[Update: As of 5:50 a.m. Monday, DWP said power was fully restored to all customers]

CHATSWORTH (CBSLA.com) — More than 4,000 customers in the areas of Chatsworth and Porter Ranch lost power Sunday evening.

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A shut-down of a distribution station was the cause of the outage, according to DWP.

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The power outage occurred at 6:50 p.m., said a spokesperson for DWP.

By 8 p.m. Sunday, DWP said power was restored to nearly half of their customers with only about 1,993 still without electricity.

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DWP said they expected full restoration of service to occur between 4 and 5 a.m. Sunday.