Iraq has signed a $450 million investment deal with Excelerate Energy to build the Gulf country's first floating storage regasification unit, as Baghdad seeks to attract more U.S. investment to its energy sector. The unit, capable of receiving, storing and regasifying liquefied natural gas, will be based at the port of Khor al-Zubair, with gas piped for integration into Iraq’s power grid, two Iraqi energy officials with knowledge of the agreement said.