Pass-Through Charges

Pass-through charges are costs that your energy supplier doesn't control - they simply collect them from you and pass them on to the relevant network operators or levy administrators. Understanding these charges is key to identifying billing errors.

Common pass-through charges:

• DUoS - Passed to your regional DNO
• TNUoS - Passed to National Grid ESO
• BSUoS - Passed to National Grid ESO
• Capacity Market - Passed to LCCC
• CfD Levy - Passed to LCCC
• CCL - Passed to HMRC

How pass-through appears on bills: On "pass-through" or "cost-plus" contracts, these charges appear as separate line items. On "fixed price" contracts, they're bundled into your unit rate and you may not see them itemised.

Why pass-through contracts matter:

• Transparency - You can see exactly what you're paying for each charge
• Risk transfer - You bear the risk of rate changes, not the supplier
• Validation opportunity - Separate line items can be checked against published rates

Validation with EnergyCode: This is exactly where EnergyCode adds value. Each pass-through charge has published rates and methodologies - we calculate what you should pay and compare it to what's on your bill.