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Regulatory Charges - Disclosure of Information About Amounts Recognised in Relation to Regulatory Deferral Account Balances (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Assets |  |
Receivable from Eletrobras | R$ 4 | R$ 138
Liabilities |  |
Energy Development Account (CDE) | 206 | 189
Aneel inspection charge | 2 | 3
Energy Efficiency | 224 | 288
Research and development | 233 | 234
Energy System Expansion Research | 3 | 3
National Scientific and Technological Development Fund | 5 | 5
Proinfa - Alternative Energy Program | 7 | 8
Royalties for use of water resources | 15 | 23
Emergency capacity charge | 31 | 31
Customer charges - 'Tariff Flag' amounts |  | 17
Liability | 763 | 836
Current liabilities | 513 | 381
Non-current liabilities | 250 | 455
Receivable from Eletrobras - RGR [member] |  |
Assets |  |
Receivable from Eletrobras |  | 48
Receivable from Eletrobras - CDE [member] |  |
Assets |  |
Receivable from Eletrobras | 4 | 90
Regulatory Assets [member] |  |
Liabilities |  |
Global Reversion Reserve (RGR) | R$ 37 | R$ 35

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- 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 2017-01-01 -Paragraph 24 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=14&date=2017-03-01&anchor=para_24&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 14 -IssueDate 2017-01-01 -Paragraph B11 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=14&date=2017-03-01&anchor=para_B11_a&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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- 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 2017-01-01 -Paragraph 126 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_126&doctype=Standard -URIDate 2017-03-09 + Details
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