The use of the facilities of the Public Service Authority and the operation of its business shall be subject to the rules and regulations from time to time adopted by the Public Service Authority; provided, however, that the Public Service Authority shall not be authorized to do anything which will impair the security of the holders of the notes, bonds or other evidences of indebtedness of the Public Service Authority or violate any agreement with them or for their benefit.
S.C. Code § 58-31-70