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Pay vs Performance Disclosure
 12 Months Ended
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Pay vs Performance Disclosure [Table]      
Pay vs Performance [Table Text Block]
YearCEO Summary Compensation Table Total $CEO Compensation Actually Paid $Other NEOs Average Summary Compensation Table Total $Other NEOs Average Compensation Actually Paid $Value of fixed $100 Initial Investment Based on:Company Net Income ($ in millions)Company-Selected Financial Measure (EPS)
Company TSR $Peer Group TSR $
2022(1,2)
6,294,923 7,011,717 1,550,687 1,695,306 88 111 233 $2.60
2021(3,4)
5,408,355 7,834,404 1,280,247 1,605,540 95 114 244 $2.72
2020(5,6)
3,510,132 1,898,352 1,165,917 798,448 77 99 155 $1.88
    
Company Selected Measure Name Earnings per Share    
Named Executive Officers, Footnote [Text Block] Other named executive officers (NEOs) other than the CEO, who was Ms. Pope for 2022 were as follows: James Ajello, Senior Vice President, Finance, Chief Financial Officer, Treasurer and Corporate Compliance Officer; Angelica Espinosa, Vice President, General Counsel; Larry Bekkedahl, Senior Vice President, Advanced Energy Delivery and John Kochavatr, Vice President, Customer & Digital Solutions and Chief Information Officer.Other NEOs other than the CEO, who was ms. Pope, for 2021 were as follows: James Ajello, Senior Vice President, Finance, Chief Financial Officer and Treasurer; Lisa Kaner, Vice President, General Counsel and Corporate Compliance Officer, who retired July 1, 2022; Larry Bekkedahl, Senior Vice President, Advanced Energy Delivery and John Kochavatr, Vice President Information Technology and Chief Information Officer.Other named executive officers other than the CEO, who was Ms. Pope, for 2020 were as follows: James Lobdell, Senior Vice President, Finance, Chief Financial Officer and Treasurer, who retired on December 31, 2020; Lisa Kaner, Vice President, General Counsel and Corporate Compliance Officer, who retired July 1, 2022; John Kochavatr, Vice President Information Technology and Chief Information Officer and Larry Bekkedahl, Senior Vice President, Grid Architecture and System Operations    
PEO Total Compensation Amount $ 6,294,923 $ 5,408,355 $ 3,510,132
PEO Actually Paid Compensation Amount $ 7,011,717 7,834,404 1,898,352
Adjustment To PEO Compensation, Footnote [Text Block] Amounts in columns "CEO Compensation Actually Paid $" and "Other NEOs Average Compensation Actually Paid $" represent "compensation actually paid" as computed in accordance with Regulation S-K Item 402(v) in the year 2022. The dollar amounts do not reflect the actual amounts of compensation earned by or paid to the CEO and the other NEOs during the applicable year. The fair value, at the end of the year, of equity awards granted during the year that remain unvested at year-end for the CEO was $4,845,196 and average of the other named executive officers was $814,782. There were no equity awards that were granted and vested during the year for the CEO and an average of $23,508 for the other named executive officers. The change in fair value, during the year, of unvested equity awards at the beginning of the year that remain unvested at year-end for the CEO was ($412,824) and an average of ($4,495) for the other named executive officers. The change in fair value, during the current year, of unvested equity awards at the beginning of the year that vested during the year was $123,787 for the CEO and an average of $1,412 for the other named executive officers. Change in value for pension service cost for the CEO was $42,963 and no other named executive officers participated in the pension. No forfeitures or prior year awards that failed to vest during the current year existed for either. Dividends are not paid on unvested shares.Amounts in columns "CEO Compensation Actually Paid $" and "Other NEOs Average Compensation Actually Paid $" represent "compensation actually paid" as computed in accordance with Regulation S-K Item 402(v) in the year 2021. The dollar amounts do not reflect the actual amounts of compensation earned by or paid to the CEO and the other NEOs during the applicable year. The fair value, at the end of the year, of equity awards granted during the year that remain unvested at year-end for the CEO was $4,353,630 and average of the other named executive officers was $676,535. There were no equity awards that were granted and vested during the year. The change in fair value, during the year, of unvested equity awards at the beginning of the year that remain unvested at year-end for the CEO was $1,168,382 and an average of $121,828 for the other named executive officers. The change in fair value, during the current year, of unvested equity awards at the beginning of the year that vested during the year was $47,216 for the CEO and an average of $18,391 for the other named executive officers. Change in value for pension service cost for the CEO was $12,918 and no other named executive officers participated in the pension. No forfeitures or prior year awards that failed to vest during the current year existed for either. Dividends are not paid on unvested shares.Amounts in columns "CEO Compensation Actually Paid $" and "Other NEOs Average Compensation Actually Paid $" represent "compensation actually paid" as computed in accordance with Regulation S-K Item 402(v) in the year 2020. The dollar amounts do not reflect the actual amounts of compensation earned by or paid to the CEO and the other NEOs during the applicable year. The fair value, at the end of the year, of equity awards granted during the year that remain unvested at year-end for the CEO was $2,065,903 and average of the other named executive officers was $379,274. There were no equity awards that were granted and vested during the year. The change in fair value, during the year, of unvested equity awards at the beginning of the year that remain unvested at year-end for the CEO was ($1,343,749) and an average of ($309,758) for the other named executive officers. The change in fair value, during the current year, of unvested equity awards at the beginning of the year that vested during the year was $107,035 for the CEO and an average of $53,533 for the other named executive officers. Change in value for pension service cost for the CEO was ($115,718) and an average of ($66,590) for the other named executive officers. No forfeitures or prior year awards that failed to vest during the current year existed for either. Dividends are not paid on unvested shares. Amount shown in "Company-Selected Financial Measure (EPS)" is adjusted for COVID-19 impacts, as disclosed in the 2021 proxy; the unadjusted result was $1.72 per diluted share.    
Non-PEO NEO Average Total Compensation Amount $ 1,550,687 1,280,247 1,165,917
Non-PEO NEO Average Compensation Actually Paid Amount $ 1,695,306 1,605,540 798,448
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Amounts in columns "CEO Compensation Actually Paid $" and "Other NEOs Average Compensation Actually Paid $" represent "compensation actually paid" as computed in accordance with Regulation S-K Item 402(v) in the year 2022. The dollar amounts do not reflect the actual amounts of compensation earned by or paid to the CEO and the other NEOs during the applicable year. The fair value, at the end of the year, of equity awards granted during the year that remain unvested at year-end for the CEO was $4,845,196 and average of the other named executive officers was $814,782. There were no equity awards that were granted and vested during the year for the CEO and an average of $23,508 for the other named executive officers. The change in fair value, during the year, of unvested equity awards at the beginning of the year that remain unvested at year-end for the CEO was ($412,824) and an average of ($4,495) for the other named executive officers. The change in fair value, during the current year, of unvested equity awards at the beginning of the year that vested during the year was $123,787 for the CEO and an average of $1,412 for the other named executive officers. Change in value for pension service cost for the CEO was $42,963 and no other named executive officers participated in the pension. No forfeitures or prior year awards that failed to vest during the current year existed for either. Dividends are not paid on unvested shares.Amounts in columns "CEO Compensation Actually Paid $" and "Other NEOs Average Compensation Actually Paid $" represent "compensation actually paid" as computed in accordance with Regulation S-K Item 402(v) in the year 2021. The dollar amounts do not reflect the actual amounts of compensation earned by or paid to the CEO and the other NEOs during the applicable year. The fair value, at the end of the year, of equity awards granted during the year that remain unvested at year-end for the CEO was $4,353,630 and average of the other named executive officers was $676,535. There were no equity awards that were granted and vested during the year. The change in fair value, during the year, of unvested equity awards at the beginning of the year that remain unvested at year-end for the CEO was $1,168,382 and an average of $121,828 for the other named executive officers. The change in fair value, during the current year, of unvested equity awards at the beginning of the year that vested during the year was $47,216 for the CEO and an average of $18,391 for the other named executive officers. Change in value for pension service cost for the CEO was $12,918 and no other named executive officers participated in the pension. No forfeitures or prior year awards that failed to vest during the current year existed for either. Dividends are not paid on unvested shares.Amounts in columns "CEO Compensation Actually Paid $" and "Other NEOs Average Compensation Actually Paid $" represent "compensation actually paid" as computed in accordance with Regulation S-K Item 402(v) in the year 2020. The dollar amounts do not reflect the actual amounts of compensation earned by or paid to the CEO and the other NEOs during the applicable year. The fair value, at the end of the year, of equity awards granted during the year that remain unvested at year-end for the CEO was $2,065,903 and average of the other named executive officers was $379,274. There were no equity awards that were granted and vested during the year. The change in fair value, during the year, of unvested equity awards at the beginning of the year that remain unvested at year-end for the CEO was ($1,343,749) and an average of ($309,758) for the other named executive officers. The change in fair value, during the current year, of unvested equity awards at the beginning of the year that vested during the year was $107,035 for the CEO and an average of $53,533 for the other named executive officers. Change in value for pension service cost for the CEO was ($115,718) and an average of ($66,590) for the other named executive officers. No forfeitures or prior year awards that failed to vest during the current year existed for either. Dividends are not paid on unvested shares. Amount shown in "Company-Selected Financial Measure (EPS)" is adjusted for COVID-19 impacts, as disclosed in the 2021 proxy; the unadjusted result was $1.72 per diluted share.    
Compensation Actually Paid vs. Total Shareholder Return [Text Block] por-20230306_g80.jpg    
Compensation Actually Paid vs. Net Income [Text Block] por-20230306_g81.jpg    
Compensation Actually Paid vs. Company Selected Measure [Text Block] por-20230306_g82.jpg    
Total Shareholder Return Vs Peer Group [Text Block] por-20230306_g79.jpg    
Tabular List [Table Text Block]
The financial and non-financial performance measures listed below represent the most important metrics we used to link compensation actually paid for 2022 for our PEO and other named executives (as further described in our Compensation Discussion and Analysis (C&DA).
Performance Metrics SelectedRelationship to pay
Earnings per Share Annual cash incentive plan
Earnings per share growthLong-term incentive plan
Return on equity as a percentage of allowed return on equityLong-term incentive plan
DecarbonizationLong-term incentive plan
    
Total Shareholder Return Amount $ 88 95 77
Peer Group Total Shareholder Return Amount 111 114 99
Net Income (Loss) $ 233,000,000 $ 244,000,000 $ 155,000,000
Company Selected Measure Amount | $ / shares 2.60 2.72 1.88
PEO Name Ms. Pope    
Company Selected Measure Amount, Unadjusted | $ / shares     1.72
Measure [Axis]: 1      
Pay vs Performance Disclosure [Table]      
Measure Name Earnings per Share    
Measure [Axis]: 2      
Pay vs Performance Disclosure [Table]      
Measure Name Earnings per share growth    
Measure [Axis]: 3      
Pay vs Performance Disclosure [Table]      
Measure Name Return on equity as a percentage of allowed return on equity    
Measure [Axis]: 4      
Pay vs Performance Disclosure [Table]      
Measure Name Decarbonization    
PEO [Member] | Adjustment, Equity Awards Granted During Year, Unvested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ 4,845,196 $ 4,353,630 $ 2,065,903
PEO [Member] | Adjustment, Equity Awards Granted During the Year, Vested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 0
PEO [Member] | Adjustment, Equity Awards Granted in Prior Years, Unvested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (412,824) 1,168,382 (1,343,749)
PEO [Member] | Adjustment, Equity Awards Granted in Prior Years, Vested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 123,787 47,216 107,035
PEO [Member] | Adjustment, Pension Service Cost [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 42,963 12,918 (115,718)
PEO [Member] | Adjustment, Forfeitures Or Prior Year Awards That Failed To Vest During Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 0
Non-PEO NEO [Member] | Adjustment, Equity Awards Granted During Year, Unvested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 814,782 676,535 379,274
Non-PEO NEO [Member] | Adjustment, Equity Awards Granted During the Year, Vested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 23,508 0 0
Non-PEO NEO [Member] | Adjustment, Equity Awards Granted in Prior Years, Unvested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (4,495) 121,828 (309,758)
Non-PEO NEO [Member] | Adjustment, Equity Awards Granted in Prior Years, Vested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 1,412 18,391 53,533
Non-PEO NEO [Member] | Adjustment, Pension Service Cost [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 (66,590)
Non-PEO NEO [Member] | Adjustment, Forfeitures Or Prior Year Awards That Failed To Vest During Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ 0 $ 0 $ 0