15.—(1) For the purposes of regulation 14(2)(b), where the plant (“plant A”) is a biomass plant, meters must be positioned in accordance with paragraph (2), (3) or (4).
(2) Meters are positioned in accordance with this paragraph if one or more eligible heat meters are installed to record the heat output delivered by a liquid from plant A.
(3) Meters are positioned in accordance with this paragraph if one or more eligible heat meters are installed to record separately—
(a)the combined heat output of plant A and any other plant (“plant B”); and
(b)the heat output of plant B.
(4) Meters are positioned in accordance with this paragraph if one or more eligible meters are installed to record separately—
(a)the combined heat output of plant A and plant B; and
(b)any energy consumption by plant B.