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Segments Disclosures - Reported Segment Earnings (Loss) and Segment Assets (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of operating segments [line items] |  |  |
Revenue | $ 3,355 | $ 2,976 | $ 2,721
Fuel and purchased power | 1,060 | 1,263 | 1,054
Carbon compliance | 112 | 78 | 178
Gross margin | 2,183 | 1,635 | 1,489
OM&A |  |  | 511
Taxes, other than income taxes | 29 | 33 | 32
Net other operating loss (income) | (47) | (58) | 8
Equity income | 4 | 9 | 9
Finance lease income | 12 | 19 | 25
Depreciation and amortization | (621) | (599) | (529)
Asset impairment charges | 48 | (9) | (648)
Interest income | 59 | 24 | 11
Interest expense | 281 | 286 | 256
Foreign exchange gain (loss) | (7) | 4 | 16
Gain on sale of assets and other | 4 | 52 | 54
Earnings (loss) before income taxes | 880 | 353 | (380)
Previously Reported |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 3,355 | 2,976 | 2,721
Fuel and purchased power | 1,060 | 1,263 | 1,054
OM&A | 539 | 521 | 511
Net other operating loss (income) | (47) | (58) | 8
Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 3,326 | 3,475 | 2,791
Fuel and purchased power | 1,056 | 1,259 | 843
Carbon compliance | 112 | 78 | 178
Gross margin | 2,158 | 2,138 | 1,770
OM&A |  |  | 491
Taxes, other than income taxes | 30 | 35 | 33
Net other operating loss (income) | (46) | (54) | (40)
Adjusted EBITDA | 1,632 | 1,634 | 1,286
Operating segments | Previously Reported |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 3,376 | 2,990 | 2,739
Fuel and purchased power | 1,060 | 1,263 | 1,054
OM&A | 542 | 523 | 513
Net other operating loss (income) | (47) | (61) | 8
Operating segments | Unrealized mark-to-market (gain) loss |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | (37) | 378 | (34)
Operating segments | Realized gain (loss) on closed exchange positions |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | (81) | 43 | 23
Operating segments | Decrease in finance lease receivable |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 55 | 46 | 41
Operating segments | Finance lease income |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 12 | 19 | 25
Operating segments | Unrealized foreign exchange gain on commodity |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 1 | (1) | (3)
Operating segments | Australian interest income |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power | (4) | (4) | (4)
Operating segments | Insurance recovery |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) | 1 | 7 |
Operating segments | Mine depreciation |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | (190)
Operating segments | Coal inventory writedown |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | (17)
Operating segments | Parts and materials writedown |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | (28)
Operating segments | Curtailment gain |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | 6
Operating segments | Royalty onerous contract and contract termination penalties |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) |  |  | (48)
Material reconciling items |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 50 | (485) | (52)
Fuel and purchased power | 4 | 4 | 211
Carbon compliance | 0 | 0 | 0
Gross margin | 46 | (489) | (263)
OM&A |  |  | 22
Taxes, other than income taxes | 0 | 0 | 0
Net other operating loss (income) | (1) | (7) | 48
Material reconciling items | Previously Reported |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Fuel and purchased power | 0 | 0 | 0
OM&A | 0 | 0 | 0
Net other operating loss (income) | 0 | 0 | 0
Material reconciling items | Unrealized mark-to-market (gain) loss |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 37 | (378) | 34
Material reconciling items | Realized gain (loss) on closed exchange positions |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 81 | (43) | (23)
Material reconciling items | Decrease in finance lease receivable |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | (55) | (46) | (41)
Material reconciling items | Finance lease income |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | (12) | (19) | (25)
Material reconciling items | Unrealized foreign exchange gain on commodity |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | (1) | 1 | 3
Material reconciling items | Australian interest income |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power | 4 | 4 | 4
Material reconciling items | Insurance recovery |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) | (1) | (7) |
Material reconciling items | Mine depreciation |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | 190
Material reconciling items | Coal inventory writedown |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | 17
Material reconciling items | Parts and materials writedown |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | 28
Material reconciling items | Curtailment gain |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | (6)
Material reconciling items | Royalty onerous contract and contract termination penalties |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) |  |  | 48
Material reconciling items | Contribution from equity accounted investments |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | (21) | (14) | (18)
Fuel and purchased power | 0 | 0 | 0
Carbon compliance | 0 | 0 | 0
Gross margin | (21) | (14) | (18)
OM&A |  |  | (2)
Taxes, other than income taxes | (1) | (2) | (1)
Net other operating loss (income) | 0 | 3 | 0
Material reconciling items | Contribution from equity accounted investments | Previously Reported |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | (21) | (14) | (18)
Fuel and purchased power | 0 | 0 | 0
OM&A | (3) | (2) | (2)
Net other operating loss (income) | 0 | 3 | 0
Material reconciling items | Contribution from equity accounted investments | Unrealized mark-to-market (gain) loss |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Material reconciling items | Contribution from equity accounted investments | Realized gain (loss) on closed exchange positions |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Material reconciling items | Contribution from equity accounted investments | Decrease in finance lease receivable |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Material reconciling items | Contribution from equity accounted investments | Finance lease income |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Material reconciling items | Contribution from equity accounted investments | Unrealized foreign exchange gain on commodity |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Material reconciling items | Contribution from equity accounted investments | Australian interest income |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power | 0 | 0 | 0
Material reconciling items | Contribution from equity accounted investments | Insurance recovery |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) | 0 | 0 |
Material reconciling items | Contribution from equity accounted investments | Mine depreciation |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | 0
Material reconciling items | Contribution from equity accounted investments | Coal inventory writedown |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | 0
Material reconciling items | Contribution from equity accounted investments | Parts and materials writedown |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | 0
Material reconciling items | Contribution from equity accounted investments | Curtailment gain |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | 0
Material reconciling items | Contribution from equity accounted investments | Royalty onerous contract and contract termination penalties |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) |  |  | 0
Hydro | Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 529 | 607 | 383
Fuel and purchased power | 19 | 22 | 16
Carbon compliance | 0 | 0 | 0
Gross margin | 510 | 585 | 367
OM&A |  |  | 42
Taxes, other than income taxes | 3 | 3 | 3
Net other operating loss (income) | 0 | 0 | 0
Adjusted EBITDA | 459 | 527 | 322
Hydro | Operating segments | Previously Reported |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 533 | 606 | 383
Fuel and purchased power | 19 | 22 | 16
OM&A | 48 | 55 | 42
Net other operating loss (income) | 0 | 0 | 0
Hydro | Operating segments | Unrealized mark-to-market (gain) loss |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | (4) | 1 | 0
Hydro | Operating segments | Realized gain (loss) on closed exchange positions |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Hydro | Operating segments | Decrease in finance lease receivable |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Hydro | Operating segments | Finance lease income |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Hydro | Operating segments | Unrealized foreign exchange gain on commodity |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Hydro | Operating segments | Australian interest income |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power | 0 | 0 | 0
Hydro | Operating segments | Insurance recovery |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) | 0 | 0 |
Hydro | Operating segments | Mine depreciation |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | 0
Hydro | Operating segments | Coal inventory writedown |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | 0
Hydro | Operating segments | Parts and materials writedown |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | 0
Hydro | Operating segments | Curtailment gain |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | 0
Hydro | Operating segments | Royalty onerous contract and contract termination penalties |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) |  |  | 0
Wind and Solar | Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 373 | 407 | 348
Fuel and purchased power | 30 | 31 | 17
Carbon compliance | 0 | 1 | 0
Gross margin | 343 | 375 | 331
OM&A |  |  | 59
Taxes, other than income taxes | 12 | 12 | 10
Net other operating loss (income) | (6) | (16) | 0
Adjusted EBITDA | 257 | 311 | 262
Wind and Solar | Operating segments | Previously Reported |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 357 | 303 | 323
Fuel and purchased power | 30 | 31 | 17
OM&A | 80 | 68 | 59
Net other operating loss (income) | (7) | (23) | 0
Wind and Solar | Operating segments | Unrealized mark-to-market (gain) loss |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 16 | 104 | 25
Wind and Solar | Operating segments | Realized gain (loss) on closed exchange positions |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Wind and Solar | Operating segments | Decrease in finance lease receivable |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Wind and Solar | Operating segments | Finance lease income |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Wind and Solar | Operating segments | Unrealized foreign exchange gain on commodity |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Wind and Solar | Operating segments | Australian interest income |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power | 0 | 0 | 0
Wind and Solar | Operating segments | Insurance recovery |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) | 1 | 7 |
Wind and Solar | Operating segments | Mine depreciation |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | 0
Wind and Solar | Operating segments | Coal inventory writedown |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | 0
Wind and Solar | Operating segments | Parts and materials writedown |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | 0
Wind and Solar | Operating segments | Curtailment gain |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | 0
Wind and Solar | Operating segments | Royalty onerous contract and contract termination penalties |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) |  |  | 0
Gas | Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 1,525 | 1,521 | 1,126
Fuel and purchased power | 449 | 637 | 374
Carbon compliance | 112 | 83 | 118
Gross margin | 964 | 801 | 634
OM&A |  |  | 173
Taxes, other than income taxes | 11 | 15 | 13
Net other operating loss (income) | (40) | (38) | (40)
Adjusted EBITDA | 801 | 629 | 488
Gas | Operating segments | Previously Reported |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 1,514 | 1,209 | 1,109
Fuel and purchased power | 453 | 641 | 457
OM&A | 192 | 195 | 175
Net other operating loss (income) | (40) | (38) | (40)
Gas | Operating segments | Unrealized mark-to-market (gain) loss |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | (67) | 251 | (40)
Gas | Operating segments | Realized gain (loss) on closed exchange positions |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 10 | (4) | (6)
Gas | Operating segments | Decrease in finance lease receivable |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 55 | 46 | 41
Gas | Operating segments | Finance lease income |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 12 | 19 | 25
Gas | Operating segments | Unrealized foreign exchange gain on commodity |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 1 | 0 | (3)
Gas | Operating segments | Australian interest income |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power | (4) | (4) | (4)
Gas | Operating segments | Insurance recovery |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) | 0 | 0 |
Gas | Operating segments | Mine depreciation |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | (79)
Gas | Operating segments | Coal inventory writedown |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | 0
Gas | Operating segments | Parts and materials writedown |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | (2)
Gas | Operating segments | Curtailment gain |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | 0
Gas | Operating segments | Royalty onerous contract and contract termination penalties |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) |  |  | 0
Energy Transition |  |  |
Disclosure of operating segments [line items] |  |  |
Asset impairment charges |  |  | (191)
Energy Transition | Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 746 | 724 | 728
Fuel and purchased power | 557 | 566 | 432
Carbon compliance | 0 | (1) | 60
Gross margin | 189 | 159 | 236
OM&A |  |  | 97
Taxes, other than income taxes | 3 | 4 | 6
Net other operating loss (income) | 0 | 0 | 0
Adjusted EBITDA | 122 | 86 | 133
Energy Transition | Operating segments | Previously Reported |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 751 | 714 | 709
Fuel and purchased power | 557 | 566 | 560
OM&A | 64 | 69 | 117
Net other operating loss (income) | 0 | 0 | 48
Energy Transition | Operating segments | Unrealized mark-to-market (gain) loss |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | (5) | 10 | 19
Energy Transition | Operating segments | Realized gain (loss) on closed exchange positions |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Energy Transition | Operating segments | Decrease in finance lease receivable |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Energy Transition | Operating segments | Finance lease income |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Energy Transition | Operating segments | Unrealized foreign exchange gain on commodity |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Energy Transition | Operating segments | Australian interest income |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power | 0 | 0 | 0
Energy Transition | Operating segments | Insurance recovery |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) | 0 | 0 |
Energy Transition | Operating segments | Mine depreciation |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | (111)
Energy Transition | Operating segments | Coal inventory writedown |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | (17)
Energy Transition | Operating segments | Parts and materials writedown |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | (26)
Energy Transition | Operating segments | Curtailment gain |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | 6
Energy Transition | Operating segments | Royalty onerous contract and contract termination penalties |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) |  |  | (48)
Energy Marketing | Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 152 | 218 | 202
Fuel and purchased power | 0 | 0 | 0
Carbon compliance | 0 | 0 | 0
Gross margin | 152 | 218 | 202
OM&A |  |  | 36
Taxes, other than income taxes | 0 | 0 | 0
Net other operating loss (income) | 0 | 0 | 0
Adjusted EBITDA | 109 | 183 | 166
Energy Marketing | Operating segments | Previously Reported |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 220 | 160 | 211
Fuel and purchased power | 0 | 0 | 0
OM&A | 43 | 35 | 36
Net other operating loss (income) | 0 | 0 | 0
Energy Marketing | Operating segments | Unrealized mark-to-market (gain) loss |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 23 | 12 | (38)
Energy Marketing | Operating segments | Realized gain (loss) on closed exchange positions |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | (91) | 47 | 29
Energy Marketing | Operating segments | Decrease in finance lease receivable |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Energy Marketing | Operating segments | Finance lease income |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Energy Marketing | Operating segments | Unrealized foreign exchange gain on commodity |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | (1) | 0
Energy Marketing | Operating segments | Australian interest income |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power | 0 | 0 | 0
Energy Marketing | Operating segments | Insurance recovery |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) | 0 | 0 |
Energy Marketing | Operating segments | Mine depreciation |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | 0
Energy Marketing | Operating segments | Coal inventory writedown |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | 0
Energy Marketing | Operating segments | Parts and materials writedown |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | 0
Energy Marketing | Operating segments | Curtailment gain |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | 0
Energy Marketing | Operating segments | Royalty onerous contract and contract termination penalties |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) |  |  | 0
Corporate | Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 1 | (2) | 4
Fuel and purchased power | 1 | 3 | 4
Carbon compliance | 0 | (5) | 0
Gross margin | 0 | 0 | 0
OM&A |  |  | 84
Taxes, other than income taxes | 1 | 1 | 1
Net other operating loss (income) | 0 | 0 | 0
Adjusted EBITDA | (116) | (102) | (85)
Corporate | Operating segments | Previously Reported |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 1 | (2) | 4
Fuel and purchased power | 1 | 3 | 4
OM&A | 115 | 101 | 84
Net other operating loss (income) | 0 | 0 | 0
Corporate | Operating segments | Unrealized mark-to-market (gain) loss |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Corporate | Operating segments | Realized gain (loss) on closed exchange positions |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Corporate | Operating segments | Decrease in finance lease receivable |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Corporate | Operating segments | Finance lease income |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Corporate | Operating segments | Unrealized foreign exchange gain on commodity |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 0 | 0 | 0
Corporate | Operating segments | Australian interest income |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power | 0 | 0 | 0
Corporate | Operating segments | Insurance recovery |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) | $ 0 | $ 0 |
Corporate | Operating segments | Mine depreciation |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | 0
Corporate | Operating segments | Coal inventory writedown |  |  |
Disclosure of operating segments [line items] |  |  |
Fuel and purchased power |  |  | 0
Corporate | Operating segments | Parts and materials writedown |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | 0
Corporate | Operating segments | Curtailment gain |  |  |
Disclosure of operating segments [line items] |  |  |
OM&A |  |  | 0
Corporate | Operating segments | Royalty onerous contract and contract termination penalties |  |  |
Disclosure of operating segments [line items] |  |  |
Net other operating loss (income) |  |  | $ 0

X
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