What is peak load?
Direct answer
Peak load is the highest power in kilowatts that your connection draws or feeds in at any single moment. It is not your total consumption over a month that sets the peak, but the one instant when the most devices run at the same time. That momentary peak determines how much transport capacity you need and how heavily you load the grid.
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What is peak load: scattered information versus Energy Intelligence
Anyone managing an electricity connection often looks at consumption in kilowatt-hours on the bill. For the grid, something else counts: the moment when demand is highest. Think of a business premises where the heating, cooling, charging points and machines all start at the same time in the morning. That simultaneity briefly pushes the power up. Peak load matters to every business with machines, cooling or charging points, and it grows more important as the electricity grid fills up.
- Peak load is a power in kilowatts at a moment, not a quantity of energy in kilowatt-hours over a period.
- The peak arises when many devices switch on together, with motors and compressors briefly drawing extra power at startup.
- Your contracted transport capacity is set to that peak, so a high peak requires a heavier and more expensive connection.
Insight
Traditional approach
Information is scattered across portals, documents, invoices or separate spreadsheets.
Modern approach
Data, context and interpretation are brought together into a clear decision picture.
Decision-making
Traditional approach
Choices are made based on averages, assumptions or occasional analyses.
Modern approach
Scenarios, KPIs and current measurement data make the trade-off more concrete and repeatable.
Follow-up
Traditional approach
Actions often stay non-committal or disappear into separate reports.
Modern approach
Follow-up actions, monitoring and reporting are linked to the same energy data.
How does a peak arise?
A peak arises from simultaneity: several devices demanding power at the same moment. Twenty devices running spread across the day produce a low peak. The same twenty devices switching on together at eight in the morning produce a high peak. On top of simultaneity comes the inrush current. Electric motors, compressors in cooling systems and pumps briefly draw far more power when switched on than during normal running. That short startup peak can be a multiple of the normal power. If you measure power per quarter hour, you see the peak as the highest quarter-hour value of the whole month. That value determines how heavy your connection must be.
- Simultaneity is the main cause: devices switching on together add up to a high peak.
- Inrush currents from motors, compressors and pumps briefly create an extra high load.
- The peak is the highest measured quarter-hour value, not the average over the day.
- A single moment of simultaneity sets the peak for a whole month.
Why is a high peak expensive and limiting?
Your grid operator does not only account for your energy consumption, but reserves transport capacity for your peak. That contracted transport capacity determines the size of your connection and a large part of your network costs. A high peak therefore means a heavier and more expensive connection, even if you reach that peak only rarely. Grid congestion adds to this. In many places the grid is full: more electricity is transported than the grid can handle. In such an area your grid operator cannot allocate extra transport capacity, so you cannot expand or make your operations more sustainable. Whoever limits their peak sometimes fits within the existing connection and avoids a waiting list.
- The grid operator reserves transport capacity for your peak, not for your average consumption.
- A large part of network costs depends on the size of the connection, and so on the peak.
- In an area with grid congestion, extra transport capacity is often not available.
- A lower peak can enable expansion within the connection you already have.
What can you do about peak load?
The core is flattening the peak, also known as peak shaving. Start with insight: measure when your peak occurs and which devices contribute to it together. Often a handful of large consumers turns out to be responsible. Spreading is the first step: do not let machines, charging points or cooling cycles all start at once, but distribute them over time. Where spreading is not enough, you can adjust power with storage: a battery absorbs the peak and recharges at quiet moments. A capacity-limiting contract with your grid operator also helps, in which you agree to cap the peak during certain periods. In this way you lower the demanded peak without reducing your total production or consumption.
- Measure your peak moments and find out which devices cause the peak together.
- Spread the switching on of large consumers across the day instead of simultaneously.
- Use a battery to absorb the peak and recharge during quiet moments.
- Consider a capacity-limiting contract in which you cap the peak during agreed periods.
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