(a) This article shall apply to electric membership corporations but shall not apply to other persons except when expressly so provided in this article.

(b) This article shall apply to commerce with foreign nations and among the several states only insofar as the same may be permitted under the Constitution and laws of the United States.

(c) This article shall not impair the existence of any electric membership corporation existing on July 1, 1981. Any such existing electric membership corporation and its members, directors, and officers shall have the same rights and be subject to the same limitations, restrictions, liabilities, and penalties as an electric membership corporation formed under this article and its members, directors, and officers.

(d) If the articles of incorporation or the bylaws of an electric membership corporation in existence on July 1, 1981, contain any provisions which were not authorized or permitted by the prior electric membership corporation law of this state but which are authorized or permitted by this article, such articles of incorporation or bylaw provisions shall be valid on and from July 1, 1981; and action may be taken on and from that date in reliance on such provisions.