Energy management: an introduction for beginners

In recent years Ukrainians have learned more about energy than they ever wanted to: outage schedules, generators outside cafés, power banks in every bag. For a business the question is even sharper. Energy means a lot of money, the risk of production stopping and, more and more often, a requirement from EU partners. Energy management is about handling energy as systematically as you handle finance or quality. Let’s look at what it is made of.

What energy management is

Energy management is the systematic control of how much, when and from where a business gets its energy. Not a one-off swap of light bulbs, but an ongoing process: measure, find the losses, improve, check the result, repeat.

Why it matters

• Money. In many plants energy is one of the biggest costs after raw materials and wages. A kilowatt-hour saved is pure profit.
• Resilience. After the attacks on Ukraine’s power system, businesses with their own generation, batteries and a plan for outages kept working while others stood idle.
• Market requirements. Large customers ask for carbon footprint reports, and through CBAM the EU has started charging for emissions “embedded” in imports of steel, aluminium, cement and fertilizers. For exporters, energy efficiency has become a matter of competitiveness.
• Climate. The cleanest energy is the energy you never had to produce.

“You can’t manage what you don’t measure”

Energy management starts with metering. A single main meter at the entrance only shows the total. To understand where energy goes, you install submeters on individual shops, lines and compressors, and collect the data automatically.

Then you define:

• A baseline: how much the business consumes now under normal conditions. Every improvement is compared against it.
• Energy performance indicators: for example, kWh per tonne of product. Absolute consumption may rise because output rose, while the specific figure falls, and that is a good result.

Once the data is there, it usually turns out that most energy goes to a few things. In industry these are above all electric motors: pumps, fans, compressors, conveyors. By International Energy Agency estimates, motors use about two-thirds of industrial electricity. Then come heating, compressed air, lighting, ventilation and air conditioning.

Energy management as a cycle

The international standard ISO 50001 describes an energy management system as an endless cycle:

1. Plan. Find the biggest consumers, estimate the savings potential, set concrete targets.
2. Do. Put the measures in place.
3. Check. Measure the result and compare it with the baseline.
4. Act. Keep what worked and move on to the next round.

Not everyone needs ISO 50001 certification, but the logic of the cycle is useful to any business, even a small one.

Quick wins

Some measures pay back within months:

• Compressed air leaks. Compressed air is one of the most expensive forms of energy in a plant, and in a typical facility a large share of it simply leaks out through loose fittings. Finding leaks with an ultrasonic detector costs very little.
• Variable frequency drives. A pump or fan often runs flat out while the flow is throttled with a valve. For such machines power drops roughly with the cube of speed: cutting speed by 20% cuts consumption almost in half.
• Smart schedules. Turn off equipment, lighting and ventilation when they are not needed, automatically, not “last one out switches off.”
• Modern lighting with occupancy sensors.
• Heat recovery. Heat from compressors and furnaces can be used for space heating or hot water.

When, not just how much

Energy costs different amounts at different times. For businesses, not only kilowatt-hours matter but also peak power: exceeding the contracted capacity is expensive, and the grid may simply not cope.

This is where energy storage systems (batteries) help: they charge when energy is plentiful or cheap and release it at the peak. Another tool is load shifting: moving energy-hungry operations to times when energy is cheaper or when your own solar panels are producing.

Microgrids: your own small power system

A microgrid is a group of energy sources and consumers that work as a single whole and can, when needed, disconnect from the main grid. Solar panels, a battery, a generator and the external grid are connected to a common busbar, and an energy management system (EMS) decides every second where to take energy from and where to send it.

When the external grid goes down, the microgrid switches to island mode and powers at least the critical loads. For Ukraine, where the power system is under constant attack, this is no longer exotic but a practical resilience tool. Microgrids will get their own articles in this section.

Where the field is heading

• Distributed generation. The power system is moving from a few large power plants to thousands of small sources, and businesses are becoming producers as well as consumers.
• Flexibility as a service. A business that can quickly cut or raise its consumption helps balance the grid, and can earn money doing so.
• AI for forecasting. Artificial intelligence models forecast consumption and solar output to plan battery operation better.
• Electrification of heat. Heat pumps are replacing gas boilers, and where possible, industrial heating is moving to electricity too.

How to get started

1. Find a year of your energy bills and plot a simple month-by-month chart. Look for anomalies.
2. Walk through the plant outside working hours. Anything that hums, glows or hisses when nobody is there is a candidate for savings.
3. Install at least a few submeters on the biggest consumers.
4. Calculate the payback of one measure, for example a drive on your largest pump.

Energy management is closely tied to the other topics on this blog: automation collects the data, and energy management systems need solid cybersecurity. In the next articles we will look at microgrids and the IEC standards for them.