Multi-utility energy monitoring is the practice of measuring, recording and analysing all the energy resources a facility consumes — electricity, natural gas, water, compressed air and steam — in real time, on a single platform. Most industrial sites start their energy monitoring journey with electricity; yet a significant share of the total energy bill comes from the other utilities. In this article we look at why monitoring electricity alone is not enough, how each utility is actually measured in the field, and what a facility manager or energy manager concretely gains when every consumption stream flows into one platform.
Why Monitoring Electricity Alone Is Not Enough
Electricity is the most visible energy item in an industrial plant: the invoice arrives regularly, measurement is comparatively easy, and there are direct penalties such as reactive power charges. That is why most monitoring projects begin at the electrical panels. But the picture changes when you look at total energy cost. In facilities with boilers, furnaces or process heating, the natural gas bill typically rivals — and sometimes exceeds — the electricity bill. Water is a quietly growing cost line, both on the supply side and through wastewater charges. Compressed air does not even appear as a separate line on any invoice, because it is produced from electricity; yet compressors typically account for a substantial share of a plant’s electrical consumption, and part of the air they produce is lost through leaks before it is ever used.
A plant that monitors only electricity is forced to track the rest of its energy cost through month-end invoices — retrospective, aggregated numbers. Which boiler is running inefficiently, which line has a water leak, where the compressor’s output actually goes: none of this is visible. The principle that unmeasured consumption cannot be managed applies to every utility, not just electricity. We covered the fundamentals in our guide on what energy monitoring is and how it works; this article is about extending that same discipline to every resource on site.
What Is Multi-Utility Energy Monitoring?
Multi-utility energy monitoring means tracking all meterable resources — electricity plus natural gas, water, compressed air and steam — through the same data acquisition infrastructure and the same software platform. Each utility is measured in the field by its own type of instrument; the readings travel to a central platform over Modbus, M-Bus, pulse outputs or wireless IoT communication, and are stored with synchronised timestamps. The result is that the energy manager sees the plant’s entire energy flow on one screen, on one time axis, in comparable units. The role of IoT-based energy monitoring is particularly important here, because it makes it practical to collect data even from points where cabling would be difficult.
The critical point is that the utilities are not merely displayed side by side — they can be analysed together. Correlating electricity with production output, gas with heat generated, and compressor power with air flow delivered is what separates true multi-utility monitoring from a collection of separately installed tracking systems.
How Each Utility Is Measured
Each resource has a different physical nature, so each requires a different measurement approach. Below are the typical methods for the most common utilities.
Electricity: Power Analysers
Electrical consumption is measured with power analysers installed at the main distribution board, sub-panels and the feeds of critical machines. Analysers measure current, voltage, active and reactive power, power factor and harmonics, and report over Modbus to the platform. Current transformer selection and instrument accuracy class directly determine data quality, so this is the step that deserves the most care during installation.
Natural Gas: Flow Meters and Meter Pulse Outputs
Gas consumption can be monitored in two ways. The first is connecting the pulse output of the existing gas meter to the system: the meter emits one pulse per fixed volume, and the platform accumulates these pulses into consumption. The second is adding a dedicated flow meter — turbine, rotary or thermal mass type — on the line feeding large consumers such as boilers or furnaces. Because gas volume is affected by temperature and pressure, applications that require accuracy typically use measurement with a volume corrector.
Water: Pulse-Output Meters and Ultrasonic Flow Meters
Water is typically measured with pulse-output mechanical meters or with ultrasonic flow meters that clamp onto the outside of the pipe. Clamp-on ultrasonic devices can be commissioned without cutting the line, so there is no interruption to operations. Monitoring well water, mains water, process water and cooling tower make-up separately reveals both leaks and recovery opportunities that a single main meter would never show.
Compressed Air: Thermal Mass Flow Meters
Compressed air is often called the “fourth utility”, because its production cost hides inside the electricity bill. Air consumption is measured with thermal mass flow meters mounted on the distribution lines; these instruments report flow in normal cubic metres (Nm³), independent of pressure and temperature. Atasayın’s AV Sens compressed air and gas monitoring system performs exactly this measurement at line level and feeds the data straight into the platform — you can find it among our energy monitoring products. We explain how combining compressor electricity with air flow turns into an efficiency analysis in our article on compressor energy consumption and compressed air monitoring.
Steam: Vortex and Differential Pressure Flow Meters
In plants that use steam, consumption is typically measured with vortex or differential pressure (orifice) flow meters. Since steam flow depends strongly on pressure and temperature, accurate measurement requires temperature and pressure compensation. Steam data becomes truly valuable when it is combined with gas data to calculate boiler efficiency continuously.
| Utility | Typical Measurement Device | Typical Unit |
|---|---|---|
| Electricity | Power analyser + current transformer | kWh, kW, kVAr |
| Natural gas | Meter pulse output, turbine/rotary flow meter | m³, Sm³, kWh |
| Water | Pulse-output meter, ultrasonic flow meter | m³, L/min |
| Compressed air | Thermal mass flow meter (AV Sens) | Nm³, Nm³/h |
| Steam | Vortex / differential pressure flow meter | tonnes, kg/h |
The Advantages of a Single Platform: Cross-Utility Correlation
The real return on bringing every utility into one platform lies beyond individual charts — it lies in the relationships that can be built between resources. With separate systems, producing these insights means merging exports by hand; on a single platform, they are calculated automatically.
- Total energy per unit of production: When electricity, gas, water and air are converted to a common energy basis and divided by production output, the true energy cost of each unit produced emerges. This is the soundest foundation for comparing lines and shifts.
- Boiler efficiency: Tracking gas consumed against steam or heat produced on the same time axis allows boiler efficiency to be calculated continuously. A slow decline in efficiency signals a maintenance need long before the invoice grows.
- Compressor specific power: Dividing the electricity a compressor draws (kWh) by the air volume it delivers (m³) yields kWh/m³ — the health indicator of the compressed air system. A rising value typically points to leaks, clogged filters or an inefficient load/unload ratio.
- Unified reporting: The monthly energy report presented to management covers every utility in one document and one format, eliminating the burden of compiling separate reports from separate systems.
- A single carbon inventory: Each utility’s consumption is multiplied by its own emission factor, so the facility’s total carbon footprint is calculated on one platform with one consistent method.
The Downside of Separate Systems: Data Silos
A SCADA screen for electricity, a separate meter-reading application for gas, hand-kept spreadsheets for water and the compressor vendor’s own panel for air — this picture is familiar in many plants, and it is a classic data silo problem. Each system has its own interface, its own time resolution and its own report format; the data sits in different places and never talks to each other.
The cost of these silos is concrete. Data for the same period arrives from different systems at different intervals, making comparisons unreliable; reporting turns into days of spreadsheet merging; and cross-utility relationships — gas consumption rising while steam output stays flat, for instance — appear on nobody’s screen. Each system also carries its own maintenance, licensing and learning curve. Multi-utility energy monitoring replaces this fragmented structure with a single data model and a single interface, removing both the operational burden and the information loss.
What to Consider During Installation
The success of a multi-utility project depends largely on sound planning:
- Prioritisation: All utilities do not have to go live at once. The typical path is to start with the highest-cost resource — usually electricity and gas — and add water and air in stages.
- Measurement point selection: Main incomer metering gives the overall picture, but the real value lies in sub-metering large consumers such as boilers, compressors and major process lines.
- Matching device to utility: Every resource has its appropriate instrument class; temperature-pressure correction for gas, compensation for steam and normalised flow for air must not be neglected.
- Communication infrastructure: The architecture should be protocol-flexible, so that pulse, Modbus and IoT-based devices can all report into the same platform.
- Scalability: The system should be designed so that new meters, lines and even additional sites can be added later.
- A common time axis: Cross-utility correlation is only meaningful if all data is recorded with synchronised timestamps.
One Data Source for ISO 50001 and Carbon Reporting
The ISO 50001 energy management standard requires energy performance to be monitored and improved on the basis of measurable data — and its scope covers every significant energy type used on site, not just electricity. Energy reviews, energy performance indicators (EnPIs) and the energy baseline can only be established reliably when data from all utilities is collected in one place, at one quality level. A multi-utility platform is therefore the natural data backbone of an ISO 50001 implementation: during audits, consistent, timestamped records are presented from a single system.
The same logic applies to carbon. Corporate carbon footprint calculations and reporting obligations such as CBAM require direct emissions from fuels like natural gas alongside indirect emissions from purchased electricity. When all consumption data lives on one platform, each utility is automatically converted to its carbon equivalent using the appropriate emission factor, and the facility’s emission inventory is produced from a single source with a single method. The ATS Energy Monitoring System, developed by Atasayın Energy at Teknopark Istanbul, is built exactly on this approach: electricity, natural gas, water and compressed air are monitored on one platform, converted to carbon emissions and delivered through unified reports. The system is in use at the facilities of industrial companies such as Beko, Cargill and Gedik.
Frequently Asked Questions
Do all utilities need to be connected at the same time?
No. The typical approach is to start with the highest-cost utility and expand the system in stages. What matters is choosing a platform that supports every utility type from day one, so each new resource plugs into the existing infrastructure instead of requiring a new system.
Can my existing gas and water meters be connected to the system?
In most cases, yes. Meters with pulse outputs connect directly to the data acquisition unit, and meters supporting Modbus or M-Bus are read digitally. Where older meters have no output at all, devices such as clamp-on ultrasonic flow meters can be added without cutting the line.
Why measure compressed air separately — isn’t compressor electricity enough?
Compressor electricity only shows the cost of producing air; it says nothing about how much of that air actually reaches the points of use. Measuring air flow separately allows the specific power value (kWh/m³) to be calculated, and leaks, pressure losses and inefficient operation typically reveal themselves as a rise in this ratio.
How can data from different utilities be compared?
The platform records each utility in its own unit (kWh, m³, Nm³, tonnes) and converts it to a common energy basis or cost where needed. Because all data shares one time axis, combined indicators such as total energy per unit of production are calculated automatically.
Is multi-utility monitoring mandatory for ISO 50001 certification?
The standard does not mandate any specific software, but it does require all significant energy types to be monitored and performance to be demonstrated with data. A system that gathers every utility on one platform is typically the most practical way to meet these requirements with the least effort.
Monitoring electricity, natural gas, water and compressed air on a single platform makes the entirety of your energy cost visible, enables cross-utility efficiency analysis, and creates one reliable data source for ISO 50001 and carbon reporting. To plan the multi-utility energy monitoring infrastructure of your facility, get in touch with the Atasayın team.
For choosing the right flow meter type on water, steam and compressed air lines, see What Is a Flow Meter? Types and Selection Guide.