Manufacturer · United States
Fluence
BNEF Tier 1Fluence (Nasdaq: FLNC, formed by Siemens and AES) integrates grid-scale battery systems: the AC-based modular Smartstack (7.5 / 10 MWh), the DC-block Gridstack Pro (2000 / 5000 Series) and the legacy cube-based Gridstack, all run on Fluence OS; strong in the US, Europe and Australia.
- Country
- United States
- Headquarters
- Arlington, Virginia
- Founded
- 2018
- Official website
- fluenceenergy.com
- Segments
- utility-scale
- Makes its own cells
- no
- BNEF Tier 1
- BNEF Tier 1 (bankability list)
Model
4
4 models
Classes represented
5 MWh 20 ft containersAC blocks (PCS integrated)Liquid-cooled utility systemsLong-duration systems (8 h+)Non-LFP chemistry
Fluence models in the catalog
Sorted by maximum published energy. Click a model for all variants, the full specification and the list of fields Fluence does not publish.
| Model | Segment | Form factor | Max energy | Max power | Cooling | Chemistry | Cell Ah | AC/DC | Status | Datasheet |
|---|---|---|---|---|---|---|---|---|---|---|
| Smartstack | utility-scale | modular block | 10 MWh | not published | liquid-cooled | LFP | not published | AC | shipping | |
| Gridstack Pro 5000 Series | utility-scale | 20 ft container | 5.644 MWh | not published | liquid-cooled | LFP | not published | DC | shipping | |
| Gridstack Pro 2000 Series | utility-scale | 40 ft container | 2.436 MWh | not published | liquid-cooled | LFP | not published | DC | shipping | |
| Gridstack (Fluence Cube) | utility-scale | modular block | not published | not published | not published | not published | not published | DC | legacy |
About Fluence
Fluence is a system integrator: it designs battery packs, modules, BMS, enclosures and the Fluence OS controls, and buys LFP cells from several OEMs. Current line-up: Smartstack, an AC-based split architecture (Smart Skid with PCS, cooling and controls plus stackable battery pods) in 7.5 MWh and 10 MWh pack options, 2–8 h durations, 690 V AC output, IP55, -30 to +55 C, liquid cooled, UL 9540A / UL 9540 / NFPA 68/69 / IEC 62933; manufacturing started in Vietnam in September 2025 with deliveries from Q4 2025. Gridstack Pro is a liquid-cooled DC block: 2000 Series (2,436 kWh, 40 ft-class enclosure) and 5000 Series (4,872–5,016 kWh with 3XX Ah cells or 5,644 kWh with 5XX Ah cells, 20 ft-class), >87% RTE, IP55, -20 to +50 C. A US domestic-content configuration uses AESC 305 Ah LFP cells from Tennessee and modules built in Utah. Legacy Gridstack (Fluence Cube, air or liquid cooled) is still listed. Not disclosed: cell suppliers beyond AESC, cell configuration, per-variant AC power for Smartstack, cycle life, warranty terms and Smartstack RTE; brochures state that specifications are design estimates only.
Photo policy
Fluence provides press-kit imagery under press terms; model cards show those photos with credit and a link to the source.
Media Kit page (fluenceenergy.com/about/media-kit/): "The Fluence media kit offers downloadable brand materials, company facts, executive bios, logos, images, and messaging resources to support accurate and consistent media coverage. Designed for reporters, partners, and event organizers..." Product Images section is labelled "Credit: Fluence". No explicit licence text; "Our logo files and detailed brand guidelines are available upon request. Please email branding@fluenceenergy.com".
Sources
Manufacturer documents used for this record. Model-level sources are listed on each model card.
- Fluence — Energy Storage Technology — https://fluenceenergy.com/energy-storage-technology/
- Fluence — Media Kit — https://fluenceenergy.com/about/media-kit/
- Fluence — Media Room — https://fluenceenergy.com/about/media-room/
- Fluence — Domestic Content — https://fluenceenergy.com/domestic-content/