Glossary Term
Blackout Test
A blackout test is a controlled test of the yacht’s electrical generation and recovery logic after a simulated total loss of main electrical power. On a superyacht, the purpose is to verify that the vessel can recover essential functions safely and in the intended sequence after a full blackout condition. The term belongs to commissioning, trials, periodic testing, and post-refit verification.
DNV states that a proper blackout test involves both the main power system and the emergency generator start-up, because blackout recovery depends on those parallel processes working correctly without operational delay. On a yacht, that sequence may include automatic start of standby generation, recovery of essential switchboard sections, emergency lighting, alarms, automation, steering support, and orderly return of selected services once the system is stable.
A useful blackout test is planned around the yacht’s actual power architecture rather than a generic checklist. The team needs to know what trips first, what restarts automatically, what must stay locked out, what load-shedding logic should do, and which hotel or mission systems are intentionally delayed. On heavily integrated yachts, the test usually sits alongside wider electrical and electronic verification and recorded setting checks.
The outcome is more than a pass or fail. A good test confirms recovery time, reveals weak logic paths, shows whether crews understand the sequence, and exposes hidden dependencies between automation, propulsion support systems, pumps, and switchboards. Those findings are far easier to correct before handover than after a real loss of power underway.