Energy Metering for Commercial & Industrial Applications

C&I sub-metering provides circuit-, area- or equipment-level energy data that a main utility meter normally cannot show. It can help separate consumption from production lines, HVAC systems, tenant areas, distribution panels, EV charging circuits, PV/ESS connections and other major loads. The data can support internal cost allocation, load analysis, energy-management decisions and EMS/BMS monitoring, depending on the project design.

Start with the electrical single-line diagram and define what each measurement point needs to explain. Typical locations include main incomers, distribution panels, tenant or floor circuits, production lines, HVAC equipment, major machines, EV charging feeders and PV/ESS connections. For each point, confirm the electrical system, current range, connection method, measurement purpose and where the data needs to be sent before selecting the meter.

Monitoring, internal cost allocation and regulated billing have different metering and compliance requirements. A monitoring project may focus on electrical parameters, communication and system integration, while internal allocation may require stable circuit-level energy data and clear measurement boundaries. Regulated billing may require specific meter approvals, documentation and local legal-metrology compliance. The intended use should therefore be defined before selecting the meter.

C&I sub-meters can provide measurement data to an EMS, BMS, SCADA system, gateway or other monitoring platform when the required communication path is defined. Integration should confirm the meter interface, communication protocol, register map, required data points, network topology, device addressing and polling requirements. RS485 with Modbus RTU is commonly used in C&I projects, but compatibility must be verified for the selected meter and host system.