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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) 

Parameter 

Parameter 

Value 

Value 

Comment 

Comment 

Parameter 

MEC (kW) 

Value 

1.8 

Comment 

As recorded by ESBN 

Parameter 

Capacity Factor 

Value 

0.097 

Comment 

9.7% as decided by CRU 

Parameter 

Export Factor 

Value 

0.35 

Comment 

35% as decided by CRU 

Parameter 

Provision interval 

Value 

8760 

Comment 

12-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.