What is Deemed Export Quantity?  

Deemed export quantity is an estimation, based on a formula, of exported electricity in kWh. 

Deemed export quantity is used as a proxy for metered export data, where metered export data is not available. 

The formula to calculate it is as follows:  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’s 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. 

 

Sample calculation for deemed export quantity: 

Example 1: Residential customer with an MEC of 1.8 and where the "Provision Interval" is 12 months (= 8,760 hours)  

ParameterValueComment
MEC (kW)  1.8As recorded by ESBN  
Capacity Factor  0.0979.7% as decided by CRU
Export Factor  0.3535% as decided by CRU
Provision interval  876012-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 8,760) 

    We receive the deemed export quantity as calculated by ESB Networks and apply our microgeneration rate to this quantity.