DUoS

DUoS charges pay for the maintenance, operation, and development of the local electricity cables, substations, and equipment that deliver power to your premises. These are the networks run by the 14 regional DNOs, and each region has different rates based on their specific costs.

Your DUoS bill has several components:

• Unit rates vary by time of day - Red (peak, most expensive), Amber (daytime), and Green (nights and weekends, cheapest)
• Fixed charges - a daily standing charge per meter
• Capacity charges - for larger supplies, based on your agreed maximum demand in kVA
• Reactive power charges - if your electrical equipment isn't operating efficiently

These charges are passed through by your energy supplier and appear on your bill, though they may be bundled into your overall unit rate rather than shown separately. Understanding DUoS is key to identifying billing errors, as the wrong tariff category can significantly affect what you pay.

Common billing errors:

• Wrong LLFC-to-tariff mapping (most common)
• Incorrect time band allocation (kWh in wrong Red/Amber/Green bucket)
• Outdated rates after April tariff changes
• Incorrect capacity band applied