STATEMENT OF DATA WHICH MAY HAVE A MATERIAL EFFECT ON THE VALUE OF SECURITIES OF THE JOINT-STOCK COMPANY
"CONCERNING CHANGE IN THE STAKE HELD BY THE JOINT-STOCK COMPANY IN THE AUTHORIZED CAPITAL OF THE OTHER PROFIT-MAKING ORGANIZATION WHICH CONSTITUTES AT LEAST 5 PERCENT OR IN THE PERCENTAGE OF SHARES IN THE OTHER JOINT-STOCK COMPANY WHICH CONSTITUTES AT LEAST 5 PERCENT IF IT BECOMES HIGHER OR LOWER THAN 5, 10, 15, 20, 25, 30, 50 AND 75 PERCENT"

1. General Information

1.1. Full company name of the issuer Unified Energy System of Russia

1.2. Short company name of the issuer UES of Russia

1.3. Issuer's place of business: 119526, Moscow, pr. Vernadskogo, d. 101, korp. 3.

1.4. Issuer's OGRN (Primary State Registration Number): 1027700043293

1.5. INN (Taxpayer Identification Number): 7705018828

1.6. Issuer's unique code assigned by the registration agency: 00034-A

1.7. Webpage used by the issuer for disclosure of information: https://www.rao-ees.ru/ru/info/docs/show.cgi?content.htm and https://www.rao-ees.ru/ru/investor/reporting/show.cgi?content.htm

2. Content of Statement

2.1. Full name and place of business of profit-making organization in which the stake held by the joint-stock company in the authorized capital (the percentage of ordinary shares owned by the joint-stock company) changed:

- Kolyma Power Production Company (Open Joint-Stock Company for Power Industry and Electrification (OAO Kolymaenergo) – Russian Federation, 685030, Magadan, ulitsa Proletarskaya, dom 84, korpus 2.

2.2. Stake held by the joint-stock company in the authorized capital and percentage of ordinary shares in the subsidiary and dependent business entity before and after change:

- stake held by RAO UES of Russia in the authorized capital of (percentage of ordinary shares in) OAO Kolymaenergo before change: 78.63 %;

- stake held by RAO UES of Russia in the authorized capital of (percentage of ordinary shares in) after change: 70.32%.

2.3. Date of change in the stake held by the joint-stock company in the authorized capital of (percentage of ordinary shares in) the above-mentioned entity:

- The report on the results of additional issue of uncertificated registered ordinary shares in OAO Kolymaenergo was registered by the Federal Financial Markets Service of the Russian Federation on May 22, 2007.

3. Signature

Deputy Head of the Department for Corporate Governance and Shareholder Relations of the Corporate Center of RAO UES of Russia (under Power of Attorney No. 245 of December 19, 2006) I. A. Zenyukov

May 24, 2007