Cascading failure analysis of green hydrogen production in response to adverse events, i.e., component failures and degradation, was the focus of this master’s thesis. Safety and reliability are critical as the world transitions to hydrogen as a clean, sustainable energy carrier. The failure of one component in production plants increases the risk of system failure. This study aims to identify potential failure modes and causes of the domino effect in components, identify areas of limitations and gaps where these can have catastrophic consequences, and provide mitigation strategies on how to deal with them. Failure mode and effect analysis (FMEA) and event tree analysis (ETA) were used to identify potential failure modes in the PEM electrolyzer system, as well as the interdependence of its components.