30-Second Overview
Supplier Capacity Charges are a key part of Irish business electricity bills. They reflect the maximum electricity your business can draw from the grid at any time, ensuring security of supply.
In this article, we explain how these charges are calculated and how managing them can help businesses avoid unnecessary costs.
⚡ To make sure that your business is on the best electricity rate, or to compare prices from all suppliers, upload a recent electricity bill using the link below, and our energy experts will analyse it for free. No obligation for you, just savings insights 👇
What are Electricity Supplier Capacity Charges?
A Supplier Capacity Charge (SCC) is the portion of your electricity bill that reflects the maximum level of electricity your meter is allowed to draw from the grid at any one time. You pay this charge whether you use the full capacity or not, because the grid operator must keep that level of capacity available for you. In simple terms, the more electricity capacity your site requires at peak times, the higher your Supplier Capacity Charge.
Why do Supplier Capacity Charges Exist?
Capacity charges exist to:
- Guarantee that power stations remain available;
- Cover costs of maintaining system reliability;
- Ensure businesses pay proportionally to the strain they place on the system.
This charge applies mainly to medium and large business users (DG5, DG6, or half-hourly metered customers), but all businesses should be aware of its impact.
You can read more about the different DG codes in our "Electricity Meter Categories - DG & MCC Codes Explained" article.
How is the Supplier Capacity Charge Calculated?
The charge is calculated by multiplying your MIC (in kVA) by a regulated capacity tariff rate set annually by the CRU (Commission for Regulation of Utilities). The SCC is based on several factors:
- Maximum Import Capacity (MIC): The agreed kVA capacity limit set for your premises.
- Actual Demand: The highest half-hourly demand recorded for your site.
- Capacity Tariff Rate: Published annually by the Commission for Regulation of Utilities (CRU).
| Supplier Capacity Charge (SCC) – Simplified Formula |
|---|
| SCC = Maximum kVA Demand × Capacity Tariff Rate |
💡 For example: If your MIC is 200 kVA and the tariff is €49.28 per kVA per year (or approximately €4.10 per month), your monthly capacity charge 👉 200 × 4.10 = €820
If your actual usage exceeds your agreed MIC, penalties or higher charges may apply. You can read more about the Maximum Import Capacity in our "What Is the Maximum Import Capacity (MIC)?" article.
Why Do Supplier Capacity Charges Matter for Businesses?
- Cost Control: Businesses with unnecessarily high MIC values will overpay on Supplier Capacity Charges.
- Energy Efficiency: Reducing your business energy consumption during peak periods can lower your charges.
- Operational Planning: Understanding Supplier Capacity Charges can help your business align operations with cost-saving strategies.
- Budgeting: These charges can represent a significant portion of your energy bill, especially for manufacturing, data centres, or large retailers.
Managing & Reducing Supplier Capacity Charges
Businesses can optimise their electricity supplier capacity charges through:
- Reviewing MIC Regularly: Ensure your agreed level matches your actual demand. We offer a step-by-step guide on how to optimise your MIC.
- Heavy Consumption Management: Plan accordingly to avoid simultaneous use of high-consumption equipment.
- Energy Efficiency Measures: Upgrading to more efficient equipment and operations in your business can help you save.
- Demand-Side Response: Some businesses can participate in grid schemes to reduce demand at peak times.
Utilityfair can assist by reviewing your capacity setup, checking whether your MIC is appropriate, and ensuring your tariff is the best fit for your usage profile.
How Utilityfair Can Help You Save Money on Business Electricity Bills
Utilityfair's energy experts look at the entire structure of your business energy bill, including Supplier Capacity Charges, to ensure you have the best business electricity deal at all times.
It's completely free. By analysing your MIC, usage profile, and tariff codes, we can help your business secure the cheapest electricity and gas deals across all Irish suppliers.
👉 Ready to Start Saving?
Fill out our enquiry form, click the link below or call 01 547 0999 to speak with a Utilityfair energy expert and start saving.
Frequently Asked Questions (FAQs)
Supplier Capacity Charges (SCC) are applied to business electricity bills based on the maximum capacity your site requires from the grid.
SCC = Maximum Import Capacity (kVA) × Capacity Tariff Rate.
The CRU sets the tariff annually, and charges apply whether or not you use your full capacity.
Energy charges are based on the amount of electricity you consume (kWh). On the other hand, capacity charges are based on the maximum demand you could place on the system (kVA).
Yes. By aligning your Maximum Import Capacity (MIC) with your actual demand, improving energy efficiency, and managing peak loads effectively.
You may face penalty charges or higher capacity costs, making it essential to keep your MIC under review.
The charge reflects the maximum demand your business places on the grid. It ensures that infrastructure is in place to handle peak usage - even if you don’t use that capacity all the time.
The Commission for Regulation of Utilities (CRU) sets tariff rates annually. Your Maximum Import Capacity (MIC) can also be reviewed if your business expands or your energy use decreases.
