Submetering & remote meter reading

Submetering and remote meter reading involve precisely measuring energy usage (heating, cooling, electricity, gas, hot water, etc.) beyond the main meter, then automatically transmitting this data (radio/IP/4G) to a monitoring tool. The idea is to know who consumes what, when, and where, in order to act quickly (adjustments, alerts, condition-based maintenance), to fairly distribute costs (leases, unit entitlements, lots), and to document performance (Energy Performance Contracts, labels, carbon footprints). Without measurement, there is no credible decision-making; without remote meter reading, there is no responsive management.

Submetering & remote meter reading: operational definition

A typical system combines energy meters (heating/cooling), electricity meters, domestic hot water flow meters, gas meters, and sensors (temperature, CO₂, humidity). The equipment is addressed (Modbus/BACnet/M-Bus, pulses) and connected to a gateway that sends the data to a building management system (BMS). Aggregation (15/30 min), indicators (kWh, kWh/m², discomfort density, observed COP/SCOP), alarm thresholds (domestic hot water leak, abnormal temperature difference, power overrun), and reports (monthly, quarterly) are configured for building managers, developers, or asset managers. All of this is accompanied by a clear map (which unit supplies which energy) and a metrology plan (application, location, calibration frequency).

Challenges, limitations and points of attention regarding undercounting

Interests

• Fair allocation of charges (per batch/user) and transparent billing.
• Reactive control: detection of DHW leaks, ΔT drifts, abnormal schedules.
• Optimization: GTB settings, erasure, peak clipping, SCOP/SEER improvement observed.
• Informed decision: prioritize quick wins vs CAPEX with reliable data.
• Compliance/contracts: CPE monitoring, carbon footprints, IAQ indicators.

Boundaries

• CAPEX/OPEX for metrology (sensors, gateways, data subscriptions).
• Quality of installation and calibration: poor installation distorts decisions.
• Interoperability: heterogeneous protocols and formats without standardization.
• Information overload without clear dashboards and reading routines.

Points to consider

• Metering plan from the design stage: critical points (DHW, HVAC, tenants).
• Hierarchy of measures: what serves steering before curiosity.
• Data governance: access rights, GDPR, traceability of corrections.
• Metrology maintenance: calibrations, batteries, pulse/bus verification.
• Network quality: radio/IP coverage, security, consistent timestamping.
• Visualization: Actionable KPIs (kWh/m², off-peak hours, peak/base ratio).

Anecdote — “The invisible tap of Clermont-Ferrand”

In Clermont-Ferrand, a mixed-use building saw its hot water bill climb without any complaints from residents. Submetering revealed a constant nighttime flow in one riser: a micro-leak in the basement, inaudible, was heating water for… no one. With remote meter reading, the "abnormal flow > 2 h" alarm was activated; the leak was repaired within 48 hours. The result: a 17% reduction in annual hot water costs and a building manager who now jokes: "We've turned off the phantom tap." The moral of the story: what you measure can be controlled — and what you monitor can be fixed.