BEMServer vs Wia

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.

Wia is an energy intelligence platform for operators managing building portfolios. It combines meter, building-management-system, invoice and cloud data to monitor electricity, gas and water across sites. Data can arrive through retrofit IoT, cellular or LoRaWAN, BMS integration, manual uploads, invoice ingestion, cloud connections or an open API. Optimization tools rank savings opportunities, support solar-yield and charging optimization, and detect anomalies from actual consumption. Operations features include alerts, audits, surveys, tasks, device-health monitoring and remote firmware updates. Wia can schedule heating, cooling and lighting through BACnet or Modbus controllers and control VRF systems over their own protocol. Reports export as PDF, Excel or CSV for standards including CSRD, EPBD, EED, MEES, SECR and ISO 50001. ESG integrations include Watershed, Sweep, Persefoni, Plan A, Sphera, Greenstone and EcoVadis; REST, webhooks and OAuth are supported. Pricing is quoted per site after a remote survey. Wia supplies CSRD data but does not file regulatory returns.