First Solar, Inc. announced that it had signed a 15-year power purchase agreement (PPA) with Dow, Inc. for its Gulf Coast operations.    Dow’s Texas Operations is the largest petrochemical site in the western hemisphere. First Solar had previously disclosed the execution of the PPA without identifying the off-taker.   Under the agreement, First Solar will supply Dow with renewable energy from 75% of its 200-megawatt (MW)AC Horizon Solar project in Frio County, Texas.    The project w...