Haw. Rev. Stat. § 163D-12: Revenue bonds; investment of proceeds, and redemption.

Subject to any agreement with the holders of its revenue bonds, the corporation may:

(1) Invest its moneys not required for immediate use, including proceeds from the sale of revenue bonds, in any investment in accordance with procedures prescribed in a trust indenture; and

(2) Purchase its revenue bonds out of any fund or money of the corporation available therefor, and hold, cancel, or resell the revenue bonds.