v3.26.3
Exceptional items and remeasurements - Schedule of exceptional items and remeasurements from continuing operations (Details)
£ in Millions, $ in Millions
 6 Months Ended
Sep. 30, 2026
GBP (£)
Sep. 30, 2026
USD ($)
Sep. 30, 2025
GBP (£)
Sep. 30, 2025
USD ($)
Included within operating costs        
Reclassification of foreign currency translation reserve £ (11)   £ 76  
Operating profit 2,359   1,526  
Included within net finance costs (note 5)        
Net gains on financial assets at fair value through profit and loss 0   2  
Finance income (cost) (718)   (739)  
Profit before tax 1,730   826  
Tax on exceptional items and remeasurements (386)   (208)  
Total profit for the period 1,344   618  
Community Offshore Wind, LLC        
Included within operating costs        
Impairment reversal of joint venture | $       $ (303)
Exceptional items and remeasurements        
Included within revenue        
Net gain on investment held by NG Partners 142      
Included within operating costs        
Impairment reversal of joint venture 75      
Reclassification of foreign currency translation reserve 11      
Major transformation programme     (15)  
Transaction, separation and integration costs     (19)  
Changes in environmental provisions     25  
Net gains on commodity contract derivatives (19)   16  
Operating profit 209   (89)  
Included within net finance costs (note 5)        
Net gains (losses) on derivative financial instruments 4   (63)  
Net gains on financial assets at fair value through profit and loss     2  
Finance income (cost) 4   (61)  
Profit before tax 213   (150)  
Tax on exceptional items and remeasurements (37)   15  
Total profit for the period 176   (135)  
Exceptional items and remeasurements | National Grid Renewables        
Included within operating costs        
Net loss on disposal of NG Renewables     (96)  
Exceptional items        
Included within revenue        
Net gain on investment held by NG Partners 142      
Included within operating costs        
Impairment reversal of joint venture 75      
Reclassification of foreign currency translation reserve 11      
Major transformation programme     (15)  
Transaction, separation and integration costs     (19)  
Changes in environmental provisions     25  
Net gains on commodity contract derivatives 0   0  
Operating profit 228   (105)  
Included within net finance costs (note 5)        
Net gains (losses) on derivative financial instruments 0   0  
Net gains on financial assets at fair value through profit and loss     0  
Finance income (cost) 0   0  
Profit before tax 228   (105)  
Tax on exceptional items and remeasurements (42)   2  
Total profit for the period 186   (103)  
Exceptional items | Community Offshore Wind, LLC        
Included within operating costs        
Impairment reversal of joint venture 75 $ 100    
Reclassification of foreign currency translation reserve 11      
Exceptional items | National Grid Renewables        
Included within operating costs        
Net loss on disposal of NG Renewables     (96)  
Remeasurements        
Included within revenue        
Net gain on investment held by NG Partners 0      
Included within operating costs        
Impairment reversal of joint venture 0      
Reclassification of foreign currency translation reserve 0      
Major transformation programme     0  
Transaction, separation and integration costs     0  
Changes in environmental provisions     0  
Net gains on commodity contract derivatives (19)   16  
Operating profit (19)   16  
Included within net finance costs (note 5)        
Net gains (losses) on derivative financial instruments 4   (63)  
Net gains on financial assets at fair value through profit and loss     2  
Finance income (cost) 4   (61)  
Profit before tax (15)   (45)  
Tax on exceptional items and remeasurements 5   13  
Total profit for the period £ (10)   (32)  
Remeasurements | National Grid Renewables        
Included within operating costs        
Net loss on disposal of NG Renewables     £ 0