What is Deemed Export Quantity?
Deemed Export Quantity is an estimation, based on a formula, of exported electricity in kWh: it will be used as a proxy for metered export data, where metered export data is not available.
The formula to calculate Deemed export quantity = MEC x Capacity Factor x Export Factor x Provision Interval.
Where:
• MEC is a capacity value in units of kW, representing the generation capacity of the installed generation equipment, as declared via ESBN’s NC6 (or equivalent) form
• Capacity Factor is the ratio of average electricity produced to the theoretical maximum possible if the installed capacity was generating at a maximum for a full year. CRU have proposed this value is set at 9.7% for all technology types. It is the average capacity factor of photovoltaic panels
• Export Factor is the amount of electricity (expressed as a percentage of electricity produced) deemed to be exported, where the metered data is not available. CRU have set this value at 35%
• Provision Interval is the number of hours in the period for which cumulative export quantities are to be calculated and to be made available to suppliers by ESBN
Example of a deemed calculation:
Sample calculation for Deemed Export Quantity
Example 1: Residential customer with an MEC of 1.8 and where the "Provision Interval" is 12 months (= 8760 hours)
ParameterParameter | ValueValue | CommentComment |
ParameterMEC (kW) | Value1.8 | CommentAs recorded by ESBN |
ParameterCapacity Factor | Value0.097 | Comment9.7% as decided by CRU |
ParameterExport Factor | Value0.35 | Comment35% as decided by CRU |
ParameterProvision interval | Value8760 | Comment12-month interval |
- Deemed Export Quantity = MEC x Capacity Factor x Export Factor x Provision Interval
- Deemed Export Quantity = 535.30kWh (=1.8 X 0.097 x 0.35 x 8760)
We receive the deemed export quantity as calculated by ESB Networks, and apply our microgeneration rate to this quantity.