| Income | — | — |
| Revenue from operations | 457,923.2a | 458,431a |
| Other income | 16,670.6a | 10,700.2a |
| Total income | 474,593.8a | 469,131.2a |
| Expenses | — | — |
| Employee benefits expense | -26,044a | -24,344.4a |
| Finance costs | -87,001.3a | -87,727.5a |
| Depreciation and amortisation expense | -129,041.5a | -130,952.7a |
| Other expenses | -41,225.5a | -35,057.7a |
| Total expenses | -283,312.3a | -278,082.3a |
| Profit before share of net profit/(loss) of investments in joint ventures accounted for using equity method, tax and regulatory deferral account balances | 191,281.5a | 191,048.9a |
| Share of net profit/(loss) of investments in joint ventures accounted for using equity method | -1,102.6a | -195.5a |
| Profit before tax and regulatory deferral account balances | 190,178.9a | 190,853.4a |
| Tax expense | — | — |
| Current tax - current year | -33,622.5a | -33,406.9a |
| Earlier years | -0.2a | -24.8a |
| Deferred tax | -4,104.9a | -3,974.2a |
| Profit for the period before regulatory deferral account balances | 152,451.3a | 161,445.5a |
| Net movement in regulatory deferral account balances - income/(expenses) (net of tax) | 2,763.1a | -5,713.9a |
| Profit for the period attributable to owners of the parent | 155,214.4a | 155,731.6a |