Ala. Code § 19-3-127

Bonds issued by the Tennessee Valley Authority under the provisions of the Tennessee Valley Authority Act of 1933, as amended or as the same may be hereafter amended, shall be legal investments for fiduciaries investing trust funds and for investments by savings banks and insurance companies organized under the laws of the state, and shall be eligible to be used as security for the deposit of funds of the state and its instrumentalities.