 Power plants on Maui and the Big Island automatically shut off power to prevent damage, and generators tripped on Oahu, causing overloads in the electrical grid.The Oahu power outages lasted 14 hours in some locations; only half of Hawaiian Electric Company's (HECO) Oahu customers had power restored before 9 pm, while outages generally lasted to about 5 pm on Maui and Hawaii.Power was restored to all HECO circuits by 1