Change of RusHydro's interest in SEC

January 16, 2015

Change of RusHydro's interest in Sakhalin Energy Company

JSC RusHydro (ticker symbol: MOEX, LSE: HYDR; OTCQX: RSHYY) announces that after the state registration of the report on the results of additional issue of JSC Sakhalin Energy Company's (JSC SEC) ordinary shares on December 26, 2014, the share of RusHydro in Sakhalin Energy Company's share capital changed as follows:

- before registration of the report on additional issue of shares: direct ownership amounted to 3,507,568 shares or 31.4899%; indirect ownership (owned through JSC RAO ES of East) - 1,000,000 shares or 8.9777%; total number of owned shares - 4,507,568 shares or 40.4676%

- after registration of the report on additional issue of shares: direct ownership amounts to 3,507,568 shares or 28.0862%; indirect ownership (owned through JSC RAO ES of East) - 1,000,000 shares or 8.0073%; total number of owned shares - 4,507,568 shares or 36.0935%.

The Company has been informed about the registration of the report on the results of additional issue of Sakhalin Energy Company's ordinary shares on January 16, 2015.

About RusHydro

RusHydro Group is one of Russia's largest generating companies. RusHydro is the leading producer of renewable energy in Russia with over 70 generating facilities in Russia and abroad. The company also manages a number of R&D, engineering and electricity retail companies. Group's thermal assets are operated by subsidiary - RAO Energy System of East in the Far East of Russia. Total electricity generation capacity of the Group is 37.5 GW, heat capacity - 16.2 thousand GCal/h.

Russian Federation owns 66.8% in RusHydro, the rest is held by other institutional and individual shareholders (over 360,000). The company's stock is traded on Moscow Exchange (MOEX), and included in MSCI EM и MSCI Russia indexes. Company's GDRs in the IOB section of LSE, ADRs - in OTCQX.

For more information:

Investor Relations Department

Tel. +7 (800) 333 8000 ext. 1607, 1319, 1304

[email protected]

DISCLAIMER

The information in this press release may contain projections or other forward-looking statements regarding future events or the future financial performance of RusHydro. One can identify forward-looking statements by terms such as "expect," "believe," "anticipate," "estimate," "intend," "will," "could," "may" or "might," the negative of such terms or other similar expressions. We wish to caution you that these statements are only predictions and that actual events or results may differ materially from these statements.

We do not intend to update these statements to reflect events and circumstances occurring after the date hereof or to reflect the occurrence of unanticipated events. Many factors could cause the actual results to differ materially from those contained in our projections or forward-looking statements, including, among others, general economic conditions, our competitive environment, risks associated with operating in Russia and rapid technological and market changes in our industries, as well as many other risks specifically related to RusHydro and its operations.