Why Charging Statements Get Revised Mid-Year
Tariff StructureDNOs publish revised versions (v1.1, v1.2) during a charging year to add new LLFC codes - tariff rates stay the same.
DNOs publish their charging statements before each charging year (1 April to 31 March). However, you'll often see revised versions appear during the year - v1.0 becomes v1.1, then v1.2.
What changes in revisions:
- New LLFC codes added (Annex 3)
- New IDNO embedded network mappings
- Corrections to typos or formatting
What never changes:
- Tariff rates (Annex 1)
- Tariff category definitions
- Charge component structures
Why this happens:
- New smart meter configurations are deployed
- IDNOs register new embedded networks
- Aggregated billing arrangements are modified
- Minor corrections needed
For bill validation: Always use the latest version of the charging statement for the relevant charging year. If you're validating a bill from October 2025 and v1.2 was published in August 2025, use v1.2.
EnergyCode automatically tracks charging statement versions and uses the latest available data for each DNO region.
Related terms
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