| Dec 31, 2011 | Dec 31, 2012 | Dec 31, 2013 | Dec 31, 2014 | Dec 31, 2015 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Net income | 21 | 22 | 22 | 52 | 38 | 53 | 61 | 39 | 24 | 62 | 60 | 74 | 85 | 94 |
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| Depreciation and amortization | 33 | 35 | 37 | 39 | 42 | 46 | 51 | 57 | 68 | 92 | 96 | 106 | 108 | 115 |
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| Deferred income taxes | 16 | 12 | 12 | 26 | 16 | 5 | -0 | -9 | -1 | -5 | -3 | -3 | -9 | 10 |
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| Stock-based compensation | 1 | 1 | 1 | 1 | 2 | 2 | 3 | 2 | 3 | 4 | 4 | 5 | 5 | 6 |
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| Allowance for equity funds used during construction | - | - | - | - | - | - | - | - | - | 1 | 2 | 2 | 2 | 2 |
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| Loss (gain) on sale of nonutility properties and other assets | - | - | - | - | - | - | - | - | - | - | 11 | 6 | - | -1 |
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| Accounts receivable and accrued unbilled revenue | 2 | 1 | 3 | 1 | -1 | 5 | 2 | 2 | 4 | 19 | 6 | 8 | 11 | 13 |
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| Increase (Decrease) in Accounts Payable | -0 | 1 | -0 | -0 | 2 | -0 | 3 | 2 | 2 | -0 | 5 | -1 | 0 | 4 |
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| Accrued groundwater extraction charges, purchased water and power | - | - | - | - | - | - | - | - | - | - | - | - | 5 | 1 |
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| Increase (Decrease) in Accrued Taxes Payable | -1 | 5 | -1 | -6 | -3 | -1 | 2 | 6 | -6 | -4 | -6 | -12 | -22 | -18 |
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| Postretirement benefits | -0 | 0 | 0 | -0 | -0 | -0 | -1 | 0 | -4 | -3 | -4 | -7 | -2 | -4 |
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| Regulatory assets and liabilities excluding income tax temporary differences and postretirement benefits | - | - | - | - | - | - | - | - | - | - | 15 | -2 | -12 | 2 |
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| Up-front service concession payments | - | - | - | - | - | - | - | - | - | 5 | - | 2 | - | 24 |
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| Other noncurrent assets and liabilities | - | - | - | - | - | - | - | - | -7 | -1 | -13 | -18 | -21 | -21 |
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| Other changes, net | 0 | -1 | 1 | -1 | 2 | -0 | -1 | -2 | -7 | 2 | 2 | -0 | -0 | -8 |
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| Net cash provided by operating activities | 64 | 74 | 63 | 66 | 97 | 114 | 101 | 91 | 130 | 104 | 130 | 166 | 191 | 196 |
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| Company-funded | - | - | - | - | - | - | - | - | - | - | 234 | 219 | 272 | 353 |
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| Contributions in aid of construction | - | - | - | - | - | - | - | - | 14 | 17 | 17 | 23 | 17 | 24 |
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| Additions to nonutility assets and real estate investments | - | - | - | - | - | - | - | - | - | - | - | - | 24 | 0 |
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| Cost to retire utility plant, net of salvage | 2 | 1 | 3 | 2 | 4 | 3 | 3 | 4 | 5 | 3 | 3 | 3 | 2 | 3 |
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| Proceeds from sale of assets | - | - | - | - | - | - | - | - | - | - | 18 | 1 | - | 41 |
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| Net cash used in investing activities | -76 | -104 | -96 | -98 | -111 | -122 | -114 | -147 | -1,018 | -214 | -260 | -244 | -322 | -340 |
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| Proceeds from Lines of Credit | 18 | 16 | 49 | 57 | 97 | 62 | 57 | 76 | 105 | 276 | 97 | 159 | 146 | 242 |
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| Repayments of lines of credit | 22 | 1 | 42 | 66 | 76 | 82 | 46 | 1 | 192 | 218 | 209 | 62 | 134 | 295 |
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| Long-term borrowings | 50 | - | - | 50 | - | 51 | - | - | 590 | 85 | 247 | 55 | 70 | 185 |
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| Repayments of long-term borrowings | 1 | 4 | 5 | 1 | 1 | 17 | 3 | - | 1 | 29 | 76 | 89 | 4 | 49 |
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| Dividends paid | 13 | 13 | 14 | 15 | 16 | 17 | 21 | 23 | 34 | 37 | 40 | 44 | 48 | 52 |
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| Receipts of advances and contributions in aid of construction | - | - | - | - | - | - | - | - | - | 24 | 26 | 24 | 22 | 33 |
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| Refunds of advances for construction | - | - | - | - | - | - | - | - | - | - | - | 3 | 3 | 3 |
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| Proceeds from Issuance of Common Stock | - | - | 36 | - | - | - | - | 411 | -0 | - | 91 | 39 | 81 | 85 |
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| Other changes, net | - | - | - | - | - | - | 0 | -3 | 1 | -0 | -0 | -1 | -1 | -0 |
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| Net cash provided by financing activities | 37 | 6 | 32 | 32 | 16 | 28 | -5 | 468 | 485 | 102 | 133 | 78 | 129 | 146 |
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| Net change in cash and cash equivalents | - | - | - | - | - | - | - | 413 | -403 | -9 | 3 | 0 | -3 | 1 |
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| Interest | 20 | 21 | 21 | 21 | 24 | 24 | 25 | 27 | - | - | - | - | - | 73 |
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| Interest, net of amounts capitalized | - | - | - | - | - | - | - | - | 32 | 60 | 58 | 64 | 68 | 70 |
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| Income taxes | - | -1 | 4 | 6 | 10 | 28 | 34 | 14 | 16 | 10 | 8 | 7 | 23 | -1 |
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| Capital Expenditures Incurred but Not yet Paid | - | - | - | - | - | - | - | - | - | - | - | 23 | 36 | 42 |
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| Utility Property Installed by Developer | - | - | - | - | - | - | - | - | 3 | 10 | 3 | 2 | 3 | 2 |
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| Proceeds receivable from sale of real estate investments | - | - | - | - | - | - | - | - | - | - | - | - | - | 3 |
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| Accrued selling expenses on sale of real estate investments | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 |
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| Seller financing in asset acquisition, net of discount | - | - | - | - | - | - | - | - | - | - | - | - | 15 | - |
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