Energy Monitoring for Manufacturers: What Should You Actually Measure?

Manufacturing sites can have complex energy requirements. From production machinery and compressed air to heating, cooling and other essential systems, consumption can vary considerably between processes and operating hours.

But energy bills don’t always explain where or when that energy is being used. Without greater visibility, unnecessary running hours, unusual consumption and inefficient equipment can go unnoticed.

Energy monitoring helps manufacturers understand these patterns and identify where improvements could deliver value. The aim isn’t simply to collect more data, but to measure what matters for your operations.

Key Takeaways

• Energy bills provide limited visibility of consumption.
• Half-hourly data reveals daily energy patterns.
• Submetering identifies equipment-level energy use.
• Peak demand can influence electricity costs.
• Production data helps assess operational efficiency.

What Is Manufacturing Energy Monitoring and How Does It Work?

Manufacturing energy monitoring involves tracking and analysing how electricity, gas and other fuels are consumed across production processes and supporting systems. It helps manufacturers understand when and where energy is being used, identify unusual consumption and highlight opportunities to improve efficiency.

Unlike reviewing energy bills alone, monitoring provides greater visibility over how energy demand changes throughout the day.

How Does Manufacturing Energy Monitoring Work?

Energy monitoring starts with understanding how your site currently consumes energy. Utility meters provide an overview of electricity and gas usage, while half-hourly data can reveal changes in consumption throughout the day.

For more detailed insights, submetering can measure energy used by individual machines, production lines or supporting equipment. Monitoring software can then help identify patterns, peak demand and unusual consumption.

Comparing this information against production schedules and operating hours provides a clearer picture of where improvements may be possible.

How Is Energy Monitoring Different From an Energy Audit?

Energy monitoring provides ongoing visibility of consumption, while an energy audit examines how energy is used and identifies potential improvements.

The two can work together, with monitoring data supporting audit findings and helping manufacturers assess whether changes are delivering the expected savings.

Which Energy Measurements Matter Most for Manufacturers?

Not every energy measurement provides the same level of insight. Total electricity consumption can show how much energy your site uses, but it doesn’t necessarily explain when demand is highest or which processes are responsible. Measurements such as peak demand, out-of-hours consumption and equipment-level usage can provide a clearer picture of how energy is being used across your operations. Comparing consumption against production output can also help manufacturers understand whether energy is being used efficiently. The aim is to focus on measurements that support practical decisions rather than collecting data without a clear purpose.

Energy measurement	What it reveals	Why it matters
Electricity consumption (kWh)	Total electricity used	Tracks overall energy consumption
Electricity demand (kW)	Power required during an interval	Identifies demand patterns
Peak demand (kW)	Highest recorded demand	Supports capacity and cost assessment
Half-hourly consumption	Changes throughout the day	Highlights unusual usage
Out-of-hours consumption	Energy used outside production	Identifies potential waste
Equipment-level consumption	Energy used by individual systems	Supports targeted improvements
Energy per unit produced	Consumption relative to output	Helps assess operational efficiency

No single measurement provides a complete picture of manufacturing energy performance. High electricity demand may be necessary for certain processes, while consumption outside normal working hours could support essential equipment. That’s why energy data should be considered alongside production schedules, operating hours and the requirements of individual systems. Where whole-site data doesn’t provide enough detail, submetering can help identify which equipment or processes deserve closer attention. Reviewing these measurements regularly allows manufacturers to identify unusual patterns, investigate potential inefficiencies and make better-informed decisions about where energy improvements could deliver the greatest value.

How Can Energy Monitoring in Manufacturing Identify Unnecessary Consumption?

Energy monitoring in manufacturing can help businesses identify where electricity is being used unnecessarily, without affecting the performance of essential equipment or production processes.

Identify Out-of-Hours Consumption

Machinery and supporting systems may continue consuming electricity during breaks, overnight or between shifts.

Half-hourly data can highlight these patterns, helping manufacturers identify equipment that could be switched off. However, some systems, including refrigeration and safety equipment, may need to operate continuously.

Understand Peak Electricity Demand

Starting several machines simultaneously can create periods of high electricity demand, potentially affecting network charges and capacity requirements.

Monitoring can identify when these peaks occur and whether adjusting equipment schedules could help manage demand without disrupting production.

Monitor Individual Equipment

Submetering can provide greater visibility over energy-intensive systems, including compressors, motors, refrigeration and production machinery.

Unusual changes in consumption may indicate equipment or operating practices that require further investigation.

Compare Energy Use Against Production

Higher production volumes will often increase overall energy consumption, so rising usage doesn’t automatically indicate inefficiency.

Measuring energy consumed per unit produced can provide a more meaningful comparison, particularly when accounting for changes in product mix, operating hours and production conditions.

Which Manufacturing Systems Should Be Monitored First?

Monitoring every piece of equipment across a manufacturing site isn’t always practical or commercially worthwhile. The priority should be understanding which systems consume the most energy, how important they are to production and where existing data doesn’t provide enough visibility. Energy-intensive equipment may benefit from dedicated monitoring, while smaller systems can sometimes be monitored together. There’s no single approach that works for every manufacturer. The right priorities depend on your processes, operating hours and energy requirements.

Manufacturing system	What to monitor	Potential insight
Compressed air	Electricity consumption and operating hours	Unnecessary compressor operation
Production machinery	Energy use and idle periods	Standby consumption
Electric motors	Demand and operating patterns	Inefficient operation
Industrial heating	Fuel consumption and temperatures	Heat losses and control issues
Refrigeration	Electricity use and operating cycles	Unusual demand
HVAC	Consumption and operating schedules	Unnecessary heating or cooling
Production lines	Energy consumption per unit produced	Process efficiency

High energy consumption doesn’t automatically mean a system is operating inefficiently. Some equipment will naturally require more energy because of its role in production. Before investing in additional monitoring equipment, manufacturers should review the information already available and identify where greater detail would be useful. Submetering should help answer specific questions about equipment performance or consumption. Ultimately, the value comes from using monitoring data to inform maintenance, improve operating schedules and make better decisions about future energy investments.

Gain Greater Visibility Over Your Manufacturing Energy Consumption

Understanding where, when and how your manufacturing site uses energy is an important step towards improving efficiency and managing costs. While energy bills provide an overview of consumption, half-hourly data, submetering and production-based measurements can offer greater insight into how your operations perform.

The value comes from using that information to identify improvements, track performance and make better-informed decisions. Energy monitoring can also support wider planning, including equipment upgrades, commercial solar and battery storage.

Get in touch with The National Energy Hub to discuss your manufacturing site’s energy requirements and explore opportunities to improve visibility and control.

Frequently Asked Questions About Manufacturing Energy Monitoring

What is manufacturing energy monitoring?

Manufacturing energy monitoring involves regularly measuring and analysing electricity, gas and other energy consumption across production machinery, processes and supporting systems. It helps businesses understand where and when energy is being used.

Why is energy monitoring important for manufacturers?

Energy monitoring gives manufacturers greater visibility over their consumption. It can help identify unusual usage, unnecessary equipment operation and potential inefficiencies, supporting better decisions about energy costs and operational performance.

What energy data should manufacturers monitor?

Useful measurements include total electricity consumption, peak demand, equipment operating hours and energy used by individual processes. Comparing consumption against production output can also help manufacturers assess how efficiently energy is being used.

What is half-hourly electricity data?

Half-hourly electricity data records consumption in 30-minute intervals throughout the day. It helps manufacturers identify demand patterns, periods of unusually high usage and electricity consumption outside normal production hours.

What is energy submetering in manufacturing?

Submetering involves using additional meters to measure energy consumed by individual machines, production lines or supporting systems. This provides more detailed information than whole-site meters and can help identify where improvements may be worthwhile.

How can manufacturers identify out-of-hours energy waste?

Comparing half-hourly consumption data against production schedules can reveal equipment running unnecessarily during breaks, overnight or between shifts. However, essential systems such as refrigeration and safety equipment may need to operate continuously.

Can energy monitoring reduce manufacturing electricity bills?

Energy monitoring doesn’t directly reduce electricity bills, but it can highlight opportunities to avoid unnecessary consumption. Actual savings depend on the improvements implemented, their suitability for the site and how effectively they’re maintained.

What is the difference between kW and kWh?

Kilowatts (kW) measure electrical power or demand at a particular time, while kilowatt-hours (kWh) measure energy consumed over time. Both are useful for understanding manufacturing electricity usage and demand patterns.

How can manufacturers measure energy efficiency per unit produced?

Manufacturers can divide the energy consumed during a particular period by the number of units produced. However, comparisons should account for changes in product mix, operating hours and production conditions to provide meaningful results.

Is energy monitoring the same as an energy audit?

No. Energy monitoring provides ongoing information about consumption patterns, while an energy audit investigates how energy is being used and identifies potential improvements. The two can work together to support efficiency decisions and measure results.