EDCM
EHV Distribution Charging Methodology
Tariff StructureSite-specific pricing methodology for Extra High Voltage (22kV+) connections - unlike CDCM's 32 standard tariffs, each EHV site gets individually calculated charges based on network modelling.
EDCM is the charging methodology used for large electricity connections at Extra High Voltage (22kV and above). Unlike CDCM which uses standardised tariff categories, EDCM calculates bespoke charges for each site based on detailed network modelling.
Key differences from CDCM:
| Aspect | CDCM | EDCM |
|---|---|---|
| Voltage | LV, LV Sub, HV | EHV (22kV+) |
| Tariffs | 32 standard categories | Site-specific |
| Published in | Annexe 1 | Annexe 2 |
| Calculation | LLFC lookup | DNO network model |
| Time bands | Red/Amber/Green | Super Red + other |
Two EDCM variants:
- FCP (Forward Cost Pricing) - DCUSA Schedule 17, based on projected network load growth
- LRIC (Long Run Incremental Cost) - DCUSA Schedule 18, based on nodal incremental costs
What EDCM charges include:
- Import and export capacity charges
- Exceeded capacity penalties
- Super Red unit charges (Nov-Feb, Mon-Fri 4pm-7pm)
- Fixed charges
- Reactive power charges
Why EDCM sites exist: These are typically large industrial sites, data centres, or sites with their own primary substations that connect directly to the 22kV, 33kV, 66kV, or 132kV network. The site-specific approach reflects that their network impact varies significantly based on location.
Important: EnergyCode provides EDCM tariff data for reference and validation purposes, but cannot calculate EDCM charges as this requires DNO network models we do not have access to.
Related terms
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