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Revenue (Tables) | 9 Months Ended
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Sep. 30, 2025
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue | The following presents our operating revenues from external customers, in total and by amounts arising from contracts with customers and alternative revenue program (ARP) arrangements, disaggregated by revenue source and segment for the three and nine months ended September 30, 2025 and 2024:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2025 |  | 2024 |  | 2025 |  | 2024
Operating Revenues |  |  |  |  |  |  |
Electric Segment |  |  |  |  |  |  |
Retail: Residential | $ | 32,106 |  |  | $ | 34,150 |  |  | $ | 104,939 |  |  | $ | 99,971 |
Retail: Commercial and Industrial | 77,507 |  |  | 74,602 |  |  | 244,105 |  |  | 225,827 |
Retail: Other | 2,029 |  |  | 2,050 |  |  | 6,100 |  |  | 5,875 |
Total Retail | 111,642 |  |  | 110,802 |  |  | 355,144 |  |  | 331,673 |
Transmission | 14,934 |  |  | 15,152 |  |  | 40,297 |  |  | 39,805 |
Wholesale | 10,379 |  |  | 3,139 |  |  | 16,418 |  |  | 8,273 |
Other | 1,642 |  |  | 1,287 |  |  | 5,189 |  |  | 4,945 |
Total Electric Segment | 138,597 |  |  | 130,380 |  |  | 417,048 |  |  | 384,696 |
Manufacturing Segment |  |  |  |  |  |  |
Metal Parts and Tooling | 67,649 |  |  | 69,904 |  |  | 207,868 |  |  | 245,972 |
Plastic Products and Tooling | 7,710 |  |  | 8,537 |  |  | 24,255 |  |  | 23,989 |
Scrap Metal | 1,592 |  |  | 1,455 |  |  | 5,240 |  |  | 6,000 |
Total Manufacturing Segment | 76,951 |  |  | 79,896 |  |  | 237,363 |  |  | 275,961 |
Plastics Segment |  |  |  |  |  |  |
PVC Pipe | 110,015 |  |  | 127,757 |  |  | 341,548 |  |  | 366,780 |
Total Operating Revenue | 325,563 |  |  | 338,033 |  |  | 995,959 |  |  | 1,027,437 |
Less: Non-contract Revenues Included Above |  |  |  |  |  |  |
Electric Segment - ARP Revenues | (323) |  |  | 647 |  |  | 305 |  |  | 413 |
Total Operating Revenues from Contracts with Customers | $ | 325,886 |  |  | $ | 337,386 |  |  | $ | 995,654 |  |  | $ | 1,027,024 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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