58.—(1) ROCs are not to be issued in respect of any electricity generated by a generating station from a gaseous fuel produced by means of gasification or pyrolysis unless—
(a)the generating station is an excepted generating station, or
(b)the gaseous fuel has a gross calorific value of at least 2 megajoules per metre cubed at 25 degrees Celsius and 0.1 megapascals when measured at the inlet to the generating station.
(2) In this article, “excepted generating station” means a generating station—
(a)which was accredited on or before 31st March 2011,
(b)which since being accredited, has not ceased to be accredited at any time, and
(c)in respect of which, if it was not accredited as at 31st March 2009, preliminary accreditation was held on and from that date until the date on which it was accredited.