Find this article at:http://www.nasa.gov/mission_pages/station/structure/iss_assembly_4a.html
The STS-97 crew delivered and installed the P6 Truss, which contains the first U.S. solar arrays. The P6 was temporarily installed on top of the Z1 Truss. The P6 provides solar power with solar arrays and batteries, called the photovoltaic modules.
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