XML 185 R164.htm IDEA: XBRL DOCUMENT
v3.21.1

23. REGULATORY CHARGES (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Liabilities |  |  |
Global Reversion Reserve (RGR) | R$ 28 | R$ 31 |
Energy Development Account (CDE) | 64 | 58 |
Grantor inspection fee - ANEEL | 3 | 3 |
Energy Efficiency Program | 265 | 255 |
Research and development (R&D) | 225 | 199 |
Energy System Expansion Research | 4 | 3 |
National Scientific and Technological Development Fund | 8 | 6 |
Proinfa - Alternative Energy Program | 7 | 8 |
Royalties for use of water resources | 13 | 10 |
Emergency capacity charge | 26 | 26 |
Customer charges - Tariff flags | 90 |  |
Others | 4 | 5 |
Liability | 737 | 604 |
Current liabilities | 446 | 457 | [1]
Non-current liabilities | R$ 291 | R$ 147 | [1]
[1] | See note 2.8.

X
- Definition Aneel inspection charge. + References No definition available. + Details
Name: | cig_AneelInspectionCharge
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Current regulatory liability. + References No definition available. + Details
Name: | cig_CurrentRegulatoryLiability
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Customer charges &amp;#8211; Tariff flags. + References No definition available. + Details
Name: | cig_CustomerChargesTariffFlags
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Emergency capacity charge. + References No definition available. + Details
Name: | cig_EmergencyCapacityCharge
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Energy development account. + References No definition available. + Details
Name: | cig_EnergyDevelopmentAccount
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Energy efficiency program. + References No definition available. + Details
Name: | cig_EnergyEfficiencyProgram
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Energy system expansion research. + References No definition available. + Details
Name: | cig_EnergySystemExpansionResearch
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Global reversion reserve. + References No definition available. + Details
Name: | cig_GlobalReversionReserve
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition National scientific and technological development fund. + References No definition available. + Details
Name: | cig_NationalScientificAndTechnologicalDevelopmentFund
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Noncurrent regulatory liability. + References No definition available. + Details
Name: | cig_NoncurrentRegulatoryLiability
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Other current regulatory liability. + References No definition available. + Details
Name: | cig_OtherCurrentRegulatoryLiability
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Proinfa alternative energy program. + References No definition available. + Details
Name: | cig_ProinfaAlternativeEnergyProgram
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Royalties for use of water resources. + References No definition available. + Details
Name: | cig_RoyaltiesForUseOfWaterResources
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of regulatory deferral account credit balances and the related deferred tax liability. [Refer: Regulatory deferral account credit balances; Deferred tax liability associated with regulatory deferral account balances] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 14 -IssueDate 2020-01-01 -Paragraph 24 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=14&code=ifrs-tx-2020-en-r&anchor=para_24&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 14 -IssueDate 2020-01-01 -Paragraph B11 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=14&code=ifrs-tx-2020-en-r&anchor=para_B11_a&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
Name: | ifrs-full_RegulatoryDeferralAccountCreditBalancesAndRelatedDeferredTaxLiability
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | ifrs-full_RegulatoryDeferralAccountCreditBalancesAndRelatedDeferredTaxLiabilityAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of expenditure directly attributable to research or development activities, recognised in profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 126 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_126&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ResearchAndDevelopmentExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration