12.—(1) The requirements referred to in regulation 4(b) are—
(a)installation of the plant was completed and the plant was first commissioned on or after 15th July 2009;
(b)the plant was new at the time of installation;
(c)the plant uses liquid or steam as a medium for delivering heat to the space, water or process;
(d)heat generated by the plant is used for an eligible purpose.
(2) The requirements of paragraph (1)(a) and (b) are deemed to be satisfied where the plant was previously generating electricity only, using solid biomass or biogas, and was first commissioned as a CHP system on or after 15th July 2009.
(3) But the requirements of paragraph (1)(a) and (b) are not satisfied where the plant was previously generating heat only and was first commissioned as a CHP system on or after 15th July 2009.