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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2025
Retirement Benefits [Abstract]  
Schedule of Pension Plan's funded status and amounts recognized in balance sheets and the components of net pension cost and accrued post-retirement liability
The following table sets forth the Pension Plan’s and post-retirement medical plan’s funded status and amounts recognized in Registrant’s balance sheets and the components of net pension cost and accrued liability at December 31, 2025 and 2024:
 Pension BenefitsPost-Retirement Medical
Benefits
(dollars in thousands)2025202420252024
Change in Projected Benefit Obligation:    
Projected benefit obligation at beginning of year$195,485 $202,963 $1,882 $1,965 
Service cost2,886 3,323 107 128 
Interest cost10,766 10,241 90 98 
Actuarial (gain) loss 1,943 (10,932)(132)(45)
Benefits/expenses paid(10,359)(10,110)(285)(264)
Projected benefit obligation at end of year$200,721 $195,485 $1,662 $1,882 
Changes in Plan Assets:    
Fair value of plan assets at beginning of year$217,162 $205,305 $14,456 $12,827 
Actual return on plan assets33,024 19,066 1,848 1,894 
Contributions3,424 2,902 272 256 
Benefits/expenses paid(10,360)(10,111)(557)(521)
Fair value of plan assets at end of year$243,250 $217,162 $16,019 $14,456 
Funded Status:    
Overfunded/(underfunded) amount recognized
$42,529 $21,677 $14,357 $12,574 
Pension BenefitsPost-Retirement
Medical Benefits
(dollars in thousands)2025202420252024
Amounts recognized on the balance sheets:    
Non-current assets$42,529 $21,677 $14,357 $12,574 
Current liabilities— — — — 
Non-current liabilities— — — — 
Net amount recognized$42,529 $21,677 $14,357 $12,574 
Amounts recognized in regulatory assets (liabilities) consist of:
    
Prior service cost (credit)$586 $1,020 $— $— 
Net loss (gain) (38,222)(19,867)(6,702)(6,531)
Regulatory assets (liabilities)(37,636)(18,847)(6,702)(6,531)
Prefunded plan costs
(4,893)(2,830)(7,655)(6,043)
Net liability (asset) recognized$(42,529)$(21,677)$(14,357)$(12,574)
Changes in plan assets and benefit obligations recognized in regulatory assets (liabilities):    
Regulatory asset (liability) at beginning of year$(18,847)$(445)$(6,531)$(6,272)
Net loss (gain)
(18,355)(17,968)(1,337)(1,371)
New prior service cost— — — — 
Amortization of prior service (cost) credit(434)(434)— — 
Amortization of net gain (loss)— — 1,166 1,112 
Total change in regulatory asset (liability)(18,789)(18,402)(171)(259)
Regulatory asset (liability) at end of year$(37,636)$(18,847)$(6,702)$(6,531)
Net periodic pension costs$1,361 $1,968 $(1,612)$(1,453)
Change in regulatory asset (liability)(18,789)(18,402)(171)(259)
Total recognized in net periodic pension cost and regulatory asset (liability)$(17,428)$(16,434)$(1,783)$(1,712)
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:    
Projected benefit obligation$200,721$195,485$1,662$1,882
Accumulated benefit obligation$191,661$186,679N/AN/A
Fair value of plan assets$243,250$217,162$16,019$14,456
Weighted-average assumptions used to determine benefit obligations at December 31:    
Discount rate5.57 %5.70 %4.93 %5.40 %
Rate of compensation increase**N/AN/A
*Age-graded ranging from 2.5% to 6.0%.
The following provides a reconciliation of benefit obligations, funded status of the SERP, as well as a summary of significant estimates at December 31, 2025 and 2024:
(dollars in thousands)20252024
Change in Benefit Obligation:  
Benefit obligation at beginning of year$34,758 $33,594 
Service cost722 1,430 
Interest cost1,941 1,706 
Actuarial loss (gain)
1,016 (1,028)
Benefits paid(942)(944)
Benefit obligation at end of year$37,495 $34,758 
Changes in Plan Assets:  
Fair value of plan assets at beginning and end of year— — 
Funded Status:  
Net amount recognized as accrued cost$(37,495)$(34,758)
(in thousands)20252024
Amounts recognized on the balance sheets:  
Current liabilities$(938)$(942)
Non-current liabilities(36,557)(33,816)
Net amount recognized$(37,495)$(34,758)
Amounts recognized in regulatory assets consist of:  
Prior service cost$— $— 
Net loss2,872 1,855 
Regulatory assets2,872 1,855 
Unfunded accrued cost34,623 32,903 
Net liability recognized$37,495 $34,758 
Changes in plan assets and benefit obligations recognized in regulatory assets consist of:  
Regulatory asset at beginning of year$1,855 $2,869 
Net (gain) loss
1,016 (1,028)
Amortization of prior service credit— — 
Amortization of net gain (loss)
1 14 
Total change in regulatory asset1,017 (1,014)
Regulatory asset at end of year$2,872 $1,855 
Net periodic pension cost$2,662 $3,122 
Change in regulatory asset1,017 (1,014)
Total recognized in net periodic pension and regulatory asset$3,679 $2,108 
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:  
Projected benefit obligation$37,495 $34,758 
Accumulated benefit obligation35,732 33,196 
Fair value of plan assets— — 
Weighted-average assumptions used to determine benefit obligations:  
Discount rate5.47 %5.66 %
Rate of compensation increase**
* Age graded from 4.0% to 4.5% per year.
Schedule of components of net periodic pension and post-retirement benefits cost, before allocation to the overhead pool
The components of net periodic pension and post-retirement benefits cost, before allocation to the overhead pool, for 2025, 2024 and 2023 are as follows:
Pension BenefitsPost-Retirement
 Medical Benefits
(dollars in thousands, except percent)202520242023202520242023
Components of Net Periodic Benefits Cost:      
Service cost$2,886$3,323$3,196$107$128$130
Interest cost10,76610,24110,1429098106
Expected return on plan assets(12,725)(12,030)(10,483)(643)(567)(477)
Amortization of prior service cost (credit)434434434———
Amortization of actuarial (gain) loss———(1,166)(1,112)(969)
Net periodic pension cost under accounting standards$1,361$1,968$3,289$(1,612)$(1,453)$(1,210)
Regulatory adjustment——(281)———
Total expense recognized, before surcharges and allocation to overhead pool$1,361$1,968$3,008$(1,612)$(1,453)$(1,210)
Weighted-average assumptions used to determine net periodic cost:       
Discount rate5.70 %5.16 %5.41 %5.40 %5.04 %5.34 %
Expected long-term return on plan assets6.00 %6.00 %5.75 %***
Rate of compensation increase******N/AN/AN/A
*5.75% for union plan and 4.0% for non-union (net of income taxes) in 2024 and 2025 and 5.50% for union plan and 3.9% for non-union (net of income taxes) in 2023.
 ** Age-graded ranging from 2.5% to 6.0%.
The components of SERP expense, before allocation to the overhead pool, for 2025, 2024 and 2023 are as follows:
(dollars in thousands, except percent)202520242023
Components of Net Periodic Benefits Cost:   
Service cost$722 $1,430 $1,248 
Interest cost1,941 1,706 1,644 
Amortization of net (gain) loss
(1)(14)(34)
Net periodic pension cost$2,662 $3,122 $2,858 
Weighted-average assumptions used to determine net periodic cost:   
Discount rate5.47 %5.15 %5.42 %
Rate of compensation increase***
* Age graded from 4.0% to 4.5% per year.
Schedule of actual allocation of plan assets
The Committee approves the target asset allocations.  Registrant’s pension and post-retirement plan weighted-average asset allocations at December 31, 2025 and 2024, by asset category are as follows:
Pension BenefitsPost-Retirement
Medical Benefits
Asset Category2025202420252024
Actual Asset Allocations:
    
Equity securities57 %56 %59 %59 %
Debt securities38 %39 %40 %40 %
Real Estate Funds5 %5 %— %— %
Cash equivalents— %— %1 %1 %
Total100 %100 %100 %100 %
Schedule of pension and post-retirement plan target asset allocations
Equity securities did not include AWR’s Common Shares as of December 31, 2025 and 2024.
Target Asset Allocations:Pension BenefitsPost-retirement
Medical Benefits
Equity securities60 %60 %
Debt securities40 %40 %
Total100 %100 %
Summary of fair value, measured by net asset value, of the pension investment assets
The following tables set forth the fair value, measured by net asset value, of the pension investment assets as of December 31, 2025 and 2024:
Net Asset Value as of December 31, 2025
(dollars in thousands)Fair ValueUnfunded CommitmentsRedemption FrequencyRedemption Notice Period
Cash equivalents$940 — N/AN/A
Fixed income fund93,569 — DailyDaily
Equity securities:
U.S. small/mid cap funds22,007 — DailyDaily
U.S. large cap funds59,843 — DailyDaily
International funds56,324 — DailyDaily
Total equity funds138,174 — 
Real estate funds10,567 — DailyDaily
Total$243,250 — 
Net Asset Value as of December 31, 2024
(dollars in thousands)Fair ValueUnfunded CommitmentsRedemption FrequencyRedemption Notice Period
Cash equivalents$939 — N/AN/A
Fixed income fund84,394 — DailyDaily
Equity securities:
U.S. small/mid cap funds21,324 — DailyDaily
U.S. large cap funds53,819 — DailyDaily
International funds46,486 — DailyDaily
Total equity funds121,629 
Real estate funds10,200 — DailyDaily
Total$217,162 — 
Schedule of pension and post-retirement plans' investment assets measured at fair value
The following tables set forth by level, within the fair value hierarchy, the post-retirement plan’s investment assets measured at fair value as of December 31, 2025 and 2024:
Fair Value as of December 31, 2025
(dollars in thousands)Level 1Level 2Level 3Total
Fair Value of Post-Retirement Plan Assets:    
Cash equivalents$188 — — $188 
Fixed income6,339 — — 6,339 
U.S. equity securities 9,492 — — 9,492 
Total investments measured at fair value$16,019 — — $16,019 
 
Fair Value as of December 31, 2024
(dollars in thousands)Level 1Level 2Level 3Total
Fair Value of Post-Retirement Plan Assets:    
Cash equivalents$110 — — $110 
Fixed income5,818 — — 5,818 
U.S. equity securities 8,528 — — 8,528 
Total investments measured at fair value$14,456 — — $14,456 
The following tables set forth by level, within the fair value hierarchy, the Rabbi Trust investment assets measured at fair value as of December 31, 2025 and 2024:
 
Fair Value as of December 31, 2025
(dollars in thousands)Level 1Level 2Level 3Total
Fair Value of Assets held in Rabbi Trust:    
Cash equivalents$16 — — $16 
Fixed income securities19,368 — — 19,368 
Equity securities29,027 — — 29,027 
Total investments measured at fair value$48,411 — — $48,411 
 
Fair Value as of December 31, 2024
(dollars in thousands)Level 1Level 2Level 3Total
Fair Value of Assets held in Rabbi Trust:    
Cash equivalents$11 — — $11 
Fixed income securities16,698 — — 16,698 
Equity securities24,478 — — 24,478 
Total investments measured at fair value$41,187 — — $41,187 
Schedule of estimated future benefit payments
Estimated future benefit payments at December 31, 2025 are as follows (in thousands):
 Pension Benefits
Post-Retirement
 Medical Benefits
2026$11,766 $284 
202712,267 257 
202812,825 236 
202913,467 177 
203013,872 177 
Thereafter72,940 584 
Total$137,137 $1,715 
Benefit Payments:  Estimated future benefit payments for the SERP at December 31, 2025 are as follows (in thousands):
2026$938 
20273,032 
20283,003 
20293,104 
20303,066 
Thereafter15,449 
Total$28,592