S.C. Code Ann. § 6-11-920

Any bonds issued pursuant to this article may be issued with a provision for their redemption prior to their maturity at par and accrued interest, plus such redemption premium as may be prescribed by the commission, but no bond shall be redeemable before maturity unless it contains a statement to that effect. In the proceedings authorizing the issuance of the bonds, provisions shall be made specifying the manner of call and the notice thereof that must be given.