Ocean Thermal Energy Tax and Energy Credits Act of 2009 - Amends the Internal Revenue Code to: (1) allow a tax credit for producing electricity from ocean thermal energy; (2) specify that such tax credit is available to taxpayers in certain possessions and other areas under U.S. control; and (3) allow an energy tax credit for investment in equipment which uses ocean thermal energy to generate electricity, to cool (or provide cold water for use in) a structure, or to produce fresh water.