S.C. Code § 58-31-710
The Public Service Authority, through its board of directors, shall adopt and publish pricing principles that respect and balance factors including, but not limited to, adherence to the Authority's mission to be a low-cost provider, reliability, transparency, preservation of the Authority's financial integrity, equity among customer classes, gradualism in adjustments to its pricing and rate schedule type, encouragement of efficiency and demand response, adequate notice to customers, and relief mechanisms for financially distressed customers. The Authority shall also maintain and continue to offer rate schedules and options that provide demand-side management flexibility including, but not limited to, non-firm sales and interruptible power rates, and conservation opportunities to its customers.
S.C. Code § 58-31-710