The provisions of this article are not severable. If any part of this article is declared invalid under the constitution or laws of this state, such declaration shall render invalid all parts which remain. Notwithstanding such invalidity, action taken by any party in conformity with the provisions of this article shall be considered lawful actions by such party; provided, however, any electric service rendered which would have been illegal or unlawful or violative of any contractual provision absent this article shall be terminated and the facilities shall be removed following any determination of the invalidity of this article.