Power peaks are the biggest hidden cost lever in commercial operations
Every kilowatt-hour counts – but for commercial customers with power metering, not only the total quantity determines the electricity bill, but above all the highest 15-minute power value per month or year. This single peak determines the so-called demand charge, which often accounts for 30 to 50 percent of the total grid costs.
The good news: these load peaks can now be elegantly avoided with a modern battery storage system. The principle behind this is called Peak Shaving – and it is one of the most lucrative applications for commercial storage systems. Companies and agricultural businesses that implement Peak Shaving properly often reduce their annual grid costs by a high four to five-figure amount.
What is Peak Shaving? The definition in one sentence
Peak Shaving refers to the targeted capping of short, particularly high electricity consumption peaks through the use of a battery storage system, so that the maximum power drawn from the grid remains low and thus grid charges are reduced.
Simply put: If the operation temporarily draws a lot of electricity, for example when a large motor starts up, when several cooling units start in parallel, or when the feed mixer starts up, the storage system delivers the additional power exactly at that second. The grid "sees" only the consistently low base load, not the peak. The operation saves on the demand charge without any consumer having to be switched off or delayed.
Why load peaks are so expensive for commerce and agriculture
Grid operators bill companies with registered power metering (RLM) two components: an energy charge (€ per kWh consumed) and a demand charge (€ per kW of the annual peak value). The demand charge ranges between €80 and €180 per kW per year, depending on the grid area.
A practical example: A company with an average base load of 60 kW, but a single 15-minute peak of 180 kW, pays the demand charge on 180 kW – so quickly €20,000 per year just for this single peak. If the peak were capped at 90 kW, the costs would be halved. This is where Peak Shaving comes in: The storage system absorbs the top 60–90 kW of the peak, and the grid draw remains permanently low.
How Peak Shaving works in detail
At its core, Peak Shaving requires three components that interact precisely: an intelligent metering system, a battery storage system with sufficient power, and an energy management system (EMS) that decides in real-time when the storage system kicks in.
The metering system records the grid draw every second. As soon as consumption exceeds a defined threshold – for example, 90 kW – the storage system automatically delivers the difference. The power class is crucial: a storage system with high output power also caps hard, short peaks, while smaller systems only smooth out moderate fluctuations. The capacity, in turn, determines how long and how often Peak Shaving is possible per day.
This is precisely why powerful commercial storage systems such as the MONA Island 233 with 105 kW output power and 233 kWh capacity are the typical choice for medium-sized commercial and agricultural businesses with peak loads of up to approx. 100 kW. For larger industrial companies, agricultural cooperatives, or biogas combined operations with peak loads exceeding 120 kW, the MONA Island 418 with either 125 or 215 kW power reliably handles the task – and reliably caps even hard start-up currents of large machines.
Who particularly benefits from Peak Shaving?
Peak Shaving unfolds its full economic benefit wherever RLM metering is present (from approx. 100,000 kWh annual consumption) and where short, sharp load peaks occur in the operational process. This is typically the case for:
- Dairy farms with milking robots, milk cooling, and electric feed mixers
- Fruit and vegetable farms with cold storage and sorting systems
- Manufacturing businesses with welding systems, compressors, or injection molding machines
- Bakeries, butcher shops, and food crafts with ovens and cooling units starting in parallel
- Logistics and charging parks with multiple fast-charging points
- Hotels, wellness, and tourism businesses with strong consumption peaks during peak hours
The more uneven the load profile, the greater the leverage. Anyone who requests their annual load profile from the grid operator and looks at the three highest 15-minute values can often recognize the savings potential at first glance.
Bonus: Peak Shaving and PV self-consumption combined in one storage system
The most elegant aspect of modern commercial storage systems: They master Peak Shaving and PV self-consumption optimization simultaneously. During the day, they store surplus solar power, at night they supply the base load, and as soon as a load peak rolls in, they deliver full power to the building's grid.
This dual role is precisely what makes systems like the MONA Island 233 and MONA Island 418 so economical: a single storage system pays for itself through three parallel levers – higher self-consumption, capped load peaks, and, if necessary, emergency power. The interaction is automatically controlled by the cloud-based energy management system MONA Connect, which dynamically prioritizes self-consumption, Peak Shaving, and grid stabilization strategies.
Calculation example: Peak Shaving in practice
A production company in Baden-Württemberg with an annual consumption of 450,000 kWh previously had an annual peak load of 175 kW. At a demand charge of €125/kW, that's €21,875 per year for the demand component alone.
After installing a MONA Island 233 with Peak Shaving programming, the peak is systematically capped at 95 kW. New demand charge: 95 kW × €125/kW = €11,875 per year. Savings: €10,000 annually – just from Peak Shaving.
In addition, there are savings of €12,000–€18,000 from additional PV self-consumption (the company's PV system produces 220,000 kWh/year) as well as the safety benefit from the emergency power function. The amortization of the storage system is therefore less than six years – with a lifespan of 15+ years.
MONA Connect: Peak Shaving automatically and predictively
Peak Shaving is only as good as the software that controls it. MONA Connect, as a cloud-based EMS, monitors grid draw in real-time, learns the typical load patterns of the operation, and detects rolling peaks as soon as large consumers start up – even before they reach the meter. Additionally, it uses weather and production data to optimize the storage level: enough reserve for Peak Shaving, while also storing as much PV power as possible. The result is a storage system that automatically maintains the most economical profile 24/7.
Conclusion: Peak Shaving is currently one of the most profitable storage applications
Peak Shaving transforms short, expensive power peaks into a permanent savings lever – making it one of the most lucrative applications of modern battery storage systems. In combination with PV self-consumption and emergency power capability, the storage system amortizes significantly faster than in any single application.
Whether a production company with hard starting currents or a dairy farm with cyclical cooling: a professionally configured MONA Island 233 or MONA Island 418 delivers power exactly when the demand charge would otherwise explode. We would be happy to analyze your current load profile and show you, down to the exact euro, your individual Peak Shaving savings potential.