19.— (1) Schedule 1 (as amended by section 10 of the Act 2006) to the Act of 1999 is amended:

(a) by substituting for paragraph 16 the following:

“16.— For the purposes of meeting expenses properly incurred by the Commission in the discharge of its functions under this Act, the Commission may make an order (in this Act referred to as a ‘levy order’) imposing a levy to be paid each year on such class or classes of—

(a) energy undertakings,

(b) petroleum undertakings, or

(c) holders of LPG safety licences,

as may be specified by the Commission in the order and separate orders may be made under this paragraph in respect of electricity undertakings, natural gas undertakings, holders of LPG safety licences and petroleum undertakings and in respect of different classes of such undertakings.”,

and

(b) in paragraph 25, by substituting for subparagraph (aa) (inserted by section 4 of the Act of 2010) the following:

“(aa) ensure, as far as is reasonably practicable, that such accounts identify separately in regard to the gas, LPG, electricity and petroleum sectors all elements of cost and revenue, with the basis of their calculation and the detailed attribution methods used, related to the discharge of the Commission’s functions under this Act.”.