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Rh : performance as may be issued or approved by the Authority under section 16;
 * (b) to facilitate competition in the generation and sale of electricity by making its transmission system available to persons authorised to generate, trade or retail electricity or to provide market support services on terms which neither prevent nor restrict such competition; and
 * (c) to provide non-discriminatory access to its transmission system for the supply and use of electricity in accordance with this Act, its transmission licence and the market rules.

(3) It shall be the duty of a retail electricity licensee to develop and maintain a reliable, efficient, coordinated and economical electricity retail business in accordance with such applicable codes of practice and other standards of performance as may be issued or approved by the Authority under section 16.

(4) It shall be the duty of a market support services licensee—
 * (a) to develop and maintain a reliable, efficient, coordinated and economical system for the provision of market support services in accordance with such applicable codes of practice and other standards of performance as may be issued or approved by the Authority under section 16;
 * (b) to facilitate competition in the retailing of electricity by providing market support services to consumers and retail electricity licensees on terms which neither prevent nor restrict such competition; and
 * (c) to provide non-discriminatory access to its market support services in order to facilitate retail competition in accordance with this Act, its market support services licence and the market rules.

(5) It shall be the duty of an electricity licensee to ensure that it will not do or not omit to do any act which will adversely affect, directly or indirectly, the security and stability of the electricity supplied by it or by any other person to consumers.

Non-contestable consumers

21.—(1) A market support services licensee shall provide market support services to a non-contestable consumer in accordance with