**Exhibit 12.1**

**CERTIFICATION**

I,      Djalma Bastos de Morais,certify that:

1.    I have reviewed this annualreport on Form 20-F of CEMIG;

2. Based on my knowledge, this report does not contain any untruestatement of a material fact or omit to state a material fact necessary inorder to make the statements made, in light of the circumstances under whichsuch statements were made, not misleading with respect to the period covered bythis report;

3. Based on my knowledge, the financial statements, and other financialinformation included in this report, fairly present in all material respectsthe financial condition, results of operations and cash flows of the registrantas of, and for, the periods presented in this report;

4. The company’s other certifying officer and I are responsible forestablishing and maintaining disclosure controls and procedures (as defined inExchange Act Rules 13a-15(e) and 15d-15(e)) and internalcontrol over financial reporting (as defined in Exchange Act Rules 13a-15(f)and 15d-15(f)) for the company and have:

a. designed such disclosure controls and procedures, or caused suchdisclosure controls and procedures to be designed under our supervision, toensure that material information relating to the company, including itsconsolidated subsidiaries, is made known to us by others within those entities,particularly during the period in which this report is being prepared;

b. designed such internal control over financial reporting, or causedsuch internal control over financial reporting to be designed under oursupervision, to provide reasonable assurance regarding the reliability offinancial reporting and the preparation of financial statements for externalpurposes in accordance with generally accepted accounting principles;

c. evaluated the effectiveness of the company’s disclosure controls andprocedures and presented in this report our conclusions about the effectivenessof the disclosure controls and procedures, as of the end of the period coveredby this report based on such evaluation; and

d. disclosed in this report any change in the company’s internalcontrol over financial reporting that occurred during the period covered by theannual report that has materially affected, or is reasonably likely tomaterially affect, the company’s internal control over financial reporting; and

5. The company’s other certifying officer and I have disclosed, basedon our most recent evaluation of internal control over financial reporting, tothe company’s auditors and the audit committee of company’s board of directors(or persons performing the equivalent functions):

a. all significant deficiencies and material weaknesses in the designor operation of internal controls over financial reporting which are reasonablylikely to adversely affect the company’s ability to record, process, summarizeand report financial information; and

b. any fraud, whether or not material, that involves management orother employees who have a significant role in the company’s internal controlover financial reporting.
|                           |   | /s/ Djalma Bastos de Morais    |   |
|---------------------------|--------|--------------------------------|--------|
|                      |   | Name: Djalma Bastos de Morais  |
|                      |   | Title: Chief Executive Officer |
| Date:  July 23, 2007 |   |                           |

 

A signed originalof this written statement required by Section 302 of the Sarbanes-OxleyAct of 2002 has been provided to the Company and will be retained by theCompany and furnished to the Securities and Exchange Commission or its staffupon request.

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