28.—(1) In this Part—
(a)a “periodic levelisation payment” is a payment—
(i)made to a licensee out of the levelisation fund; or
(ii)made by a licensee into the levelisation fund,
on account of the licensee’s annual levelisation payment for a FIT year.
(b)a “periodic levelisation period” is a period determined and published by the Authority in accordance with this article.
(2) The Authority must, not later than 1st March before the beginning of each FIT year, determine and publish the periodic levelisation periods which are to apply in that FIT year.
(3) Each periodic levelisation period must be a period of three months or less falling wholly within the relevant FIT year.
(4) The Authority may vary the periodic levelisation periods that apply in a FIT year, but if it does so it must publish the variation at least one month before the variation is to take effect.
(5) In each periodic levelisation period, the Authority must calculate the periodic levelisation payment which each licensee is required to make, or is entitled to receive.
(6) A calculation under paragraph (5) must be based on the Authority’s estimate of the difference between the licensee’s FIT contribution and its market share FIT contribution for the FIT year in which the periodic levelisation period falls.