Ukraine's anti-corruption bureau has announced a vast investigation into the country's energy sector, alleging a $US100 million ($A153 million) kickback scheme involving the state nuclear power company.

The bureau, a state agency that operates independently of the government, made the announcement as Ukraine braces for winter with its power sector under frequent fire by Russia and regularly facing power outages.

The agency alleged on social media that behind the scheme was a "high-level criminal organisation" led by a businessman and including a former adviser to the energy minister, nuclear power operator Energoatom's head of security and four "back office" workers.

"In total, approximately 100 million USD ($A153 million) passed through this so-called laundromat," the agency said.

Non

See Full Page