# FlexGen Power Systems

> FlexGen Power Systems is a Durham, North Carolina energy storage technology company founded in 2009.
> It designs, integrates and operates grid-scale battery energy storage systems (BESS) and the software
> that runs them — principally HybridOS, a hardware-agnostic energy management system (EMS) for
> multi-source, multi-site battery and solar portfolios.

This file was GENERATED by API Evangelist from the public FlexGen surface on 2026-08-16.
FlexGen does not publish an llms.txt of its own (https://www.flexgen.com/llms.txt returns 404).

## API status

FlexGen states on its own product pages that HybridOS offers "automated APIs" and, as of the 2026
release, "historian data API access". **No public developer portal, API reference, or machine-readable
specification is published.** As of 2026-08-16:

- No OpenAPI, Swagger, AsyncAPI, GraphQL SDL, MCP server, or A2A agent card was found.
- `api.flexgen.com`, `docs.flexgen.com`, `developer.flexgen.com` and `developers.flexgen.com` do not
  resolve in DNS.
- `/openapi.json`, `/openapi.yaml`, `/swagger.json`, `/api-docs` and `/llms.txt` all return 404 on
  `www.flexgen.com`.
- Every `/.well-known/` path returns 404 on `www.flexgen.com`; the HTTP 200s on `portal.flexgen.com`
  and `trust.flexgen.com` are single-page-app catch-all HTML shells, not documents.

The HybridOS API surface is reached through customer deployments and the login-gated customer portal
at `portal.flexgen.com`. Treat FlexGen as having a **customer-only API**: real, but not publicly
documented.

## Products

- [HybridOS Energy Management System](https://www.flexgen.com/software/hybridos-energy-management-system): Hardware-agnostic EMS for multi-source, multi-site battery and solar energy management; instantaneous monitoring, web-based controls, automated APIs, historian data API access, integrated market prices, fleet-view mobile app.
- [HybridOS Control BMS](https://www.flexgen.com/software/hybridos-control-bms): US-built battery management system supporting numerous battery chemistries and manufacturer configurations, with pre-validated configurations for streamlined commissioning.
- [Solar Power Plant Controller (PPC)](https://www.flexgen.com/solar-power-plant-controller-ppc): Plant controller supporting Modbus, DNP3, CAN and synchrophasor protocols.
- [EMS Retrofit](https://www.flexgen.com/solutions/ems-retrofit): Replacement of an incumbent EMS on an existing storage site.
- [Data Center Solutions](https://www.flexgen.com/solutions/data-center-solutions): Battery storage for data-center interconnection and power.

## Services

- [Activation Services](https://www.flexgen.com/services/activation-services)
- [Lifecycle Services](https://www.flexgen.com/services/lifecycle-services)

## Integration surface

FlexGen's published integration surface is **industrial protocols, not web APIs**: Modbus, DNP3, CAN
and synchrophasor are named on the power plant controller page. FlexGen's GitHub organization
(`github.com/flexgen-power`) maintains a fork of the Go OPC UA library, indicating OPC UA is also in
the stack. No REST/GraphQL/event contract is published.

## Company

- [Home](https://www.flexgen.com/)
- [About](https://www.flexgen.com/about)
- [Contact](https://www.flexgen.com/contact-us)
- [Careers](https://www.flexgen.com/careers)
- [Blog](https://www.flexgen.com/resources/blog)
- [News](https://www.flexgen.com/resources/news)
- [Privacy Policy](https://www.flexgen.com/privacy)
- [Trust Center](https://trust.flexgen.com/) — Vanta-hosted; certification list renders client-side and is not machine-readable anonymously.
- [Customer Portal](https://portal.flexgen.com/) — login required.
- [GitHub](https://github.com/flexgen-power) — 2 public repositories, both forks of upstream Go libraries.

## Certifications

- **ISO 9001:2015** — announced 2026-07-29, covering "the design, development, deployment, and remote
  software support of the HybridOS energy management system software platform".
  [Announcement](https://www.flexgen.com/resources/blog/flexgens-hybridos-energy-management-system-receives-iso-90012015-certification)

## Optional

- [Secondary-market listing (Forge Global)](https://forgeglobal.com/flexgen-power-systems_stock/) — third-party venue, not a FlexGen property.