Table of Contents

FORM 6-K

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C.  20549

REPORT OF FOREIGN PRIVATE ISSUER
PURSUANT TO RULE 13a-16 OR 15d-16 OF
THE SECURITIES EXCHANGE ACT OF 1934

For the month of August 2013

Commission File Number 1-15224

Energy Company of Minas Gerais

(Translation of Registrant’s Name Into English)

Avenida Barbacena, 1200

30190-131 Belo Horizonte, Minas Gerais, Brazil

(Address of Principal Executive Offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F x Form 40-F o

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): o

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): o

Indicate by check mark whether by furnishing the information contained in this Form, the registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes o No x

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b):  N/A

Table of Contents

Index

2

Table of Contents

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

3

Table of Contents

1.              Material Announcement dated July 31, 2013: Acquisition of a Small Hydro Plants

4

Table of Contents

COMPANHIA ENERGÉTICA DE MINAS GERAIS – CEMIG

LISTED COMPANY

CNPJ 17.155.730/0001-64  –  NIRE 31300040127

MATERIAL ANNOUNCEMENT

On acquisitions of small hydro plants

Cemig (Companhia Energética de Minas Gerais), a listed company with securities traded on the stock exchanges of São Paulo, New York and Madrid, in accordance with CVM Instruction 358 of January 3, 2002, as amended, hereby publicly informs the Brazilian Securities Commission (CVM), the São Paulo Stock, Commodities and Futures Exchange (BM&F Bovespa S.A.) and the market in general, as follows:

Media reports on July 30, 2013 stated that Cemig is studying the possibility of acquisition of small hydroelectric plants (PCHs), with the participation of Renova.

Light Energia S.A., a wholly-owned subsidiary of Light S.A., is a member of the block holding stockholding control of Renova.

Cemig hereby reports that Renova and its controlling stockholders (RR Participações S.A. and Light Energia S.A.) are negotiating with Cemig for Renova to participate in the acquisition of the company Brasil PCH S.A.

Cemig recently signed a share purchase agreement for acquisition of 49% of the share capital of Brasil PCH S.A.  This percentage could increase to 100% if the other stockholders of Brasil PCH S.A. exercise the right of joint sale that they have under the stockholders’ agreement.

Negotiations have not been completed, and to date no decision has been approved by the corporate decision bodies of Cemig. If the negotiations develop into a concrete transaction, their terms and conditions will be published to the market.

Cemig will keep its stockholders and the market opportunely and appropriately informed on the conclusion of this transaction.

Belo Horizonte, July 31, 2013.

Luiz Fernando Rolla

Chief Finance and Investor Relations Officers

Av. Barbacena 1200      Santo Agostinho      30190-131 Belo Horizonte, MG      Brazil      Tel.: +55 31 3506-5024     Fax +55 31 3506-5025

This text is a translation, provided for information only. The original text in Portuguese is the legally valid version.

5

Table of Contents

2.              Material Announcement dated August 8, 2013: Decision to Apply for Rescission of the Itaocara Hydroelectric Plant Concession

6

Table of Contents

COMPANHIA ENERGÉTICA DE MINAS GERAIS – CEMIG

LISTED COMPANY

CNPJ 17.155.730/0001-64  –  NIRE 31300040127

MARKET ANNOUNCEMENT

Decision on the Concession for the Itaocara Hydroelectric Plant

Cemig (Companhia Energética de Minas Gerais), a listed company with securities traded on the stock exchanges of São Paulo, New York and Madrid, hereby – in accordance with CVM Instruction 358 of January 3, 2002 as amended, and complementing its Market Announcement of July 6, 2013 – informs the Brazilian Securities Commission (CVM), the São Paulo Stock Exchange (BM&F Bovespa S.A.) and the market in general, as follows:

On June 8, 2013 the Boards of Directors of Cemig, and of its wholly-owned subsidiary Cemig GT (Cemig Geração e Transmissão S.A.) – which holds 49% of the Itaocara Hydroelectric Plant Consortium (Consórcio UHE Itaocara) (“the Consortium”) – decided to apply to the Brazilian electricity regulator, Aneel, for rescission of Concession Contract 12/2001 (“the Concession contract”) under Clause 4 of Law 9074/2005, introduced by Law 12839/2013.

The initial plan and project for the Itaocara Plant (“the Project”) faced environmental obstacles, and the license application for it was set aside, because the Brazilian environment authority, Ibama, decided it was not feasible. However, over a period of years, the Consortium determinedly sought alternatives that would make the Project environmentally feasible and enable the impediments to be overcome. This resulted in the Project being altered, as per Aneel Dispatch 3634 of September 6, 2011, which specified installed capacity of 145 MW. As a result, it was only in December 2011 that Prior Environmental License 428/2011 was obtained, enabling the next stage – application for the Environmental Construction License – to take place. This License was finally issued on July 29, 2013.

The decision to apply for rescission of the Concession Contract is based on the impossibility, in view of the above factors, of sustaining economic and financial equilibrium for the Concession Contract following the decision  by the Mining and Energy Ministry to refuse an application to alter the period of the Concession – to a period of 35 years from the grant of the Prior License – since without this change 12

Av. Barbacena 1200      Santo Agostinho      30190-131 Belo Horizonte, MG      Brazil      Tel.: +55 31 3506-5024     Fax +55 31 3506-5025

This text is a translation, provided for information only. The original text in Portuguese is the legally valid version.

7

Table of Contents

years have been lost from the period of the concession, reducing the time of revenue to less than the period necessary for the return on the investment.

Cemig GT also advises the public that its intention would be to continue to hold the Concession Contract in the event that any supervening decision by the concession-granting power, or any legislative decision, should make commercial operation of the Project financially viable.

Cemig GT may also, if its sees fit, take part in any future auction for the concession of the Project.

Finally, the Company informs the public that the rescission of the Concession Contract referred to above will not result in any financial charge or burden for Cemig GT, since it has the rights guaranteed by Article 4–A of Law 9074 of 2005, introduced by Law 12839/2013, in regard to:

(i)                   release from guarantees of compliance with obligations under the Concession Contract;

(ii)                non-payment for Use of a Public Asset; and

(iii)             reimbursement of the costs incurred in preparation of studies or projects.

Cemig will keep its stockholders and the market opportunely and appropriately informed on the progress of this matter.

Belo Horizonte, August 8, 2013.

Luiz Fernando Rolla

Chief Finance and Investor Relations Officer

Av. Barbacena 1200      Santo Agostinho      30190-131 Belo Horizonte, MG      Brazil      Tel.: +55 31 3506-5024     Fax +55 31 3506-5025

This text is a translation, provided for information only. The original text in Portuguese is the legally valid version.

8

Table of Contents

3.              Market Announcement dated August 8, 2013: Investment Agreement Relating to Renova and Brasil PCH

9

Table of Contents

COMPANHIA ENERGÉTICA DE MINAS GERAIS – CEMIG

LISTED COMPANY

CNPJ 17.155.730/0001-64  –  NIRE 31300040127

MATERIAL ANNOUNCEMENT

Investment Agreement relating to Renova and Brasil PCH

Cemig (Companhia Energética de Minas Gerais), a listed company with securities traded on the stock exchanges of São Paulo, New York and Madrid, hereby — in accordance with CVM Instruction 358 of January 3, 2002, as amended — publicly informs the Brazilian Securities Commission (CVM), the São Paulo Stock, Commodities and Futures Exchange (BM&F Bovespa S.A.) and the market in general, as follows:

On August 8, 2013 Cemig’s wholly-owned subsidiary Cemig GT (Cemig Geração e Transmissão S.A.) approved signature of an Investment Agreement with Renova Energia S.A. (“Renova”), RR Participações S.A. (“RR”), Light Energia S.A. (“Light Energia”) and Chipley SP Participações S.A. (“Chipley”), governing the entry of Cemig GT into the controlling stockholding block of Renova, through subscription by Cemig GT of new shares to be issued by Renova, and the structuring of Chipley as a vehicle for growth, in which equity interests would be owned by Cemig GT and Renova, with assignment to Chipley of the Agreement for Purchase of Shares in Brasil PCH S.A. signed on June 14, 2013 by Cemig GT and Petrobras (Petróleo Brasileiro S.A.) (“the Brasil PCH Share Purchase Agreement”).

The issue price for the shares in Renova has been set at R$ 16.2266 per common share, in accordance with Article 170, §1, I of the Brazilian Corporate Law, resulting in a value of up to R$ 1,414,732,915.53 for the portion of the increase in the share capital of Renova to be subscribed by Cemig GT — both amounts to be updated by the CDI Rate from December 31, 2012.

The company further informs the public that this transaction is subject to conditions precedent and commercial conditions. When and if these conditions are fulfilled, the precise amount of the increase in the capital of Renova will decided, and a new stockholders’ agreement will be signed to include Cemig GT, RR and Light Energia in the controlling stockholding block of Renova, under which the total number of shares bound by that stockholders’ agreement will be at least 51% of the common shares of Renova.

Cemig will keep its stockholders and the market opportunely and appropriately informed on the conclusion of this transaction.

Belo Horizonte, August 8, 2013.

Luiz Fernando Rolla

Chief Finance and Investor Relations Officer

Av. Barbacena 1200      Santo Agostinho      30190-131 Belo Horizonte, MG      Brazil      Tel.: +55 31 3506-5024     Fax +55 31 3506-5025

This text is a translation, provided for information only. The original text in Portuguese is the legally valid version.

10

Table of Contents

4.              Summary of Principal Decisions of the 573rd Meeting of the Board of Directors held on August 8, 2013

11

Table of Contents

COMPANHIA ENERGÉTICA DE MINAS GERAIS – CEMIG

LISTED COMPANY

CNPJ 17.155.730/0001-64  –  NIRE 31300040127

BOARD OF DIRECTORS

Meeting of August 8, 2013

SUMMARY OF PRINCIPAL DECISIONS

The Board of Directors of Cemig (Companhia Energética de Minas Gerais), at its 573rd meeting, held on August 8, 2013, decided the following:

1.         Signature of the legal instruments relating to the financings of Santo Antônio Energia S.A.

Av. Barbacena 1200      Santo Agostinho      30190-131 Belo Horizonte, MG      Brazil      Tel.: +55 31 3506-5024     Fax +55 31 3506-5025

This text is a translation, provided for information only. The original text in Portuguese is the legally valid version.

12

Table of Contents

5.              Summary of Principal Decisions of the 574th Meeting of the Board of Directors held on August 8, 2013

13

Table of Contents

COMPANHIA ENERGÉTICA DE MINAS GERAIS – CEMIG

LISTED COMPANY

CNPJ 17.155.730/0001-64  –  NIRE 31300040127

BOARD OF DIRECTORS

Meeting of August 8, 2013

SUMMARY OF PRINCIPAL DECISIONS

At its 574th meeting, held on August 8, 2013, the Board of Directors of Cemig (Companhia Energética de Minas Gerais) decided the following:

1.              Proposal to the EGM to be held at 11 a.m. on September 10, 2013, for orientation of vote in the EGM of Cemig GT, which will decide on reduction of the share capital of that Company following the transfer to Cemig of the equity interest in Taesa held by Cemig GT.

2.              Specific Collective Employment Agreement for Profit Sharing for 2013—2014.

3.              Signature of a working agreement with INDI for secondment of employees.

4.              Signature of a corporate surety guarantee letter with Ventos Potiguares Comercializadora de Energia S.A.

5.              Orientation of vote in meetings of Taesa and waiver of right of first refusal in Transleste.

6.              Ratification of the appointment of a director of Cemig as member of the Board of Directors of Gasmig, and orientation of vote in the EGM of Gasmig deciding on the subject.

7.              Ratification of the appointment of Managers for Gasmig.

8.              Signature of a term of agreement with MDU Resources Luxembourg II LLC, S.À.R.L.

9.              Ratification of signature of a letter of intent, and amendment, with the State of Minas Gerais, SEDE, SEF, BDMG, INDI and Guanhães Energia S.A.

10.       Signature of a mutual cooperation working agreement with the State of Minas Gerais.

11.       The Jequitibá II Project.

12.       Orientation of vote in a meeting of the Board of Directors of Light on the rescission of Concession Contract 012/2001, relating to the Itaocara Hydroelectric Plant.

Av. Barbacena 1200      Santo Agostinho      30190-131 Belo Horizonte, MG      Brazil      Tel.: +55 31 3506-5024     Fax +55 31 3506-5025

This text is a translation, provided for information only. The original text in Portuguese is the legally valid version.

14

Table of Contents

6.              Material Announcement: Presentation of Second Quarter 2013 Results

15

Table of Contents

7.              Earnings Release Announcement of Second Quarter 2013 Results

37

Table of Contents

ANNOUNCEMENT OF 2Q13 RESULTS

CEMIG REPORTS

NET INCOME OF R$ 617 MILLION

FOR 2ND QUARTER 2013

Highlights

·                                          2Q13 Cash flow (Ebitda):  R$ 1.2 billion

·                                          2Q13 Net revenue:  R$ 3.4 billion

·                                          2Q13 Revenue from transactions on CCEE:

·                                          R$ 262mn — up more than 147% from 2Q12 (R$ 106mn).

·                                          Gain of R$ 284mn on disposal of TBE to Taesa.

38

Table of Contents

Conference call and webcast

Announcement of Second Quarter 2013 Results

Video Webcast and Conference Call

August 14 , 2013 (Wednesday), 10 a.m. Brasília time

(9 a.m. New York)

Simultaneous translation in English

PARTICIPATE LIVE:

PLAYBACK:

39

Table of Contents

Cemig Investor Relations:

http://ri.cemig.com.br/

ri@cemig.com.br

Tel — (31) 3506-5024

Fax — (31) 3506-5025

Executive Investor Relations Team

Chief Finance and Investor Relations Officer

Luiz Fernando Rolla

General Manager, Investor Relations

Antonio Carlos Vélez Braga

Investor Markets Manager

Stefano Dutra Vivenza

40

Table of Contents

Contents

41

Table of Contents

Disclaimer

Certain statements and estimates in this material may represent expectations about future events or results, which are subject to risks and uncertainties that may be known or unknown. There is no guarantee that the events or results will take place as referred to in these expectations.

These expectations are based on the present assumptions and analyses from the point of view of our management, in accordance with their experience and other factors such as the macroeconomic environment, market conditions in the electricity sector, and expected future results, many of which are not under Cemig’s control.

Important factors that could lead to significant differences between actual results and the projections about future events or results include Cemig’s business strategy, Brazilian and international economic conditions, technology, Cemig’s financial strategy, changes in the electricity sector, hydrological conditions, conditions in the financial and energy markets, uncertainty on our results from future operations, plans and objectives, and other factors. Because of these and other factors, Cemig’s results may differ significantly from those indicated in or implied by such statements.

The information and opinions herein should not be understood as a recommendation to potential investors, and no investment decision should be based on the veracity, currentness or completeness of this information or these opinions. None of Cemig’s professionals nor any of their related parties or representatives shall have any liability for any losses that may result from use of the content of this material.

To evaluate the risks and uncertainties as they relate to Cemig, and to obtain additional information about factors that could originate different results from those estimated by Cemig, please consult the section on Risk Factors included in the Reference Form filed with the Brazilian Securities Commission (CVM) and in the 20-F form filed with the U.S. Securities and Exchange Commission (SEC).

42

Table of Contents

From the CEO and CFO

Cemig’s CEO, Mr. Djalma Bastos de Morais, comments:

The results for the second quarter of 2013 are in line with the guidelines set out in our Long-Term Strategic Plan.  The challenges introduced into the electricity sector in 2012, of which the Company is still feeling the effects, show that at this moment the strategy of sustainable growth becomes even more important, in expanding the operations that can add value to our business and provide our stockholders with adequate and attractive return on their investments.  The acquisition of interest of Brasil PCH, one of Brazil’s leading independent companies generating electricity from renewable sources, is part of this context. As well as growing through mergers and acquisitions, we continue to invest strongly in our concession area, with investments in the order of R$ 560mn in the distribution business. We are working to enable this strategy to result in firm consolidation of our position as one of the largest groups in the Brazilian electricity sector by the end of this decade.”

Cemig’s Chief Finance and Investor Relations Officer, Mr. Luiz Fernando Rolla, comments:

“In this second quarter of 2013 Cemig has continued to produce robust cash flow. Operational cash flow, as measured by Ebitda, was R$ 1.25 billion in the quarter, 3.3% more than in first quarter 2012.  This is in line with what was expected for the period, and also in line with our Ebitda guidance for the full year of 2013: between R$ 5.8 and R$ 6.4 billion. Thus we can say that our strategy of improving operational efficiency and achieving gains from synergy and growth — whether through acquisitions or through participation in new projects — has certainly been effective. Cemig’s net income for 2Q13 is R$ 617 million, with a cash position of R$ 4.4 billion at the end of the second quarter. These two figures serve to guarantee execution of both our Long-Term Strategic Plan and our dividend and debt management policies, continuing to identify Cemig as an increasingly solid company, with efficient corporate management.”

43

Table of Contents

Summary Economic Outlook

One of the principal concerns on the international economic outlook has been the possible reduction of the stimulus program for the US economy. With a recovery in the US economic activity in the first quarter, these rumors gained strength, considerably affecting international markets.

The US reported GDP growth of 1.7% in the second quarter, above the forecast 0.9%. In addition, an improvement was reported in the US labor market, with an unemployment rate reported in June of around 7.5% — although this is still above levels regarded as comfortable. Inflation, as measured by the PCE (personal consumer spending) index, remained below the 2% level stipulated as a target by the FOMC (Federal Reserve Open Markets Committee), decelerating in the quarter. Other indicators published during the second quarter point to weaker performance of the US economy, postponing a possible reduction in the program.

Within the eurozone, the current chairman of the European Central Bank, Mario Draghi, continued to defend accommodative monetary policies, with a view to promoting the economic recovery of the block. By keeping interest rates low, the government hopes to encourage lending to the private sector.

Despite government efforts to engineer a recovery of the European economy, the unemployment rate in the eurozone remained high, closing June at 12.1% — stable from March. Inflation nevertheless rose to 1.6%. Under this scenario of high unemployment, low inflation and a deceleration of the economy, the OECD is forecasting a 0.1% contraction in eurozone GDP growth.

On China, the concern is with a possible further economic slowdown. After several releases of lower than expected figures in the second quarter — including figures for exports and imports — a number of analysts reduced their 2013 GDP forecasts to 7.5%. The possible deceleration of the second largest economy in the world could pressure commodity prices, principally affecting emerging markets.

44

Table of Contents

In Brazil, the uncertainties on the global economy, especially the US and China, were the main factor containing aggregate demand. The IBGE reported Brazilian GDP growth of only 0.6% in 1Q13. On the supply side, the main engines of this growth were farming, with growth of 9.7%, and capital investment.

Brazilian industry is indicating a gradual and irregular recovery, with monthly results in the first quarter alternating between significant rises and sharp falls. IBGE quarterly data report industrial production growing 1.1% in 2Q13 from the previous quarter, and 4.3% year-on-year. The positive result for June (which reversed the sharp fall in May) was due above all to the upturn in construction and in mining.

Despite the fall in business and consumer confidence indices, reflecting several factors — concerns on the economic scenario, the impact of the demonstrations in Brazil, and the possible reduction of stimulus in mature economies — capacity utilization has remained stable, with slight falls in some months.

In the labor market, the unemployment rate increased by 2 percentage points in June to 6%. Effective average worker wages were down month-on-month in May, but up 1.33% year-on-year.

The Brazilian Central Bank’s Focus Report for June reduced its reported consensus forecast for 2013 GDP growth to 2.4% — a further reduction from 3.3% at the start of the year.

We would highlight that we continue to believe that the long-term outlook for the Brazilian economy is positive. The staging of major sporting events, and investments in the oil and gas sector — among other projects — represent singular opportunities for the country to improve its infrastructure and at the same time to boost its economy. And we believe this means positive effects for the electricity sector, since electricity generation and distribution tend to grow at the same rate as industry as a whole.

45

Table of Contents

According to the Brazilian Energy Research Company (Empresa de Pesquisa Energética — EPE), total electricity consumption through Brazil’s National Grid was up 2.8% YoY in the first half of 2013, up 3.0% year-on-year in the second quarter, and up 2.7% in the first quarter.

The consumer group contributing most to this growth was the Residential category, with year-on-year consumption growth of 6% in the first half of the year. This consumer base grew by 3.3%, to more than 62.6 million units, with an increase of almost 2 million in a year. The expansion in private consumption was due, among other factors, to increased ownership and use of household appliances. In part, this is associated with favorable conditions of employment, income and lending, and reduction in the tax burden, in recent months. There was also strong growth, of 5.5% year-on-year, in the Commercial and Services category in the half-year.

Industrial consumption was up 1.1% year-on-year in the second quarter, which compares with a YoY contraction of 2.2% in 1Q13. Taking into account seasonally adjusted series, this result nevertheless does not yet provide signals of a sustained recovery in industrial consumption. The metal and aluminum industries were principally responsible for this weak performance. In the half-year, consumption was down 0.5%.

For 2013, the EPE is forecasting growth of 4.5% in consumption via the national grid, assuming a gradual recovery in industrial production throughout the year, with the connection to the grid of the Northern System (Tucuruí-Macapá-Manaus), resulting in a growth rate of 5.2% for April—December 2013, compared to the 2.7% reported for 1Q13.

46

Table of Contents

Cemig’s shares — Performance

Sources: Economática, Latibex.

Total trading volume in Cemig’s preferred shares (CMIG4) in 2Q13 was R$ 5.7 billion. This level maintains CMIG4 as the most liquid share in the Brazilian electrical sector, and one of the most widely traded shares in the Brazilian capital market.

On the New York Stock Exchange, trading in ADRs for our preferred shares (CIG) in second quarter 2013 totaled US$2 billion, reflecting the recognition of investors, and again affirming Cemig’s status as a global investment option.

The Ibovespa, the benchmark index for the performance of the São Paulo Stock Exchange, fell by 15.78% over the period, ending the second quarter at 47,457 points. The negative performance reflected growing investor pessimism on the Brazilian economy. This can be seen in the increase in investors’ short positions, and the outflow of foreign capital. With Ibovespa at historic lows, it is possible to perceive a possibility of its recovering in coming quarters, supported by a possible strengthening of internal policy and a reversal of capital flows.

Cemig’s shares appreciated in 2Q13 — the common shares appreciated 0.26% and the preferred shares appreciated 0.75% — both considerably outperforming the Ibovespa and the Brazilian electricity sector index. Hence Cemig’s shares were good investment options over the period. The uptrend in Cemig’s share prices could also be interpreted as a recovery from the effects of Law 12783/13 (the former MP 579).

47

Table of Contents

Stock performance up to August 12th

Cemig’s long term ratings

The leading rating agencies have maintained their long-term credit ratings for Cemig:

Economic information — summary

48

Table of Contents

Adoption of IFRS

The results below are reported under the new Brazilian accounting practices, reflecting harmonization of Brazilian accounting rules with IFRS.

INCOME AND LOSS ACCOUNTS

FOR THE SECOND QUARTERS OF 2013 AND 2012

R$ ’000 (except Net income per share)

49

Table of Contents

Cemig’s consolidated electricity market

The figures we report for Cemig’s market comprise the sale of electricity by Cemig D and Cemig GT.

This market can be summarized as: sales of electricity to captive and free consumers, in the concession area of the Brazilian state of Minas Gerais, and outside that state; sales of electricity to other agents of the electricity sector in Brazil’s Free and Regulated Markets; sales under Brazil’s Program to Encourage Alternative Electricity Sources (“Proinfa”); and sales on the CCEE (Brazil’s wholesale electricity market); with elimination of transactions between companies of the Cemig group.

The volume of electricity sold to final consumers in Cemig’s concession area in 2Q13 was 3.1% lower than in 2Q12.

This chart shows the breakdown of the Cemig Group’s sales to final consumers:

50

Table of Contents

The volume of electricity energy sold to final consumers in Cemig’s concession area during the second quarter of 2013 has decreased 3,1% YoY.

(*) Includes Electricity Sale Contracts in the Regulated Environment (CCEARs) and ‘bilateral contracts’ with other agents.

The notes below comments on the various consumption categories:

Residential:

Residential consumption was 16.00% of the total of electricity transacted by Cemig in 2Q13. The figure 8.44% higher than in 2Q12 is associated with the number of consumer units being 2.7% higher, than in 2Q12. The increase in consumption is directly related to the increase of 182,366 in the number of consumers invoiced by Cemig D in 2Q13, and also to average monthly temperatures — which were higher than historic averages in the quarter.

Industrial

Industrial consumption was 38.14% of the total electricity sold by Cemig in 2Q13.

51

Table of Contents

The year-on-year reduction of 10.40% from 2Q12 is associated with the weak performance of the industrial sector in Minas Gerais, and the migration of clients to the free market and the ‘special free market’, over the course of 2012.

Commercial:

The total volume of electricity transacted with this user group accounted for 10.10% of Cemig’s total in 2Q13, and was 6.23% more than the volume transacted in 2Q12.

This higher figure is due to the increase of 2.25% in the number of consumers.

Rural:

The level of rural consumption, at 4.7% of the total volume of electricity sold, was stable in 2Q13 compared to 2Q12.

Other user categories:

The total of other types of consumption in 2Q13 — by public authorities, public illumination, public services, and Cemig’s own consumption — represented 5.72% of Cemig’s total transactions in electricity in the quarter, and was 4.26% higher than in 2Q12.

Supply to other concession holders

The electricity used by captive clients was 25.34% of the volume transacted in the second quarter, 22.08% more than in 2Q12.

52

Table of Contents

The electricity market of Cemig D

The concession area of Cemig D (Cemig Distribuição S.A.) covers 567,748 km², approximately 97% of the Brazilian State of Minas Gerais. Cemig D has four electricity distribution concessions in Minas Gerais, under four concession contracts — for the Western, Eastern, Northern and Southern areas of the State.

Total sales of electricity by Cemig D to its captive market were 4.3% higher than in 2Q12, reflecting an increase in consumption — although the number of new consumers added in 2Q13 (19,758 new consumers) was approximately 57.11% lower than the number of new consumers added in 2Q12 (46,070).

7,631,376 consumers were invoiced in June 2013, 2.7% more than in June 2012. Of this total, 7,630,978 are captive consumers, totaling 2.7% more than in the previous year, and 398 — a year-on-year increase of 15.7% — are “Free Consumers”, which use the distribution network of Cemig D.

The electricity market of Cemig GT

The consolidated total of electricity sold by Cemig GT means the total of sales made: (I) in the Free Market, to Free Consumers — in Minas Gerais and other states — and to other generators and traders; (II) in the Regulated Market, to distributors — and (III) wholesale sales, in the CCEE (Brazil’s Electricity Trading Chamber).

Cemig GT’s electricity market was 0.6% smaller, in aggregate, in 2Q13 than in 2Q12. This mainly reflects a total of electricity sold to industrial clients 11.83% lower than in 2Q12, due to the continuing slowdown in industrial activity, the effect being nearly offset by a volume of electricity sold to other concession holders 15.5% higher.

53

Table of Contents

Balance of sources and uses of electricity — MWh

Consolidated operational revenue

Overall revenue from supply of electricity

Revenue from total supply of electricity in 2Q13 was R$ 3.1 billion, 9.41% less than the total for 2Q12 of R$ 3.4 billion.

The main factors affecting revenue in 2Q13 were:

·                      Tariff adjustment in Cemig D, with average impact on consumer tariffs of 3.85%, from April 8, 2012 (full effect in 2013).

·                      Volume of energy invoiced to final consumers 3.06% lower (this excludes Cemig’s own internal consumption).

·                      Average tariff reduction for captive consumers of 18.14%, obeying the Extraordinary Tariff Review legislated by Provisional Measure 579, of September 11, 2012. The tariffs were applied from January 24, 2013 to April 7, 2013, the date of completion of the Ordinary Tariff Review process — which is scheduled to take place every 5 years during the concession period.

·                      Tariff Review, with 2.99% average effect on consumer tariffs, from April 8, 2013.

·                      Average price per MWh 6.55% lower in Reais in 2Q13 than in 2Q12.

54

Table of Contents

(*) Includes Contracts for Sale of Electricity in the Regulated Market (CCEARs), and ‘bilateral contracts’ with other agents.

Revenue from wholesale electricity sales

Although the increase of 22.8% in the quantity of electricity sold to other concession holders was accompanied by an increase of 14.87% in the revenue from electricity sold (R$ 451.8 million in 2Q12, vs. R$ 393.3mn in 2Q12), the average price of electricity sold was 5.90% lower, at R$ 119.65/MWh in 2Q13, compared to R$ 127.16/MWh in 2Q12.

Revenue from Use of Distribution Systems (the TUSD charge)

Cemig D’s revenue from the TUSD charge (tariff for use of the distribution system) was R$ 220.2 million in 2Q13, a reduction of 51.91% compared to 2Q12 (R$ 457.8mn). This change is due mainly to the reduction in the tariff — effectively of 33.22 for Free Consumers, from April 8, 2013 — associated with the reduction in activity of the industrial sector, which resulted in the volume of electricity transported in 2Q13 being 5.54% lower than in 2Q12.

Transmission Concession Revenue

Transmission concession revenue in 2Q13 was R$ 115.6mn, vs. R$ 160.5mn in 2Q12, a reduction of 27.95%. This change is mainly because of the renewals of the Company’s older transmission concessions, under which, starting in 2013, the Company is now remunerated only for operation and maintenance of the infrastructure, in accordance with the terms of Provisional Measure 579 (converted into Law 12783/13).

55

Table of Contents

Revenue from transactions in electricity on the CCEE

Revenue from transactions in electricity on the Electricity Trading Chamber (CCEE) in 2Q13 was R$ 261.6mn, an increase of 146.66%. This difference is mainly due to the greater availability of power for settlement on the spot market, together with the much higher average spot price (R$ 288.24 per MWh in 2Q13, vs. R$ 115.40 per MWh in 2Q12).

Other operational revenues

This total includes charged services, sharing of infrastructure, the subsidy for the low-income electricity tariff, and other services provided under the concession. This line was 110.56% higher in 2Q13, at R$ 246.9mn, than in 2Q12 (R$ 117.3mn). The higher figure is due to a pass-through of funds from the Energy Development Account (Conta de Desenvolvimento Energético, or CDE) in the amount of R$ 136mn, in 2Q13, under Law 12783/13, to compensate for the fact that subsidies in the TUSD (Tariff for Use of the Distribution System — Tarifa de Uso do Sistema de Distribuição) were not incorporated into the tariff.

Sector / regulatory charges deducted from revenue

The sector charges, which reduce operational revenue, totaled R$ 1.20 billion in 2Q13, 21.79% less than their total of R$ 1.53 billion in 2Q12. This is mainly the result of the application of Provisional Measure 579, which reduced the charge to the consumer for the Energy Development Account (CDE) by 75%, abolished the sharing of the Fuel Consumption Account (Custo de Consumo de Combustível, or CCC), and also ceased the charging of the Global Reversion Reserve (Reserva Global de Reversão, or RGR) to holders of concessions and permissions.

Other deductions from revenue in this category are taxes, calculated as percentages of revenue — hence their variations are, substantially, in proportion to Revenue.

56

Table of Contents

Operational costs and expenses

Operational costs and expenses (excluding Net financial revenue (expenses)) in 2Q13 totaled R$ 2.758 billion, 9.81% more than in 2Q12 (R$ 2.512 billion).

The notes below are on the year-on-year variations in expenses:

Electricity bought for resale

The expense on electricity bought for resale in 2Q13 was R$ 1.30 billion, 20.72% more than in 2Q12 (R$ 1.08 billion). This mainly reflects the following:

·                  Purchases of electricity in the free market R$ 141mn higher in 2013, as a result of (i) higher sales activity, and (ii) the higher cost of acquisition due to the increase in the price of electricity in the Brazilian market;

·                  Reduction in the total of expenditure on electricity bought in the spot market via the CCEE, as a result of the reimbursement — by the Federal Government — of a part of these costs, totaling R$ 133 mn.

·                  Expenses on electricity acquired in auctions 9.80% higher, at R$ 537mn in 2Q13, compared to R$ 489 million in 2Q12 — arising from availability contracts, reflecting expenses on fuel for generation of electricity by the thermal plants.

·                  Allocation to the distributors taking part in the National Grid of guarantee quotas of energy and power from the plants whose concessions were renewed under Law 12783 of January 11, 2013.

57

Table of Contents

·                  The expense on electricity from Itaipu was 9.02% higher, since it is indexed to the dollar: it was R$ 247mn in 2Q13, vs. R$ 226mn in 2Q12. Among other factors, this reflects the depreciation of the Real against the dollar in the second quarter of 2013, compared to its appreciation during 2Q12. The average dollar exchange rate for invoices of the second quarter of 2013 was R$ 2.019/US$, compared to R$ 2.082/US$ in 2Q12 — a difference of 3.11%.

Charges for the use of the national grid

Expenses on charges for the use of the transmission grid were R$ 128 million in 2Q13, 41.28% less than in 2Q12 (R$ 218 million). This is the result of the reduction of sector charges legislated by Provisional Measure 579.

Personnel

Personnel expenses in 2Q13 were R$ 263mn, 1.37% less than in 2Q12 (R$ 266mn).

Depreciation and amortization

Depreciation and amortization expense was 5.87% higher in 2Q13, at R$ 184mn, compared to R$ 174mn in 2Q12.

Operational provisions

The expense on operational provisions in 1Q13 was R$ 71mn, compared to a reversal of provisioning expense of R$ 23mn in 1Q12. This mainly reflects constitution of a provision on June 30, 2013 for a regulatory action on the subject of electricity distribution service quality indicators, in the amount of R$ 19mn, and increased provisions for employment-law litigation, due to the higher volume of this type of action in the period. The reversal in 2Q12 was for re-assessment of the probabilities of

58

Table of Contents

losses in various legal actions dealing with consumer relations, based on the opinion of the Company’s legal advisors.

Outsourced services

Expenses on outsourced services in 2Q13 were R$ 249mn, 2.36% higher than in 2Q12 (R$ 199mn). The main changes were in (i) maintenance, conservation and cleaning services; (ii) higher volume of services related to billing and collection of receivables, primarily meter readers and bill delivery, and (iii) the reimbursable expenses relating to the review of the Asset Control Manual (Manual de Controle Patrimonial — MCPSE). The latter are now no longer posted as a financial asset, but as a regulatory asset, hence not recognized by IFRS — and as a result the impact of this is perceived in the Net income and loss account.

Gain on the transfers of the Shares in TBE

The Company recorded a net gain of R$ 284 million in 2Q13 as a result of disposal of its investment in the TBE group, when the whole of the interest in the TBE group held by Cemig GT was transferred to Taesa, on May 31, 2013.

Financial Revenues and Expenses

Cemig posted net financial expenses in 2Q13 of R$ 152mn, compared to net financial expenses of R$ 182mn in 2Q12. The main factors are:

·                  Revenue from cash investments 35.19% higher due to the higher volume of cash invested.

59

Table of Contents

·                  Expenses on loans and financings 19.87% lower, at R$ 159mn, in 2Q13, vs. R$ 198mn in 2Q12. This is basically because the accumulated CDI rate in 2Q13, at 1.79%, was lower than in 2Q12 (when it was 2.09%).

·                  Expense on monetary updating of loans and financing 31.80% higher, at R$ 58 mn, in 2Q13 than in 2Q12 (R$ 44mn). This mainly reflects a higher volume of financings raised in 2013.

·                  Charges for late payment on electricity invoices 29.61% higher, at R$ 49mn in 2Q13, compared to R$ 38mn in 2Q12, mainly reflecting a Debt Recognition Agreement acknowledging non-payment of Charges for Use of the Distribution System, for the period April 2003 to December 2004.

·                  Expenses on updating of Accounts Receivable from the Minas Gerais State Government, in the amount of R$ 34,732 in 2Q12. In 2013 there was no revenue under this line since the whole of the balance of Accounts Receivable from the State Government had been paid in full in 1Q13.

Income tax and Social Contribution tax

In 2Q13, Cemig posted expenses on income tax and the Social Contribution tax of R$ 299.4mn, representing a rate of 32.67% on the pre-tax net income of R$ 916.7mn.

In 2Q12, Cemig’s expenses on income tax and the Social Contribution tax were R$ 254.3mn, equal to 29.62% of the pre-tax net income of R$ 858.6mn.

60

Table of Contents

EBITDA

Cemig’s consolidated Ebitda in 2Q13 was 3.13% higher than in 2Q12:

Consolidated Ebitda was slightly (3.13%) higher in 2Q13 than 2Q12, reflecting revenue 10.39% higher, partially offset by operational costs and expenses (excluding depreciation and amortization) 10.10% higher.

The higher Ebitda, year-on-year, of Cemig D in 2Q13 — up 5.12% from 2Q12 — mainly reflects operational costs and expenses (excluding amortization) 4.49% lower, and net

61

Table of Contents

revenue 15.47% higher, partially offset by operational costs and expenses (excluding the effects of depreciation and amortization) 7.24% higher.

The effect on consolidated Ebitda of the higher contribution from Cemig D was slightly compensated by revenue in Cemig GT 2.97% lower year-on-year, and also by its Ebitda 37.27% lower — which mainly reflected operational costs and expenses 63.38% higher (excluding depreciation and amortization).

DEBT

Cemig’s total debt on June 30, 2013 was R$ 9.46 billion, equal to 76.30% of consolidated stockholders’ equity. Cemig’s consolidated Stockholders’ equity on June 30, 2013 was R$ 12.41 billion, 15.43% lower than on December 31, 2012 and equivalent to book value per share of R$ 12.89 per share.

62

Table of Contents

63

Table of Contents

ACQUISITIONS

TBE — TAESA

The process of stockholding restructuring of Taesa was completed on May 31, 2013, with transfer to Taesa (Transmissora Aliança de Energia Elétrica S.A.) of the equity interests held by Cemig GT in EBTE (49%), and in the transmission companies of the TBE Group:  ETEP (49.98%), ENTE (49.99%), ERTE (49.99%), EATE (49.98%) and ECTE (19.09%). The transaction included disbursement by Taesa of R$ 1.907 billion. The sale resulted in a net gain for Cemig of R$ 107mn.

BRASIL PCH

On July 14th, 2013 Cemig concluded acquisition of 49% of Brasil PCH, currently considered to be one of the leading independent companies generating electricity from renewable sources.

Brasil PCH owns 13 Small Hydroelectric Plants (Pequenos Centrais Hidrelétricas, or PCHs), operating in the states of Minas Gerais, Rio de Janeiro, Espírito Santo and Goiânia, totaling 291MW of installed generating capacity with assured power of 194 average MW.

A total of R$ 650mn was invested in the transaction. All the electricity to be produced by the project has been sold to Eletrobras (Centrais Elétricas Brasileiras S.A.), in contracts under the Program to Stimulate Alternative Energy Sources (Programa de Incentivo às Fontes Alternativas de Energia Elétrica, or Proinfa).

The acquisition is part of the strategy contained in Cemig’s Long-term Strategic Plan: sustainable growth, through transactions that can add value to its present assets, and which provide stockholders with an appropriate and attractive return on their investments.

64

Table of Contents

A Material Announcement published on August 8, 2013 reported the Company’s decision on that date to enter into an investment agreement governing a capital increase in Renova, with Cemig entering the controlling stockholding block of that company. The agreement provides for Chipley to become a vehicle of acquisitions for Cemig GT and Renova, with the share purchase agreement between Cemig GT and Petrobras (Petróleo Brasileiro S.A.) being assigned to it. For more information, see the material announcement, in this link:

http://cemig.infoinvest.com.br/enu/10796/CEMIG_FatoRelevante_RenovaeBrasilPCH_08.08.2013_final_ing.pdf

65

Table of Contents

RENEWAL OF CONCESSIONS

The Brazilian government’s Law 12783, successor to Provisional Measure 579 (“PM 579”), aimed to close the debate on whether the electricity concessions referred to by Articles 17, §5, 19 and 22 of Law 9074, of July 7, 1995 could be extended.

Cemig opted not to renew the concessions of 18 hydroelectric plants. For the concessions of the Jaguara, São Simão and Miranda plants, whose current concession periods complete in August 2013, January 2015 and December 2016, respectively, the company believes it has the right to extension on the terms existing prior to the Provisional Measure, under clauses in the concession contracts themselves and in Article 19 of Law 907/1995.

On June 20, 2013, Cemig GT (Cemig Geração e Transmissão) obtained an interim injunction in its application for an order of mandamus before the Higher Appeal Court, against the decision of the Mining and Energy Ministry not to entertain the application for extension of the period of concession of the Jaguara hydroelectric plant. The interim remedy given by Reporting Justice Sérgio Kukina ensures that the Company will continue to operate Jaguara until final judgment in the action.

DIVIDENDS

Cemig’s distribution of dividends is as follows: 50% of net net income is distributed to stockholders as the obligatory dividend, subject to the other provisions in its by-laws and the applicable legislation; the balance, after any retentions specified in a capital or investment budget specified by management, subject to the Long-term Strategic Plan and the investment policy specified in it and duly approved, is paid into a net income reserve, held for the purpose of distribution of extraordinary dividends, up to the limit specified by law.

66

Table of Contents

Independently of the obligatory dividend, every two years Cemig will use this net income reserve to distribute extraordinary dividends, up to the limit of cash available.

The Board of Directors may declare interim dividends, in the form of Interest on Equity, on account of retained earnings, or on account of net income reserves, or of net incomes reported in six-monthly or interim financial statements.

This table shows our distribution of dividends and Interest on Equity to stockholders over the last five years:

Our dividend yield has been growing significantly in the last five years, providing an increasing rate of return each year to the stockholder.

67

Table of Contents

Light — Highlights of 2Q 2013

·                  Net income increases by 46.2% in the quarter

·                  Total energy consumption in 2Q13 was 2.5% higher than in 2Q12, totaling 5,897 GWh;

·                  In the quarter, consolidated net revenue, excluding revenue from construction, came to R$1,670.9 million, 2.6% up on 2Q12;

·                  Consolidated EBITDA amounted to R$277.9 million in 2Q13, 8.9% up on 2Q12. Adjusted EBITDA, which includes regulatory assets and liabilities (CVA), came to R$397.2 million in 2Q13, 20.1% up year-on-year;

·                  Net income totaled R$58.2 million, 46.2% more than in 2Q12;

·                  Non-technical energy losses in the last 12 months closed the quarter at 44.2% of billed energy in the low-voltage market (ANEEL criterion), 120 bps down on December 2012.

·            The Company closed 2Q13 with net debt of R$4,056.1 million, in line with March 2013. The net debt/EBITDA ratio stood at 2.62x;

·                  On 08/08/2013, the Company’s wholly-owned subsidiary LIGHT ENERGIA S.A. (“Light Energia”) approved the signature, on this date, of an investment agreement entered into with RR PARTICIPAÇÕES S.A. (“RR”), Cemig GT, RENOVA ENERGIA S.A. (“Renova”) and CHIPLEY SP PARTICIPAÇÕES S.A., whose objective is to regulate the entry of Cemig GT in Renova’s controlling group, as well as to structure Chipley as a growth vehicle, with equity interest of Cemig GT and Renova, for which the Share Purchase Agreement of Brasil PCH S.A. (CCVA Brasil PCH), entered into between CEMIG GT and Petróleo Brasileiro S.A. — Petrobras, on June 14, 2013, will be granted.

Please see:

http://ri.light.com.br/enu/3608/Press_Release_2T13_caudit_limpa_MZT_eng_rev_2_.pdf

68

Table of Contents

Financial Statements Separated by Company

FINANCIAL STATEMENTS SEPARATED BY COMPANY — JUNE 30, 2013