Commercial Building Power Outage: Check People and Critical Systems First
A power outage affects more than lighting. Start with people, safe routes and critical services, then coordinate a controlled recovery with the utility and qualified electrical staff.
Last reviewed 2026-09-15 · General facility-maintenance information, not a substitute for site procedures, manufacturer instructions, codes, or qualified professional judgment.
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What to check first
Bring these
- Flashlight
- Phone or radio
- Site emergency contact sheet
- Portable phone power bank
- Battery-powered lantern
What to do
- 1Check immediate safetyFollow the site outage plan. Report trapped elevator occupants and anyone dependent on powered equipment. If exit lighting or other conditions make occupancy unsafe, coordinate evacuation through the emergency plan; do not wait for batteries to run down.
- 2Determine scope from safe observationsNote affected rooms, buildings and nearby properties. Check the utility outage information from a safe location. Do not open switchgear, test live conductors or assume an outage proves equipment is de-energized.
- 3Check critical status through normal displaysAuthorized staff should report the visible status of emergency lighting, fire protection, access control, refrigeration and standby power. An operating generator does not mean every critical circuit is supplied. Escalate impairments to the responsible lead.
- 4Control temporary arrangementsUse battery lighting instead of candles. Any portable generator requires an approved outdoor setup, safe exhaust separation and proper electrical connections; never operate one inside or in a partially enclosed area. Leave transfer equipment to qualified personnel.
- 5Restore in a planned sequenceAfter stable supply is confirmed, follow equipment restart instructions with qualified staff. Check for faults, leaks, incorrect schedules and failed restart. Document exceptions; do not leave a building open merely because the lights returned.
Leave a useful maintenance record
Record the exact location, observed condition, time, actions taken, person contacted and follow-up owner. Keep unresolved items visible. A completed checklist means the check was performed; it does not automatically mean the equipment passed or is safe.
References and further reading
Ready.gov: business continuity planning — https://www.ready.gov/business CDC: workplace carbon monoxide and generator hazards — https://www.cdc.gov/niosh/carbon-monoxide/about/index.html Use the installed equipment manual and your site plan for equipment-specific procedures.
Stop and call a licensed professional when
- Burning odor, arcing, downed lines, unsafe exit routes or failed life-safety services needs urgent escalation.
- Follow emergency services and the site plan when deciding whether occupancy can continue.