Florida ? Shuttle Discovery and its crew of seven returned to Earth on Saturday and successfully wrapped up a construction mission that left the international space station with all its solar wings and extra electrical power.

Discovery swooped through a cloudy sky and landed at NASA’s spaceport in midafternoon, a little later than initially planned.

Mission Control delayed Discovery’s homecoming by about 90 minutes, or one orbit, because of windy, cloudy weather. But the wind shifted and conditions improved enough for the second and final landing opportunity of the day.

Discovery’s 13-day flight — which ended just as a new Russian-launched crew was settling into the space station — was highlighted by the installation and unfurling of the space station’s last pair of solar wings. The $300 million addition brought the orbiting outpost up to full power, a vital part of NASA’s plan to double the space station population and boost the amount of science research in a few months.

“This is really an amazing time,” said NASA’s space operations chief, Bill Gerstenmaier.