9.—(1) Before the start of each obligation period, the Secretary of State is to estimate, in megawatt hours, the total amount of electricity likely to be supplied to customers in Northern Ireland during that period by electricity suppliers on whom an obligation has been imposed by an order made under Articles 52 to 55F of the Energy (Northern Ireland) Order 2003.
(2) The figure representing the number of megawatt hours so estimated for an obligation period is to be multiplied by 0.063.