“For its first mission to the International Space Station, SpaceX’s Dragon spacecraft will use deployable solar arrays as its primary power source for running sensors, driving heating and cooling systems, and communicating with SpaceX’s Mission Control Center and the Space Station. Dragon’s solar arrays generate up to 5,000 watts of power — enough to power over 80 standard light bulbs. The solar arrays, shielded by protective covers during launch, deploy just minutes after Dragon separates from the Falcon 9 second stage, as it heads towards its rendezvous with the Space Station.
While many commercial satellites and NASA missions such as the Hubble Space telescope use solar arrays, Dragon will be the first commercial American transport vehicle to do so.”
-Spacex Press Release