Circumstances relating to generating stations accredited, and generating capacity added, on or before 31st March 2017
4. The circumstances set out in this Article are where the electricity is—
(a)generated by a generating station which was accredited on or before 31st March 2017, and
(b)generated using—
(i)the original capacity of the station, or
(ii)any generating capacity which in the Authority’s view first formed part of the station from a date no later than 31st March 2017.