Honolulu ? Almost all of Oahu had electrical power restored Saturday after a power failure blacked out the island’s population of about 900,000 and thousands of visitors including President-elect Barack Obama.

Residents had been urged to just stay home after the lights went out during a thunderstorm Friday evening. Hawaiian Electric Co. was investigating the cause.

The utility had restored power to 276,000, or 94 percent, of its 293,000 customers as of Saturday afternoon., said company spokesman Darren Pai.

Obama, wife Michelle, and daughters Malia and Sasha are staying in a $9 million, five-bedroom oceanfront home near downtown Honolulu.