Smart Metering and Submetering Technology Services
Smart metering and submetering technology services encompass the hardware, software, installation, commissioning, and ongoing management required to measure, record, and transmit granular energy and utility consumption data within commercial, institutional, and multifamily buildings. This page covers the technical definitions, operating mechanisms, deployment scenarios, and selection criteria that guide building owners, facility managers, and engineers toward appropriate metering architectures. Accurate submeter data underpins building energy management technology services, tenant cost allocation, and regulatory compliance reporting across a rapidly evolving utility infrastructure landscape.
Definition and scope
A smart meter is an advanced metering infrastructure (AMI) device that records consumption at defined intervals — typically 15-minute or hourly intervals — and transmits that data automatically to a utility or building management system. The U.S. Department of Energy defines advanced metering infrastructure as a system that measures, collects, and analyzes energy usage through two-way communication between the meter and the utility or building operator (U.S. DOE, Office of Electricity, AMI Overview).
A submeter operates downstream of the utility master meter, measuring consumption for a discrete zone, tenant space, circuit, or piece of equipment rather than for the entire building at the service entrance. Submeters may measure electricity, natural gas, water, steam, chilled water, or compressed air — each requiring sensor technologies and calibration standards appropriate to the medium.
Scope boundaries matter for procurement and compliance purposes:
- Utility-grade revenue meters — installed and owned by the utility company, governed by ANSI C12 standards for accuracy and tamper resistance (ANSI C12.1, Electric Meters Code for Electricity Metering).
- Check meters / interval meters — building-owner-installed devices at the service entrance that mirror utility data for independent verification.
- Tenant submeters — devices allocated to individual leasable spaces, enabling direct billing or cost allocation without utility involvement.
- Circuit-level or equipment-level submeters — the most granular tier, often associated with IoT integration services for smart buildings and used for load profiling specific HVAC units, lighting panels, or process equipment.
ASHRAE Guideline 22 (Instrumentation for Monitoring Central Chilled-Water Plant Efficiency) and ASHRAE Standard 90.1 both reference metering as a component of building energy compliance, with Standard 90.1-2022 requiring individual metering for spaces exceeding 25,000 square feet in certain building categories (ASHRAE Standard 90.1).
How it works
Smart metering and submetering systems operate through four functional layers:
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Sensing and transduction — Current transformers (CTs), voltage transformers (VTs), pulse-output sensors, or ultrasonic flow sensors convert physical energy flows into measurable electrical signals. CT accuracy class — typically 0.2% to 0.5% error — determines billing-grade suitability.
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Local processing and registration — Meter electronics integrate the signal over time, applying tariff schedules or interval timestamps, and store readings in non-volatile memory. Modern meters support IEC 62056 DLMS/COSEM data models for interoperability.
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Communication and transmission — Data moves from the meter to a data concentrator or head-end system via wired (Modbus RTU/TCP, BACnet MS/TP, M-Bus) or wireless protocols (Zigbee, LoRaWAN, cellular LTE-M). The choice of protocol affects latency, range, and cybersecurity posture, intersecting directly with smart building cybersecurity services.
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Data management and analytics — Head-end software or cloud platforms aggregate interval data, normalize for weather and occupancy, flag anomalies, and generate reports. Integration with a building automation system or smart building data analytics services platform enables automated demand response and fault detection.
Billing-grade submeters must meet ANSI C12.20 Class 0.2 accuracy (±0.2% at full load) for tenant billing applications. General-purpose monitoring submeters frequently operate at Class 0.5 or Class 1.0, which is adequate for energy management but not for direct cost recovery under most state public utility commission rules.
Common scenarios
Multitenant commercial office buildings use tenant submetering to allocate actual consumption rather than prorated estimates based on square footage. A 500,000-square-foot Class A office tower may install 80 to 200 electrical submeters across floors and common areas to support net-zero lease structures and green lease provisions.
Campus and portfolio energy management aggregates submeter data from distributed buildings into a central platform, enabling facility teams to benchmark energy use intensity (EUI) in kBtu per square foot per year — a metric tracked by ENERGY STAR Portfolio Manager (U.S. EPA ENERGY STAR Portfolio Manager).
Demand response and grid services use interval meter data to identify 15-minute peak demand periods, enabling automated load shedding that reduces demand charges — which can represent 30% to 50% of a commercial electricity bill (structural fact; specific percentage ranges vary by utility tariff structure).
Utility benchmarking and compliance in jurisdictions with building performance standards (such as those established under the U.S. DOE Building Technologies Office's Better Buildings Initiative) requires verified submeter data to demonstrate year-over-year energy intensity reductions.
Decision boundaries
Selecting between smart meter types and submetering architectures involves four primary decision factors:
| Factor | Utility AMI Meter | Tenant Electrical Submeter | Circuit-Level Submeter |
|---|---|---|---|
| Accuracy requirement | ANSI C12.20 Class 0.2 | Class 0.2 (billing) / Class 1.0 (monitoring) | Class 1.0–2.0 |
| Communication protocol | Utility AMI network | BACnet, Modbus, M-Bus | Modbus, LonWorks, proprietary |
| Ownership | Utility company | Building owner | Building owner |
| Regulatory jurisdiction | State PUC | State PUC + lease law | Internal only |
Buildings in states with active submetering regulations — including New York, California, and Massachusetts, each of which has published specific Public Utility Commission guidance on tenant submetering — must verify that chosen meter hardware and billing practices conform to applicable tariff schedules before deployment. Smart building compliance reporting services providers typically assist with this verification step.
The decision between a wired Modbus backbone and a wireless mesh network depends on building construction type: concrete core structures with reinforced slabs attenuate 2.4 GHz signals significantly, often favoring wired M-Bus or powerline carrier communication. Conversely, open-plan retrofit projects where conduit runs are cost-prohibitive benefit from LoRaWAN or cellular submetering modules, which integrate with wireless sensor network services already present in the building.
Predictive maintenance technology services represent a downstream application enabled by submeter granularity: equipment-level current signatures can detect motor degradation weeks before failure, reducing unplanned downtime and repair costs.
References
- U.S. Department of Energy, Office of Electricity — Advanced Metering Infrastructure Overview
- ASHRAE Standard 90.1 — Energy Standard for Sites and Buildings Except Low-Rise Residential Buildings
- ANSI C12.1 — American National Standard for Electric Meters: Code for Electricity Metering
- U.S. EPA ENERGY STAR Portfolio Manager — Benchmarking Tool
- U.S. DOE Better Buildings Initiative — Building Technologies Office
- IEC 62056 DLMS/COSEM — International Electrotechnical Commission Data Exchange Standard
- ASHRAE Guideline 22 — Instrumentation for Monitoring Central Chilled-Water Plant Efficiency