| Assets | — | — |
| Property, plant and equipment | — | — |
| Property, plant and equipment | 9,124.13a | 8,468.97a |
| Accumulated depreciation and amortization | 2,478.26a | 2,333.76a |
| Net property, plant and equipment | 6,645.87a | 6,135.21a |
| Current assets | — | — |
| Cash and cash equivalents | 58a | 18.84a |
| Restricted cash and cash equivalents | 20.54a | 20.55a |
| Total cash, cash equivalents and restricted cash and cash equivalents | 78.54a | 39.39a |
| Accounts receivable, net | 408.45a | 347.86a |
| Materials and supplies | 91.66a | 77.65a |
| Income tax receivable | 53.62a | 3.95a |
| Natural gas in storage | 161.18a | 187.1a |
| Regulatory assets | 101.21a | 75.31a |
| Other current assets | 35.22a | 33.95a |
| Total current assets | 929.88a | 765.2a |
| Goodwill and other assets | — | — |
| Regulatory assets | 278.01a | 287.91a |
| Securitized intangible asset, net | 265.95a | 293.62a |
| Goodwill | 157.95a | 157.95a |
| Pension and other postemployment benefits | 42.88a | 36.48a |
| Other assets | 105.03a | 94.62a |
| Total goodwill and other assets | 849.82a | 870.58a |
| Total assets | 8,425.57a | 7,770.99a |
| Equity and liabilities | — | — |
| Equity and long-term debt | — | — |
| Common stock | 0.6a | 0.57a |
| Paid-in capital | 2,294.47a | 2,028.76a |
| Retained earnings | 809.61a | 737.74a |
| Accumulated other comprehensive loss | -0.13a | -1.18a |
| Total equity | 3,104.55a | 2,765.88a |
| Other long-term debt, excluding current maturities, net of issuance costs | 2,131.72a | 1,877.9a |
| Securitized utility tariff bonds, excluding current maturities, net of issuance costs | 253.57a | 282.51a |
| Total long-term debt, excluding current maturities, net of issuance costs | 2,385.29a | 2,160.4a |
| Total equity and long-term debt | 5,489.83a | 4,926.28a |
| Current liabilities | — | — |
| Current maturities of other long-term debt | 0.01a | 772.98a |
| Current maturities of securitized utility tariff bonds | 28.96a | 27.43a |
| Notes payable | 914.6a | 88.5a |
| Accounts payable | 261.32a | 278.06a |
| Accrued taxes other than income | 75.61a | 68.79a |
| Regulatory liabilities | 22.53a | 66.9a |
| Customer deposits | 56.24a | 62.19a |
| Other current liabilities | 99.01a | 112.37a |
| Total current liabilities | 1,458.28a | 1,477.22a |
| Deferred credits and other liabilities | — | — |
| Deferred income taxes | 891.74a | 752.07a |
| Regulatory liabilities | 467.56a | 500.48a |
| Other deferred credits | 118.16a | 114.95a |
| Total deferred credits and other liabilities | 1,477.46a | 1,367.5a |
| Total liabilities and equity | 8,425.57a | 7,770.99a |