“(1) In this Part, unless the context otherwise requires,—
“co-generation process means a process for the combined production of electricity and useful thermal energy
“commencement capacity means, in relation to an existing plant, the rated generating capacity of the plant immediately before the commencement of this Part (determined according to its nameplate or nameplates)
“distribution network means the electricity lines, and associated equipment, owned or operated by an electricity distributor, but does not include—
“exemption means an exemption granted under this Part
“fossil fuel means any of the following:
“greenhouse gas has the same meaning as in section 4 of the Climate Change Response Act 2002
“nameplate has the same meaning as in section 3 of the Electricity Industry Reform Act 1998
“natural gas means—
“(b) liquid hydrocarbons, other than condensate, extracted from wet gas and sold as natural gas liquids, for example, liquid petroleum gas; and
“operate does not include the provision only of maintenance and related services
“petroleum has the same meaning as in section 2(1) of the Crown Minerals Act 1991
“specified generation plant—
“start-up time means, in relation to a plant, the time that is necessary for the plant to be generating electricity at its rated generating capacity (determined according to its nameplate or nameplates) from a cold start where the generator or generators constituting the plant start generating electricity after having previously been completely shut down and not generating.
“(2) For the purposes of the definition of specified generation plant and section 62G(1)(d), if a fossil fuel is blended with another substance that is not a fossil fuel, the fuel energy input of that blend must be calculated only from the proportion that is fossil fuel.
“(3) For the purposes of this Part, average load factor must be calculated by reference to the ratio of energy generated during the 12-month period before the relevant date in respect of which it is being calculated (or any other period that is prescribed for the purposes of any provision of this Part) to the notional quantity of energy that could be generated if the plant were operated continuously during that period at its rated generating capacity (determined according to its nameplate or nameplates).
“(4) If an existing plant having, at the commencement of this Part, the characteristics described in paragraph (a) of the definition of specified generation plant in subsection (1) is modified after that commencement to increase its rated generating capacity by more than 10% from its commencement capacity (determined according to its nameplate or nameplates), the plant must be treated as a specified generation plant during any period in which it is generating electricity at a level greater than its commencement capacity plus 10% unless paragraph (b)(ii) or (iii) of that definition applies to the plant.