| Total revenues | 2,083.56a | 2,371.99a | 2,578.01a |
| Cost of natural gas | -778.33a | -1,134.51a | -1,459.09a |
| Operating expenses | — | — | — |
| Operations and maintenance | -530.11a | -508.4a | -472.27a |
| Depreciation and amortization | -296.7a | -279.83a | -228.48a |
| General taxes | -79.37a | -71.66a | -68.22a |
| Total operating expenses | -906.18a | -859.89a | -768.96a |
| Operating income | 399.04a | 377.59a | 349.96a |
| Other income, net | 7.43a | 9.48a | -4.18a |
| Interest expense, net | -147.24a | -115.34a | -77.51a |
| Income before income taxes | 259.24a | 271.73a | 268.27a |
| Income taxes | -36.39a | -40.5a | -46.53a |
| Net income | 222.85a | 231.23a | 221.74a |