4.—(1) For the purposes of this Order, fossil derived bioliquid is to be treated as being in part composed of (or in part derived from) fossil fuel.
(2) Where fossil derived bioliquid (not being waste) is used, whether on its own or not, to fuel a generating station, the proportion of the fossil derived bioliquid which is to be treated as being composed of (or derived from) fossil fuel—
(a)is to be determined by the Authority, and
(b)is the energy content of the fossil fuel from which the fossil derived bioliquid is directly or indirectly produced expressed as a percentage of the energy content of the fossil derived bioliquid as a whole.