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(a)     that an electricity supplier may (in whole or in part) discharge its renewables obligation by making a payment to the Authority before the last discharge day, and

(b)     that an electricity supplier's renewables obligation that was not discharged in whole or in part before the last discharge day is to be treated as having been discharged to the extent specified in the order where the payment for which the order provides is made to the Authority before the end of the late payment period.

(a)     as to the sum which for the purposes of subsection (1) is to correspond to a renewables obligation certificate,

(b)     for the sums that must be paid in order for an obligation to be treated as having been discharged to increase at a rate specified in the order for each day after the last discharge day;

(c)     for different sums or rates falling within paragraph (a) or (b) in relation to different periods;

(d)     for different such sums or rates in relation to electricity generated in different cases or circumstances specified