---
title: "Energy Management & Monitoring with MQTT | ConnectMQ"
description: "Collect meter, sub-meter and BMS data over MQTT from every site: kWh per line or building, peak-demand alerts and measured data for your energy reviews."
url: "https://connectmq.com/use-cases/energy-management/"
language: "en"
---

Use case

# Energy management on live meter data

Main meters, sub-meters, power analysers and BMS controllers publish to ConnectMQ. Your energy management system, dashboards and production tools subscribe, so you see kWh, peak demand, gas and compressed air per site, line and asset — while you can still do something about it.

[Try it free](https://app.connectmq.com/signup) [See pricing](https://connectmq.com/pricing/)

No card required

Used in

-   [Manufacturing](https://connectmq.com/industries/manufacturing/)
-   [Food & Beverage](https://connectmq.com/industries/food-beverage/)
-   [Telecom](https://connectmq.com/industries/telecom/)

Example message

PUBLISH energy/dallas/line-1/main-meter/power

```
{"ts":"2026-10-22T10:15:00Z","kw":412.6,"kwh_total":1849213.4,"pf":0.94,"v_l1":231.2}
```

QoS 1 · TLS 8883 · PUBACK

The problem

## One utility bill, no idea where it went

Energy cost arrives as one monthly invoice per site. Sub-meters exist, but they are read by different gateways, stored in a BMS or a vendor portal and never put next to production data. Peak-demand charges are discovered after the fact, and energy per part or per square metre remains a guess.

## How it works

1.  1
    
    ### Meter the loads
    
    Power analysers, sub-meters and pulse counters on lines, compressors, HVAC and chillers are read over Modbus, M-Bus or BACnet by a site gateway or the BMS.
    
2.  2
    
    ### Publish per site and asset
    
    The gateway publishes kW, kWh, power factor, gas and compressed-air flow to topics per site, building, line or asset over TLS.
    
3.  3
    
    ### Analyse and correlate
    
    Your EMS, historian or dashboard subscribes and puts consumption next to production counts or occupancy to calculate energy per part, shift or square metre.
    
4.  4
    
    ### Act on peaks
    
    Threshold rules alert when demand approaches the contracted peak, and your control logic can publish a command to shed or shift non-critical loads.
    

ConnectMQ

## What it needs from the broker

### Every site, one broker

Factories, stores, offices and warehouses publish to one private broker with a consistent topic tree and separate credentials per site.

### Many consumers, one reading

The same reading feeds the EMS, sustainability reporting, the plant dashboard and the 3D Digital Twin without reading the meter twice.

### Alerts on demand

Threshold rules on kW or consumption notify facility and plant managers before a peak turns into an invoice line.

### Reliable control commands

Load-shedding and setpoint commands use QoS 1 on dedicated command topics, and retained state shows what each load is currently set to.

## What you get

-   Consumption visible per site, line and asset, not per invoice
-   Peak-demand events caught while they are happening
-   Energy per unit of output tracked next to production
-   Measured data ready for energy reviews and sustainability reporting

Example topics

```
energy/dallas/line-1/main-meter/power
energy/dallas/utilities/compressor-02/power
energy/dallas/site/demand              (retained)
energy/dallas/hvac/ahu-03/set
```

## Industries that run this use case

 [![](https://connectmq.com/images/industries/hero/manufacturing.webp) Manufacturing](https://connectmq.com/industries/manufacturing/) [![](https://connectmq.com/images/industries/hero/food-beverage.webp) Food & Beverage](https://connectmq.com/industries/food-beverage/) [![](https://connectmq.com/images/industries/hero/telecom.webp) Telecom](https://connectmq.com/industries/telecom/)

## Related solutions

[

### Smart Energy

Meters, EV chargers, solar and batteries

Learn more](https://connectmq.com/energy-utilities/)[

### Industrial IoT & Smart Manufacturing

Machines, PLC gateways, OEE and quality data

Learn more](https://connectmq.com/industrial-iot/)

## Frequently asked questions

How do I send energy meter data to MQTT?

Many modern meters and power analysers publish MQTT natively. For Modbus, M-Bus or BACnet devices, a gateway — an industrial IoT gateway, a PLC or Node-RED on an edge PC — reads the registers and publishes the values to a topic per meter over TLS.

Can MQTT data be used for ISO 50001 energy management?

MQTT can carry the measured data your energy management system uses for energy reviews, baselines and energy performance indicators. ConnectMQ delivers that data; the analysis, reporting and any certification stay with your EMS and your organisation.

MQTT or BACnet for building energy monitoring?

They solve different problems. BACnet runs the building automation inside a site; MQTT moves data out of many sites to central applications. Most portfolios keep BACnet in the building and publish selected points to an MQTT broker for central energy monitoring.

## Build it on ConnectMQ

Start on the Free plan — no card required — connect your first devices today and upgrade when you go live.

[Get started](https://app.connectmq.com/signup) [See pricing](https://connectmq.com/pricing/)

## More use cases

-   [Predictive Maintenance](https://connectmq.com/use-cases/predictive-maintenance/)
-   [Asset Performance Tracking](https://connectmq.com/use-cases/asset-performance-tracking/)
-   [Industrial Agentic AI Operations](https://connectmq.com/use-cases/industrial-agentic-ai/)
-   [Connected Vehicles](https://connectmq.com/use-cases/connected-vehicles/)
-   [EV Charging Management](https://connectmq.com/use-cases/ev-charging-management/)
-   [Fleet Management](https://connectmq.com/use-cases/fleet-management/)
-   [Remote Asset Monitoring](https://connectmq.com/use-cases/remote-asset-monitoring/)
-   [Tank Level Monitoring](https://connectmq.com/use-cases/tank-level-monitoring/)
-   [Smart Metering](https://connectmq.com/use-cases/smart-metering/)
-   [Solar & Wind Farm Monitoring](https://connectmq.com/use-cases/solar-wind-farm-monitoring/)
-   [Cleanroom & GMP Environmental Monitoring](https://connectmq.com/use-cases/cleanroom-environmental-monitoring/)
-   [Cold Chain Monitoring](https://connectmq.com/use-cases/cold-chain-monitoring/)
-   [Remote Patient Monitoring](https://connectmq.com/use-cases/remote-patient-monitoring/)
-   [Hospital Equipment Monitoring & Tracking](https://connectmq.com/use-cases/medical-equipment-tracking/)
-   [Real-Time Notifications](https://connectmq.com/use-cases/real-time-notifications/)
-   [Smart Store Operations](https://connectmq.com/use-cases/smart-store-operations/)
-   [ATM & POS Terminal Monitoring](https://connectmq.com/use-cases/atm-pos-terminal-monitoring/)
-   [Telecom Network Equipment Monitoring](https://connectmq.com/use-cases/network-equipment-monitoring/)
-   [IoT Platform for Operators](https://connectmq.com/use-cases/iot-platform-for-operators/)
-   [Real-Time Market Data](https://connectmq.com/use-cases/real-time-market-data/)
-   [Agricultural Drones](https://connectmq.com/use-cases/agricultural-drones/)
-   [Greenhouse IoT Sensors](https://connectmq.com/use-cases/greenhouse-iot-sensors/)
-   [Data Center Monitoring](https://connectmq.com/data-centers/)
-   [Smart Irrigation](https://connectmq.com/smart-agriculture/)

## Articles

[All articles](https://connectmq.com/blog/)

Managed MQTT Cloud

### [How to Choose an IoT MQTT Broker: 12 Criteria and the Questions to Ask Your Vendor](https://connectmq.com/blog/how-to-choose-an-iot-mqtt-broker/)

A practical 12-point checklist for choosing an IoT MQTT broker, a table of questions to ask every vendor, and a five-minute hands-on test you can run against broker.connectmq.com.

September 21, 20269 min read

MQTT Fundamentals

### [MQTT QoS Levels Explained: QoS 0, 1 and 2 with Packet Flows and Examples](https://connectmq.com/blog/mqtt-qos-levels-explained/)

A practical guide to MQTT QoS: how QoS 0, 1 and 2 work on the wire, why the delivered QoS can be lower than you asked for, how sessions queue messages and which level to choose for each use case.

August 20, 20269 min read

MQTT Security

### [MQTT Security Best Practices: A 12-Point Checklist for IoT Teams](https://connectmq.com/blog/mqtt-security-best-practices/)

A hands-on MQTT security checklist covering TLS, credentials, client IDs, topic design, payload validation, rate limits and certificate checks, plus how ConnectMQ handles each point.

September 28, 202611 min read