This paper explores the current activities of the U.S. Photovoltaic (PV) Program to advance the technological development and commercialization of PV technologies. The U.S. PV Program assists industry to develop photovoltaic technology that will both provide competitive electricity generation and become an important contributor to the national and global energy mix. Under the Program＇s leadership, great strides have been made in PV technology in recent years-in materials, manufacturing processes and products. Important technological and economic challenges remain, however, and the PV Program is addressing these through a multifaceted technology development strategy, comprised of strategic research and development, technology development, and systems engineering and applications.