Peak Shaving: Reduce Electricity Costs Efficiently

To understand the concept of Peak Shaving, it is crucial to first understand how electricity is billed to Commercial and Industrial users in specific parts of the globe.

Electricity demand charges are fees that companies pay based on their peak electricity usage during a specific period. Unlike energy consumption measured in kWh (total electricity used), demand charges are calculated based on maximum power drawn from the grid in kVA—typically measured during 15-minute or 30-minute intervals throughout your billing cycle.

How it works: If your facility draws 500 kVA for 14 minutes and then spikes to 800 kVA for just 2 minutes, your demand charge for that entire period is based on the 800 kVA peak—not your average consumption. This single spike can significantly impact your monthly electricity bill, especially for facilities with high power needs during short periods.

Here's a detailed look at how these charges affect companies in Germany, the UK and Italy:
 

Germany: The 7,000-Hour Rule

In Germany, the 7,000-hour rule is a regulation that allows energy-intensive companies to pay reduced grid charges if their facilities reach at least 7,000 full load hours per year and have a minimum annual consumption of 10 GWh. Full load hours are calculated by dividing total annual energy consumption of a company by its peak power load on the same period. Hence, the higher the peak power load, the less full load hours it will have. On the other hand, low peak power load will result in increased numbers of full load hours.

This rule is particularly beneficial for really high power intensive industries such as metal processing, paper, automotive and glass manufacturing, where energy costs are a significant part of operational expenses. By meeting these criteria, companies can reduce their grid charges by up to 80%, leading to substantial savings.

This 7,000-hour rule help utilities ensure major energy consumers smooth their power load at all times over the year, avoiding power grid stress and major transmission and distribution issues. In this way, they encourage major energy consumers to reduce pression on the utility grid to ensure a reliable power supply to every energy user.
 

United Kingdom: Demand Charges

In the UK, electricity demand charges are part of the Transmission Network Use of System (TNUoS) charges, which recover the costs of installing and maintaining the transmission system.

These charges are calculated based on the maximum power usage during peak periods on a monthly basis. For highest energy consumers in the UK with power load exceeding 100kVA multiple times per year, monthly demand charges will represent £7.26/kVA on the 2025/2026 period. For a 15MVA industry plant, it represents £108,900/month and more than £1.2 million/year only in demand charges, without even considering electricity prices.
 

Electricity Demand charges across Europe

Across Europe, electricity demand charges vary but generally follow similar principles. Companies are charged based on their peak usage, and for them, managing these peaks can lead to significant cost savings. Countries like Germany, UK and Italy have specific regulations to help energy-intensive industries manage these costs effectively.

Peak shaving delivers value across three critical dimensions: financial savings, operational resilience, and environmental impact.

Reducing Demand Charges and Grid Fees

Implementing strategic peak shaving can lead to substantial cost reductions in 2025. A manufacturing facility using Socomec's Battery Energy Storage System in a country with high demand charges can save big on grid fees by maintaining peak power demand drawn from the grid under a set threshold.

Consider these proven methods for maximising savings:

• Load monitoring automation and Smart load distribution:Advanced systems predict usage patterns and adjust power consumption accordingly. For example a smart strategy could consist in spreading power-intensive operations across different time windows, like using electric heating units or coolers during the morning and stock the energy in form of temperature during peak hours.
• BESS optimisation: Strategic energy storage deployment during peak hours to take on power supply once a high threshold is exceeded.
• Installing Renewable Energy:
• Incorporating renewable energy sources, such as solar or wind power, to supply power during peak times
   

Optimising Energy Costs During Peak Hours

The beauty of using a BESS for peak shaving lies in its ability to integrate multiple energy use strategies, thereby maximising savings. One such strategy, often employed alongside peak shaving, is Electricity Tariff Management. This approach involves storing energy during off-peak hours when tariffs are low and then using it during peak hours when prices surge. Dynamic pricing models make BESS particularly valuable during peak hours, when electricity rates can increase significantly compared to base rates. Manufacturing facilities equipped with BESS solutions can effectively reduce their power draw from the grid during these expensive periods.

As energy consumption becomes increasingly electrified, the use of Battery Energy Storage Systems (BESS) is becoming more essential for efficient energy management. The combination of BESS with electrical heat pumps for example creates effective synergies in energy management. The stored energy can power these systems during peak demand, helping maintain operations while avoiding premium rates.

Additionally, facilities operating electric vehicle charging stations can also particularly benefit from this approach. By utilising stored power from batteries during high-rate periods, businesses can maintain their charging capabilities while managing costs efficiently.
 

Long-term ROI of Peak Shaving Solutions

The return on investment for peak shaving implementations consistently demonstrates strong value over time. According to verified case studies from Socomec Battery Energy Storage Systems customers, the financial benefits extend beyond direct cost savings, indeed businesses can achieve cost recovery through reduced utility charges but also enhanced operational efficiency thanks to a better electrical signal in their facility with the battery acting as a buffer between the grid and electrical equipment inside the facility:

• Enhanced Equipment Longevity: A stabilised power supply reduces wear and tear on electrical equipment, leading to longer lifespans and fewer replacements.
• Reduced Maintenance Costs: Higher electric signal quality in the building protects sensitive electrical equipment from voltage fluctuations and power surges; therefore minimising the need for frequent repairs and maintenance, resulting in lower overall maintenance costs.
• Improved Operational Reliability: With a more stable and reliable power supply, operations run more smoothly, reducing downtime and increasing productivity.
• Potential qualification for energy efficiency incentives if collocated with renewable energies.

While specific ROI periods vary based on factors such as:

• Demand charge price level and grid fees
• Peak load
• Peak demand patterns
• Local energy prices
• Local billing methods
• Energy consumption
• BESS system capacity and nominal power

For detailed ROI calculations specific to your facility, it's recommended to conduct a comprehensive energy audit and consult with Socomec ESS engineers who can analyse your existing consumption and peak power patterns, local utility rates and size the most profitable BESS according to this information.

Additionally, modern peak shaving systems, when collocated with renewable energy production, serve a pivotal role in environmental impact reduction. Through optimised energy storage and usage optimisations strategies, facilities decrease and control their electricity bills while maintaining production levels. Furthermore, this sustainable approach often qualifies businesses for green energy incentives, further improving long-term financial returns.

What is solar peak shaving?

Solar peak shaving combines photovoltaic generation with BESS to reduce maximum power consumption from the grid. This integrated approach stores excess solar power during daylight hours for deployment during high-demand periods.

A manufacturing facility utilising this method might generate excess energy through solar panels at midday, storing surplus production in batteries for use during afternoon production peaks. This dual-source strategy maximises self-sufficiency and therefore reduces grid dependence.

A typical solar array paired with Socomec's storage solution can accordingly reduce peak loads while maintaining consistent power supply and quality.

Demand charges are a common practice worldwide, involving penalties for businesses that exceed their peak consumption limits. Across North America, Europe, Asia, and Latin America, tariff structures differ, but they share common objectives: to stabilise the electrical grid, promote balanced electricity consumption, and allocate the cost of maintaining grid infrastructure to major power users.

For businesses, it is crucial to manage their electricity consumption efficiently during peak periods to avoid significant surcharges. Optimising energy usage or using load shifting methods are some strategies employed to reduce expenses related to demand charges.

For companies wishing to make a big step in managing or reducing their energy bill, the integration of Battery Energy Storage Systems (BESS) play a key role in reducing peak demand. Peak shaving with a Battery Energy Storage System involves reducing energy consumption during high-demand periods by using stored energy to smooth the load curve of the power drawn from the grid.

In conclusion, managing demand charges by adopting strategies such as peak shaving with BESS is essential for businesses to control their energy costs and contribute to a more stable electrical grid, especially as the electrification of energy usage increases globally.