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Segment Information
 6 Months Ended
Jun. 30, 2023
Segment Reporting [Abstract]  
Segment Information SEGMENT INFORMATION
We primarily operate in one reportable business segment, which is NW Natural's local gas distribution business and is referred to as the NGD segment. NW Natural and NW Holdings also have investments and business activities not specifically related to the NGD segment, which are aggregated and reported as other and described below for each entity.

Natural Gas Distribution
NW Natural's local gas distribution segment is a regulated utility principally engaged in the purchase, sale, and delivery of natural gas and related services to customers in Oregon and southwest Washington. In addition to NW Natural's local gas distribution business, the NGD segment also includes the portion of the Mist underground storage facility used to serve NGD customers, the North Mist gas storage expansion in Oregon, NWN Gas Reserves, which is a wholly-owned subsidiary of Energy Corp, and NW Natural RNG Holding Company, LLC, a holding company established to invest in the development and procurement of regulated renewable natural gas for NW Natural.

NW Natural
NW Natural's activities in Other include Interstate Storage Services and third-party asset management services, appliance retail center operations, and corporate operating and non-operating revenues and expenses that cannot be allocated to NGD operations.

Earnings from Interstate Storage Services assets are primarily related to firm storage capacity revenues. Earnings from third-party asset management services also include revenue, net of amounts shared with NGD customers, from management of NGD assets at Mist and upstream pipeline capacity when not needed to serve NGD customers. Under the Oregon sharing mechanism, NW Natural retains 80% of the pre-tax income from these services when the costs of the capacity were not included in NGD rates, or 10% of the pre-tax income when the costs have been included in these rates. The remaining 20% and 90%, respectively, are recorded to a deferred regulatory account for crediting back to NGD customers.

NW Holdings
NW Holdings' activities in Other include all remaining activities not associated with NW Natural, specifically: NW Natural Water Company, LLC (NW Natural Water or NWN Water), which consolidates the water and wastewater utility operations and is pursuing other investments in the water and wastewater sector through itself and wholly-owned subsidiaries; NW Natural Water's equity investment in Avion Water Company, Inc.; NWN Gas Storage, a wholly-owned subsidiary of NWN Energy; other pipeline assets in NNG Financial; and NW Natural Renewables Holdings, LLC (NW Natural Renewables) and its non-regulated renewable natural gas activities. Other also includes corporate revenues and expenses that cannot be allocated to other operations, including certain business development activities.

Segment Information Summary
Inter-segment transactions were immaterial for the periods presented. The following table presents summary financial information concerning the reportable segment and other.
Three Months Ended June 30,
In thousandsNGDOther
(NW Natural)		NW NaturalOther
(NW Holdings)		NW Holdings
2023
Operating revenues$223,714 $4,634 $228,348 $9,511 $237,859 
Depreciation29,623 257 29,880 1,413 31,293 
Income (loss) from operations10,390 2,912 13,302 541 13,843 
Net income (loss)(271)2,055 1,784 (540)1,244 
Capital expenditures65,215 485 65,700 7,898 73,598 
2022
Operating revenues$184,634 $5,617 $190,251 $4,709 $194,960 
Depreciation27,062 266 27,328 782 28,110 
Income (loss) from operations10,575 3,550 14,125 (586)13,539 
Net income (loss)157 2,576 2,733 (1,018)1,715 
Capital expenditures91,122 750 91,872 7,310 99,182 
Six Months Ended June 30,
In thousandsNGDOther
(NW Natural)		NW NaturalOther
(NW Holdings)		NW Holdings
2023
Operating revenues$671,484 $11,377 $682,861 $17,421 $700,282 
Depreciation59,481 543 60,024 2,734 62,758 
Income (loss) from operations119,549 7,881 127,430 (79)127,351 
Net income (loss)71,680 5,644 77,324 (4,409)72,915 
Capital expenditures128,857 441 129,298 15,565 144,863 
Total assets at June 30, 20234,176,376 53,538 4,229,914 306,791 4,536,705 
2022
Operating revenues$526,032 $10,843 $536,875 $8,386 $545,261 
Depreciation54,435 530 54,965 1,574 56,539 
Income (loss) from operations96,238 6,438 102,676 (1,499)101,177 
Net income (loss)55,547 4,602 60,149 (2,195)57,954 
Capital expenditures155,402 787 156,189 11,507 167,696 
Total assets at June 30, 20223,875,237 54,760 3,929,997 170,521 4,100,518 
Total assets at December 31, 20224,392,699 60,019 4,452,718 295,608 4,748,326 

Natural Gas Distribution Margin
NGD margin is the primary financial measure used by the Chief Operating Decision Maker (CODM), consisting of NGD operating revenues, reduced by the associated cost of gas, environmental remediation expense, and revenue taxes. The cost of gas purchased for NGD customers is generally a pass-through cost in the amount of revenues billed to regulated NGD customers. Environmental remediation expense represents collections received from customers through environmental recovery mechanisms in Oregon and Washington as well as adjustments for the Oregon environmental earnings test when applicable. This is offset by environmental remediation expense presented in operating expenses. Revenue taxes are collected from NGD customers and remitted to taxing authorities. The collections from customers are offset by the expense recognition of the obligation to the taxing authority. By subtracting cost of gas, environmental remediation expense, and revenue taxes from NGD operating revenues, NGD margin provides a key metric used by the CODM in assessing the performance of the NGD segment.

The following table presents additional segment information concerning NGD margin:
Three Months Ended June 30,Six Months Ended June 30,
In thousands2023202220232022
NGD margin calculation:
NGD distribution revenues$218,988 $179,727 $662,049 $516,214 
Other regulated services4,726 4,907 9,435 9,818 
Total NGD operating revenues223,714 184,634 671,484 526,032 
Less: NGD cost of gas102,490 79,776 308,295 225,420 
          Environmental remediation2,140 2,272 7,515 6,970 
 Revenue taxes9,159 8,208 28,134 21,532 
NGD margin$109,925 $94,378 $327,540 $272,110