Section 15-1-706 - Refunding bonds; general procedure; limitations(a) Any municipality or county may refund at any time any bonds issued under this article and outstanding, including without limitation short-term bonds issued in anticipation of the issuance of long-term bonds, by issuing refunding bonds in an amount sufficient to refund the principal together with any unpaid interest and any necessary premiums and commissions. An issue of refunding bonds may be combined with an issue of additional revenue bonds on any project if consistent with the requirements of W.S. 15-1-705. Any refunding may be effected whether the bonds to be refunded have matured or shall thereafter mature, either by sale of the refunding bonds and the application of the proceeds in payment of the bonds to be refunded, or by exchange of the refunding bonds for the bonds to be refunded. The holders of any bonds to be refunded are not compelled without their consent to surrender their bonds for payment or exchange prior to the date on which they are by their terms subject to redemption by option or otherwise. Any refunding bonds are subject to the provisions of W.S. 15-1-703 and may be secured as provided in W.S. 15-1-704. The principal proceeds from the sale of any refunding bonds shall be applied only as follows: (i) To the immediate payment and retirement of the bonds being refunded; or (ii) To the extent not required for the immediate payment of the bonds being refunded then the proceeds shall be deposited in trust to provide for the payment and retirement of the bonds being refunded and to pay any expenses incurred in connection with refunding but provision may be made for the pledging and disposition of any surplus, including, without limitation, provision for the pledging of any surplus to the payment of the principal of and interest on any issue or series of refunding bonds. Money in any trust fund may be invested in direct obligations of or obligations the principal of and interest on which are guaranteed by the United States government or obligations of any agency or instrumentality of the United States government. Nothing in this paragraph shall be construed as a limitation on the duration of any deposit in trust for the retirement of bonds being refunded but which shall not have matured and which shall not be presently redeemable or if presently redeemable, shall not have been called for redemption.