The platform, located 150 miles (250 kilometres) southeast of New Orleans, was slipping by around 20-30 degrees following the passing of the storm, but no injuries or leaks were reported. Dennis has however killed at least 62 people, the majority in the Caribbean.

"BP has re-boarded the platform and established power on the facility," according to a statement from the repair team. "Crews are now focusing their efforts on pumping operations in order to right the vessel."

The statement added that the platform waxs stil listing by about 20 degrees.

An oil-spill response vessel was on location to deal with any potential environmental issues, it added.

Thunder Horse was in development and due to start production at the end of

"We are still investigating the case to find out what was the precise cause of the problem," BP spokeswoman Julia Yakimova told AFP earlier, adding: "We don't know when the problem is going to be resolved frankly."

An underwater ROV (remotely operated vehicle) inspection "revealed no damage to the whole of the platform", while observation teams had concluded that "the platform is stable".

Workers were evacuated from all Gulf of Mexico oil facilities last Friday before Dennis struck, but have since begun returning to work after most infrastructures escaped its impact.

Thunder Horse is 75-percent owned by BP and a quarter-held by US oil giant ExxonMobil. It was to have with an eventual output of 250,000 barrels per day of oil and 5.7 million cubic metres of natural gas.

BP currently produces more than 300,000 barrels of oil equivalent per day in the area -- about 7.5 percent of the group's total daily production.

Meanwhile, the region was braced for another possible hurricane as Tropical Storm Emily roared across the Atlantic, just days after Dennis killed people in Cuba, Haiti, Jamaica and the southern United States.

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