Spokesman Scott Surgeoner said the outage occurred at about 4:40 p.m. Monday and affected several substations in Monmouth County.
At 6:30 p.m., Surgeoner said the utility had isolated the problem and was beginning to restore power to those who lost it. He said JCP&L had the electricity back on for all customers by about 10:30 p.m.
Surgeoner said he did not know exactly where the equipment breakdown occurred.
Dozens of communities in Monmouth County were affected.
