Del. Code tit. 22 § 1313
A company may issue refunding bonds for the purpose of paying any of its bonds at or prior to maturity or upon acceleration or redemption. Refunding bonds may be issued at such time prior to the maturity or redemption of the refunded bonds as the company deems to be in the public interest. The refunding bonds may be issued in sufficient amounts to pay or provide the principal of the bonds being refunded, together with any redemption premium thereon, any interest accrued or to accrue to the date of payment of such bonds, the expenses of issue of the refunding bonds, the expenses of redeeming the bonds being refunded and such reserves for debt service or other capital or current expenses from the proceeds of such refunding bonds as may be required by the resolution, trust indenture or other security instruments. The issue of refunding bonds, the maturities and other details thereof, the security therefor, the rights of the holders thereof and the rights, duties and obligations of the company in respect of the same shall be governed by this chapter relating to the issue of bonds other than refunding bonds insofar as the same may be applicable.
22 Del. C. § 1313