65 |
| 2 | ENGIE | 3,426 | 49 |
| 3 | AES Corp | 2,885 | 75 |
| 4 | Terra-Gen | 1,863 | 25 |
| 5 | Plus Power | 1,655 | 10 |
| 6 | Vistra | 1,611 | 9 |
| 7 | Enel | 1,518 | 72 |
| 8 | Clearway Energy | 1,450 | 19 |
| 9 | Arevon Energy | 1,270 | 8 |
| 10 | Jupiter Power | 1,195 | 12 |
Source: Enerdatics Leap, US projects dataset (operational battery storage, current owner), November 2026.
Enerdatics' data shows that project counts and capacity tell different stories. AES owns 75 operating battery projects, more than NextEra's 65, but its fleet is about 2.5 GW smaller because many of its sites are small. Plus Power reaches 1,655 MW with only 10 projects, an average of about 166 MW per site.
Frequently asked questions
Who is the largest owner of battery storage in the US? NextEra Energy Resources is the largest, with about 5,341 MW of operating battery capacity in Enerdatics data. ENGIE and AES rank second and third.
How much battery storage is operating in the US? Enerdatics tracks about 57.4 GW of operating utility-scale battery capacity across 1,087 projects. Another 20.8 GW is in construction.
Which state has the most battery storage? California has the largest fleet, with about 21.8 GW in CAISO, and Texas follows with about 18.8 GW in ERCOT. Together they hold about 71% of tracked capacity.
Does the ranking use MW or MWh? The ranking uses power capacity in MW. Energy capacity in MWh depends on battery duration, which varies by project.
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