Section 15, The National Power Authority Act, 1982

(1) In addition to the powers conferred by sub-section (2) of section 14, the Authority may carry on all or any of the following particular functions— (a) the manufacture, provision, sale, letting on hire, connection, maintenance, repair, or removal of any electric lines, fittings, apparatus or appliances for lighting, heating or power or any other purposes for which energy can or may be used; (b) the maintenanse of shops and showrooms for the display, sale and hire of electrical equipment of all kinds; and (c) the advertisement of such electrical equipment whether by way of demonstration, exhibition, or otherwise. (2) All charges made by the Authority for the sale or letting on hire of electric lines, fittings, apparatus or appliances shall be fixed at such rates that the revenue derived by the Authority from such sale and such letting on hire shall not be less than the expenditure incurred in or about such sale and letting on hire including the cost of providing or manufacturing such electric lines, fittings, apparatus or appliances. (3) The Authority shall not attach to the supply of energy any condition involving the provision by, or purchase or hire from the Authority of any electric fittings, apparatus or appliances nor give preference direct or indirect to any consumer on condition of such provision by, or purchase or hire from, the Authority. (4) All electric lines, fittings, apparatus and appliances provided or let on hire by the Authority on a customer's premises shall be deemed to form part of the property of the Authority. [Margin: Duty of th[illegible] Authority supply energy.]