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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2022
Retirement Benefits [Abstract]  
Schedule of pension plan and other benefits plan The Company uses a December 31 measurement date for all of its employee benefit plans. The tables below set forth information relating to the Company’s Pension Plan and Other Benefits Plan for 2022 and 2021.
   (Thousands of Dollars)
   Pension Plan  Other Benefits Plan
   December 31,
   2022  2021  2022  2021
Change in Projected Benefit Obligation:                    
Beginning Balance  $113,710   $115,861   $49,396   $52,776 
Service Cost   2,362    2,696    799    917 
Interest Cost   3,042    2,706    1,325    1,236 
Actuarial (Gain) Loss   (27,850)   (4,185)   (17,761)   (4,705)
Benefits Paid   (3,476)   (3,368)   (850)   (828)
Ending Balance  $87,788   $113,710   $32,909   $49,396 

 
Schedule of change in fair value of plan assets
   (Thousands of Dollars)
   Pension Plan  Other Benefits Plan
   December 31,
   2022  2021  2022  2021
Change in Fair Value of Plan Assets:            
Beginning Balance  $100,750   $88,921   $50,668   $44,892 
Actual Return on Plan Assets   (14,346)   11,798    (6,639)   5,776 
Employer Contributions   1,900    3,400    850    828 
Benefits Paid   (3,476)   (3,369)   (850)   (828)
Ending Balance  $84,828   $100,750   $44,029   $50,668 
                     
Funded Status  $(2,960)  $(12,960)  $11,120   $1,272 
Schedule of employee benefit plans recognized in balance sheet
   (Thousands of Dollars)
   Pension Plan  Other Benefits Plan
   December 31,
   2022  2021  2022  2021
Amounts Recognized in the Consolidated                    
Balance Sheets consist of:                    
Current Liability  $529   $398   $
-
   $
-
 
Noncurrent Liability (Asset)   2,431    12,562    (11,120)   (1,272)
Net Liability (Asset) Recognized  $2,960   $12,960   $(11,120)  $(1,272)
Schedule of components of net benefit cost
   (Thousands of Dollars)
   Pension Plan  Other Benefits Plan
   Years Ended December 31,
   2022  2021  2020  2022  2021  2020
Components of Net Periodic Benefit Cost                  
Service Cost  $2,363   $2,696   $2,434   $799   $917   $993 
Interest Cost   3,042    2,706    3,099    1,325    1,236    1,699 
Expected Return on Plan Assets   (7,041)   (6,225)   (5,635)   (3,547)   (3,142)   (2,853)
Amortization of Net Actuarial Loss   1,673    2,868    2,059    
-
    527    1,352 
Net Periodic Benefit Cost*  $37   $2,045   $1,957   $(1,423)  $(462)  $1,191 

*Service cost is included in Operations and Maintenance expense on the consolidated statements of income; all other amounts are included in Other Income (Expense), net.
Schedule of regulatory assets into net periodic benefit cost Amounts that are expected to be amortized from Regulatory Assets into Net Periodic Benefit Cost in 2023 are as follows:
   (Thousands of Dollars)
  

 

Pension
Plan

  Other
 Benefits Plan
Actuarial Loss (Gain)  $658   $(191)

 
Schedule of discount and compensation rates The discount rate and compensation increase rate for determining our postretirement benefit plans’ benefit obligations and costs as of and for the years ended December 31, 2022, 2021 and 2020, respectively, are as follows:
   Pension Plan  Other Benefits Plan
   2022  2021  2020  2022  2021  2020
Weighted Average Assumptions:                              
Expected Return on Plan Assets   7.00%   7.00%   7.00%   7.00%   7.00%   7.00%
Discount Rate for:                              
Benefit Obligation   4.98%   2.72%   2.37%   4.98%   2.72%   2.37%
Benefit Cost   2.72%   2.37%   3.12%   2.72%   2.37%   3.12%
Compensation Increase for:                              
Benefit Obligation   3.00%   3.00%   3.00%   3.00%   3.00%   3.00%
Benefit Cost   3.00%   3.00%   3.00%   3.00%   3.00%   3.00%
Schedule of effect of one-percentage point change in assumed health care cost trend rates A one-percentage point change in assumed healthcare cost trend rates would have the following effects on the Other Benefits Plan:
   (Thousands of Dollars)
   1 Percentage Point
   Increase  Decrease
Effect on Current Year Service and Interest Costs  $435   $(334)
Effect on Projected Benefit Obligation  $4,239   $(3,448)
Schedule of expected benefit payments The following benefit payments, which reflect expected future service, are expected to be paid:
   (Thousands of Dollars)
Year  Pension Plan  Other Benefits Plan
2023     $4,153    $1,262 
2024   4,961    1,423 
2025   5,349    1,550 
2026   5,344    1,645 
2027   5,437    1,699 
2028-2032   28,483    9,363 
Totals  $53,727   $16,942 

 
Schedule of allocation of plan assets The allocation of plan assets at December 31, 2022 and 2021 by asset category is as follows:
   Pension Plan  Other Benefits Plan
Asset Category  2022  2021  Target  2022  2021  Target
Equity Securities   53.6%   59.6%   55%   55.2%   66.8%   43%
Debt Securities   40.9%   37.9%   38%   24.7%   30.7%   50%
Cash   3.9%   1.0%   2%   20.1%   2.5%   2%
Real Estate/Commodities   1.6%   1.5%   5%   0.0%   0.0%   5%
Total   100.0%   100.0%        100.0%   100.0%     
Schedule of fair value of plan assets The following tables present Middlesex’s Pension Plan assets measured and recorded at fair value within the fair value hierarchy:
   (Thousands of Dollars)
   As of December 31, 2022
   Level 1  Level 2  Level 3  Total
Mutual Funds  $71,559   $
-
   $
-
   $71,559 
Money Market Funds   3,271    
-
    
-
    3,271 
Common Equity Securities   9,998    
-
    
-
    9,998 
Total Investments  $84,828   $
-
   $
-
   $84,828 
   (Thousands of Dollars)
   As of December 31, 2021
   Level 1  Level 2  Level 3  Total
Mutual Funds  $87,687   $
-
   $
-
   $87,687 
Money Market Funds   1,057    
-
    
-
    1,057 
Common Equity Securities   12,006    
-
    
-
    12,006 
Total Investments  $100,750   $
-
   $
-
   $100,750 
   (Thousands of Dollars)
   As of December 31, 2022
   Level 1  Level 2  Level 3  Total
Mutual Funds  $23,660   $
-
   $
-
   $23,660 
Money Market Funds   8,623    
-
    
-
    8,623 
Agency/US/State/Municipal Debt   
-
    10,592    
-
    10,592 
Other   1,154    
-
    
-
    1,154 
Total Investments  $33,437   $10,592   $
-
   $44,029 
   (Thousands of Dollars)
   As of December 31, 2021
   Level 1  Level 2  Level 3  Total
Mutual Funds  $33,844   $
-
   $
-
   $33,844 
Money Market Funds   1,291    
-
    
-
    1,291 
Agency/US/State/Municipal Debt   
-
    15,533    
-
    15,533 
Total Investments  $35,135   $15,533   $
-
   $50,668 
Schedule of table presents awarded but not yet vested share The following table presents awarded but not yet vested share information for the plan:
   Shares(thousands)   Unearned
Compensation
(thousands)		   Weighted Average
Granted Price		 
Balance, January 1, 2020   97    1,706      
Granted   16    982   $60.12 
Vested   (27)   
-
      
Amortization of Compensation expense   
-
    (851)     
Balance, December 31, 2020   86    1,837      
Granted   15    1,151   $79.02 
Vested   (18)   
 
      
Amortization of Compensation expense   
-
    (1,057)     
Balance, December 31, 2021   83    1,931      
Granted   11    1,151   $105.17 
Vested   (17)   
-
      
Amortization of Compensation expense   
-
    (1,350)     
Balance, December 31, 2022   77   $1,732