MOSCOW, October 4 (RIA Novosti) - The shares of Russian energy giant Unified Energy Systems (RAO UES) rose 5.7% on the RTS Stock Exchange Tuesday, amid rumors that the company plans to acquire a stake in Silovye Mashiny and over its negotiations with Western firms on Russia's power generating sector, an RTS analyst said.

The analyst said UES was seeking to buy a 22.43% stake in Silovye Mashiny (Power Machines), Russia's leading manufacturer of equipment for hydro, thermal, gas, and nuclear power plants.

According to the expert, UES is negotiating an option for Western companies to acquire stakes in Russia's power generating companies.