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There's no single authoritative ranking of BESS buyers, and "buyer" can mean a few different things. Here's how the main groups break down, based on what I found and general market knowledge.

Acquirers of development-stage and operating projects (IPPs and strategic owners)

• NextEra Energy Resources is the largest US storage owner and builder, and it develops much of its own pipeline.
• AES buys and owns large solar-plus-storage projects. It acquired the Bellefield project from developer Avantus, with Alberta Investment Management Corporation providing part of the financial backing. blackridgeresearch
• Energy Vault is an active acquirer of late-stage projects. It recently bought a portfolio of more than 2.3 GW across 15 US BESS development projects from Goshe Energy Storage. power-technologysec
• Others regularly active in US storage include Plus Power, Key Capture Energy (SK), Jupiter Power, Engie, Vistra, NRG, Intersect Power, Arevon, and Calpine.

Financial and infrastructure investors

• Large funds such as Brookfield, KKR, Blackstone, Macquarie, and Ares, and pension-backed investors like AIMCo, tend to buy operating or construction-ready assets.