.png)
How to Choose Metering Points That Answer the Right Energy Questions
A meter in the wrong place can create more noise than value. It may show that a site used more electricity this month, but not why it happened, where it happened, or what decision should follow.
Good energy metering starts with a simple idea: place meters where the data will answer a question.
The best starting point is usually the incoming supply, then a small number of significant loads. From there, the system can grow in a controlled way. A factory might separate production, compressed air and refrigeration. A commercial property might separate tenancy loads from common services. The aim is not to meter everything on day one. The aim is to measure the parts of the site that drive decisions.
Start with the decision, not the device
Energy data is useful when it leads to a clear action. Before choosing a meter, ask what decision the measurement needs to support.
Useful questions include:
Is a process drawing more power than expected?
Does equipment stay energised outside operating hours?
Did a new process increase peak demand?
Are tenants using more energy than common services?
Is compressed air running when production has stopped?
Is refrigeration load stable, or does it change with operations?
Are overnight loads caused by normal plant operation or avoidable waste?
These questions shape the metering plan. A meter on the main incomer can show total site use. It does not show which load caused a change. A meter on every small circuit may create too much data without improving decisions. The useful middle ground is to measure the supply and the major load groups that explain most of the site’s energy behaviour.
A good rule is this:
If the reading changes, someone should know what to check next.
That rule keeps the metering plan practical. It also helps avoid a common problem where a site collects data for months but still cannot answer basic operational questions.
Begin at the incoming supply
The incoming supply is the first metering point because it gives the site baseline. It shows total demand and total consumption as seen from the point of supply. This point is useful for comparing against bills, checking demand trends and seeing the overall effect of site changes.
At the incoming supply, typical measurements may include:
Total kWh consumption
Demand profile over time
Peak demand
Phase current and voltage
Power factor, where relevant
Import and export, if the site has generation
This main meter gives the broad picture. It is the reference point for all downstream measurements. If submeter totals do not broadly align with the incoming supply, after allowing for unmetered loads and losses, the system may need checking.
The incoming meter can answer broad questions such as:
Did the whole site use more energy this week?
Did demand peak during production, start-up, or after hours?
Did a tariff or capacity charge change because of peak demand?
Did a solar or battery change affect import from the grid?
It cannot easily answer which machine, service, tenant, or process caused the change. That is why the next step is to select a small number of significant downstream loads.
Choose a small number of significant loads
The first round of submeters should focus on loads that are large, variable, costly, or operationally important. These are the loads most likely to explain changes in consumption or demand.
A practical first split may look like this:
Site type | Useful first metering points | Questions the meters can answer |
Factory | Production, compressed air, refrigeration, main services | Which process area drives demand, and what runs after hours? |
Cold storage | Refrigeration plant, defrost systems, handling equipment, amenities | Is refrigeration demand changing with operations or control settings? |
Commercial property | Tenancy loads, common services, lifts, HVAC, car park ventilation | Are costs driven by tenants or shared building services? |
Food processing site | Processing lines, chillers, boilers or heat pumps, compressed air | Did a process change alter energy use or peak demand? |
Warehouse | Lighting, battery chargers, HVAC, loading dock equipment | Are chargers or lighting running outside active shifts? |
This approach gives enough detail to act without making the system too complex too early.
The key is to choose load groups that have a clear operational owner. For example, production load may be linked to output. Compressed air may be linked to leaks, pressure settings and equipment left on. Refrigeration may be linked to setpoints, door openings, maintenance and ambient temperature. When a load has an owner, the data has somewhere to go.
Separate loads that behave differently
Meters are most useful when they separate loads with different operating patterns. If two loads behave in different ways, combining them can hide the signal.
For example, compressed air and refrigeration may both run across long periods, but the reasons for their energy use are different. Compressed air demand may point to leaks, pressure settings, inappropriate use of air, or equipment running outside shifts. Refrigeration demand may point to heat load, door management, controls, defrost timing or equipment condition.
If both are measured together, a change in one may be masked by the other.
Production loads
Production loads often vary by shift, product type, batch size or equipment selection. Metering these loads can help show whether energy use broadly follows output, or whether the process has a constant demand even when little production is occurring.
Questions to ask:
Does demand fall when production stops?
Does one product or process step change the load profile?
Did a new machine increase peak demand?
Are start-up procedures causing avoidable peaks?
Compressed air
Compressed air is often a strong candidate for early metering because it can run when production is not active. A compressor that remains energised overnight may indicate leaks, control issues, automatic drains, or equipment using air when it should be isolated.
Useful questions include:
Does compressed air demand drop after shutdown?
Does the load cycle overnight?
Did pressure changes affect energy use?
Is a new air tool or process changing the demand profile?
Refrigeration
Refrigeration usually needs a different lens. Some load outside work hours may be normal and necessary. The question is not simply whether it runs, but whether the pattern makes sense.
Good questions include:
Does demand rise during loading or production?
Are there unusual peaks during defrost?
Has demand changed after maintenance or control changes?
Is the load profile stable from week to week under similar conditions?
Common services and tenancy loads
In commercial properties, the first useful split is often between tenancy loads and common services. This can help with internal cost allocation, tenant discussions, operational reviews and identifying after-hours use.
Common services may include lifts, pumps, common area lighting, HVAC, car park ventilation and amenities. Tenancy loads may need to be measured by tenancy, floor, distribution board or agreed supply point.
The right split depends on how the building is wired and how the data will be used.
Place meters where wiring and responsibility meet
The best theoretical metering point is not always the best practical point. Electrical distribution, switchboard space, current transformer access and communications all affect the final design.
A useful metering point should satisfy three conditions:
The circuit represents the question
The meter should measure the load or group of loads being investigated. If the circuit includes unrelated loads, the data may be harder to interpret.
The installation is practical and safe
There must be suitable access, space and electrical conditions for the meter and current transformers. Electrical work must be carried out by suitably qualified people.
The data can reach its destination
A meter is only useful if the readings can be collected, stored and viewed in a form that supports decisions.
This is where a site assessment matters. ProSense can assess the equipment and data pathway for the site, including where meters can be installed, what current transformers are required and how communications should be arranged.
An Acrel metering solution can combine appropriately selected meters, current transformers and communications. The selection should match the electrical arrangement and the data requirement, not just the number of circuits.
Match the meter to the measurement
A meter is part of a measurement chain. That chain includes the supply, the circuit, the current transformers, communications hardware, configuration and the software or destination that receives the data.
Choosing the meter means checking what needs to be measured and how the data will be used.
Common selection factors include:
Single-phase or three-phase measurement
Direct connection or current transformer measurement
Current transformer ratio and accuracy needs
Available switchboard space
Display requirements at the board
Logging or interval data requirements
Communications method
Integration with a gateway, platform or building system
Environmental conditions around the board
For many commercial and industrial sites, current transformer selection matters as much as meter selection. The current transformer must suit the conductor size, current range and installation conditions. The ratio must match the meter configuration. If a CT ratio is entered incorrectly, the data can look precise while being wrong.
That risk is one reason to treat commissioning as part of the project, not an afterthought. A meter should be checked against expected load, phase orientation and known operating conditions before the data is trusted.
Do not assume wireless means automatic
Meter connectivity varies by model. A device described as wireless still needs the correct network and destination configured. Wireless can reduce cabling in some situations, but it does not remove the need for planning.
The data pathway may include:
The meter
A gateway or data logger
A wireless network or wired connection
A local system, cloud platform or monitoring portal
User access and reporting settings
Each link needs to work. Site conditions can also affect communications. Switchrooms, metal enclosures, distance, interference and building materials can all influence signal quality. A wired protocol may suit some sites. A wireless option may suit others. Some systems may use a mix of both.
The right question is not “Is it wireless?” The better question is:
Can this meter send reliable data to the place where decisions are made?
This includes the practical details, such as network credentials, signal strength, gateway location, data intervals and whether the platform expects data in a particular format.
Keep the first stage simple enough to use
A first-stage metering system should give clear answers without overwhelming the people who use it. Too many meters can create a maintenance and interpretation burden. Too few meters can leave the site guessing.
A practical first stage often includes:
One meter on the incoming supply
A small number of meters on major load groups
Clear names for each metered circuit
A simple dashboard or reporting structure
A plan for checking data quality after installation
A short list of decisions the data will support
Good naming matters. A label such as `DB-3 Meter 2` may be clear to the installer but unclear to an operations team. A label such as `Compressed Air Main Supply` is easier to understand and discuss.
The same applies to dashboards and reports. The first view should show the main questions, not every available parameter. Detailed electrical values still have their place, especially for engineering review, but routine users usually need trends, comparisons and alerts that relate to operations.
Build a metering plan that can grow
A good metering plan allows for future expansion. The first installation may focus on major loads. Later stages may add specific machines, production lines, tenants or plant items once the first data reveals where more detail is needed.
A staged plan may look like this:
Stage | Focus | Purpose |
Stage 1 | Incoming supply and major loads | Establish the baseline and identify the largest drivers |
Stage 2 | Important sub-loads within one area | Explain changes found in stage 1 |
Stage 3 | Specific equipment or process lines | Support targeted improvement, verification or allocation |
Stage 4 | Alerts and reporting rules | Help site teams respond faster to unusual patterns |
This staged approach keeps cost and complexity aligned with value. It also gives time to learn from the data before adding more meters.
For example, a factory may start with incoming supply, production, compressed air and refrigeration. If the compressed air meter shows high overnight demand, the next stage might involve metering individual compressor circuits or major air-using areas. If refrigeration demand changes after a process modification, the next stage might separate compressors, condensers or defrost circuits where the electrical design allows.
The point is to let the first measurements guide the next ones.
Check whether each meter earns its place
Before installing a meter, test it against a short checklist.
Ask:
What question will this meter answer?
Who will use the answer?
What action could follow?
Is this the best point in the electrical system to measure it?
Are unrelated loads included on the circuit?
What current transformers are needed?
How will the data be collected?
How will the meter be named in reports?
How will the reading be checked after installation?
If a meter cannot pass this test, it may still be useful later, but it may not belong in the first stage.
This checklist also helps when reviewing an existing metering system. Many sites already have meters installed, but the data may not be used. Sometimes the issue is not the meter itself. It may be poor labelling, missing communications, unclear dashboards or measurements that do not line up with operational decisions.
What a good measurement plan looks like
A strong metering plan is easy to describe. It does not need a complex explanation.
For a factory, it might be:
Measure total site demand at the incoming supply.
Separate production, compressed air and refrigeration.
Check after-hours demand for each major load.
Review whether new equipment changes peaks or daily consumption.
Add more meters only where the first stage shows a need.
For a commercial property, it might be:
Measure total site use at the incoming supply.
Separate tenancy loads from common services.
Meter major shared services such as HVAC, lifts and car park ventilation where practical.
Use reports to support allocation, after-hours reviews and plant scheduling.
Expand by floor, tenancy or plant item if the data supports it.
In both cases, each meter has a job. It answers a question, supports a decision and fits into a data pathway that has been planned from the start.
The right metering points turn energy data into site knowledge. Start at the incoming supply, add the significant loads, and make sure every meter explains something worth acting on. Then choose the meters, current transformers and communications to suit the site, rather than forcing the site to fit the hardware.
