An insurer may invest in the bonds, notes, certificates of indebtedness, warrants, or other evidences of indebtedness which are valid obligations issued, assumed, or guaranteed by the United States or any state thereof or by any county, municipal corporation, district, political subdivision, civil division, or public instrumentality of any such government or unit thereof, or in any province of Canada, if by statute or other legal requirements such obligations are payable as to both principal and interest from revenues or earnings from the whole or any part of any utility supplying water, gas, a sewage disposal facility, electricity, or any other public service, including but not limited to a toll road or toll bridge.
Fla. Stat. § 625.312