http://www.legislation.gov.uk/id/uksi/2014/2043/schedule/1

SCHEDULE 1Settlement calculations

The Settlement Body must, in respect of the first levy period, calculate the amount of settlement costs levy (“

S L_{s}

”) to be paid by each liable electricity supplier (“S”) in accordance with the formula—

S L_{s} = P A \times \frac{D_{s}}{\sum D_{s}} .

In this paragraph—

“ $D_{s}$ ” means the net demand of S for the first levy period;
“ $\sum D_{s}$ ” means the sum of the net demand of all liable electricity suppliers for the first levy period;
“the first levy period” has the same meaning as in regulation 44;
“liable electricity supplier” has the same meaning as in regulation 44;
“net demand” means the sum of the demand for active energy for which an electricity supplier is responsible including demand directly connected to the transmission system or a distribution network, less the output of any generation for which an electricity supplier is responsible that is connected to a distribution network, and for the purposes of this paragraph net demand cannot be less than zero; and
“PA” means the prescribed amount, as specified in regulation 44(2).