CESP - COMPANHIA ENERGÉTICA DE SÃO PAULO CNPJ/MF N.º 60.933.603/0001-78 Publicly Listed Company NOTICE TO THE MARKET CESP – Companhia Energética de São Paulo, in compliance with what is stipulated in CVM Instruction no. 358/02, amended by CVM Instruction No. 449/07, in its Article 12, publicly discloses the following notice, dated May 06, 2013, received on this data from CREDIT SUISSE SECURITIES (EUROPE) LIMITED, through Credit Suisse (Brasil) S.A. Corretora de Títulos e Valores Mobiliários concerning its shareholder position in shares issued by this Company: “São Paulo, May 6, 2013. To: CESP – Companhia Energética de São Paulo Av. Nossa Senhora do Sabará, 5.312, Escritório 05 - Pedreira 04447-011, São Paulo – SP Att: Almir Fernando Martins Investor Relations Officer Ref.: Acquisition of relevant share participation – CVM Instruction 358, of January 3, 2002 Dear Sirs, Regarding the provisions in Article 12 of CVM Instruction 358/02, and in terms of CMN Resolution 2.689/00, we inform the following acquisition of preferential shares, class “B”, issued by CESP – Companhia Energética São Paulo (respectively, “Shares” and “Company”) by the Acquirer (qualified below): • The Acquirer, who had on April 30, 2013 8,378,938 shares (around 3.97% of total shares), acquired 4,949,500 shares on May 02, 2013, and became the owner of 13,328,438 shares (around 6.32% of total shares) (“Acquirer”), exceeding the 5% in total shares. I. The Acquirer’s name and qualification, showing the number of registration in the National Register of Legal Entities (CNPJ) or the Registry of Individuals • Investment portfolio (CMN Resolution 2.689/00) of Credit Suisse Securities ( Europe) Limited, a company located at One Cabot Square, E14 4QJ, London, United Kingdom, CNPJ/MF registration: 09.255.004/0001-95 (“Acquirer”), represented in Brazil by Credit Suisse (Brazil) S.A. Corretora de Títulos e Valores Mobiliários, a company located in the City of São Paulo, State of São Paulo, at Rua Leopoldo Couto de Magalhães Jr., 700, 10th to 14th floors (part), CNPJ/MF registration: 42.584.318/0001-07 (“CTVM”). II. The objective of the participation and amount involved, containing, if required, a statement of the Acquirer declaring that the intention of the acquisition is not to change the Company’s control composition and the administrative structure: • The acquisition is related to the return of a loan for Shares and, thus, it does not intend to change the Company’s control composition and the administrative structure. III. Quantity of shares, subscription bonus, as well as rights of share subscription and share acquisition options, by type and class, already held, directly or indirectly, by the Acquirer or someone related to the Acquirer: • This CTVM is aware that, on May 09, 2013, (i) Credit Suisse International, a company located at One Cabot Square, E14 4QJ, London, United Kingdom, CNPJ/MF registration: 09.280.823/0001-92, represented in Brazil by CTVM held 900 shares (around 0.0004% of total shares), and (ii) Credit Suisse International, a company located at One Cabot Square, E14 4QJ, London, United Kingdom, CNPJ/MF registration: 05.508.895/0001-93, represented in Brazil by Credit Suisse (Brazil) Distribuidora de Títulos e Valores Mobiliários S.A., a company located in the City of São Paulo, State of São Paulo, at Rua Leopoldo Couto de Magalhães Jr., 700, 10th to 14th floors (part), CNPJ/MF registration: 30.121.792/0001-13 (“CSI”), held 2,000 shares (around 0.001% of total shares). • Except for the information above, this CTVM is not aware that the Acquirer or that people related to the Acquirer own at this moment shares, subscription bonuses, subscription rights and/or share acquisition options issued by the Company. IV. Amount of debentures that can be converted into shares, already held, directly or indirectly, by the Acquirer or people related to the Acquirer, explaining the quantity of shares that can be converted, by type and class: • This CTVM does not have any information about the Acquirer or people related to the Acquirer owning debentures that can be convertible into shares issued by the Company. V. Indication of any agreement or contract regulating the practice of voting right or the acquisition or sale of securities issued by the Company: • This CTVM does not have any information about the Acquirer being part of any agreement of this type. Finally, we request the prompt transmission of information contained in this notice to the Comissão de Valores Mobiliários – CVM and BM&FBOVESPA S.A. – Bolsa de Valores, Mercadorias e Futuros, according to Article 12, paragraph 6, of CVM Instruction 358/02. We are at your disposal for further clarification Best Regards, _________________________________________________________________________ CREDIT SUISSE SECURITIES (EUROPE) LIMITED Through: Credit Suisse (Brasil) S.A. Corretora de Títulos e Valores Mobiliários” São Paulo, May 7, 2013. Almir Fernando Martins Financial Director and Investor Relations Officer