31.—(1) A periodic levelisation period—
(a)must not be longer than 3 months;
(b)may begin on the first day of a FIT year; and
(c)must not end after the end of the FIT year.
(2) There may be more than one periodic levelisation period during a FIT year.
(3) Except in respect of FIT year 1, the Authority must publish on or before 1st March before the beginning of each FIT year the periodic levelisation periods which apply for that year.
(4) Subject to paragraph (5), for FIT year 1, the periodic levelisation periods are—
(a)the period beginning on 1st April 2010 and ending on 30th June 2010;
(b)the period beginning on 1st July 2010 and ending on 30th September 2010;
(c)the period beginning on 1st October 2010 and ending on 31st December 2010;
(d)the period beginning on 1st January 2011 and ending on 31st March 2011.
(5) The Authority may vary the periodic levelisation periods that apply to a FIT year but where it does so it must publish the variation at least 1 month before the variation is to take effect.