MANILA--Typhoon Rammasun left much of Manila and nearly a dozen provinces without electricity on Wednesday as it swept across the Philippines.

The deadly storm was expected to intensify as it moves out to the South China Sea on its way toward southern China.

The Philippine Red Cross said at least nine people were killed throughout the country. Officials later increased that figure to more than 20, the Associated Press reported.

In Quezon province, three family members were killed when a concrete wall collapsed as the typhoon passed over the province's capital of Lucena City. Two men were killed elsewhere in Quezon, which is southeast of Manila.

Joe Zaldarriaga, spokesman for Manila Electric Co., told The Wall Street Journal that about 86% of the company's more than 5.3 million customers in Metro Manila and nearby provinces--an area that is home to about 25 million people--were without power by noon on Wednesday.

"We're gradually restoring service, but our main problem is the southern portion of our franchise area," said Mr. Zaldarriaga. He added that transmission lines of the National Grid Corp. of the Philippines, which transports electricity from major power plants located south of the capital, remained out of operation.

Energy Secretary Jericho Petilla said about 40% of the area powered by Manila Electric would likely remain without power through at least Wednesday night.

"So far there are no reports of power-plant damage, which is the good news," Mr. Petilla said.

Authorities urged hospitals in Manila and other affected areas to stock up on fuel for generators to ensure they could make it through the next 24 hours. The government said 11 roads and one bridge were impassable due to damage or flooding caused by the storm in the worst-hit provinces.

Dozens of domestic and international flights were canceled earlier Wednesday, but Manila's international airport resumed flights later in the day. Two Boeing Co. jets owned by Singapore Airlines and Malaysia Airlines were damaged by strong winds as they were parked at the airport.

Along the eastern coastline in Albay province, where the typhoon made landfall Tuesday evening, strong winds ripped roofs off houses and schools, uprooted trees and toppled electric poles.

Typhoon Rammasun slammed into the Philippines at dusk on Tuesday, with sustained winds at its center of 130 kilometers per hour and gusts of up to 160 kilometers. The typhoon intensified as it moved from Albay province to other provinces south of Manila, with sustained center winds of 150 kilometers per hour and gusts of 185 kilometers per hour.

Typhoon Rammasun is the strongest typhoon to make landfall since Typhoon Haiyan, which devastated central provinces in November. Philippine authorities expressed relief that Rammasun's punch was small in comparison to that of Haiyan, which claimed more than 6,000 lives.

"We've learned our lessons," said Gwen Pang, secretary-general of the Philippine Red Cross. "People I believe were sufficiently made aware of what the situation would be like," said Ms. Pang. More than 300,000 people in zones expected to be in Rammasun's path were evacuated before the typhoon made landfall.

The Philippines is visited by around 20 large storms every year.

Trefor Moss contributed this article.

Write to Cris Larano at cris.larano@wsj.com

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