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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue | The following table provides detail of Pinnacle West’s consolidated revenue disaggregated by revenue sources (dollars in thousands):
| Year Ended December 31, |  | Year Ended December 31, |  | Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Retail Electric Service |  |  |  |  |
Residential | $ | 1,913,324 |  |  | $ | 1,929,178 |  | (a) | $ | 1,761,122 |
Non-Residential | 1,586,940 |  |  | 1,486,098 |  |  | 1,509,514 |
Wholesale Energy Sales | 187,640 |  |  | 93,345 |  |  | 121,805 |
Transmission Services for Others | 99,285 |  |  | 65,859 |  |  | 62,460 |
Other Sources | 16,646 |  |  | 12,502 |  |  | 16,308 |
Total Operating Revenues | $ | 3,803,835 |  |  | $ | 3,586,982 |  |  | $ | 3,471,209 |
(a) Residential revenues for the year ended December 31, 2020, reflect a $24 million reduction related to the Arizona Attorney General matter. See Note 11.
Schedule of allowance for doubtful accounts | The following table provides a rollforward of Pinnacle West’s allowance for doubtful accounts (dollars in thousands):
|  | Year Ended December 31, 2021 |  | Year Ended December 31, 2020 |  | Year Ended December 31, 2019
Allowance for doubtful accounts, balance at beginning of period |  | $ | 19,782 |  |  | $ | 8,171 |  |  | $ | 4,069 |
Bad debt expense |  | 22,251 |  |  | 20,633 |  |  | 11,819 |
Actual write-offs |  | (16,679) |  |  | (9,022) |  |  | (7,717) |
Allowance for doubtful accounts, balance at end of period |  | $ | 25,354 |  |  | $ | 19,782 |  |  | $ | 8,171 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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