Notice of prolongation of share placement

May 16th, 2012

RusHydro announces prolongation of open subscription to shares of new issue

JSC RusHydro (ticker symbol: MICEX-RTS, LSE: HYDR; OTCQX: RSHYY) announces prolongation of the date of open subscription to shares of new issue (state registration no. 1-01-55038-Е-040D dated August 16, 2011) through June 29, 2012 (inclusive of this date). The prolongation of subscription is determined by specifics of procedure for receipt of budget funds and property, specified in the issuance documents.

Offers to purchase shares (hereinafter - offers) could be submitted daily from 10:00 to 17:00 Moscow time, other than on Saturdays, Sundays and public holidays at the address: JSC RusHydro, 51, Architect Vlasov Street, Moscow, 117393, or at the address of the broker JSC IK EVROFINANSY, 10 block 2 Shabolovka Street, Moscow, 119049. In accordance with resolution on the additional issue of securities and prospectus, RusHydro reserves the right to accept or decline received offers at its own discretion.

The Annual General Meeting of shareholders of RusHydro approved an increase of the Company's authorized share capital by issuing 89,000,000,000 additional ordinary shares with a par value of RUR 1 per share on June 30th, 2011 Detail information on the additional share issue is available at

 http://www.eng.rushydro.ru/investors/disclosure/securities_issue/shares/2011.

For more information:

JSC RusHydro, Investor Relations Department

Tel. +7 (495) 225-3232 ext. 1319, 1394, 1607

[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.