26. Deferred revenue

x 1 million

2023

2022

Book value at 1 January

983

898

Customer construction contributions received

131

107

Customer construction contributions paid

-1

-

Revenue recognised

-23

-22

Book value at 31 December

1,090

983

Classification

2023

2022

Current

25

23

Non-current

1,065

960

Total

1,090

983

Short-term deferred revenue has been recognised under ‘contract liabilities’ in 27 Trade and other liabilities.