Tariff Category

Since the Common Distribution Charging Methodology (CDCM) came into effect in April 2022, all 14 DNOs use the same 32 standardised tariff categories. Your LLFC code maps to exactly one of these categories, and that determines all your DUoS rate components.

The 32 CDCM tariff categories:

Domestic (2):

• DOM_AGG - Domestic Aggregated (standard domestic)
• DOM_AGG_REL - Domestic Related MPAN (secondary meters like storage heaters)

Non-Domestic Aggregated (6):

• ND_AGG_NR - No Residual
• ND_AGG_B1 through ND_AGG_B4 - Bands 1-4
• ND_AGG_REL - Related MPAN

Site Specific (15):

• LV_SS_NR, LV_SS_B1-B4 (Low Voltage)
• LVS_SS_NR, LVS_SS_B1-B4 (LV Sub)
• HV_SS_NR, HV_SS_B1-B4 (High Voltage)

Generation (8):

• LV_GEN_AGG, LVS_GEN_AGG (Aggregated)
• LV_GEN_SS, LVS_GEN_SS, HV_GEN_SS (Site Specific)
• LV_GEN_SS_NRP, LVS_GEN_SS_NRP, HV_GEN_SS_NRP (No RP Charge)

Unmetered (1):

• UMS - Unmetered Supplies

Why this matters for validation: EnergyCode maintains a complete mapping of 4,278 LLFCs to their correct tariff categories across all 14 DNOs and 22 IDNOs. If your bill shows rates that don't match the published rates for your tariff category, we'll flag the discrepancy.