BEMServer
BEMServer: A flexible, free foundation for developers building energy-management infrastructure. Ranked #20 of 25 in Energy Management Software by our editors (6.9/10); pricing: Free plan; best for developers building free energy infrastructure.
At a glance
- Editor score6.9 / 10
- PricingFree plan
- Best forDevelopers building free energy infrastructure
- Free planYes
- Paid fromFree
- Energy monitoringBasic
- Founded2015
- Facts checked22 Sep 2026
Where it wins
- Free and open-source with self-hosted deployment
- Documented REST API and modular third-party architecture
- Supports BMS, KNX, BACnet, LonWorks, IoT, IFC, and Grafana
Where it doesn't
- Energy monitoring is characterized as basic
- Installation, configuration, and maintenance require technical ownership
- Partner modules may involve separate costs
Our verdict on BEMServer
BEMServer is an open-source building energy management platform for building owners, facility managers, energy managers, consultants, ESCOs, and building-service developers. It aggregates BMS data, weather, and contextual information, then stores and exposes that information through documented REST APIs. The platform also includes time-series and event storage, visualization, fault detection and diagnosis, forecasting modules, data preprocessing, and role-based access control. It is particularly suited to developers who want a free, self-hosted foundation that can be extended with additional services.
Its strongest fit is the surrounding building-data ecosystem. BEMServer connects with Building Management Systems and supports KNX, BACnet, LonWorks, IoT protocols, IFC, Excel, and Grafana. The REST API and modular architecture allow partner or third-party services to contribute visualization, energy management, forecasting, simulation, and other capabilities. That makes it more adaptable than a narrowly focused monitoring application, especially for teams assembling a broader building-energy stack. Developers should still assess the specific compatibility and implementation requirements of each connected system before selecting it for a project.
The published offering is free and open source, but installation, configuration, maintenance, and training may require internal expertise or external support. Partner modules may also involve separate costs. BEMServer includes forecasting, preprocessing, cleansing, resampling, unit conversion, fault diagnosis, and access control, while its energy monitoring is characterized as basic. Choose it if control, extensibility, and self-hosting matter more than a turnkey interface. Organizations seeking a packaged monitoring experience with minimal technical ownership may be better served by a more managed alternative.
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BEMServer pricing
BEMServer fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Energy monitoring | Basic |
| Energy forecasting | Yes |
| Carbon tracking | Not verified |
| Utility data import | Not verified |
| Data retention | Not verified |
| API access | Yes |
| Deployment | Self-hosted, Cloud |
| Platforms | Web |
| Support | Tickets, Community, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 9 integrations: Building Management Systems, REST API, KNX, BACnet, LonWorks, IoT protocols … See all → |
| Pricing | Free plan |
| Website | bemserver.org |
| Facts checked | 22 Sep 2026 |
BEMServer integrations
BEMServer lists 9 integrations on its own site.
- Building Management Systems
- REST API
- KNX
- BACnet
- LonWorks
- IoT protocols
- IFC
- Excel
- Grafana
See all BEMServer integrations →
Alternatives to BEMServer
- ABB NsightA portfolio-focused platform for monitoring, reporting, forecasting, and energy optimization.9.2
- Johnson Controls OpenBlue Net ZeroA broad portfolio platform for utility data, emissions tracking, forecasting, and reporting.9.1
- Siemens Industrial Energy ManagementA broad industrial portfolio for monitoring, benchmarking, and optimizing energy across complex sites.9.0
See all BEMServer alternatives →
Also Ranked In
BEMServer is ranked in 2 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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