When a power outage is the landlord’s responsibility
It depends on why the power is out. If the outage comes from the building's wiring, a failed electrical panel, or a repair the landlord neglected, it is generally the landlord's responsibility to fix quickly. A total loss of power is an urgent habitability problem.
If the power is off because the utility account is in your name and the bill went unpaid, that part is usually yours to resolve with the utility company. But if the landlord controls the account, cut off the power, or let it be shut off to force you out, that may be illegal under California law.
Start by checking whether the outage affects only your unit or the whole building, and whether a tripped main breaker can be safely reset. Then report the problem to your landlord in writing and keep a copy.
No power means no lights, refrigeration, or heat for many homes, so it should be treated as an emergency. If your landlord will not restore power, a free, confidential review can explain your rights.
This is general information about California tenant rights, not legal advice. Every situation is different.