Smartstack Battery Storage Platform by Fluence Energy: status and timeline

Milestones

No announced next step

Fluence Energy founded2018Complete.
Smartstack 7.5 MWh platform launchedFeb 2025Complete.
Fluence IPO on NASDAQOct 2021Complete.
Smartstack 10 MWh system launched23 Jun 2026Complete.

Most important updates

Fluence launches Smartstack 10 MWh system with ~680 MWh/acre site density23 Jun 2026

Current obstacles

Manufacturing capacityBattery cell supply and container manufacturing capacity limit deployment growth rates.

Physics limits

Battery energy densityLithium-ion chemistry limits energy density per unit volume, constraining multi-hour systems.

How it works

2 parts

Modular design

Containerized battery pods

Smartstack uses standardized battery modules in containers, enabling rapid deployment and modular scaling.

Software

Fluence OS autonomous control

Fluence OS optimizes charging and discharging schedules based on grid prices and demand forecasts.

Spec sheet

Spec	Smartstack Battery Storage Platform
Smartstack 10 MWh capacity	10 MWh^R (reported)
Site-level energy density	~680 MWh/acre^R (reported)
Fleet availability	99.3%^R (reported)

^R reported by the company

Update log

1 update

Tue 23 Jun

Major: Fluence launches Smartstack 10 MWh system with ~680 MWh/acre site densityPressHardware

About Fluence Energy

The team behind Smartstack Battery Storage Platform

Fluence Energy

Grid-scale battery storage, energy storage software

Fluence Energy is a Siemens and AES joint venture founded in 2018. It develops and deploys grid-scale battery storage systems and AI-enabled software for renewable integration. In 2026, Fluence reported a record 6.4 billion backlog with Smartstack at 75% of orders.

Fluence Energy is the largest independent grid-storage developer in the Western Hemisphere.
The company reported a 6.4 billion backlog in 2026, with Smartstack at 75% of orders.
Fluence operates a dual model: hardware (Smartstack) and software (Fluence OS) for grid optimization.

fluenceenergy.com (opens fluenceenergy.com)Company profile →

Founded: 20188 yrs
Headquarters: United States
Status: Public
Valuation: public
Staff: ~1,712Mar 2026
Last round: IPO · $948M27 Oct 2021
Works in: EnergyGrid storage
Coverage: 1 program · 2 updateslatest 23 Jun 2026checked 11 Oct
Partners: Siemens AGAES Corporation
People: Julian NebredaCEO

Spec

Smartstack Battery Storage Platform

Smartstack 10 MWh capacity

10 MWh^R (reported)

Site-level energy density

~680 MWh/acre^R (reported)

Fleet availability

99.3%^R (reported)