Why sub-meter production lines?

A site meter shows only the total. Line meters show which lines, products and shifts use the most, so waste can be found and costs assigned fairly.

Which lines should be metered first?

Start with the largest and most variable consumers, and with any line where water, steam or air use is suspected to be high. Then fill gaps until the hierarchy reconciles.

Do we need to replace existing meters?

Usually not. Many panel meters, flow meters and BMS points can be read as they are. New meters are added only where gaps remain.

How does sub-metering help product costing?

With consumption per line and output per line, the utility cost of each product can be calculated from measured data rather than allocated by floor area or headcount.

Glossary

FMCG and manufacturing

What is Sub-metering by production line?

Definition

Sub-metering by production line means installing meters for electricity, water, steam, compressed air and gas on each line or process area, instead of relying on one site meter. It shows how much each line, product and shift really uses, so waste can be found and costs can be assigned to the products that cause them.

What it is

A single utility meter tells a plant how much it used, not where. Sub-metering splits that total into lines, process areas and major equipment, so energy and water can be compared with what each line produced.

A good sub-metering plan starts with the largest and most variable loads, uses existing meters and panel instruments where possible, and adds new meters only where gaps remain. Meters should reconcile with the main meter, so unaccounted use is visible.

Sub-metering enables line-level specific consumption, product costing, idle load detection and fair benchmarking between similar lines or plants.

Who it applies to / where it is used

Sub-metering is used in FMCG, food and beverage, dairy, personal care, pharmaceuticals and multi-unit manufacturing campuses. Plant heads, finance, sustainability teams and energy managers all use it, especially where several business units share one campus supply.

How it is measured / what evidence it needs

The evidence is a metering hierarchy that adds up: site meter, area meters, line meters and major equipment, each tied to production data.

Electricity by feeder, panel or line
Water, steam, compressed air and gas by line
Production output by line and shift
Reconciliation of sub-meters against the main meter
Specific consumption per unit produced, by line

How Aqueduct helps

Aqueduct builds the metering hierarchy as a digital twin, so every line's consumption reconciles against the site total.

aQ Core ingests existing meters over Modbus, BACnet, M-Bus, pulse and MQTT, and new meters through partners
aQ EnergySmart and aQ WaterGuard report consumption and specific consumption per line
Missing-data flags make unmetered or offline lines obvious
Weather-normalized and production-adjusted baselines make lines comparable