A flywheel energy storage system functions like a mechanical battery, storing energy in the motion of a spinning mass. This is similar to how a potter's wheel or a spinning top holds energy while in motion.
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Batteries are the most scalable type of grid-scale storage and the market has seen strong growth in recent years. Other storage technologies include compressed air and gravity storage, but they play a comparatively small role in current power systems.
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Fluence Energy (NASDAQ: FLNC) is the global leader in grid-scale battery storage, born from a Siemens/AES joint venture and now independent. 3 billion in FY2025 revenue and is guiding $3.
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This roundup pulls back the curtain on the top 5—Tesla's scaling like a overcaffeinated startup, Sungrow's nailing the mid-sized sweet spot, Fluence's AI is basically a energy storage genius, Maxbo Solar is out here customizing like a tailor for your power needs, and BYD's safety.
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