Yes, a half power outage is a very real and documented electrical phenomenon that occurs when a residential home loses half of its incoming electrical supply from the utility company or experiences a split-phase breaker failure. North American homes operate on a 240-volt split-phase system supplied by two separate 120-volt hot legs from the utility transformer; if one of the incoming hot lines from the power pole snaps, burns out, or loses connection, exactly half of your home's circuits will go completely dead while the other half stays powered. You can troubleshoot utility power losses safely by avoiding electrical panels if components are exposed. You can verify that your corrective action is successful when contacting your electric utility provider to repair the dropped line restores full power to your entire home.
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