FlexGen
FlexGen designs and operates HybridOS, a hardware-agnostic battery energy storage energy management software platform, sold with integration, commissioning, and lifecycle services to utilities, IPPs, developers, data centers, and municipalities.
- Company typePrivate
- Founded2009
- HeadquartersDurham, United States
- Headcount101–250
- GTM typeB2B
- OfferingSoftware
What FlexGen does
FlexGen Power Systems, LLC is a Durham, North Carolina-based energy storage software and integration company founded in 2009 that designs, operates, and continuously improves a hardware-agnostic battery energy management platform branded HybridOS. The platform combines a Linux-based Energy Management System with three software modules (HybridOS EMS, HybridOS Analyze analytics built on machine learning and a Digital Twin performance index, and a US-engineered HybridOS Control BMS) and was extended in 2025 with a Solar Power Plant Controller that enables co-optimization of solar and storage assets from a single interface. FlexGen wraps the software with Activation Services (systems engineering, hardware procurement, pre-integration in an in-house Innovation Lab, and a "one-touch" commissioning process claimed to be 70% faster than industry average) and Lifecycle Services anchored on two 24/7 NERC-compliant Remote Operations Centers in Durham, NC and Houston, TX, plus an EMS Retrofit offering that targets underperforming competitor sites.
FlexGen sells to utilities, independent power producers, energy storage developers, EPCs, municipalities and electric co-ops, and data center operators, with named utility deployments including Alliant Energy (700 MWh in Wisconsin and Iowa) and Northeastern REMC, and active pursuit of hyperscale AI data center customers facing 4-8 year interconnection queues. The company monetizes through a mix of hardware procurement and turnkey BESS integration, HybridOS software licensing (including via Retrofit), Long-Term Service Agreements, and project-based professional services, with quote-based enterprise pricing sized by MW, duration, ISO/region, and use case. The portfolio now spans 25+ GWh and 200+ systems across 10+ countries, expanded materially through the 2025 acquisition of Powin's business assets and the April 2026 acquisition of Clean Energy Services (CES), which added FEOC-compliant Authorized Service Provider coverage, a Houston ROC, and a European market entry across the UK, Ireland, France, Spain, Poland, and Germany. Apollo Global Management is a significant institutional equity holder following a $150 million commitment in 2021, and J.P. Morgan-led debt capacity supports continued growth.
FlexGen firmographics
Firmographics- Name
- FlexGen
- Legal name
- FlexGen Power Systems, LLC
- Website
- https://flexgen.com
- Company type
- Private
- Founded year
- 2009
- Operating status
- Operating
- Headcount range
- 101–250 employees
- Short description
- FlexGen designs and operates HybridOS, a hardware-agnostic battery energy storage energy management software platform, sold with integration, commissioning, and lifecycle services to utilities, IPPs, developers, data centers, and municipalities.
- Ownership category
- akta.pro rank
FlexGen industry classification
Industry- Product category
- Energy Storage Software
- NAICS
- Motor and Generator Manufacturing (335312)
- SIC
- Services-Computer Programming Services (7371)
- akta.pro primary industry
- SCADA/Telemetry, Data Integration & Device Connectivity for Storage/DER Control (EUAFAKAI)
- akta.pro secondary industries
- Ancillary Services Aggregation & Bidding Optimization (DER/VPP participation) (EUAFALAJ), Lifecycle Analytics, LCA & Circularity Consulting (Footprinting, Material Flow Analysis) (EUAFACAK), Testing, Grading & State-of-Health (SoH) Diagnostics (EOL Assessment, Certification) (EUAFACAH)
Keywords
Where FlexGen is headquartered
LocationHeadquarters
- HQ city
- Durham
- HQ country
- United States
- HQ region
- North America
Markets served
FlexGen business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Operations, Marketing or Sales, Infrastructure
Revenue model
- Hardware procurement and BESS integration: FlexGen designs, procures, constructs, and integrates energy storage projects as a turnkey solution, sourcing batteries, PCS, and BOS components through in-country supply chain teams with hardware-agnostic procurement.
- HybridOS software licensing: Recurring and project-based licensing of the HybridOS energy management platform, including HybridOS EMS, HybridOS Analyze analytics, HybridOS Control BMS, and the HybridOS Solar PPC. Software licenses bundled with project deployments and sold via Retrofit programs.
- Lifecycle services and managed operations: Long-Term Service Agreements covering 24/7 ROC monitoring, preventative maintenance, augmentation management, warranty management, spare parts coordination, and performance guarantees delivered via two ROCs in Durham, NC and Houston, TX.
- Activation and commissioning services: Professional services including systems engineering, procurement, integration, one-touch commissioning, on-site client training, and project-based consulting engagements.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | — | Quote-based project pricing for BESS hardware, integration, and software |
| Outcome Based/ Performance | — | Financial Impact Calculator and consultation-based revenue modeling |
| Subscription | — | HybridOS software licensing with EMS Retrofit program |
Go-to-market motion5 records
Distribution channels5 records
Marketing channels11 records
FlexGen product offering
Product offeringCore offering
FlexGen develops and sells HybridOS, a hardware-agnostic battery energy storage management software platform used to operate, optimize, and monitor grid-scale, microgrid, and behind-the-meter energy storage systems. The company complements the software with system integration, commissioning, and lifecycle services for utility, IPP, developer, and data center customers deploying utility-scale and C&I storage assets.
Product overview
FlexGen delivers a single integrated platform-plus-services portfolio for utility-scale battery energy storage. The core offering is the HybridOS energy management system, a hardware-agnostic software platform available in three modules — HybridOS (EMS with power plant controller and SCADA), HybridOS Analyze (machine-learning analytics with a Digital Twin), and HybridOS Control BMS (US-engineered battery management system) — that together orchestrate batteries, solar, and hybrid assets across single sites and fleets. FlexGen wraps the software with three core service lines: Activation Services for hardware integration and one-touch commissioning, Lifecycle Services for long-term 24/7 monitoring through the Remote Operations Center in Durham, NC, and EMS Retrofit Solutions for upgrading legacy systems. Vertical-specific offerings (Data Center Solutions, De-Risking Services, Analytical Site Assessment) extend the platform, while acquired capabilities from Clean Energy Services (CES, April 2026) and Powin's assets (August 2025) add field service depth, expanded geographic reach (now including Europe), and a broader OEM partner program.
Differentiator
Problem solved
Functional benefit
Brands
- HybridOS: FlexGen's proprietary hardware-agnostic energy management system (EMS) platform, encompassing HybridOS EMS, HybridOS Analyze, HybridOS Control BMS, and HybridOS Solar PPC, used to control and optimize battery energy storage systems and hybrid energy sites.
Products and services
- HybridOS Hardware-agnostic battery energy storage management software platform that operates, optimizes, and monitors grid-scale, microgrid, and behind-the-meter storage systems for utilities, IPPs, developers, and data center operators.
- HybridOS Analyze Analytics software module that provides performance, health, and revenue analytics for battery storage assets operating under HybridOS.
- HybridOS Control BMS Battery management system software that performs low-level monitoring and control of battery cells, modules, and packs across multiple chemistries.
- Solar PPC (Power Plant Controller) Power plant controller software that coordinates utility-scale solar PV generation with co-located battery storage and grid dispatch instructions.
- Storage Integration and Lifecycle Services Integration, commissioning, and lifecycle support services delivered alongside HybridOS to deploy and operate customer battery storage assets.
Quantifiable outcome
- 98% BESS availability vs. ~93% from competitors
- +7 more outcomes
Companies that use FlexGen
Customer profileNamed customers3 records
Segments7 records
Ideal customer profiles3 records
FlexGen technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration1 record
AI capability7 records
Feature7 records
FlexGen partnerships and signals
Strategic signalPartnerships
Five partnerships are on record, tiered flagship and core.
- Clean Energy Services (CES)flagshipFlexGen acquired Clean Energy Services (CES) in April 2026, integrating CES's commissioning and lifecycle service teams, authorized service provider (ASP) relationships across major OEMs, and Houston-based Remote Operations Center. CES services over 1 GW of solar and 4.5 GWh of battery assets and has commissioned over 15 GWh of battery sites, giving FlexGen a full-stack FEOC-compliant offering for OEMs and customers.
- Global battery OEMs (30+) and US battery companies (20+)coreFlexGen maintains hardware-agnostic relationships with over 30 global OEMs and more than 20 U.S.-based battery companies across multiple chemistries, supporting FEOC-compliant and non-FEOC supply options for 2026-2027 BESS projects.
- Powin EnergyflagshipFlexGen acquired significant business assets from Powin (intellectual property, hardware, software, IT systems, and spare parts inventory) following U.S. Bankruptcy Court approval. The acquisition added over 14.5 GWh of battery energy storage projects, expanding FlexGen's portfolio to 25+ GWh and 200+ projects across 10 countries.
- Eos Energy EnterprisescoreEos Energy Enterprises partnered with FlexGen Power Systems in December 2024 to develop integrated stationary storage solutions combining Eos's zinc battery technology with FlexGen's HybridOS energy management software platform.
- Amazon Web Services (AWS)coreFlexGen and AWS co-developed an AI assistant to streamline workflows, highlighted in the Innovation Ambassadors podcast series. AWS is also referenced among key AI-in-renewable-energy market players adopting AI for smart grid management.
Scale indicators14 records
Recent moves7 records
Expansion highlights7 records
FlexGen competitors and assessment
Company assessmentDirect peers
- Stem Inc: Stem offers AI-driven energy storage optimization software and virtual power plant services, competing with HybridOS Analyze and the broader HybridOS platform for behind-the-meter and front-of-meter storage customers.
- Power Factors: Power Factors offers asset management, SCADA, and PPC software for renewable energy plants, including solar and storage, competing with the HybridOS platform for developer, IPP, and asset-owner budgets on hybrid projects.
- Fluence: Fluence is the closest direct peer, offering a hardware-agnostic utility-scale BESS platform anchored by the Mosaic EMS, with global deployments, lifecycle services, and direct competition for the same utility, IPP, and developer customers that FlexGen targets.
- Wärtsilä Energy Storage (GridSolv Quantum): Wärtsilä delivers GridSolv Quantum BESS solutions with its GEMS hybrid energy management software, directly comparable to FlexGen's HybridOS offering to utilities and IPPs across multiple global markets.
- AlsoEnergy: AlsoEnergy provides a power asset performance monitoring and PPC platform spanning solar and storage, directly comparable to HybridOS Solar PPC and Analyze for hybrid plant operators, developers, and EPCs.
Emerging players
- EnergyHub: EnergyHub provides a DERMS platform for utilities aggregating distributed energy resources, partially overlapping with FlexGen's ancillary services aggregation and multi-market optimization for utility customers.
- Nuvve Holding Corp: Nuvve focuses on vehicle-to-grid aggregation and distributed energy storage software, representing an emerging overlap with FlexGen's ancillary services and VPP participation capabilities in adjacent flexibility markets.
- Sunverge Energy: Sunverge delivers a behind-the-meter intelligent energy storage and DERMS platform, representing an emerging adjacent peer targeting the C&I and residential flexibility markets that increasingly intersect with FlexGen's data center and VPP ambitions.
Broad incumbents
- Sungrow: Sungrow is a major global BESS and PCS incumbent increasingly bundling its own EMS and energy management features, representing competitive pressure on FlexGen's hardware-agnostic software layer in C&I and utility-scale markets.
- Tesla Energy (Megapack / Autobidder): Tesla Energy supplies Megapack BESS hardware bundled with Autobidder, an energy trading and optimization platform. While primarily a hardware incumbent, it competes with FlexGen on large utility-scale projects and increasingly bundles software, which directly pressures FlexGen's hardware-agnostic positioning.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key risks6 records
Key highlights7 records
Customer concentration
FlexGen social profiles
Digital presenceFlexGen compliance and trust
Trust signalCompliance5 records
FlexGen financial estimates
Financial estimateRevenue estimate
Valuation estimate
FlexGen leadership team
Management profileNumber of profiles
FlexGen subsidiaries and ownership
Company hierarchySubsidiaries1 record
FlexGen funding detail
Funding detailFunding overview
Funding rounds5 records
Investors6 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
FlexGen M&A and investment
M&A and investmentM&A3 records
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about FlexGen
What does FlexGen do?
FlexGen develops and sells HybridOS, a hardware-agnostic battery energy storage management software platform used to operate, optimize, and monitor grid-scale, microgrid, and behind-the-meter energy storage systems. The company complements the software with system integration, commissioning, and lifecycle services for utility, IPP, developer, and data center customers deploying utility-scale and C&I storage assets.
Is FlexGen a public or private company?
FlexGen is a private company. It is classified as private equity controlled and is currently operating.
When was FlexGen founded?
FlexGen was founded in 2009. It employs 101 to 250 people.
Where is FlexGen based?
FlexGen is headquartered in Durham, United States, in the North America region.
How does FlexGen make money?
Four revenue lines are on record. Hardware procurement and BESS integration is the primary driver. The others are hybridOS software licensing, lifecycle services and managed operations and activation and commissioning services.
Who are FlexGen's main competitors?
Direct peers on record are Stem Inc, Power Factors, Fluence, Wärtsilä Energy Storage (GridSolv Quantum) and AlsoEnergy. Emerging players are EnergyHub, Nuvve Holding Corp and Sunverge Energy. Broad incumbents are Sungrow and Tesla Energy (Megapack / Autobidder).
Does FlexGen have an API?
No public API is recorded for FlexGen.
What industry is FlexGen in?
FlexGen's product category is Energy Storage Software. Its primary akta.pro industry code is EUAFAKAI, SCADA/Telemetry, Data Integration & Device Connectivity for Storage/DER Control, with a secondary code of EUAFALAJ, Ancillary Services Aggregation & Bidding Optimization (DER/VPP participation). Its NAICS code is 335312 and its SIC code is 7371.