A TV image shows damage to the Sayano-Shushinskaya power station in southern Siberia where the death toll has risen to 14. (Rossiya TV Channel/Associated Press)

Rescue workers found two bodies Wednesday in the destroyed engine room of Russia's largest hydroelectric plant, raising the accident's official death toll to 14, officials said.

Sixty other workers are missing and feared dead at the massive Sayano-Shushenskaya power station in southern Siberia after an explosion during repairs Monday blew out walls and flooded the turbine room. Three of the plant's 10 turbines were destroyed and three others were damaged, plant owner RusHydro said.

The giant power station has been idle since.

Oleg Deripaska, the head of Rusal, the world's largest aluminum producer, visited the damaged power plant Wednesday to discuss with Russia's energy ministry and RusHydro how his factories will get power until the plant comes back online.

More than 70 per cent of all energy from the crippled hydroelectric plant goes to four Rusal smelters in Siberia, which are believed to be the company's most efficient plants.

1,000 rescuers search for the missing

Divers continued to scour the near-freezing waters that flooded the power plant for the missing workers but officials say there is little chance of finding anyone alive. About 1,000 rescue workers were involved in the search, Emergency Situations Minister Sergei Shoigu said.

Energy Minister Sergei Shmatko described the accident as "the biggest and most mysterious in global hydro energy" and said Wednesday it would cost 40 billion rubles [$1.25 billion US] to rebuild the power plant's engine room.

The cause of the accident was still unclear. Officials and the plant's owner have cited a faulty turbine and a rise of pressure in the pipes as possible causes.

The accident caused power shortages in several towns and major factories, but by Wednesday the energy ministry said the power supply in Siberia was stable and "uninterrupted." Energy from other power plants was being rerouted to cover the shortfall.

The accident also produced an oil slick that by Wednesday stretched over 100 kilometers down the Yenisei River.

The Sayano-Shushenskaya plant, located north of the Mongolian border, provides 10 per cent of Siberia's energy needs and is a key energy supplier for Siberian metallurgy.

The power plant's undamaged turbines could be switched on in a month and a half but the damaged turbines may take as much as two years to repair, RusHydro says.