Each SPSS would have been massive, measuring 6.5 miles (10.5 kilometers [km]) long and 3.3 miles (5.3 km) wide, or 21 square miles (55.7 square kilometers) in area. The surface of each satellite would have been covered with 400 million solar cells.

The transmitting antenna on the satellite(s) would have been about \ufffd mile in diameter (1 km) and the receiving antennae on the earth's surface would have been about 6 miles (10 km) in diameter. Massive structures such as this would have been a significant engineering challenge.

Because of their size, the satellites would have been constructed in space. The plan envisioned sending small segments of the satellites into space using the Space Shuttle. The materials would have been stored at work stations in low earth orbit, and then towed to the assembly point by a purpose-built "space tug" (such as operating the space shuttle).

Cost was the major obstacle to development of the SPSS. When the NASA-DOE report was completed in 1979, the estimated cost for building a prototype was $74 billion. Construction of an SPSS system would have taken about 30 years to complete. At the time, the United States did not appropriate funds to begin construction. Other countries, such as Japan, are currently exploring the concept of solar power stations in space.