v3.25.2
Segment information - Summary of Operating Segments (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2025
INR (₨)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
INR (₨)
Mar. 31, 2023
INR (₨)
Disclosure of operating segments [line items]        
Revenue ₨ 97,063 $ 1,136 ₨ 81,319 ₨ 78,223
Other income 6,383 75 7,309 4,581
Total income 109,070 1,277 96,531 89,309
Profit (loss) from operating activities 10,056 118 8,297 (2,563)
Less: Employee benefit and other expenses 4,616 54 4,467 4,413
Depreciation and amortisation expense (20,670) (242) (17,583) (15,901)
Finance costs and fair value change in derivative instruments 52,352 613 47,506 50,966
Profit / (loss) before tax 10,034 117 8,142 (2,470)
Less: Income tax expense 5,443 64 3,995 2,559
Profit / (loss) for the year 4,591 54 4,147 (5,029)
Operating segments [member]        
Disclosure of operating segments [line items]        
Other income 6,735 79 9,716 9,093
Total income 103,424 1,211 90,837 87,227
Raw materials and consumables used and changes in inventories of finished goods 8,593 101 3,646 6,891
Employee benefit and other expenses 13,178 154 13,699 13,407
Total expenses 21,771 255 17,345 20,298
Profit (loss) from operating activities 81,653 956 73,492 66,929
Depreciation and amortisation expense (20,670) (242) (17,583) (15,901)
Change in fair value of warrants 595 7 551 1,356
Finance costs and fair value change in derivative instruments (52,352) (613) (47,487) (49,689)
Profit / (loss) before tax 10,056 118 8,297 (2,563)
Less: Share of (loss) / profit of jointly controlled entities (22) (0) (155) 93
Less: Income tax expense (5,443) (64) (3,995) (2,559)
Profit / (loss) for the year 4,591 54 4,147 (5,029)
Operating segments [member] | Other Segments [Member]        
Disclosure of operating segments [line items]        
Revenue 374 4 198 89
Less: Employee benefit and other expenses (217) (3) (864) (551)
Unallocated amounts [member]        
Disclosure of operating segments [line items]        
Other income 4,677 55 4,945 637
Less: Employee benefit and other expenses (4,004) (47) (4,955) (5,433)
Wind Power [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Other income 4,402   5,835 6,710
Total income 48,160   46,682 42,719
Employee benefit and other expenses 7,019   7,859 7,961
Total expenses 7,019   7,859 7,961
Profit (loss) from operating activities 41,141   38,823 34,758
Solar Power [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Other income 1,973   3,285 2,214
Total income 37,563   36,956 34,319
Employee benefit and other expenses 4,784   5,384 4,830
Total expenses 4,784   5,384 4,830
Profit (loss) from operating activities 32,779   31,572 29,489
Hydro Power [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Other income 84   44 12
Total income 2,321   2,300 2,475
Employee benefit and other expenses 268   367 243
Total expenses 268   367 243
Profit (loss) from operating activities 2,053   1,933 2,232
Transmission On Line [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Other income 217   552 157
Total income 2,127   4,899 7,714
Raw materials and consumables used and changes in inventories of finished goods 602   3,646 6,891
Employee benefit and other expenses 48   89 373
Total expenses 650   3,735 7,264
Profit (loss) from operating activities 1,477   1,164 450
Manufacturing [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Other income 59      
Total income 37,395   15,285  
Raw materials and consumables used and changes in inventories of finished goods 30,015   14,289  
Employee benefit and other expenses 3,177   997  
Total expenses 33,192   15,285  
Profit (loss) from operating activities 4,203      
Adjustments And Eliminations [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Total income (24,142)   (15,285)  
Raw materials and consumables used and changes in inventories of finished goods (22,024)   (14,289)  
Employee benefit and other expenses (2,118)   (997)  
Total expenses (24,142)   (15,285)  
Revenue From External Customers [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue 96,689 1,132 81,121 78,134
Revenue From External Customers [Member] | Wind Power [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue 43,758   40,847 36,009
Revenue From External Customers [Member] | Solar Power [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue 35,590   33,671 32,105
Revenue From External Customers [Member] | Hydro Power [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue 2,237   2,256 2,463
Revenue From External Customers [Member] | Transmission On Line [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue 1,910   4,347 7,557
Revenue From External Customers [Member] | Manufacturing [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue 13,194      
Inter Segment Revenue [Member] | Manufacturing [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue 24,142   15,285  
Inter Segment Revenue [Member] | Adjustments And Eliminations [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue (24,142)   (15,285)  
Revenue From Contracts With Customers [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue 96,689 $ 1,132 81,121 78,134
Revenue From Contracts With Customers [Member] | Wind Power [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue 43,758   40,847 36,009
Revenue From Contracts With Customers [Member] | Solar Power [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue 35,590   33,671 32,105
Revenue From Contracts With Customers [Member] | Hydro Power [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue 2,237   2,256 2,463
Revenue From Contracts With Customers [Member] | Transmission On Line [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue 1,910   4,347 ₨ 7,557
Revenue From Contracts With Customers [Member] | Manufacturing [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue 37,336   15,285  
Revenue From Contracts With Customers [Member] | Adjustments And Eliminations [Member] | Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue ₨ (24,142)   ₨ (15,285)