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Equity and Remuneration to Shareholders (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Share Capital for Common Shares and Preferred Shares | The Company’s issued and outstanding share capital on December 31, 2017, 2016 and 2015 is R$ 6,294, represented by 420,764,708 common shares and 838,076,946 preferred shares, all with nominal value of R$ 5.00 (five Reais), as follows:
Shareholders |  | Number of shares on December 31, 2017 |
| Common |  |  | % |  |  | Preferred |  |  | % |  |  | Total |  |  | % |
State of Minas Gerais |  |  | 214,414,739 |  |  |  | 51 |  |  |  | — |  |  |  | — |  |  |  | 214,414,739 |  |  |  | 17 |
Other entities of Minas Gerais State |  |  | 56,703 |  |  |  | — |  |  |  | 4,860,228 |  |  |  | 1 |  |  |  | 4,916,931 |  |  |  | 1 |
FIA Dinâmica Energia S.A. |  |  | 41,635,754 |  |  |  | 10 |  |  |  | 62,469,590 |  |  |  | 7 |  |  |  | 104,105,344 |  |  |  | 8 |
Others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Brazil |  |  | 110,343,209 |  |  |  | 26 |  |  |  | 237,174,007 |  |  |  | 28 |  |  |  | 347,517,216 |  |  |  | 27 |
Foreign shareholders |  |  | 54,314,303 |  |  |  | 13 |  |  |  | 533,573,121 |  |  |  | 64 |  |  |  | 587,887,424 |  |  |  | 47 |
Total |  |  | 420,764,708 |  |  |  | 100 |  |  |  | 838,076,946 |  |  |  | 100 |  |  |  | 1,258,841,654 |  |  |  | 100 |
Shareholders |  | Number of shares on December 31, 2016 |
| Common |  |  | % |  |  | Preferred |  |  | % |  |  | Total |  |  | % |
State of Minas Gerais |  |  | 214,414,739 |  |  |  | 51 |  |  |  | — |  |  |  | — |  |  |  | 214,414,739 |  |  |  | 17 |
Other entities of Minas Gerais State |  |  | 56,703 |  |  |  | — |  |  |  | 4,860,228 |  |  |  | 1 |  |  |  | 4,916,931 |  |  |  | 1 |
AGC Energia S.A. |  |  | 84,357,856 |  |  |  | 20 |  |  |  | — |  |  |  | — |  |  |  | 84,357,856 |  |  |  | 7 |
Other |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
In Brazil |  |  | 112,584,011 |  |  |  | 27 |  |  |  | 252,478,755 |  |  |  | 30 |  |  |  | 365,062,766 |  |  |  | 28 |
Foreign shareholders |  |  | 9,351,399 |  |  |  | 2 |  |  |  | 580,737,963 |  |  |  | 69 |  |  |  | 590,089,362 |  |  |  | 47 |
Total |  |  | 420,764,708 |  |  |  | 100 |  |  |  | 838,076,946 |  |  |  | 100 |  |  |  | 1,258,841,654 |  |  |  | 100 |
Shareholders |  | Number of shares on December 31, 2015 |
| Common |  |  | % |  |  | Preferred |  |  | % |  |  | Total |  |  | % |
Minas Gerais State |  |  | 214,414,739 |  |  |  | 51 |  |  |  | — |  |  |  | — |  |  |  | 214,414,739 |  |  |  | 17 |
Other entities of M.G. State |  |  | 56,703 |  |  |  | — |  |  |  | 10,418,812 |  |  |  | 1 |  |  |  | 10,475,515 |  |  |  | 1 |
AGC Energia S.A. |  |  | 138,700,848 |  |  |  | 33 |  |  |  | 42,671,763 |  |  |  | 5 |  |  |  | 181,372,611 |  |  |  | 15 |
Others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Brazil |  |  | 58,127,167 |  |  |  | 14 |  |  |  | 179,358,041 |  |  |  | 21 |  |  |  | 237,485,208 |  |  |  | 18 |
Foreign shareholders |  |  | 9,465,251 |  |  |  | 2 |  |  |  | 605,628,330 |  |  |  | 73 |  |  |  | 615,093,581 |  |  |  | 49 |
Total |  |  | 420,764,708 |  |  |  | 100 |  |  |  | 838,076,946 |  |  |  | 100 |  |  |  | 1,258,841,654 |  |  |  | 100 |
Summary of Shares used in Calculation of Basic Profit and Diluted Earnings per Share | In view of the capital increase described in more detail in subclause ‘e’ of this explanatory note, the calculation of the basic and diluted earnings taking into account the new shares that will potentially be subscribed, as follows:
Number of shares |  | 2017 |  |  | 2016 |  |  | 2015 |
Common shares already paid up |  |  | 420,764,708 |  |  |  | 420,764,708 |  |  |  | 420,764,708 |
Common shares to be paid up |  |  | 66,849,505 |  |  |  | — |  |  |  | — |
Shares in treasury |  |  | (69 | ) |  |  | (69 | ) |  |  | (69 | )
|  |  | 487,614,144 |  |  |  | 420,764,639 |  |  |  | 420,764,639 |
Preferred shares already paid up |  |  | 838,076,946 |  |  |  | 838,076,946 |  |  |  | 838,076,946 |
Preferred shares to be paid up |  |  | 133,061,442 |  |  |  | — |  |  |  | — |
Shares in treasury |  |  | (560,649 | ) |  |  | (560,649 | ) |  |  | (560,649 | )
|  |  | 970,577,739 |  |  |  | 837,516,297 |  |  |  | 837,516,297 |
Total |  |  | 1,458,191,883 |  |  |  | 1,258,280,936 |  |  |  | 1,258,280,936 |
Summary of Calculation of Basic Earnings per Share | The calculation of basic earnings per share is as follows:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Net income for the year |  |  | 1,001 |  |  |  | 334 |  |  |  | 2,469 |
Minimum mandatory dividend for preferred shares from income for the period (item c) |  |  | 486 |  |  |  | 204 |  |  |  | 422 |
Income not distributed arising from the net income for the year – preferred shares |  |  | 333 |  |  |  | 87 |  |  |  | 1,221 |
Total of the earnings for the preferred shares (A) |  |  | 819 |  |  |  | 291 |  |  |  | 1,643 |
Minimum mandatory dividend for the common shares |  |  | 15 |  |  |  | — |  |  |  | 212 |
Income not distributed arising from the net income for the period – common shares |  |  | 167 |  |  |  | 44 |  |  |  | 614 |
Total earnings for the common shares (B) |  |  | 182 |  |  |  | 44 |  |  |  | 826 |
Basic earnings per preferred share ( A / number of preferred shares ) |  |  | 0.84 |  |  |  | 0.35 |  |  |  | 1.96 |
Basic earnings per common share ( B / number of common shares ) |  |  | 0.37 |  |  |  | 0.10 |  |  |  | 1.96 |
Summary of Calculation of Diluted Earnings per Share | The following shows the calculation of diluted profit per share:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Net income for the year |  |  | 1,001 |  |  |  | 334 |  |  |  | 2,469 |
Total basic earnings for the preferred shares |  |  | 819 |  |  |  | 291 |  |  |  | 1,643 |
Dilution effect related to the RME/Lepsa Option |  |  | — |  |  |  | (22 | ) |  |  | — |
Dilution effect related to the Ativas Option |  |  | — |  |  |  | (5 | ) |  |  | — |
Diluted earnings for the preferred shares (C) |  |  | 819 |  |  |  | 264 |  |  |  | 1,643 |
Total earnings for the year for the common shares |  |  | 182 |  |  |  | 43 |  |  |  | 826 |
Dilution effect related to the RME/Lepsa Option |  |  | — |  |  |  | (11 | ) |  |  | — |
Dilution effect related to the Ativas Option |  |  | — |  |  |  | (2 | ) |  |  | — |
Diluted earnings for the common shares (D) |  |  | 182 |  |  |  | 30 |  |  |  | 826 |
Diluted earnings per preferred share ( C / No. of preferred shares ) |  |  | 0.84 |  |  |  | 0.32 |  |  |  | 1.96 |
Diluted earnings per common share ( D / No. of common shares ) |  |  | 0.37 |  |  |  | 0.07 |  |  |  | 1.96 |
Schedule of Capital Reserves and Profit Reserves | Capital reserves and Profit reserves are made up as follows:
Capital reserves and shares in Treasury |  | 2017 |  |  | 2016 |  |  | 2015 |
Investment-related subsidies |  |  | 1,857 |  |  |  | 1,857 |  |  |  | 1,857 |
Goodwill on issuance of shares |  |  | 69 |  |  |  | 69 |  |  |  | 69 |
Shares in treasury |  |  | (1 | ) |  |  | (1 | ) |  |  | (1 | )
|  |  | 1,925 |  |  |  | 1,925 |  |  |  | 1,925 |
The Reserve for investment-related donations and subsidies basically refers to the compensation by the federal government for the difference between the profitability obtained by Cemig up to March 1993 and the minimum return guaranteed by the legislation in effect at the time. The reserve for treasury shares refers to the pass-through by Finor of shares arising from funds applied in Cemig projects in the area covered by Sudene (the development agency for the Northeast) under tax incentive programs.
Profit reserves |  | 2017 |  |  | 2016 |  |  | 2015 |
Legal reserve |  |  | 853 |  |  |  | 853 |  |  |  | 853 |
Statutory Reserve |  |  | 57 |  |  |  | 57 |  |  |  | 57 |
Retained Earnings reserve |  |  | 3,341 |  |  |  | 2,813 |  |  |  | 2,906 |
Incentives tax reserve |  |  | 58 |  |  |  | 57 |  |  |  | 50 |
Reserve for mandatory dividends not distributed |  |  | 1,420 |  |  |  | 1,420 |  |  |  | 797 |
|  |  | 5,729 |  |  |  | 5,200 |  |  |  | 4,663 |
Summary of Reserve for Obligatory Dividends Not Distributed | Reserve for mandatory dividends not distributed
|  | 2017 |
Dividends withheld, arising from the net income of 2015 |  |  | 623 |
Dividends withheld, arising from the net income of 2014 |  |  | 797 |
|  |  | 1,420 |
Schedule of Dividends Proposed for Distribution to Shareholders Based on the Profit for the Business Year | The calculation of the minimum dividends proposed for distribution to Shareholders as a result of the 2017, as mentioned in the previous paragraph, is as follows:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Calculation of Minimum Dividends required by the By-laws for the preferred shares |  |  |  |  |  |  |  |  |  |  |  |
Nominal value of the preferred shares |  |  | 4,191 |  |  |  | 4,190 |  |  |  | 4,190 |
Nominal value of the preferred shares to be capitalized |  |  | 665 |  |  |  | — |  |  |  | — |
|  |  | 4,856 |  |  |  | 4,190 |  |  |  | 4,190 |
Percentage applied to the nominal value of the preferred shares |  |  | 10.00 | % |  |  | 10.00 | % |  |  | 10.00 | %
Amount of the dividends by the First payment criterion |  |  | 486 |  |  |  | 419 |  |  |  | 419 |
Equity |  |  | 14,326 |  |  |  | 12,930 |  |  |  | 12,984 |
Preferred shares as a percentage of Equity (net of shares held in Treasury) |  |  | 66.58 | % |  |  | 66.58 | % |  |  | 66.58 | %
Portion of Equity represented by the preferred shares |  |  | 9,538 |  |  |  | 8,609 |  |  |  | 8,645 |
Percentage applied to the portion of Equity represented by the preferred shares |  |  | 3.00 | % |  |  | 3.00 | % |  |  | 3.00 | %
Amount of the dividends by the Second payment criterion |  |  | 286 |  |  |  | 258 |  |  |  | 259 |
Minimum Dividends required by the Bylaws for the preferred shares |  |  | 486 |  |  |  | 419 |  |  |  | 419 |
Calculation of the Minimum Dividend under the by-laws based on the net income for the period |  |  |  |  |  |  |  |  |  |  |  |
Mandatory dividend |  |  |  |  |  |  |  |  |  |  |  |
Net income for the year |  |  | 1,001 |  |  |  | 334 |  |  |  | 2,469 |
Mandatory dividends – 50% of Net income |  |  | 500 |  |  |  | 167 |  |  |  | 1,235 |
Summary of Equity Valuation Adjustments |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Deemed cost of PP&E |  |  | 639 |  |  |  | 685 |  |  |  | 720 |
Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Variation in fair value of financial asset available for sale in jointly-controlled entity |  |  | — |  |  |  | 37 |  |  |  | 18 |
Cumulative translation adjustments |  |  | — |  |  |  | — |  |  |  | 63 |
Adjustments to actuarial liabilities – Employee benefits |  |  | (1,476 | ) |  |  | (1,211 | ) |  |  | (699 | )
Equity valuation adjustments |  |  | (837 | ) |  |  | (489 | ) |  |  | 102 |

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