S.C. Code Ann. § 33-49-410: Membership.

No person who is not an incorporator shall become a member of a cooperative unless such person shall agree to use electric energy furnished by the cooperative when such electric energy shall be available through its facilities. The bylaws of a cooperative may provide that any person, including an incorporator, shall cease to be a member thereof if he shall fail or refuse to use electric energy made available by the cooperative or if electric energy shall not be made available to such person by the cooperative within a specified time after such person shall have become a member thereof. Membership in the cooperative shall not be transferable, except as provided in the bylaws. The bylaws may prescribe additional qualifications and limitations in respect of membership.