PART 2General
The supplier settlement calculations
3.—(1) The Settlement Body must make the calculations set out in Parts 3 and 5 and Schedule 1 (“the supplier settlement calculations”)—
(a)by such date as may be specified in those provisions or, where no date is specified, by such time as is necessary to enable the Settlement Body to comply with these Regulations; and
(b)so far as possible, using the required data.
(2) Where, by the time a supplier settlement calculation is to be made, the Settlement Body has not been provided with any required data which is necessary for that calculation, the calculation must be made using the best data available to the Settlement Body.
(3) In this regulation, “required data” means data which is required to be provided to the Settlement Body under these Regulations, the Principal Regulations or capacity market rules.
Forecast of net demand
4.—(1) Paragraph (2) applies to a person (“S”) who, on the 1st June before the start of a capacity year (“year X”), is an electricity supplier.
(2) S must, by no later than the 1st June before the start of year X—
(a)forecast its total net demand during periods of high demand in year X; and
(b)provide the forecast to the Settlement Body.
Invoices and credit notes etc: general
5.—(1) An invoice or credit note issued by the Settlement Body must set out the determination of the amount which the recipient is liable to pay, or is entitled to receive, in such detail as will readily show the recipient how the determination has been made.
(2) An invoice must specify the day by which it is to be paid, which must be not less than 3 working days after the date on which the invoice is issued.
(3) Where an electricity supplier has provided the Settlement Body with an address for the electronic service of invoices and credit notes, the Settlement Body must in addition send an invoice or credit note electronically to the address provided.
(4) Any invoice, credit note or other document issued or given under these Regulations must be in writing and dated.