BEMServer vs Optergy Enterprise

BEMServer is an open-source platform for deploying a modular building energy management system. It gathers information from building management systems and sensors alongside weather, occupant feedback, building descriptions, and contextual data. The platform connects building hardware with data-oriented services, storing building models, time series, and events for access through documented REST APIs. Its data model follows IFC and Haystack standards. Processing modules interpret collected information to identify issues or inefficient operation and support recommendations and decisions. Listed modules cover fault detection and diagnosis, renewable energy simulation, energy management, load forecasting, indoor environmental quality, and visualization. The software is licensed under AGPL-3.0, and sellers using a modified version must publish their modifications under that license. There is no software license fee, although installation, configuration, maintenance, and selected modules may be paid services. The maker recommends help from someone with Python and Docker knowledge and says installation was tested on Debian 9. BEMServer currently supports building monitoring; other uses require extending its functionality.

Optergy Enterprise is paid, on-premises building management software hosted locally for real-time control, measurement, and reporting. It combines building automation, energy management, and tenant billing, with web access and listed Android, iOS, Windows, API, and self-hosted support. Utility and sub-meter readings are monitored continuously, and anomaly alerts can identify location, time, and cost implications. Users create trends, alarms, schedules, and calendars, with escalation for unacknowledged alarms. Reports are customizable and available as web, PDF, or CSV outputs that can be emailed automatically. BACnet and Modbus TCP-IP connectivity supports building systems, while a third-party API connects custom applications and devices. Tenant billing covers utility and after-hours energy use but does not collect payments. The base licence includes 150 devices, up to three tenants, 50 Optimum Start areas, and 50 Demand Limiting points, all expandable. Users and groups are unrestricted, with live and scrolling displays. The product page states there are no ongoing fees, but purchase pricing is available only on request.