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Revenue: | 9 Months Ended
--- | ---
Sep. 30, 2021
Revenue from Contract with Customer [Abstract] |
Revenue | RevenueOur revenue contracts generally provide for performance obligations that are: fulfilled and transfer control to customers over time; represent a series of distinct services that are substantially the same; involve the same pattern of transfer to the customer; and provide a right to consideration from our customers in an amount that corresponds directly with the value to the customer for the performance completed to date. Therefore, we recognize revenue in the amount to which we have a right to invoice. The following tables depict the disaggregation of revenue, including intercompany revenue, from contracts with customers by customer type and timing of revenue recognition for each of the reportable segments for the three and nine months ended September 30, 2021 and 2020. Sales tax and other similar taxes are excluded from revenues.
Three Months Ended September 30, 2021 | Electric Utilities | Gas Utilities | Power Generation | Mining | Inter-company Revenues | Total
Customer types: | (in thousands)
Retail | $ | 179,982 |  | $ | 115,908 |  | $ | — |  | $ | 15,814 |  | $ | (8,846) |  | $ | 302,858 |
Transportation | — |  | 37,651 |  | — |  | — |  | (110) |  | 37,541 |
Wholesale | 3,856 |  | — |  | 26,058 |  | — |  | (23,725) |  | 6,189 |
Market - off-system sales | 15,149 |  | 75 |  | — |  | — |  | (1,638) |  | 13,586 |
Transmission/Other | 13,913 |  | 9,863 |  | — |  | — |  | (5,297) |  | 18,479 |
Revenue from contracts with customers | $ | 212,900 |  | $ | 163,497 |  | $ | 26,058 |  | $ | 15,814 |  | $ | (39,616) |  | $ | 378,653 |
Other revenues | 203 |  | 1,186 |  | 462 |  | 574 |  | (488) |  | 1,937 |
Total revenues | $ | 213,103 |  | $ | 164,683 |  | $ | 26,520 |  | $ | 16,388 |  | $ | (40,104) |  | $ | 380,590 |
Timing of revenue recognition: |  |  |  |  |  |
Services transferred at a point in time | $ | — |  | $ | — |  | $ | — |  | $ | 15,814 |  | $ | (8,846) |  | $ | 6,968 |
Services transferred over time | 212,900 |  | 163,497 |  | 26,058 |  | — |  | (30,770) |  | 371,685 |
Revenue from contracts with customers | $ | 212,900 |  | $ | 163,497 |  | $ | 26,058 |  | $ | 15,814 |  | $ | (39,616) |  | $ | 378,653 |
Three Months Ended September 30, 2020 | Electric Utilities | Gas Utilities | Power Generation | Mining | Inter-company Revenues | Total
Customer Types: | (in thousands)
Retail | $ | 169,505 |  | $ | 94,367 |  | $ | — |  | $ | 14,668 |  | $ | (8,100) |  | $ | 270,440 |
Transportation | — |  | 38,196 |  | — |  | — |  | (139) |  | 38,057 |
Wholesale | 5,925 |  | — |  | 26,049 |  | — |  | (24,521) |  | 7,453 |
Market - off-system sales | 9,535 |  | 36 |  | — |  | — |  | (1,904) |  | 7,667 |
Transmission/Other | 15,653 |  | 10,277 |  | — |  | — |  | (5,235) |  | 20,695 |
Revenue from contracts with customers | $ | 200,618 |  | $ | 142,876 |  | $ | 26,049 |  | $ | 14,668 |  | $ | (39,899) |  | $ | 344,312 |
Other revenues | 224 |  | 1,053 |  | 469 |  | 568 |  | (36) |  | 2,278 |
Total Revenues | $ | 200,842 |  | $ | 143,929 |  | $ | 26,518 |  | $ | 15,236 |  | $ | (39,935) |  | $ | 346,590 |
Timing of Revenue Recognition: |  |  |  |  |  |
Services transferred at a point in time | $ | — |  | $ | — |  | $ | — |  | $ | 14,668 |  | $ | (8,100) |  | $ | 6,568 |
Services transferred over time | 200,618 |  | 142,876 |  | 26,049 |  | — |  | (31,799) |  | 337,744 |
Revenue from contracts with customers | $ | 200,618 |  | $ | 142,876 |  | $ | 26,049 |  | $ | 14,668 |  | $ | (39,899) |  | $ | 344,312 |
Nine Months Ended September 30, 2021 | Electric Utilities | Gas Utilities | Power Generation | Mining | Inter-company Revenues | Total
Customer types: | (in thousands)
Retail | $ | 536,952 |  | $ | 601,358 |  | $ | — |  | $ | 43,751 |  | $ | (23,093) |  | $ | 1,158,968 |
Transportation | — |  | 117,251 |  | — |  | — |  | (329) |  | 116,922 |
Wholesale | 12,788 |  | — |  | 79,662 |  | — |  | (71,656) |  | 20,794 |
Market - off-system sales | 31,746 |  | 235 |  | — |  | — |  | (6,197) |  | 25,784 |
Transmission/Other | 41,339 |  | 29,378 |  | — |  | — |  | (15,892) |  | 54,825 |
Revenue from contracts with customers | $ | 622,825 |  | $ | 748,222 |  | $ | 79,662 |  | $ | 43,751 |  | $ | (117,167) |  | $ | 1,377,293 |
Other revenues | 2,619 |  | 5,030 |  | 1,369 |  | 1,738 |  | (1,455) |  | 9,301 |
Total revenues | $ | 625,444 |  | $ | 753,252 |  | $ | 81,031 |  | $ | 45,489 |  | $ | (118,622) |  | $ | 1,386,594 |
Timing of revenue recognition: |  |  |  |  |  |
Services transferred at a point in time | $ | — |  | $ | — |  | $ | — |  | $ | 43,751 |  | $ | (23,093) |  | $ | 20,658 |
Services transferred over time | 622,825 |  | 748,222 |  | 79,662 |  | — |  | (94,074) |  | 1,356,635 |
Revenue from contracts with customers | $ | 622,825 |  | $ | 748,222 |  | $ | 79,662 |  | $ | 43,751 |  | $ | (117,167) |  | $ | 1,377,293 |
Nine Months Ended September 30, 2020 | Electric Utilities | Gas Utilities | Power Generation | Mining | Inter-company Revenues | Total
Customer Types: | (in thousands)
Retail | $ | 459,949 |  | $ | 513,208 |  | $ | — |  | $ | 43,917 |  | $ | (23,855) |  | $ | 993,219 |
Transportation | — |  | 113,096 |  | — |  | — |  | (416) |  | 112,680 |
Wholesale | 14,947 |  | — |  | 77,234 |  | — |  | (72,609) |  | 19,572 |
Market - off-system sales | 17,940 |  | 197 |  | — |  | — |  | (6,123) |  | 12,014 |
Transmission/Other | 43,271 |  | 32,038 |  | — |  | — |  | (14,080) |  | 61,229 |
Revenue from contracts with customers | $ | 536,107 |  | $ | 658,539 |  | $ | 77,234 |  | $ | 43,917 |  | $ | (117,083) |  | $ | 1,198,714 |
Other revenues | 2,074 |  | 7,273 |  | 1,372 |  | 1,940 |  | (819) |  | 11,840 |
Total Revenues | $ | 538,181 |  | $ | 665,812 |  | $ | 78,606 |  | $ | 45,857 |  | $ | (117,902) |  | $ | 1,210,554 |
Timing of Revenue Recognition: |  |  |  |  |  |
Services transferred at a point in time | $ | — |  | $ | — |  | $ | — |  | $ | 43,917 |  | $ | (23,855) |  | $ | 20,062 |
Services transferred over time | 536,107 |  | 658,539 |  | 77,234 |  | — |  | (93,228) |  | 1,178,652 |
Revenue from contracts with customers | $ | 536,107 |  | $ | 658,539 |  | $ | 77,234 |  | $ | 43,917 |  | $ | (117,083) |  | $ | 1,198,714 |
Contract Balances The nature of our primary revenue contracts provides an unconditional right to consideration upon service delivery; therefore, no customer contract assets or liabilities exist. The unconditional right to consideration is represented by the balance in our Accounts Receivable further discussed in Note 13.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 + Details
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