On July 22, 2010, after completion of all repair and commissioning works at RusHydro’s (ticker symbol: HYDR; MICEX, RTS and LSE) Sayano-Shushenskaya HPP, the operational tests of the unit ¹ 4 started to be carried out according to the approved program with the continuous control of electric parameters, temperature and vibrating condition of the unit. As a result, the unit ¹ 4 will be included into the grid for complex testing of the primary and ancillary equipment work with the maximum loading within 72 hours. According to the complex tests the unit will be ready for launching under load. The commissioning of restored unit ¹4 must take place in August this year in line with the Sayano-Shushenskaya HPP restoration plan.