Power Up: Roll Out Solar Arrays Boost Space Station Power Supply

What this means

NASA’s October 15 update describes an expansion of the International Space Station’s solar-power system. Six roll-out arrays were installed from 2021 through 2023, and another pair traveled to the station on the 35th SpaceX commercial resupply mission. NASA expects the eight arrays together to add more than 160 kilowatts for station research and operations; the release does not give an installation date for the latest pair.

Official release

Source material from NASA. The wording below is the issuer’s statement.

From the International Space Station’s unique position 250 miles above Earth, the Sun is a vital source of energy. Solar power supports the station’s life support systems, daily activities, and hundreds of research investigations that improve life on Earth and prepare humans for deep space exploration. Over the past five years, NASA augmented the station’s power generation and distribution capability with next-generation International Space Station Roll Out Solar Arrays (IROSAs).

An International Space Station Roll Out Solar Array deploys in 2022.

NASA

In 2017, a technology demonstration conducted aboard the space station tested the effectiveness of the arrays. The lightweight, compact design launches as a cylinder and unfurls like a yoga mat after installation. This advanced design reduces mass and volume at launch and uses an autonomous, self-deploying system that minimizes risks during rollout.

Sunlight flares across the International Space Station’s solar arrays.

NASA

The technology is also scalable to meet mission requirements. The IROSAs are about half the size of the station’s legacy arrays. Despite being smaller, the arrays are capable of producing about 28 kilowatts of additional power.

The first two International Space Station Roll Out Solar Arrays loaded in a SpaceX Dragon’s trunk before delivery to the orbiting laboratory during the company’s 22nd commercial resupply services mission for NASA in 2021.

SpaceX

Six IROSAs were installed outside of the space station between 2021 and 2023. In 2023, power projections prompted a request for another set of IROSAs, which launched in Dragon spacecraft’s trunk during the SpaceX 35th commercial resupply services mission to space station for NASA. Together, the eight IROSAs will increase power by more than 160kW for research and operations.

NASA astronauts perform a spacewalk to install an International Space Station Roll Out Solar Array with the assistance of the Canadarm2 robotic arm in 2022.

NASA

With the full upgrade in place, the space station’s revitalized power system not only supports NASA’s legacy in low Earth orbit but also helps advance technology that will extend the agency’s reach into the solar system. From planetary defense demonstrations, like the Double Asteroid Redirection Test, to future human exploration efforts, the space station is an essential testbed for the technologies needed for expeditions beyond Earth’s orbit.

Release text attributed to NASA. Consult the official publication for any subsequent corrections or updates.