| Revenue | 6,162.5a | 7,733.2a |
| Cost of sales | -4,125.2a | -5,575a |
| Electricity Generator Levy | -160.8a | -204.6a |
| Gross profit | 1,876.5a | 1,953.6a |
| Operating and administrative expenses | -720.6a | -711.7a |
| Impairment losses on financial assets | -40a | -32.5a |
| Depreciation | -224.8a | -195.6a |
| Amortisation | -17a | -29.4a |
| Impairment of non-current assets | -14.4a | -70.8a |
| Other (losses)/gains | -7.3a | -3.8a |
| Share of losses from associates | -2.2a | -1.6a |
| Operating profit | 850.2a | 908.2a |
| Foreign exchange (losses)/gains | -9.4a | -9.4a |
| Interest payable and similar charges | -107.5a | -115.5a |
| Interest receivable and similar gains | 20.1a | 13.1a |
| Profit before tax | 753.4a | 796.4a |
| Tax | — | — |
| Before effect of changes in tax rate | -227.9a | -232.5a |
| Effect of changes in tax rate | | -3a |
| Total tax charge | -227.9a | -235.5a |
| Profit for the period | 525.5a | 560.9a |
| Attributable to | — | — |
| Owners of the parent company | 526.6a | 562.2a |
| Non-controlling interests | -1.1a | -1.3a |