FlexGen

Markets behind-the-meter batteries on HybridOS that discharge into demand peaks at data centers (ESS News).

FlexGen closed the Powin key-asset and IP acquisition in August 2025 and now supports more than 25 GWh of storage globally, including the former Powin fleet. The deployed column stays empty because 25 GWh is a supported fleet, not FlexGen-built capacity.

Sources for these notes

Type Editorial supply-chain classification based on the sourced portfolio: system integrator, cell manufacturer, non-lithium or mechanical storage developer, power equipment group, or software and controls supplier.

Integrator 1

Chemistry Main storage chemistry of the flagship product. LFP is lithium iron phosphate; NMC is lithium nickel manganese cobalt oxide; LTO is lithium titanate. Mechanical covers gravity, compressed air and CO2 stores. Mixed means the vendor sells more than one chemistry at scale.

Not published

Flagship product The vendor's main grid-scale or commercial storage product line, as the vendor names it.

HybridOS-controlled BESS 2

Energy per unit MWh Energy of one flagship unit (usually a 20-ft container or one enclosure), as the vendor publishes it. Rating basis (usable or nameplate, beginning of life) is in the spec notes.

Not published

Duration Discharge durations the vendor offers at rated power, in hours, as published (for example 2-4 h, or 100 h).

Not published

Deployed GWh Cumulative storage the vendor says it has deployed, delivered or shipped, in GWh, at the date of the cited source. Shipments and installed capacity differ; the spec notes say which one the vendor reports.

Not published

Deployed + contracted GWh Deployed plus contracted or awarded storage (backlog under contract) in GWh, as the vendor states it. Blank when the vendor publishes no contracted figure.

Not published

Cycle life cycles Rated cycle life of the flagship cell or system as the vendor publishes it. Test conditions (temperature, depth of discharge, end-of-life capacity) differ by vendor and are in the spec notes.

Not published

Warranty years Longest standard product or performance warranty term the vendor publishes for the flagship system, in years.

Not published

UL 9540 The vendor states a named system in this record is certified or listed to UL 9540. The spec notes identify any earlier product or model-specific scope.

Not published

UL 9540A A cited manufacturer statement or published report describes UL 9540A testing for a named system or cell in the record. Read the spec notes for the model and test level; this is not a blanket certification of all products.

Not published

Data center offer The vendor markets a storage product, reference or program for data centers: backup, UPS, grid-interactive UPS, load smoothing for AI training, or bridging power while a grid connection is built.

Yes 2

Parent Owner or parent group when the provider is a subsidiary or joint venture.

Not published

Products Named storage products and cells, with sizes where published.

HybridOS energy management software; integrated BESS; Powin hardware and software IP and spare parts (acquired 2025) 1

Market status Dated ownership, deal or operating context: joint ventures, acquisitions and manufacturing agreements.

Not published

Services Published integration, controls or lifecycle services offered by the provider.

Not published

Reference project A named project and its reported status and capacity. Project capacity is not a product unit rating.

Not published

Headquarters Headquarters city and country only when an explicit cited company statement supports the location.

Not published

1. FlexGen completes acquisition of Powin assets accessed 2026-11-11
2. ESS News: FlexGen's HybridOS turns batteries into grid thinkers accessed 2026-11-11
3. Energy-Storage.news: FlexGen wants to uphold Powin's legacy accessed 2026-11-11
4. FlexGen: court approval of Powin assets acquisition accessed 2026-11-11
5. FlexGen 2025 recap and 2026 outlook accessed 2026-11-11