The first two IROSA blankets were installed

[shoponhossaiassn]

Subsequent wings were added in 2006, 2007 and 2009. All of them have suffered degradation from years in the space environment and they do not generate as much power as they did when they were new.

The IROSA blankets, about half the size of the original arrays, are more efficient and will eventually generate an additional 120 kilowatts of power. They were designed to be mounted on brackets at the base of an existing wing, extending outward at a 10-degree angle to minimize the shade they cast on the array below.

NASA is in the process of upgrading the International Space Station's solar power system. The first two of six roll-out solar array blankets were installed last year, attached to the outboard original-equipment arrays telegram database on the far right. Two roll-out arrays launched aboard the Cargo Dragon Saturday will be attached to inboard arrays on the right- and left-side of the station.
NASA
on the left-side outboard arrays -- the oldest set on the station -- during spacewalks in 2021. The IROSAs carried up aboard the SpaceX Cargo Dragon Saturday will be installed on the left and right-side inboard wings during spacewalks in December.

"The first two arrays have been performing outstandingly well," Matt Mickle, development projects senior manager at Boeing, said in a NASA release. "The solar cells are immensely more powerful than previous generations."

Once all six roll-out arrays are installed, overall power generation will be boosted 20 to 30 percent, roughly matching the output of the original arrays when they were new.

The final two of the six IROSAs currently under contract will be launched next year. It's not yet known whether NASA will buy two final IROSAs to augment all eight of the station's original blankets.