NASA restores contact with ISS after temporary outage at Houston mission control

On July 25th, NASA's mission control in Houston lost power and communication with the ISS for around 90 minutes.
The crew was not endangered as backup communication was quickly established through Russian systems.
The outage occurred during planned power upgrades and affected only one floor of the building.
NASA activated backup hardware at the Johnson Space Center for the first time.
Normal operations have since resumed between mission control and the ISS.