The owner of Russia's largest hydroelectric plant says there is little chance that any of the 64 workers missing after an accident could be found alive.

RusHydro spokesman Yevgeny Druzyaka told The Associated Press on Tuesday that the search for those workers is still continuing but the chances of finding them alive look dim.

There are 12 confirmed deaths in Monday's accident at the Sayano-Shushenskaya plant in southern Siberia. Officials said the workers were drowned or crushed.

The accident shut the power plant down and left several towns and major factories without electricity. Supplies from other power plants were being rerouted to help cover the shortfall.

RusHydro says a faulty turbine at the plant launched in 1978 is likely to blame for the accident.