(CNN) Puerto Rico's energy grid took such a severe blow from deadly Hurricane Maria that restoring power to everyone may take months, Gov. Ricardo Rosselló told CNN on Wednesday night.

The entire system is down, the governor said. No one on the island has power from utilities.

Puerto Rico, which has been through a long recession and is deeply in debt, has a power grid that is "a little bit old, mishandled and weak," Rosselló told "Anderson Cooper 360˚."

"It depends on the damage to the infrastruacture," he said. "I'm afraid it's probably going to be severe. If it is ... we're looking at months as opposed to weeks or days."

The impact of the storm on the island territory won't be realized until officials can do a flyover and see what remains.

Rosselló said officials think some power stations are not badly damaged, but the distribution system is ruined. If transmission lines are in better shape than thought, power outages might be fixed sooner, the governor said.

Rosselló told CNN that at least one person died in the storm when a board was ripped from the house it had been nailed to by the wind and hit a man. The governor said the number of casualties in some areas is unknown because it is hard to communicate.

"We still don't have a lot of information," he said. "We're virtually disconnected in terms of communications with the southeast part of the island."

The storm -- which restrengthened into a Category 3 hurricane early Thursday -- has ravaged the Caribbean over the past few days, wreaking devastation on Dominica and the Virgin Islands before slamming into Puerto Rico.

And the threat is not yet over. A hurricane warning is in effect for the Turks and Caicos, the southeastern Bahamas and parts of the Dominican Republic.

Dominica: 15 dead; looting and food, water shortages

The island of Dominica took the full force of Maria before the storm passed on to the US territory. At least 15 people died there.

Government spokesman Charles Jong said that Maria was the "most horrifying experience" he has faced, despite seeing out many other hurricanes. He said he is out of power, food and water, and that people in Dominica have "gone into survival mode." He added that there is widespread looting on the island.

The devastation on Dominica is immense , a CNN crew flying over the island reported. Hundreds of homes have been visibly flattened or damaged. Many had roofs torn off.

The landscape has been stripped bare. Thousands of trees have been snapped at their base and those still standing are devoid of leaves. Dominica was a lush green landscape, including rainforests, but now is brown and lifeless.

Storm has moved toward the Dominican Republic

Now that Maria has moved past Puerto Rico, a US territory with 3.3 million people, search and rescue teams are taking to the country's darkened streets.

The devastating winds had died down to a whisper late Wednesday and the flooding rains were just a drizzle, but getting around was difficult due to widespread damage and no electricity except from generators.

The storm caused widespread flooding and ripped trees out of the ground. More than 10,000 remained in shelters Wednesday night.

"This is total devastation," said Carlos Mercader, a spokesman for Puerto Rico's governor. "Puerto Rico, in terms of the infrastructure, will not be the same. ... This is something of historic proportions."

Photos: Hurricane Maria slams the Caribbean An apartment building is missing a wall in San Juan, Puerto Rico, on Monday, September 25, nearly a week after Hurricane Maria devastated the US commonwealth. Power is still out in most places, and communications remain almost nonexistent on the island of 3.4 million people. Hide Caption 1 of 36 Photos: Hurricane Maria slams the Caribbean Yancy Leon rests at the Luis Muñoz Marin International Airport near San Juan on September 25. She's been waiting in line for two days to get a flight out. Hide Caption 2 of 36 Photos: Hurricane Maria slams the Caribbean An aerial view shows the flooding in San Juan on September 25. Hide Caption 3 of 36 Photos: Hurricane Maria slams the Caribbean People collect water from a natural spring created by landslides in Corozal, Puerto Rico, on Sunday, September 24. Puerto Rican Gov. Ricardo Rosselló said the island faces a humanitarian crisis. Hide Caption 4 of 36 Photos: Hurricane Maria slams the Caribbean An aerial view shows a flooded neighborhood in Catano, Puerto Rico, on Friday, September 22. Hide Caption 5 of 36 Photos: Hurricane Maria slams the Caribbean A man cleans a muddy street in Toa Baja, Puerto Rico, on September 22. Hide Caption 6 of 36 Photos: Hurricane Maria slams the Caribbean A man walks on a highway divider while carrying his bicycle through San Juan, Puerto Rico, on Thursday, September 21. Hide Caption 7 of 36 Photos: Hurricane Maria slams the Caribbean A shack is destroyed in San Juan on September 21. Hide Caption 8 of 36 Photos: Hurricane Maria slams the Caribbean A gas station's sign is damaged in Punta Cana, Dominican Republic, as the hurricane passed just north of the country on September 21. Hide Caption 9 of 36 Photos: Hurricane Maria slams the Caribbean Rescue workers drive through a flooded road in Humacao, Puerto Rico, on Wednesday, September 20. Hide Caption 10 of 36 Photos: Hurricane Maria slams the Caribbean A mattress that fell from the third floor is surrounded by debris outside a San Juan apartment complex on September 20. Hide Caption 11 of 36 Photos: Hurricane Maria slams the Caribbean Damage is seen in Roseau, Dominica, on September 20. Hide Caption 12 of 36 Photos: Hurricane Maria slams the Caribbean People walk through the destruction in Roseau on September 20. Hide Caption 13 of 36 Photos: Hurricane Maria slams the Caribbean San Juan is shrouded in darkness after the hurricane knocked out power to the entire island of Puerto Rico. Hide Caption 14 of 36 Photos: Hurricane Maria slams the Caribbean Power lines are scattered across a road in Humacao, Puerto Rico, on September 20. Hide Caption 15 of 36 Photos: Hurricane Maria slams the Caribbean Residents move aluminum panels from an intersection in Humacao on September 20. Hide Caption 16 of 36 Photos: Hurricane Maria slams the Caribbean Rescue vehicles are trapped under an awning in Humacao on September 20. Hide Caption 17 of 36 Photos: Hurricane Maria slams the Caribbean Trees are toppled outside the Roberto Clemente Coliseum in San Juan on September 20. Hide Caption 18 of 36 Photos: Hurricane Maria slams the Caribbean Members of a rescue team embrace as they wait to help in Humacao on September 20. Hide Caption 19 of 36 Photos: Hurricane Maria slams the Caribbean A tree is damaged in Fajardo, Puerto Rico, on September 20. Hide Caption 20 of 36 Photos: Hurricane Maria slams the Caribbean Debris is strewn across a Fajardo street on September 20. Hide Caption 21 of 36 Photos: Hurricane Maria slams the Caribbean A woman closes her property in Naguabo, Puerto Rico, hours before Maria's arrival. Hide Caption 22 of 36 Photos: Hurricane Maria slams the Caribbean People take shelter at Puerto Rico's Humacao Arena on Tuesday, September 19. Hide Caption 23 of 36 Photos: Hurricane Maria slams the Caribbean Two girls play on cots at the Humacao Arena. Hide Caption 24 of 36 Photos: Hurricane Maria slams the Caribbean Waves crash in San Juan as the hurricane neared Puerto Rico on September 19. Hide Caption 25 of 36 Photos: Hurricane Maria slams the Caribbean People pray in Humacao on September 19. Hide Caption 26 of 36 Photos: Hurricane Maria slams the Caribbean A street is flooded in Pointe-a-Pitre, on the French Caribbean island of Guadeloupe, on September 19. Hide Caption 27 of 36 Photos: Hurricane Maria slams the Caribbean People stand near debris at a restaurant in Le Carbet, Martinique, on September 19. Hide Caption 28 of 36 Photos: Hurricane Maria slams the Caribbean People in Luquillo, Puerto Rico, board up windows of a business on September 19. Hide Caption 29 of 36 Photos: Hurricane Maria slams the Caribbean A boat is overturned off the shore of Sainte-Anne, Guadeloupe, on September 19. Hide Caption 30 of 36 Photos: Hurricane Maria slams the Caribbean Cars line up at a gas station in San Juan on September 19. Hide Caption 31 of 36 Photos: Hurricane Maria slams the Caribbean A motorist drives on the flooded waterfront in Fort-de-France, Martinique, on September 19. Hide Caption 32 of 36 Photos: Hurricane Maria slams the Caribbean Floodwaters surround cars in Pointe-a-Pitre on September 19. Hide Caption 33 of 36 Photos: Hurricane Maria slams the Caribbean Soldiers patrol a street in Marigot, St. Martin, as preparations were made for Maria on September 19. Hide Caption 34 of 36 Photos: Hurricane Maria slams the Caribbean People buy provisions in Petit-Bourg, Guadeloupe, as the hurricane approached on Monday, September 18. Hide Caption 35 of 36 Photos: Hurricane Maria slams the Caribbean Customers wait in line for power generators at a store in San Juan on September 18. Hide Caption 36 of 36

A nightly curfew from 6 p.m. to 6 a.m. will take effect Wednesday evening and end Saturday morning, Puerto Rico Gov. announced.

Maria is next expected to pass by the Dominican Republic and the Turks and Caicos Islands, causing dangerous storm surge and rainfall. People in eastern parts of the Dominican were seeing whipping winds Wednesday night.

The once-major hurricane has already killed seven people on the Caribbean island nation of Dominica, said Gaston Browne, the Prime Minister of Antigua and Barbuda.

Browne said he had been communicating with the Prime Minister of Dominica, Roosevelt Skerrit, who reported "widespread devastation" and whose own house was shredded by the storm

Hurricane Maria obliterated homes on the island of Dominica.

JUST WATCHED Hurricane Maria slams Puerto Rico Replay More Videos ... MUST WATCH Hurricane Maria slams Puerto Rico 02:41

Puerto Rican Olympic gymnast Tommy Ramos, who rode out the storm in the northern city of Vega Baja, posted video of gusts blowing debris in front of him.

"The house is steady," Ramos told CNN. "What scares us is the flooding."

#maria #SanJuan A post shared by Sebastián Pérez (@sebastianperezphoto) on Sep 20, 2017 at 11:50am PDT

Astriv Velez, who survived the storm inside a walk-in closet, said water was coming in through the walls of her home in Trujillo Alto, just outside San Juan.

"The wind and rain has not stopped," Velez said. "There are no trees, there is no green -- only brown."

Devastation in St. Croix and St. Thomas

Maria obliterated buildings on several other Caribbean islands.

Aaliyah Bisamber of St. Croix shot video of Maria's annihilation of her old house, which was right next to her new home.

"I was pretty amazed the hurricane had such power to rip off half the house," she told CNN.

Murillo Melo recently moved to St. Croix from Brazil -- only to face one of the island's most catastrophic hurricanes.

"It was really scary. The floors were shaking, the walls, everything was moving and shaking," he said.

"Here on the island and on the mainland people are trying to get in contact with friends and relatives. ... People are desperate to get some news from their friends and relatives."

US Coast Guard Commandant Adm. Paul Zukunft said the damage to St. Croix is especially alarming.

"First priority is going to be saving of lives -- not just in Puerto Rico, US Virgin Islands -- I'm especially concerned with St. Croix, that was also in the path of Hurricane Maria when it was a Category 5 hurricane," Zukunft said Wednesday.

People are still trying to get around floods/blocked roads to check on loved ones and see damage #HurricaneMaria #PuertoRico #cnn pic.twitter.com/9616OK62MK — Leyla Santiago (@leylasantiago) September 20, 2017

On the US Virgin Island of St. Thomas, retired New York police detective Austin Fields surveyed the damage to his residence.

"My home is no longer a home," he said.

Virgin Islands and Dominican Republic under the gun

Maria's wrath is far from over.

Dangerous storm surges "accompanied by large and destructive waves" will raise water levels 10 to 15 feet above normal tide levels in the hurricane warning areas of the southeastern Bahamas and the Turks and Caicos, the hurricane center said. The islands could also see as much as 20 inches of rain.

Some long-range models say Maria could move toward the North Carolina coast as it moves north. CNN Meteorologist Tom Sater said people should keep an eye on the storm.

Radars knocked out

Maria became the first hurricane of Category 4 strength or higher in 85 years to make a direct landfall on Puerto Rico.

The hurricane slammed the US territory with such intensity, it broke two National Weather Service radars there.

Roseau, Dominica, one of many towns devastated by Hurricane Maria.

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