Power is out at The Terraces Shopping Center in Rancho Palos Verdes, affecting some 43 retailers and movie theaters.
The outage occurred around 11 a.m. and power isn't expected to be fully restored until 7 p.m., according to the Southern California Edison website.
The cause was listed only as "equipment problems" and the website stated that crews were "in the process of completing repairs."
Some stores, like Trader Joe's, are relying on their own generators to get power up and running again.
"We don't want to lose our product," said Mario Tabaldo, one of the store managers.
Other shops in the three-tiered outdoor mall at 28901 S. Western Ave. include Marshalls, El Pollo Loco and Centinela Feed & Pet Supplies.
Films currently being shown at the seven-screen theater include "The Hobbit" and "Rise of the Guardians."
- Donna Littlejohn