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31. Net Operating Revenue (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues R$ 23,725,810 R$ 21,574,289 R$ 21,061,792
PIS/Pasep and Cofins (2,117,800) (1,788,714) (1,801,359)
ICMS (VAT) (4,210,382) (3,734,940) (4,131,780)
Regulatory charges (2,457,562) (2,020,674) (2,022,232)
Service tax (ISSQN) (5,286) (5,388) (4,668)
Net operating revenues 14,934,780 14,024,573 13,101,753
Electricity sales to final customers      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 10,104,045 8,689,516 9,606,133
PIS/Pasep and Cofins (931,771) (749,683) (884,681)
ICMS (VAT) (2,315,030) (2,039,245) (2,426,940)
Regulatory charges (1,308,660) (1,219,055) (1,063,007)
Service tax (ISSQN) 0 0 0
Net operating revenues 5,548,584 4,681,533 5,231,505
Electricity sales to final customers | Residential      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 3,262,212 2,829,626 2,841,218
PIS/Pasep and Cofins (301,885) (242,916) (298,659)
ICMS (VAT) (892,053) (771,902) (790,401)
Regulatory charges (471,575) (433,080) (380,973)
Service tax (ISSQN) 0 0 0
Net operating revenues 1,596,699 1,381,728 1,371,185
Electricity sales to final customers | Industrial      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 2,863,086 2,382,314 3,029,411
PIS/Pasep and Cofins (261,692) (208,226) (273,901)
ICMS (VAT) (486,614) (433,088) (674,630)
Regulatory charges (260,416) (252,531) (284,922)
Service tax (ISSQN) 0 0 0
Net operating revenues 1,854,364 1,488,469 1,795,958
Electricity sales to final customers | Trade, services and other activities      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 2,172,540 1,908,426 2,130,228
PIS/Pasep and Cofins (201,047) (163,834) (194,630)
ICMS (VAT) (625,123) (548,328) (622,946)
Regulatory charges (313,744) (291,798) (247,449)
Service tax (ISSQN) 0 0 0
Net operating revenues 1,032,626 904,466 1,065,203
Electricity sales to final customers | Rural      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 897,606 772,465 815,079
PIS/Pasep and Cofins (83,064) (66,314) (48,216)
ICMS (VAT) (71,665) (75,137) (120,854)
Regulatory charges (131,494) (119,645) (61,557)
Service tax (ISSQN) 0 0 0
Net operating revenues 611,383 511,369 584,452
Electricity sales to final customers | Public entities      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 263,827 236,719 236,550
PIS/Pasep and Cofins (24,415) (20,322) (21,881)
ICMS (VAT) (52,208) (46,506) (48,148)
Regulatory charges (38,337) (36,418) (27,986)
Service tax (ISSQN) 0 0 0
Net operating revenues 148,867 133,473 138,535
Electricity sales to final customers | Public lighting      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 279,767 244,381 229,182
PIS/Pasep and Cofins (25,890) (20,979) (21,199)
ICMS (VAT) (80,768) (70,811) (66,481)
Regulatory charges (40,399) (37,359) (26,962)
Service tax (ISSQN) 0 0 0
Net operating revenues 132,710 115,232 114,540
Electricity sales to final customers | Public service      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 365,007 315,585 324,465
PIS/Pasep and Cofins (33,778) (27,092) (26,195)
ICMS (VAT) (106,599) (93,473) (103,480)
Regulatory charges (52,695) (48,224) (33,155)
Service tax (ISSQN) 0 0 0
Net operating revenues 171,935 146,796 161,635
Electricity sales to distributors      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 3,136,244 3,529,770 2,963,349
PIS/Pasep and Cofins (318,368) (300,003) (239,531)
ICMS (VAT) 0 0 0
Regulatory charges (51,960) (53,413) (47,746)
Service tax (ISSQN) 0 0 0
Net operating revenues 2,765,916 3,176,354 2,676,072
Electricity sales to distributors | Bilateral contracts      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 2,002,077 1,947,862 1,366,552
PIS/Pasep and Cofins (242,828) (203,994) (134,439)
ICMS (VAT) 0 0 0
Regulatory charges (34,759) (30,656) (23,361)
Service tax (ISSQN) 0 0 0
Net operating revenues 1,724,490 1,713,212 1,208,752
Electricity sales to distributors | Electric Energy Trade Chamber - CCEE      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 663,024 1,077,943 753,392
PIS/Pasep and Cofins (23,448) (45,889) (23,116)
ICMS (VAT) 0 0 0
Regulatory charges (11,511) (16,966) (12,879)
Service tax (ISSQN) 0 0 0
Net operating revenues 628,065 1,015,088 717,397
Electricity sales to distributors | CCEAR (auction)      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 327,759 367,970 673,154
PIS/Pasep and Cofins (39,753) (38,537) (66,223)
ICMS (VAT) 0 0 0
Regulatory charges (5,690) (5,791) (11,508)
Service tax (ISSQN) 0 0 0
Net operating revenues 282,316 323,642 595,423
Electricity sales to distributors | Interest      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 85,986 82,160 96,783
PIS/Pasep and Cofins 0 0 0
ICMS (VAT) 0 0 0
Regulatory charges 0 0 0
Service tax (ISSQN) 0 0 0
Net operating revenues 85,986 82,160 96,783
Electricity sales to distributors | Quota system      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 57,398 53,835 73,468
PIS/Pasep and Cofins (12,339) (11,583) (15,753)
ICMS (VAT) 0 0 0
Regulatory charges 0 0 0
Service tax (ISSQN) 0 0 0
Net operating revenues 45,059 42,252 57,715
Use of the main distribution and transmission grid      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 6,867,274 6,442,761 6,974,829
PIS/Pasep and Cofins (657,679) (588,291) (575,166)
ICMS (VAT) (1,643,593) (1,488,323) (1,511,601)
Regulatory charges (1,096,942) (748,206) (911,479)
Service tax (ISSQN) 0 0 0
Net operating revenues 3,469,060 3,617,941 3,976,583
Use of the main distribution and transmission grid | Residential      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 2,222,621 2,025,400 2,060,305
PIS/Pasep and Cofins (209,406) (189,915) (192,823)
ICMS (VAT) (624,777) (572,269) (584,025)
Regulatory charges (371,351) (252,690) (306,096)
Service tax (ISSQN) 0 0 0
Net operating revenues 1,017,087 1,010,526 977,361
Use of the main distribution and transmission grid | Industrial      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 1,179,534 1,076,613 1,246,575
PIS/Pasep and Cofins (104,588) (96,059) (112,443)
ICMS (VAT) (436,421) (385,725) (391,804)
Regulatory charges (184,179) (126,842) (177,993)
Service tax (ISSQN) 0 0 0
Net operating revenues 454,346 467,987 564,335
Use of the main distribution and transmission grid | Trade, services and other activities      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 1,416,111 1,310,903 1,409,771
PIS/Pasep and Cofins (132,444) (122,168) (131,352)
ICMS (VAT) (425,030) (386,320) (402,233)
Regulatory charges (234,558) (162,367) (208,471)
Service tax (ISSQN) 0 0 0
Net operating revenues 624,079 640,048 667,715
Use of the main distribution and transmission grid | Rural      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 363,296 342,195 339,438
PIS/Pasep and Cofins (34,180) (32,056) (31,752)
ICMS (VAT) (28,206) (25,811) (15,451)
Regulatory charges (61,378) (43,365) (51,196)
Service tax (ISSQN) 0 0 0
Net operating revenues 239,532 240,963 241,039
Use of the main distribution and transmission grid | Public entities      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 185,383 174,427 168,823
PIS/Pasep and Cofins (17,466) (16,355) (15,800)
ICMS (VAT) (35,497) (33,384) (33,369)
Regulatory charges (31,146) (21,922) (25,224)
Service tax (ISSQN) 0 0 0
Net operating revenues 101,274 102,766 94,430
Use of the main distribution and transmission grid | Public lighting      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 184,530 167,907 167,255
PIS/Pasep and Cofins (17,386) (15,744) (15,653)
ICMS (VAT) (53,502) (48,668) (48,489)
Regulatory charges (30,814) (20,935) (24,839)
Service tax (ISSQN) 0 0 0
Net operating revenues 82,828 82,560 78,274
Use of the main distribution and transmission grid | Public service      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 141,556 126,795 125,928
PIS/Pasep and Cofins (13,337) (11,889) (11,786)
ICMS (VAT) (40,160) (36,146) (36,230)
Regulatory charges (23,647) (15,816) (18,703)
Service tax (ISSQN) 0 0 0
Net operating revenues 64,412 62,944 59,209
Use of the main distribution and transmission grid | Free consumers      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 795,105 663,248 398,024
PIS/Pasep and Cofins (74,912) (62,190) (37,251)
ICMS (VAT) 0 0 0
Regulatory charges (135,166) (84,633) (60,242)
Service tax (ISSQN) 0 0 0
Net operating revenues 585,027 516,425 300,531
Use of the main distribution and transmission grid | Basic network, BN connections, and connection grid      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 1,411 1,387 1,494
PIS/Pasep and Cofins (133) (130) (140)
ICMS (VAT) 0 0 0
Regulatory charges (240) (177) (226)
Service tax (ISSQN) 0 0 0
Net operating revenues 1,038 1,080 1,128
Use of the main distribution and transmission grid | Operating and maintenance income - O&M      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 58,578 113,324 151,984
PIS/Pasep and Cofins (25,526) (16,733) (5,456)
ICMS (VAT) 0 0 0
Regulatory charges (11,536) (7,793) (8,026)
Service tax (ISSQN) 0 0 0
Net operating revenues 21,516 88,798 138,502
Use of the main distribution and transmission grid | Interest income      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 319,149 440,562 905,232
PIS/Pasep and Cofins (28,301) (25,051) (20,710)
ICMS (VAT) 0 0 0
Regulatory charges (12,927) (11,666) (30,461)
Service tax (ISSQN) 0 0 0
Net operating revenues 277,921 403,845 854,061
Construction income      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 1,097,313 868,001 1,279,642
PIS/Pasep and Cofins 0 0 0
ICMS (VAT) 0 0 0
Regulatory charges 0 0 0
Service tax (ISSQN) 0 0 0
Net operating revenues 1,097,313 868,001 1,279,642
Fair value of assets from the indemnity for the concession      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 47,499 57,080 132,741
PIS/Pasep and Cofins 0 0 0
ICMS (VAT) 0 0 0
Regulatory charges 0 0 0
Service tax (ISSQN) 0 0 0
Net operating revenues 47,499 57,080 132,741
Telecommunications      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 512,540 426,773 357,361
PIS/Pasep and Cofins (19,248) (15,854) (13,872)
ICMS (VAT) (125,229) (99,460) (79,582)
Regulatory charges 0 0 0
Service tax (ISSQN) (1,884) (2,507) (2,326)
Net operating revenues 366,179 308,952 261,581
Distribution of piped gas      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 753,222 621,992 647,579
PIS/Pasep and Cofins (69,382) (58,959) (62,037)
ICMS (VAT) (126,530) (107,912) (113,657)
Regulatory charges 0 0 0
Service tax (ISSQN) (124) (306) 0
Net operating revenues 557,186 454,815 471,885
Sectorial financial assets and liabilities result      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 985,344 767,040 (1,079,662)
PIS/Pasep and Cofins (91,656) (48,214) 0
ICMS (VAT) 0 0 0
Regulatory charges 0 0 0
Service tax (ISSQN) 0 0 0
Net operating revenues 893,688 718,826 (1,079,662)
Other operating revenue      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 222,329 171,356 179,820
PIS/Pasep and Cofins (29,696) (27,710) (26,072)
ICMS (VAT) 0 0 0
Regulatory charges 0 0 0
Service tax (ISSQN) (3,278) (2,575) (2,342)
Net operating revenues 189,355 141,071 151,406
Other operating revenue | Leasing and rent      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 132,682 109,230 103,793
PIS/Pasep and Cofins (17,722) (17,664) (15,049)
ICMS (VAT) 0 0 0
Regulatory charges 0 0 0
Service tax (ISSQN) 0 0 0
Net operating revenues 114,960 91,566 88,744
Other operating revenue | Income from rendering of services      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 59,280 30,247 32,575
PIS/Pasep and Cofins (7,918) (4,891) (4,723)
ICMS (VAT) 0 0 0
Regulatory charges 0 0 0
Service tax (ISSQN) (3,278) (2,575) (2,342)
Net operating revenues 48,084 22,781 25,510
Other operating revenue | Charged service      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 18,475 15,981 10,148
PIS/Pasep and Cofins (2,468) (2,584) (1,471)
ICMS (VAT) 0 0 0
Regulatory charges 0 0 0
Service tax (ISSQN) 0 0 0
Net operating revenues 16,007 13,397 8,677
Other operating revenue | Other income      
DisclosureOfNetOperatingRevenueLineItems [Line Items]      
Gross operating revenues 11,892 15,898 33,304
PIS/Pasep and Cofins (1,588) (2,571) (4,829)
ICMS (VAT) 0 0 0
Regulatory charges 0 0 0
Service tax (ISSQN) 0 0 0
Net operating revenues R$ 10,304 R$ 13,327 R$ 28,475