N.C. Gen. Stat. § 117-16.1: Discrimination prohibited.

No electric membership corporation shall, as to rates or services, make or grant any unreasonable preference or advantage to any member or subject any member to any unreasonable prejudice or disadvantage. No electric membership corporation shall establish or maintain any unreasonable difference as to rates or services either as between localities or as between classes of service. No electric membership corporation shall give, pay, or receive any rebate or bonus, directly or indirectly, or mislead or deceive its members in any manner as to rates charged for the services of such electric membership corporation. (1965, c. 287, s. 11.)