2.5.5 When calculating the Event Proportion (EP) the Event Delivery Proportions are also given a grace factor, called the Reconciliation Grace Factor (RGF). Thus the Constraint Event Delivery Proportion is:
$$ \begin{array}{r l}{1)\mathrm{~i f~}1}&{\leq E D P_{s,e}+R G F<1+\;R G F,E P_{s,e}=1}\end{array} $$
2) otherwise $ EP_{s,e} = EDP_{s,e} $
2.7 Monthly Availability Payments
2.7.1 The monthly Availability Payment for a Dispatch Group for a given month is calculated as follows:
$$ AP_{s,m}=\left(\sum_{w\in M}\quad AP_{s,w}\right).MDP_{s,m} $$
That is, the total Availability Payments due for the Dispatch Group for the month multiplied by the Constraint Event Delivery Proportion.
3 RESTORE SERVICES
3.1 Utilisation Payment
3.1.1 For a Dispatch Group (s), Utilisation Payments for Restore Services are calculated per Event (e). Each Event has a start time ( $ ST_{e} $) and a finish time ( $ FT_{e} $), such that $ ST_{e} < FT_{e} $.
3.1.2 The Utilisation Payment for a Dispatch Group (s) per constraint Utilisation event (e) is calculated as follows:
Where:
$$ U_{s,e}=\sum_{j=ST_{e}}^{FT_{e}}CC_{s}.UC_{s}.SP_{u}.PP(CC_{s},AD_{s,j}) $$
$ U_{s,e} $ is the Utilisation Payment for a Dispatch Group (s) during each Event (e)
sum of the Utilisation Settlement Periods during the Event
Contracted Capacity,
UC_{s} Utilisation Cost, SP_{u} Utilisation Settlement Period of the Dispatch Group, as defined above. PP is the Payment Proportion and works out what fraction of the full price is due to the Dispatch Group for every Utilisation Settlement Period based on delivery performance. AD_{s,j} is the actual, metered MW delivery of the Dispatch Group (s) for each Utilisation Settlement Period during the constraint Utilisation event j. In the payment calculations, there is no difference between Generator Sites and Demand reduction Sites, since this value is the 'reported to grid' value.
3.2 Utilisation Payment Proportion
3.2.1 Delivery of the Contracted Capacity for a Dispatch Group of equal to or greater than the Delivery Target Threshold (DTT) is awarded the Utilisation Payment "at rate" (i.e. the payment % will equate to the delivery %), up to a maximum Payable Over-delivery (PO) % of the Contracted Capacity. A
SSEN Flexibility Services