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Building Energy Monitoring System

Chiller plant to tenant riser. Into the BMS you already have.

A commercial and business energy monitoring system for offices, malls, hotels, hospitals and campuses. Class 0.5S meters on the circuits that matter — chillers, AHUs, lifts, lighting risers, tenant supplies, car-park charging — feeding your existing BMS natively over BACnet, and a portfolio dashboard if you want one. Monitoring a factory or process plant instead? Use industrial energy monitoring, which is built around motor loads and production lines.

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Building energy monitoring dashboard showing live consumption across chiller plant, tenant supplies and common-area circuits

At a glance

What it is
Circuit-level Class 0.5S electricity metering across a commercial building, feeding a BMS, a dashboard, or both.
Built for
Offices, malls, hotels, hospitals, mixed-use and campuses — single building or a managed portfolio.
BMS integration
Native BACnet/IP and BACnet MS/TP, plus Modbus RTU/TCP and MQTT. No gateway, no translation module.
Cost per point
₹8,500–₹18,300 per meter. No catalogue MOQ — a pilot can be one meter. 4 weeks from confirmed PO.
Per-site infrastructure
None. No energy-server PC, data concentrator or per-site software licence.
Reporting
On-device CO₂ from a configurable grid factor — Scope 2 data for BRSR, CSRD and GHG Protocol.

A Building Bill Is One Number for Fifty Decisions

A commercial building arrives with one utility reading a month. From that single number a property team is expected to apportion CAM charges, answer a tenant who thinks they are overpaying, judge whether the chiller retrofit worked, and fill in an ESG disclosure. None of those questions can be answered from a total.

The gap is widest where the load is largest. HVAC is typically 40–60% of a commercial building's electricity, and chiller efficiency degrades quietly — fouled tubes, refrigerant loss, a failing compressor, pumps running at a fixed speed against a changed load. A chiller consuming 10% more than its commissioned kW/TR does not announce itself. It simply appears in the bill as weather, or occupancy, or nothing in particular.

Metering the circuits individually makes each of those questions answerable with data rather than argument — and because the meters speak BACnet natively, it does so without displacing the building management system you already run.

What to Meter in a Commercial Building

Six circuit groups, in the order they usually repay the meter.

Chiller plant and HVAC

Typically 40–60% of a commercial building's electricity. Metering the chillers, AHUs and pump sets separately is where the first real saving is found, because it is the only way to see kW/TR drifting away from the commissioned figure.

Tenant and common-area supplies

Separating landlord load from tenant load turns CAM charges from an apportioned estimate into measured kWh. It also ends the annual argument, because a disputed bill can be answered with interval data.

Lifts, lighting and small power

The circuits nobody meters individually, which is exactly why nobody can explain the base load. One meter per riser makes overnight and weekend consumption legible.

Standby and critical power

DG sets and UPS feeders metered continuously, so generator cost per kWh and backed-up load are known numbers rather than assumptions discovered during an outage.

Car park and EV charging

EV charging is becoming a material building load and often sits on the landlord's supply. Separate metering is what makes recovery from drivers or tenants defensible.

Kitchens, laundry and amenities

In hotels and malls these are concentrated, schedule-driven loads that respond well to measurement — and they are frequently left running outside operating hours.

It Feeds the BMS You Already Have

In commercial buildings the building management system is usually already installed, already commissioned, and not going anywhere. Honeywell, Siemens Desigo, Johnson Metasys and Schneider EcoStruxure Building all speak BACnet as their native protocol, and most energy meters do not — which is why metering retrofits so often arrive with a BACnet gateway per riser, each one a licence cost, a configuration file and a thing that can fail.

Every Titan meter speaks BACnet/IP over Ethernet or WiFi and BACnet MS/TP over RS485 natively, with no gateway or translation module. Alongside that it runs Modbus RTU, Modbus TCP and MQTT. The RS485 port carries Modbus RTU or BACnet MS/TP, selected at commissioning, because RS485 is a single physical bus and carries one protocol at a time.

So the BMS keeps doing control and gains a metering-grade measurement layer underneath it. If you would rather the data went somewhere else — a tenant-billing system, a portfolio analytics platform, your own cloud — MQTT publishes to any broker you configure, and no data path requires a Tech OVN server. The EMS vs BMS vs SCADA comparison sets out where each system's job starts and stops.

Class 0.5S matters here for a commercial reason, not a technical one: it is the accuracy class utilities use for revenue billing, so a tenant invoice generated from it survives being challenged.

Start With the Chiller Plant

If HVAC is half the building's electricity, the chiller plant is where measurement pays back first. Electrical metering on the chiller supply gives you consumption and demand. Adding thermal measurement on the chilled-water loop gives you the ratio that actually describes efficiency — kW/TR, and from it COP.

That ratio is the one number a plant room cannot fake. It moves when tubes foul, when refrigerant is low, when a compressor stage is failing, and when pumps and towers are sequenced badly. Measured continuously against the commissioned figure, it turns chiller maintenance from a calendar exercise into a condition-led one.

For electrical-only monitoring the Titan meter is enough. For measured kW/TR and COP on a single device, use Titan Plus BTU, which combines Class 0.5S electrical metering with EN 1434 Class 2 thermal metering. If cooling is being billed to tenants rather than just monitored, that belongs on HVAC and chilled-water billing. You can model the numbers first with the chiller COP calculator.

Specification

What a consultant or specifier needs to write this into a tender.

ParameterSpecification
Accuracy classClass 0.5S active energy per IEC 62053-22 — the class utilities use for revenue billing, so tenant bills hold up when disputed
Voltage / current48 V to 500 V AC, 3-phase 4-wire or 3-wire; CT primary 10 A – 1000 A
Parameters measuredV, I, P, PF, f, kWh, kVARh, kVAh (import and export), maximum demand (kW, kVA, A)
Tariff registersTime-of-use / ToD registers configurable on-device; kVAh registers for apparent-energy tariffs
Power qualityIndividual voltage and current harmonics to the 31st order per phase, plus THD-V and THD-I — enough to catch distortion from VFDs, LED drivers, UPS and lift drives
BMS protocolsBACnet/IP over Ethernet or WiFi, BACnet MS/TP over RS485 — native, no gateway
Other protocolsModbus RTU (RS485), Modbus TCP (port 502), MQTT to any broker (TLS), HTTP/HTTPS and TCP/IP push
Protocol selectionRS485 carries Modbus RTU or BACnet MS/TP, selected at commissioning — one at a time, because RS485 is a single physical bus
Per-site infrastructureNone. WiFi and Ethernet built in — no energy-server PC, no data concentrator, no per-site licence
SustainabilityOn-device CO₂ using a configurable grid emission factor — Scope 2 data for BRSR, CSRD and GHG Protocol
MountingDIN rail, 94 × 89 × 69 mm — fits an existing riser sub-board or landlord panel without rework
Environment−25 °C to +70 °C, UL94 V-0 self-extinguishing enclosure, IP51 front face, EMC per IEC 61000-4 series
CommissioningTitan smartphone app over WiFi — no laptop, serial cable or proprietary software
Commercial terms₹8,500–₹18,300 per meter. No catalogue MOQ, single units from stock. 4 weeks from confirmed PO. Made in India

Frequently Asked Questions

Eight questions property and facility teams ask before specifying a building energy monitoring system.

A building energy monitoring system measures electricity consumption circuit by circuit across a building — chiller plant, AHUs, lifts, lighting risers, tenant supplies, car park — rather than taking a single reading at the utility meter. Each circuit gets a smart meter; the readings feed a dashboard that shows where consumption goes, when it is wasted, and what it costs. It is the measurement layer a BMS was never designed to provide: a BMS controls equipment, while an energy monitoring system measures it to metering-grade accuracy and keeps the history.
Because they do different jobs. A BMS is built to control HVAC, lighting and access — its outputs are setpoints and schedules. It usually polls meters every 15 minutes, stores the result in its historian, and rarely has metering-grade accuracy or power-quality data. An energy monitoring system measures every cycle at Class 0.5S, keeps the interval history, and is built around energy reporting, tenant chargeback and ESG disclosure. Most buildings run both: the BMS keeps control, the meters add the measurement layer beneath it. Titan feeds your existing BMS natively over BACnet or Modbus, so this is an addition rather than a replacement.
Yes. Every Titan meter speaks BACnet/IP over Ethernet or WiFi and BACnet MS/TP over RS485, alongside Modbus RTU, Modbus TCP and MQTT — with no gateway, protocol converter or translation module in the data path. The RS485 port carries Modbus RTU or BACnet MS/TP, selected at commissioning, since RS485 is a single physical bus. That matters in a building because BACnet is the default protocol for Honeywell, Siemens Desigo, Johnson Metasys and Schneider EcoStruxure Building, and a gateway per riser is both a licence cost and a failure point.
A Class 0.5S meter per tenant supply gives you defensible interval data — Class 0.5S is the accuracy class utilities use for revenue billing, so the figure holds up when challenged. Time-of-use registers are configurable on-device if your tariff is time-of-day, and kVAh registers are available where the tariff bills on apparent energy. For cooling billed separately, thermal metering is a different measurement and is covered on the HVAC billing page.
₹8,500 to ₹18,300 per meter depending on variant, which is the cost per measurement point rather than per site. There is no minimum order quantity on catalogue meters — single units ship from stock, so a pilot on the chiller plant alone is a valid order — and lead time is 4 weeks from confirmed PO. There is no per-site energy server, gateway or software licence to buy, because WiFi and Ethernet are built into the meter.
Yes, and for a landlord or operator this is usually the main reason to do it. Each meter reaches the platform over WiFi or Ethernet on its own, so there is nothing per-site to roll out. Buildings appear in one portfolio view, which is what makes cross-building benchmarking possible — the same chiller model consuming 15% more at one property is a finding you cannot reach from single-building dashboards.
Not to assess it. Titan Audit uses split-core CTs that clamp around a live conductor, so a baseline survey can be taken across an occupied, running building with no shutdown. Permanently wired meters need a planned isolation on the circuit being metered, which normally folds into an existing maintenance window — the meter is DIN rail and 94 × 89 × 69 mm, so it fits an existing sub-board without panel rework.
Yes, for the Scope 2 electricity side. CO₂ is calculated on-device using a configurable grid emission factor, so the emissions figure is derived from measured kWh per circuit rather than back-calculated from invoices in a spreadsheet. That gives you consumption attributable to a building, a tenant or a system, which is the granularity disclosure frameworks increasingly expect.

Related Solutions & Products

The industrial counterpart, the people who run this, and the meters behind it.

Industrial Energy Monitoring

The factory and process-plant counterpart to this page — motor loads, production lines, compressed air and DG sets.

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Facility Management

One measurement layer serving the energy budget and the maintenance budget together, across a building or a portfolio.

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Energy Management System (EMS)

The platform above the meters — portfolio dashboards, ISO 50001 EnPI tracking and automated reporting.

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Titan Smart Energy Meter

Class 0.5S 3-phase DIN rail meter with WiFi, Ethernet and RS485, and native BACnet. The meter behind the monitoring.

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HVAC / Chilled-Water Billing

Billing tenants for cooling on measured thermal energy rather than apportioned floor area.

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Electricity Sub-Metering

Tenant and departmental sub-metering, CAM reconciliation and defensible chargeback.

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See where your building's energy actually goes

Talk to our team about metering a building or a portfolio — including which circuits to meter first and how it lands in your BMS.

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