13.—(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 per cent of its renewables obligation in respect of an obligation period by producing to the Authority renewables obligation certificates relating to electricity supplied in the immediately preceding obligation period.
(3) Subject to paragraphs (4) and (5), no more than 12.5 per cent of a designated electricity supplier’s renewables obligation may be satisfied by the production of renewables obligation certificates issued in respect of electricity generated by a generating station in a month during which it generated electricity partly from fossil fuel and partly from biomass.
(4) Paragraph (3) does not apply to the 1st April 2009 to 31st March 2010 obligation period, where no more than 10 per cent of a designated electricity supplier’s renewables obligation may be satisfied by the production of renewables obligation certificates issued in respect of electricity generated by a generating station in a month during which it generated electricity partly from fossil fuel and partly from biomass.
(5) In the case of a renewables obligation certificate issued in respect of electricity generated by a generating station in a month during which it generated electricity partly from fossil fuel and partly from biomass the limits set out in paragraph (3) or (4) do not apply to the production of those certificates if and to the extent that the electricity in respect of which they were issued was generated by—
(a)co-firing of biomass with CHP;
(b)co-firing of energy crops; or
(c)co-firing of energy crops with CHP.
(6) In determining how electricity has been generated for the purposes of paragraphs (3) to (5), no account is to be taken of any fossil fuel which the generating station uses for permitted ancillary purposes.
(7) A designated electricity supplier must not produce to the Authority a renewables obligation certificate which has previously been or is produced to the Northern Ireland authority under a NIRO Order.
(8) In this article—
“co-firing of biomass with CHP”, “co-firing of energy crops”, and “co-firing of energy crops with CHP” have the same meaning as in Schedule 2.