Clean Renewable Energy Bonds

Clean Renewable Energy Bonds (CREB) – Allows government entities to issue 0% interest bonds to taxable entities (corporations). After obtaining approval from IRS, the bond issuer repays only the principal back to the bondholder. The bondholder receivers the ITC instead of interest on the bond.

CREB explained
http://www.crebs.org/

Federal notice and application
http://www.irs.gov/pub/irs-drop/n-09-33.pdf