14.—(1) A designated electricity supplier may discharge its renewables obligation by the production to the Authority of a Northern Ireland certificate.
(2) A designated electricity supplier may discharge up to 25% of its renewables obligation in respect of an obligation period by producing to the Authority UK ROCs relating to electricity supplied in the immediately preceding obligation period.
(3) Subject to paragraph (4), no more than 4% of a designated electricity supplier's renewables obligation may be satisfied by the production of UK ROCs issued in respect of electricity generated from bioliquid.
(4) The limit set out in paragraph (3) does not apply to the production of UK ROCs issued in respect of electricity—
(a)generated by a generating station to which article 34 applies,
(b)generated by a qualifying CHP station which has, as at the date of generation of the electricity, a total installed capacity of less than 1 megawatt,
(c)generated from advanced fuel, or
(d)generated in the way described as “energy from waste with CHP” in Schedule 5.
(5) A designated electricity supplier must not produce to the Authority a UK ROC which is previously been or has previously been produced to the Northern Ireland authority under a NIRO Order.