A Disneyland spokesperson said power is down in Toontown and Fantasyland, and crews are working to restore it.
They added that guests are being escorted off rides.
A park spokesperson issued a statement, saying the outage stems from Disneyland's transformer.
"We've determined that the issue is with a Disneyland Resort transformer and our team is currently assessing and working to restore power," the statement read.
Officials did not provide details on estimated restoration time.
Disneyland was near capacity Wednesday, in the middle the holiday season.
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