Middlesex Water (MSEX) 10-Q 5 May 21 2021 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Document And Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2021
Entity File Number	0-422
Entity Registrant Name	MIDDLESEX WATER COMPANY
Entity Incorporation State Country Code	NJ
Entity Central Index Key	0000066004
Entity Tax Identification Number	22-1114430
Entity Address, Address Line One	485C Route One South
Entity Address, City or Town	Iselin
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	08830
City Area Code	732
Local Phone Number	634-1500
Title of 12(b) Security	Common Stock
Trading Symbol	MSEX
Name of Exchange on which Security is Registered	NASDAQ
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Reporting Status Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		17,478,462
Entity Interactive Data Current	Yes
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2021

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Operating Revenues	$ 32,541	$ 31,769
Operating Expenses:
Operations and Maintenance	18,356	17,192
Depreciation	4,832	4,448
Other Taxes	3,719	3,602
Total Operating Expenses	26,907	25,242
Operating Income	5,634	6,527
Other Income (Expense):
Allowance for Funds Used During Construction	1,263	1,123
Other Income (Expense), net	775	385
Total Other Income, net	2,038	1,508
Interest Charges	1,738	1,669
Income before Income Taxes	5,934	6,366
Income Taxes	(973)	(1,302)
Net Income	6,907	7,668
Preferred Stock Dividend Requirements	30	30
Earnings Applicable to Common Stock	$ 6,877	$ 7,638
Earnings per share of Common Stock:
Basic	$ 0.39	$ 0.44
Diluted	$ 0.39	$ 0.44
Average Number of Common Shares Outstanding:
Basic	17,476	17,437
Diluted	17,591	17,552

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
UTILITY PLANT:
Water Production	$ 173,375	$ 168,080
Transmission and Distribution	654,667	648,763
General	85,990	85,056
Construction Work in Progress	89,717	80,055
TOTAL	1,003,749	981,954
Less Accumulated Depreciation	188,565	185,356
UTILITY PLANT - NET	815,184	796,598
CURRENT ASSETS:
Cash and Cash Equivalents	4,046	4,491
Accounts Receivable, net of allowance for doubtful accounts of $2,183 and $2,053, respectively	12,709	14,569
Unbilled Revenues	7,210	7,065
Materials and Supplies (at average cost)	5,193	5,112
Prepayments	2,222	2,886
TOTAL CURRENT ASSETS	31,380	34,123
OTHER ASSETS:
Operating Lease Right of Use Asset	5,030	5,209
Preliminary Survey and Investigation Charges	5,923	5,192
Regulatory Assets	117,204	118,144
Restricted Cash	163	5,913
Non-utility Assets - Net	11,253	11,207
Other	73	84
TOTAL OTHER ASSETS	139,646	145,749
TOTAL ASSETS	986,210	976,470
CAPITALIZATION:
Common Stock, No Par Value	217,976	217,451
Retained Earnings	130,872	128,757
TOTAL COMMON EQUITY	348,848	346,208
Preferred Stock	2,084	2,084
Long-term Debt	272,664	273,244
TOTAL CAPITALIZATION	623,596	621,536
CURRENT LIABILITIES:
Current Portion of Long-term Debt	7,159	7,255
Notes Payable	13,000	2,000
Accounts Payable	24,414	30,443
Accrued Taxes	14,025	10,138
Accrued Interest	2,310	2,137
Unearned Revenues and Advanced Service Fees	1,237	1,255
Other	3,656	3,620
TOTAL CURRENT LIABILITIES	65,801	56,848
COMMITMENTS AND CONTINGENT LIABILITIES (Note 7)
OTHER LIABILITIES:
Customer Advances for Construction	23,290	23,404
Lease Obligations	4,872	5,042
Accumulated Deferred Income Taxes	61,474	61,297
Employee Benefit Plans	33,672	34,426
Regulatory Liabilities	58,565	60,792
Other	1,163	1,135
TOTAL OTHER LIABILITIES	183,036	186,096
CONTRIBUTIONS IN AID OF CONSTRUCTION	113,777	111,990
TOTAL CAPITALIZATION AND LIABILITIES	$ 986,210	$ 976,470

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Condensed Consolidated Balance Sheets Unaudited
Allowance for doubtful accounts	$ 2,183	$ 2,053

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 6,907	$ 7,668
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation and Amortization	6,296	5,108
Provision for Deferred Income Taxes and Investment Tax Credits	(2,359)	(3,430)
Equity Portion of Allowance for Funds Used During Construction (AFUDC)	(732)	(694)
Cash Surrender Value of Life Insurance	27	205
Stock Compensation Expense	203	162
Changes in Assets and Liabilities:
Accounts Receivable	1,860	1,085
Unbilled Revenues	(145)	481
Materials & Supplies	(81)	169
Prepayments	664	577
Accounts Payable	(6,029)	810
Accrued Taxes	3,887	3,530
Accrued Interest	173	(1,169)
Employee Benefit Plans	95	450
Unearned Revenue & Advanced Service Fees	(18)	(1)
Other Assets and Liabilities	(1,306)	1,187
NET CASH PROVIDED BY OPERATING ACTIVITIES	9,442	16,138
CASH FLOWS FROM INVESTING ACTIVITIES:
Utility Plant Expenditures, Including AFUDC of $531 in 2021, $429 in 2020	(22,033)	(25,147)
NET CASH USED IN INVESTING ACTIVITIES	(22,033)	(25,147)
CASH FLOWS FROM FINANCING ACTIVITIES:
Redemption of Long-term Debt	(1,324)	(1,330)
Proceeds from Issuance of Long-term Debt	687	5,398
Net Short-term Bank Borrowings	11,000	13,500
Deferred Debt Issuance Expense	(2)	(24)
Common Stock Issuance Expense		(37)
Proceeds from Issuance of Common Stock	322	313
Payment of Common Dividends	(4,762)	(4,468)
Payment of Preferred Dividends	(30)	(30)
Construction Advances and Contributions-Net	505	2,489
NET CASH PROVIDED BY FINANCING ACTIVITIES	6,396	15,811
NET CHANGES IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(6,195)	6,802
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD	10,404	46,499
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	4,209	53,301
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITY:
Utility Plant received as Construction Advances and Contributions	1,169	1,422
Cash Paid During the Year for:
Interest	1,726	3,022
Interest Capitalized	531	429
Income Taxes		$ 2

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Cash Flows [Abstract]
Allowance for funds used during construction	$ 531	$ 429

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Common Stock, No Par Value	$ 217,976	$ 217,451
Retained Earnings	130,872	128,757
TOTAL COMMON EQUITY	348,848	346,208
TOTAL PREFERRED STOCK	2,084	2,084
SUBTOTAL LONG-TERM DEBT	276,605	277,241
Add: Premium on Issuance of Long-term Debt	7,569	7,669
Less: Unamortized Debt Expense	(4,351)	(4,411)
Less: Current Portion of Long-term Debt	(7,159)	(7,255)
TOTAL LONG-TERM DEBT	272,664	273,244
Amortizing Secured Note, due December 20, 2021 [Member]
SUBTOTAL LONG-TERM DEBT	255	336
Amortizing Secured Note, due May 19, 2028 [Member]
SUBTOTAL LONG-TERM DEBT	3,010	3,115
Amortizing Secured Note, due August 25, 2030 [Member]
SUBTOTAL LONG-TERM DEBT	2,637	2,707
Amortizing Secured Note, due September 19, 2031 [Member]
SUBTOTAL LONG-TERM DEBT	2,917	2,987
State Revolving Trust Note, due December 31, 2022 [Member]
SUBTOTAL LONG-TERM DEBT	119	119
State Revolving Trust Note, due May 1, 2025 [Member]
SUBTOTAL LONG-TERM DEBT	1,170	1,170
State Revolving Trust Note, due March 1, 2026 [Member]
SUBTOTAL LONG-TERM DEBT	243	266
State Revolving Trust Note, due January 25, 2027 [Member]
SUBTOTAL LONG-TERM DEBT	286	307
State Revolving Trust Note, due December 1, 2026 [Member]
SUBTOTAL LONG-TERM DEBT	390	389
State Revolving Trust Bond 0.00%, due August 1, 2021 [Member]
SUBTOTAL LONG-TERM DEBT	10	11
State Revolving Trust Note, due July 1, 2028 [Member]
SUBTOTAL LONG-TERM DEBT	192	192
State Revolving Trust Note, due January 1, 2028 [Member]
SUBTOTAL LONG-TERM DEBT	62	62
State Revolving Trust Note, due August 1, 2031 [Member]
SUBTOTAL LONG-TERM DEBT	763	793
Amortizing Secured Note, due April 20, 2029 [Member]
SUBTOTAL LONG-TERM DEBT	2,819	2,907
Amortizing Secured Note 7.05%, due January 20, 2030 [Member]
SUBTOTAL LONG-TERM DEBT	2,208	2,271
Amortizing Secured Note 5.69%, due January 20, 2030 [Member]
SUBTOTAL LONG-TERM DEBT	4,530	4,658
Amortizing Secured Note, due April 20, 2040 [Member]
SUBTOTAL LONG-TERM DEBT	8,397	8,506
Amortizing Secured Note, due April 20, 2040 [Member]
SUBTOTAL LONG-TERM DEBT	3,116	3,156
State Revolving Trust Note, due July 1, 2031 [Member]
SUBTOTAL LONG-TERM DEBT	1,699	1,699
State Revolving Trust Note, due February 1, 2036 [Member]
SUBTOTAL LONG-TERM DEBT	934	961
State Revolving Trust Note, due November 1, 2038 [Member]
SUBTOTAL LONG-TERM DEBT	1,543	1,543
State Revolving Trust Note, due November 30, 2030 [Member]
SUBTOTAL LONG-TERM DEBT	883	883
Construction Loans [Member]
SUBTOTAL LONG-TERM DEBT	51,223	50,536
First Mortgage Bonds - Series BB [Member]
SUBTOTAL LONG-TERM DEBT	116	119
First Mortgage Bonds - Series CC [Member]
SUBTOTAL LONG-TERM DEBT	164	164
First Mortgage Bonds - Series EE [Member]
SUBTOTAL LONG-TERM DEBT	996	1,036
First Mortgage Bonds - Series FF [Member]
SUBTOTAL LONG-TERM DEBT	1,870	1,870
First Mortgage Bonds - Series GG [Member]
SUBTOTAL LONG-TERM DEBT	531	541
First Mortgage Bonds - Series HH [Member]
SUBTOTAL LONG-TERM DEBT	620	620
First Mortgage Bonds - Series II [Member]
SUBTOTAL LONG-TERM DEBT	326	338
First Mortgage Bonds - Series JJ [Member]
SUBTOTAL LONG-TERM DEBT	500	500
First Mortgage Bonds - Series KK [Member]
SUBTOTAL LONG-TERM DEBT	704	719
First Mortgage Bonds - Series LL [Member]
SUBTOTAL LONG-TERM DEBT	846	846
First Mortgage Bonds - Series MM [Member]
SUBTOTAL LONG-TERM DEBT	903	937
First Mortgage Bonds - Series NN [Member]
SUBTOTAL LONG-TERM DEBT	1,105	1,105
First Mortgage Bonds - Series OO [Member]
SUBTOTAL LONG-TERM DEBT	1,605	1,656
First Mortgage Bonds - Series PP [Member]
SUBTOTAL LONG-TERM DEBT	600	600
First Mortgage Bonds - Series QQ [Member]
SUBTOTAL LONG-TERM DEBT	9,915	9,915
First Mortgage Bonds - Series RR [Member]
SUBTOTAL LONG-TERM DEBT	22,500	22,500
First Mortgage Bonds - Series SS [Member]
SUBTOTAL LONG-TERM DEBT	23,000	23,000
First Mortgage Bonds - Series TT [Member]
SUBTOTAL LONG-TERM DEBT	1,756	1,806
First Mortgage Bonds - Series UU [Member]
SUBTOTAL LONG-TERM DEBT	705	705
First Mortgage Bonds - Series VV [Member]
SUBTOTAL LONG-TERM DEBT	1,813	1,861
First Mortgage Bonds - Series WW [Member]
SUBTOTAL LONG-TERM DEBT	715	715
First Mortgage Bonds - Series XX [Member]
SUBTOTAL LONG-TERM DEBT	10,121	10,247
First Mortgage Bonds - Series YY [Member]
SUBTOTAL LONG-TERM DEBT	3,710	3,710
0.00%, Series 2018A, due August 1, 2047 [Member]
SUBTOTAL LONG-TERM DEBT	6,167	6,246
3.00%-5.00%, Series 2018B, due August 1, 2047 [Member]
SUBTOTAL LONG-TERM DEBT	2,211	2,211
4.00%, Series 2019A, due August 1, 2059 [Member]
SUBTOTAL LONG-TERM DEBT	32,500	32,500
5.00%, Series 2019B, due August 1, 2059 [Member]
SUBTOTAL LONG-TERM DEBT	21,200	21,200
2.90%, Series 2020A, due November 18, 2050 [Member]
SUBTOTAL LONG-TERM DEBT	40,000	40,000
Convertible Preferred Stock $7.00 Series [Member]
TOTAL PREFERRED STOCK	1,005	1,005
Nonredeemable Preferred Stock $7.00 Series [Member]
TOTAL PREFERRED STOCK	79	79
Nonredeemable Preferred Stock $4.75 Series [Member]
TOTAL PREFERRED STOCK	$ 1,000	$ 1,000

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT (Unaudited) (Parenthetical) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Common Stock, Shares Authorized	40,000	40,000
Common Stock, Shares Outstanding	17,478	17,473
Preferred Stock, Shares Authorized	120	120
Preferred Stock, Shares Outstanding	20	20
Convertible Preferred Stock $7.00 Series [Member]
Preferred Stock, Shares Outstanding	10	10
Nonredeemable Preferred Stock $7.00 Series [Member]
Preferred Stock, Shares Outstanding	1	1
Nonredeemable Preferred Stock $4.75 Series [Member]
Preferred Stock, Shares Outstanding	10	10
Amortizing Secured Note, due December 20, 2021 [Member]
Interest rate	8.05%
Due date of debt	Dec. 20, 2021
Amortizing Secured Note, due May 19, 2028 [Member]
Interest rate	6.25%
Due date of debt	May 19, 2028
Amortizing Secured Note, due August 25, 2030 [Member]
Interest rate	6.44%
Due date of debt	Aug. 25, 2030
Amortizing Secured Note, due September 19, 2031 [Member]
Interest rate	6.46%
Due date of debt	Sep. 19, 2031
State Revolving Trust Note, due December 31, 2022 [Member]
Interest rate	4.22%
Due date of debt	Dec. 31, 2022
State Revolving Trust Note, due May 1, 2025 [Member]
Interest rate	3.60%
Due date of debt	May 1, 2025
State Revolving Trust Note, due March 1, 2026 [Member]
Interest rate	3.30%
Due date of debt	Mar. 1, 2026
State Revolving Trust Note, due January 25, 2027 [Member]
Interest rate	3.49%
Due date of debt	Jan. 25, 2027
State Revolving Trust Note, due December 1, 2026 [Member]
Interest rate	4.03%
Due date of debt	Dec. 1, 2026
State Revolving Fund Bond 0.00%, due August 1, 2021 [Member]
Interest rate	0.00%
Due date of debt	Aug. 1, 2021
State Revolving Trust Note, due July 1, 2028 [Member]
Interest rate	3.64%
Due date of debt	Jul. 1, 2028
State Revolving Trust Note, due January 1, 2028 [Member]
Interest rate	3.64%
Due date of debt	Jan. 1, 2028
State Revolving Trust Note, due August 1, 2031 [Member]
Interest rate	3.45%
Due date of debt	Aug. 1, 2031
Amortizing Secured Note, due April 20, 2029 [Member]
Interest rate	6.59%
Due date of debt	Apr. 20, 2029
Amortizing Secured Note 7.05%, due January 20, 2030 [Member]
Interest rate	7.05%
Due date of debt	Jan. 20, 2030
Amortizing Secured Note 5.69%, due January 20, 2030 [Member]
Interest rate	5.69%
Due date of debt	Jan. 20, 2030
Amortizing Secured Note, due April 20, 2040 [Member]
Interest rate	4.45%
Due date of debt	Apr. 20, 2040
Amortizing Secured Note, due April 20, 2040 [Member]
Interest rate	4.47%
Due date of debt	Apr. 20, 2040
State Revolving Trust Note, due July 1, 2031 [Member]
Interest rate	3.75%
Due date of debt	Jul. 1, 2031
State Revolving Trust Note, due February 1, 2036 [Member]
Interest rate	2.00%
Due date of debt	Feb. 1, 2036
State Revolving Trust Note, due November 1, 2038 [Member]
Interest rate	2.00%
Due date of debt	Nov. 1, 2038
State Revolving Trust Note, due November 30, 2030 [Member]
Interest rate	3.75%
Due date of debt	Nov. 30, 2030
First Mortgage Bonds - Series BB [Member]
Interest rate	0.00%
Due date of debt	Aug. 1, 2021
First Mortgage Bonds - Series CC [Member]
Due date of debt	Aug. 1, 2021
First Mortgage Bonds - Series CC [Member] | Minimum [Member]
Interest rate	4.00%
First Mortgage Bonds - Series CC [Member] | Maximum [Member]
Interest rate	5.00%
First Mortgage Bonds - Series EE [Member]
Interest rate	0.00%
Due date of debt	Aug. 1, 2023
First Mortgage Bonds - Series FF [Member]
Due date of debt	Aug. 1, 2024
First Mortgage Bonds - Series FF [Member] | Minimum [Member]
Interest rate	3.00%
First Mortgage Bonds - Series FF [Member] | Maximum [Member]
Interest rate	5.50%
First Mortgage Bonds - Series GG [Member]
Interest rate	0.00%
Due date of debt	Aug. 1, 2026
First Mortgage Bonds - Series HH [Member]
Due date of debt	Aug. 1, 2026
First Mortgage Bonds - Series HH [Member] | Minimum [Member]
Interest rate	4.00%
First Mortgage Bonds - Series HH [Member] | Maximum [Member]
Interest rate	5.00%
First Mortgage Bonds - Series II [Member]
Interest rate	0.00%
Due date of debt	Aug. 1, 2024
First Mortgage Bonds - Series JJ [Member]
Due date of debt	Aug. 1, 2027
First Mortgage Bonds - Series JJ [Member] | Minimum [Member]
Interest rate	3.40%
First Mortgage Bonds - Series JJ [Member] | Maximum [Member]
Interest rate	5.00%
First Mortgage Bonds - Series KK [Member]
Interest rate	0.00%
Due date of debt	Aug. 1, 2028
First Mortgage Bonds - Series LL [Member]
Due date of debt	Aug. 1, 2028
First Mortgage Bonds - Series LL [Member] | Minimum [Member]
Interest rate	5.00%
First Mortgage Bonds - Series LL [Member] | Maximum [Member]
Interest rate	5.50%
First Mortgage Bonds - Series MM [Member]
Interest rate	0.00%
Due date of debt	Aug. 1, 2030
First Mortgage Bonds - Series NN [Member]
Due date of debt	Aug. 1, 2030
First Mortgage Bonds - Series NN [Member] | Minimum [Member]
Interest rate	3.00%
First Mortgage Bonds - Series NN [Member] | Maximum [Member]
Interest rate	4.375%
First Mortgage Bonds - Series OO [Member]
Interest rate	0.00%
Due date of debt	Aug. 1, 2031
First Mortgage Bonds - Series PP [Member]
Due date of debt	Aug. 1, 2031
First Mortgage Bonds - Series PP [Member] | Minimum [Member]
Interest rate	2.00%
First Mortgage Bonds - Series PP [Member] | Maximum [Member]
Interest rate	5.00%
First Mortgage Bonds - Series QQ [Member]
Interest rate	5.00%
Due date of debt	Oct. 1, 2023
First Mortgage Bonds - Series RR [Member]
Interest rate	3.80%
Due date of debt	Oct. 1, 2038
First Mortgage Bonds - Series SS [Member]
Interest rate	4.25%
Due date of debt	Oct. 1, 2047
First Mortgage Bonds - Series TT [Member]
Interest rate	0.00%
Due date of debt	Aug. 1, 2032
First Mortgage Bonds - Series UU [Member]
Due date of debt	Aug. 1, 2032
First Mortgage Bonds - Series UU [Member] | Minimum [Member]
Interest rate	3.00%
First Mortgage Bonds - Series UU [Member] | Maximum [Member]
Interest rate	3.25%
First Mortgage Bonds - Series VV [Member]
Interest rate	0.00%
Due date of debt	Aug. 1, 2033
First Mortgage Bonds - Series WW [Member]
Due date of debt	Aug. 1, 2033
First Mortgage Bonds - Series WW [Member] | Minimum [Member]
Interest rate	3.00%
First Mortgage Bonds - Series WW [Member] | Maximum [Member]
Interest rate	5.00%
First Mortgage Bonds - Series XX [Member]
Interest rate	0.00%
Due date of debt	Aug. 1, 2047
First Mortgage Bonds - Series YY [Member]
Due date of debt	Aug. 1, 2047
First Mortgage Bonds - Series YY [Member] | Minimum [Member]
Interest rate	3.00%
First Mortgage Bonds - Series YY [Member] | Maximum [Member]
Interest rate	5.00%
0.00%, Series 2018A, due August 1, 2047 [Member]
Interest rate	0.00%
Due date of debt	Aug. 1, 2047
3.00%-5.00%, Series 2018B, due August 1, 2047 [Member]
Due date of debt	Aug. 1, 2047
3.00%-5.00%, Series 2018B, due August 1, 2047 [Member] | Minimum [Member]
Interest rate	3.00%
3.00%-5.00%, Series 2018B, due August 1, 2047 [Member] | Maximum [Member]
Interest rate	5.00%
4.00%, Series 2019A, due August 1, 2059 [Member]
Interest rate	4.00%
Due date of debt	Aug. 1, 2059
5.00%, Series 2019B, due August 1, 2059 [Member]
Interest rate	5.00%
Due date of debt	Aug. 1, 2059
2.90%, Series 2020A, due November 18, 2050 [Member]
Interest rate	2.90%
Due date of debt	Nov. 18, 2050
Construction Loans [Member]
Interest rate	0.00%

CONDENSED CONSOLIDATED STATEM_6

CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2019	$ 215,125	$ 108,667	$ 323,792
Balance, shares at Dec. 31, 2019	17,434
Net Income		7,668	7,668
Dividend Reinvestment & Common Stock Purchase Plan	$ 313		313
Dividend Reinvestment & Common Stock Purchase Plan, shares	5
Restricted Stock Award, Net - Employees	$ 162		162
Cash Dividends on Common Stock		(4,468)	(4,468)
Cash Dividends on Preferred Stock		(30)	(30)
Common Stock Expenses		(37)	(37)
Balance at Mar. 31, 2020	$ 215,600	111,800	327,400
Balance, shares at Mar. 31, 2020	17,439
Balance at Dec. 31, 2020	$ 217,451	128,757	346,208
Balance, shares at Dec. 31, 2020	17,473
Net Income		6,907	6,907
Dividend Reinvestment & Common Stock Purchase Plan	$ 322		322
Dividend Reinvestment & Common Stock Purchase Plan, shares	5
Restricted Stock Award, Net - Employees	$ 203		203
Cash Dividends on Common Stock		(4,762)	(4,762)
Cash Dividends on Preferred Stock		(30)	(30)
Balance at Mar. 31, 2021	$ 217,976	$ 130,872	$ 348,848
Balance, shares at Mar. 31, 2021	17,478

CONDENSED CONSOLIDATED STATEM_7

CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Cash dividends paid, per share	$ 0.2725	$ 0.2563

Basis of Presentation and Recen

Basis of Presentation and Recent Developments	3 Months Ended
	Mar. 31, 2021
Basis of Presentation and Recent Developments [Abstract]
Basis of Presentation and Recent Developments	Note 1 – Basis of Presentation and Recent Developments Middlesex Water Company (Middlesex or the Company) is the parent company and sole shareholder of Tidewater Utilities, Inc. (Tidewater), Tidewater Environmental Services, Inc. (TESI), Pinelands Water Company (Pinelands Water) and Pinelands Wastewater Company (Pinelands Wastewater) (collectively, Pinelands), Utility Service Affiliates, Inc. (USA), and Utility Service Affiliates (Perth Amboy) Inc. (USA-PA). Southern Shores Water Company, LLC (Southern Shores) and White Marsh Environmental Systems, Inc. (White Marsh) are wholly-owned subsidiaries of Tidewater. The financial statements for Middlesex and its wholly-owned subsidiaries are reported on a consolidated basis. All significant intercompany accounts and transactions have been eliminated. The consolidated notes within the 2020 Annual Report on Form 10-K (the 2020 Form 10-K) are applicable to these financial statements and, in the opinion of the Company, the accompanying unaudited condensed consolidated financial statements contain all adjustments necessary (including normal recurring accruals) to present fairly the financial position as of March 31, 2021 and the results of operations and cash flows for the three month periods ended March 31, 2021 and 2020. Information included in the Condensed Consolidated Balance Sheet as of December 31, 2020, has been derived from the Company’s December 31, 2020 audited financial statements included in the 2020 Form 10-K. Recent Developments Loan Agreement - Short Term Borrowings Middlesex Financing Petition – Novel Coronavirus (COVID-19) The NJBPU and the Delaware Public Service Commission (DEPSC) have approved the tracking of COVID-19 related incremental costs for potential recovery in customer rates in future rate proceedings. Neither jurisdiction has established a timetable or definitive formal procedures for seeking cost recovery. Since the issuance of the SEOs, the Company has increased its allowance for doubtful accounts for expected increases in accounts receivable write-offs due to the financial impact of COVID-19 on customers. We will continue to monitor the effects of COVID-19 and evaluate its impact on the Company’s business, results of operations, financial condition and liquidity. 6 Index Recent Accounting Guidance There is no new adopted or proposed accounting guidance that the Company is aware of that could have a material impact on the Company’s financial statements.

Rate and Regulatory Matters

Rate and Regulatory Matters	3 Months Ended
	Mar. 31, 2021
Regulated Operations [Abstract]
Rate and Regulatory Matters	Note 2 Rate and Regulatory Matters Middlesex – Tidewater - In March 2021, Tidewater was notified by the DEPSC that it had determined Tidewater’s earned rate of return exceeded the rate of return authorized by the DEPSC. Consequently, Tidewater reset its DSIC rate to zero effective April 1, 2021 and is refunding customers, with interest, in the form of an account credit for DSIC revenue billed between April 1, 2020 and March 31, 2021. Accordingly, in March 2021, Tidewater recorded a $0.8 million reserve, net of tax, for such refunds. Tidewater expects to apply the account credits in the second quarter of 2021. Twin Lakes Utilities, Inc. (Twin Lakes) - Twin Lakes remains under the operation of a large PAPUC regulated investor-owned water utility as the receiver, which had been appointed by the PAPUC under an Order effective January 15, 2021. The receivership is to remain in place until the final outcome of the Section 529 proceeding. It is unknown at this time if the PAPUC will affirm or deny the Recommended Decision in whole, or in part. Separate from the disposition of this matter by the PAPUC, or any further litigation which may proceed beyond the PAPUC’s final decision, the financial results, total assets and financial obligations of Twin Lakes are not material to Middlesex.

Capitalization

Capitalization	3 Months Ended
	Mar. 31, 2021
CAPITALIZATION:
Capitalization	Note 3 – Capitalization Common Stock - 7 Index Long-term Debt - Middlesex currently has two projects that are in the construction loan phase of the New Jersey SRF program: 1) In April 2018, the NJBPU approved Middlesex’s request to participate in the NJIB loan program to fund the construction of a 4.5 mile large-diameter transmission pipeline from the Carl J. Olsen water treatment plant in Edison, New Jersey and interconnect with our distribution system. Middlesex closed on a $43.5 million NJIB interest-free construction loan in August 2018. Through March 31, 2021, Middlesex has drawn a total of $42.6 million and expects to draw any remaining funding requests on this construction loan in the second quarter of 2021. 2) In March 2018, the NJBPU approved Middlesex’s request to participate in the NJIB loan program to fund the 2018 RENEW Program, which is an ongoing initiative to eliminate unlined water distribution mains in the Middlesex system. Middlesex closed on an $8.7 million NJIB construction loan in September 2018 and completed withdrawal of the proceeds in October 2019. The Company anticipates that these two construction loans will be converted into long-term securitized loans by the NJIB during the fourth quarter of 2021. In May 2020, Middlesex received approval from the NJBPU to borrow up to $100 million, in one or more private placement transactions through December 31, 2023 to help fund Middlesex’s multi-year capital construction program. In November 2020, Middlesex closed on a $40 million private placement loan with a payment maturity date of November 2050 As part of its ongoing comprehensive financing plan, Middlesex received approval from the NJBPU in February 2019 to issue and sell up to $140 million of FMBs through the New Jersey Economic Development Authority (NJEDA) in one or more transactions through December 31, 2022. Because the interest paid to the bondholders is exempt from federal and New Jersey income taxes, the interest rate on debt issued through the NJEDA is generally lower than otherwise achievable in the traditional taxable corporate bond market. However, the interest received by the bondholder is subject to the Alternative Minimum Tax. In August 2019, Middlesex priced and closed on a NJEDA debt financing transaction of $53.7 million by issuing FMBs designated as Series 2019A ($32.5 million at coupon interest rate of 4.0%) and Series 2019B ($21.2 million at coupon interest rate of 5.0%). The proceeds, including an issuance premium of $7.1 million, were used to finance several projects under the Water For Tomorrow capital program initiated by the Company to upgrade and replace aging water utility infrastructure. The proceeds were initially recorded as Restricted Cash on the balance sheet and held in escrow by a bond trustee. Funds were drawn down by requisition for the qualifying projects as costs were incurred with the final requisition made in February 2021. 8 Index Fair Value of Financial Instruments - March 31, 2021 December 31, 2020 Carrying Fair Carrying Fair Amount Value Amount Value Bonds $ 147,209 $ 159,764 $ 147,667 $ 159,195 For other long-term debt for which there was no quoted market price and there is not an active trading market, it was not practicable to estimate their fair value (for details, including carrying value, interest rate and due date on these series of long-term debt, please refer to those series noted as “Amortizing Secured Note”, “State Revolving Trust Note”, “State Revolving Trust Bond”, “Construction Loans” and “Series 2020A” on the Condensed Consolidated Statements of Capital Stock and Long-Term Debt). The carrying amount of these instruments was $129.4 million and $129.6 million at March 31, 2021 and December 31, 2020, respectively. Customer advances for construction have carrying amounts of $23.3 million and $23.4 million at March 31, 2021 and 2020, respectively. Their relative fair values cannot be accurately estimated since future refund payments depend on several variables, including new customer connections, customer consumption levels and future rate increases.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Share	Note 4 – Earnings Per Share Basic earnings per share (EPS) are computed on the basis of the weighted average number of shares outstanding during the period presented. Diluted EPS assumes the conversion of the Convertible Preferred Stock $7.00 Series. (In Thousands Except per Share Amounts) Three Months Ended March 31, 2021 2020 Basic: Income Shares Income Shares Net Income $ 6,907 17,476 $ 7,668 17,437 Preferred Dividend (30 ) (30 ) Earnings Applicable to Common Stock $ 6,877 17,476 $ 7,638 17,437 Basic EPS $ 0.39 $ 0.44 Diluted: Earnings Applicable to Common Stock $ 6,877 17,476 $ 7,638 17,437 $7.00 Series Preferred Dividend 17 115 17 115 Adjusted Earnings Applicable to Common Stock $ 6,894 17,591 $ 7,655 17,552 Diluted EPS $ 0.39 $ 0.44

Business Segment Data

Business Segment Data	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Business Segment Data	Note 5 – Business Segment Data The Company has identified two reportable segments. One is the regulated business of collecting, treating and distributing water on a retail and wholesale basis to residential, commercial, industrial and fire protection customers in parts of New Jersey and Delaware. This segment also includes regulated wastewater systems in New Jersey and Delaware. The Company is subject to regulations as to its rates, services and other matters by New Jersey and Delaware with respect to utility services within these states. The other segment is primarily comprised of non-regulated contract services for the operation and maintenance of municipal and private water and wastewater systems in New Jersey and Delaware. Inter-segment transactions relating to operational costs are treated as pass-through expenses. Finance charges on inter-segment loan activities are based on interest rates that are below what would normally be charged by a third party lender. (In Thousands) Three Months Ended March 31, Operations by Segments: 2021 2020 Revenues: Regulated $ 29,421 $ 28,937 Non – Regulated 3,257 2,961 Inter-segment Elimination (137 ) (129 ) Consolidated Revenues $ 32,541 $ 31,769 Operating Income: Regulated $ 4,716 $ 5,843 Non – Regulated 918 684 Consolidated Operating Income $ 5,634 $ 6,527 Net Income: Regulated $ 6,240 $ 7,181 Non – Regulated 667 487 Consolidated Net Income $ 6,907 $ 7,668 Capital Expenditures: Regulated $ 21,963 $ 24,968 Non – Regulated 70 179 Total Capital Expenditures $ 22,033 $ 25,147 As of As of March 31, December 31, 2021 2020 Assets: Regulated $ 1,004,405 $ 998,932 Non – Regulated 7,918 8,289 Inter-segment Elimination (26,113 ) (30,751 ) Consolidated Assets $ 986,210 $ 976,470

Short-term Borrowings

Short-term Borrowings	3 Months Ended
	Mar. 31, 2021
Short-term Debt [Abstract]
Short-term Borrowings	Note 6 – Short-term Borrowings The Company maintains lines of credit aggregating $110.0 million. (Millions) As of March 31, 2020 Outstanding Available Maximum Credit Type Renewal Date Bank of America $ - $ 30.0 $ 30.0 Uncommitted January 27, 2022 PNC Bank 10.0 58.0 68.0 Committed January 31, 2023 CoBank 3.0 9.0 12.0 Committed November 30, 2023 $ 13.0 $ 97.0 $ 110.0 The interest rate for borrowings under the lines of credit is set using the London InterBank Offered Rate (LIBOR) and adding a credit spread, which varies by financial institution. There is no requirement for a compensating balance under any of the established lines of credit. Each of the lines of credit includes a provision for a replacement benchmark for when LIBOR is fully phased-out and no longer available to set the interest rate on borrowings under these lines of credit. The weighted average interest rate on the outstanding borrowings at March 31, 2021 under these credit lines is 1.09%. The weighted average daily amounts of outstanding borrowings under the Company’s credit lines and the weighted average interest rates on those amounts were $8.0 million and $21.4 million at 1.12% and 2.58% for the three months ended March 31, 2021 and 2020, respectively. The maturity dates for the $13.0 million outstanding as of March 31, 2021 were in April 2021 and were extended at the discretion of the Company.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Note 7 – Commitments and Contingent Liabilities Water Supply - Middlesex has an agreement with a non-affiliated regulated water utility for the purchase of treated water. This agreement, which expires February 27, 2026, provides for the minimum purchase of 3.0 mgd of treated water with provisions for additional purchases. Tidewater contracts with the City of Dover, Delaware to purchase 15.0 million gallons of treated water annually. Purchased water costs are shown below: (In Thousands) Three Months Ended March 31, 2021 2020 Treated $ 877 $ 793 Untreated 861 870 Total Costs $ 1,738 $ 1,663 11 Index Guarantees - In November 2019, Middlesex was notified that the County terminated its Agreement with the Contractor. The Contractor had initiated legal action against the County that in part contests the County’s exercise of this termination. The County filed a counter-claim against the Contractor’s parent company and has brought Middlesex into the suit as a third-party defendant. We continue to monitor this litigation; however, given the cancellation of the underlying operating contract by the County and the continuation of the litigation matter, we do not anticipate having to perform under the guaranty nor do we anticipate the ultimate outcome will have a material impact on the Company’s results of operations or financial condition. Leases - The Company has entered into an operating lease of office space for administrative purposes, expiring in 2030. The Company has not entered into any finance leases. The exercise of a lease renewal option for the Company’s administrative offices is solely at the discretion of the Company. The right-of-use (ROU) asset recorded represents the Company’s right to use an underlying asset for the lease term and lease liability represents the Company’s obligation to make lease payments arising from the lease. Lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. The Company’s operating lease does not provide an implicit discount rate and as such the Company used an estimated incremental borrowing rate (4.03%) based on the information available at commencement date in determining the present value of lease payments. Given the impacts of accounting for regulated operations, and the resulting recognition of expense at the amounts recovered in customer rates, expenditures for operating leases are consistent with lease expense and were $0.2 million for each of the three months ended March 31, 2021 and 2020, respectively. Information related to operating lease ROU assets and lease liabilities is as follows: (In Millions) As of March 31, 2021 December 31, 2020 ROU Asset at Lease Inception $ 7.3 $ 7.3 Accumulated Amortization (2.3 ) (2.1 ) Current ROU Asset $ 5.0 $ 5.2 12 Index The Company’s future minimum operating lease commitments as of March 31, 2021 are as follows: (In Millions) 2021 $ 0.6 2022 0.8 2023 0.8 2024 0.8 2025 0.8 Thereafter 3.6 Total Lease Payments $ 7.4 Imputed Interest (1.8 ) Present Value of Lease Payments 5.6 Less Current Portion* (0.7 ) Non-Current Lease Liability $ 4.9 *Included in Other Current Liabilities Construction - Contingencies - Change in Control Agreements -

Employee Benefit Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Employee Benefit Plans	Note 8 – Employee Benefit Plans Pension Benefits Other Postretirement Benefits - 13 Index The following table sets forth information relating to the Company’s periodic costs for its employee retirement benefit plans: (In Thousands) Pension Benefits Other Benefits Three Months Ended March 31, 2021 2020 2021 2020 Service Cost $ 674 $ 609 $ 229 $ 248 Interest Cost 677 775 309 425 Expected Return on Assets (1,556 ) (1,409 ) (786 ) (721 ) Amortization of Unrecognized Losses 717 515 132 338 Net Periodic Benefit Cost (Benefit)* $ 512 $ 490 $ (116 ) $ 290 *Service cost is included in Operations and Maintenance expense on the Condensed Consolidated Statements of Income; all other amounts are included in Other Income/Expense, net.

Revenue Recognition from Contra

Revenue Recognition from Contracts with Customers	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenue Recognition from Contracts with Customers	Note 9 – Revenue Recognition from Contracts with Customers The Company’s revenues are primarily generated from regulated tariff-based sales of water and wastewater services and non-regulated operation and maintenance contracts for services on water and wastewater systems owned by others. Revenue from contracts with customers is recognized when control of a promised good or service is transferred to customers at an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. The Company’s regulated revenue from contracts with customers is derived from tariff-based sales that result from the obligation to provide water and wastewater services to residential, industrial, commercial, fire-protection and wholesale customers. The Company’s residential customers are billed quarterly while most of the Company’s industrial, commercial, fire-protection and wholesale customers are billed monthly. Payments by customers are due between 15 and 30 days after the invoice date. The Company recognizes revenue as the water and wastewater services are delivered to customers, as well as records unbilled revenues estimated from the last meter reading date to the end of the accounting period utilizing factors such as historical customer data, regional weather indicators and general economic conditions in its service territories. Unearned Revenues and Advance Service Fees include fixed service charge billings in advance of service provided to Tidewater customers and are recognized as service is provided. Non-regulated service contract revenues consist of base service fees, as well as fees for additional billable services provided to customers. Fees are billed monthly and are due within 30 days after the invoice date. The Company considers the amounts billed to represent the value of these services provided to customers. These contracts expire at various times through June 2030 and contain remaining performance obligations for which the Company expects to recognize revenue in the future. These contracts also contain termination provisions. Almost all of the amounts included in operating revenues and accounts receivable are from contracts with customers. The Company records its allowance for doubtful accounts based on historical write-offs combined with an evaluation of current economic conditions within its service territories. The Company’s contracts do not contain any significant financing components. 14 Index The Company’s operating revenues are comprised of the following: (In Thousands) Three Months Ended March 31, 2021 2020 Regulated Tariff Sales Residential $ 16,957 $ 16,681 Commercial 3,576 3,369 Industrial 2,177 2,081 Fire Protection 3,104 3,045 Wholesale 3,539 3,698 Non-Regulated Contract Operations 3,151 2,859 Total Revenue from Contracts with Customers $ 32,504 $ 31,733 Other Regulated Revenues 68 62 Other Non-Regulated Revenues 106 103 Inter-segment Elimination (137 ) (129 ) Total Revenue $ 32,541 $ 31,769

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Note 10 – Income Taxes The Company’s federal income tax returns for the tax years 2014 through 2017 were selected for examination by the Internal Revenue Service (IRS), which included the tax year in which the Company had adopted the final IRS tangible property regulations and changed its accounting method for the tax treatment of expenditures that qualified as deductible repairs. As a result of the audit examination, the Company agreed to certain modifications of its accounting method for expenditures that qualify as deductible repairs. In 2019, the Company paid $2.7 million in income taxes and $0.1 million in interest in connection with the conclusion of the 2014 through 2017 federal income tax return audits. As of March 31, 2021, the Company has reduced its income tax reserve provision and interest expense liability to $0.5 million and $0.2 million, respectively.

Capitalization (Tables)

Capitalization (Tables)	3 Months Ended
	Mar. 31, 2021
CAPITALIZATION:
Schedule of carrying amount and fair value of bonds	Fair Value of Financial Instruments - March 31, 2021 December 31, 2020 Carrying Fair Carrying Fair Amount Value Amount Value Bonds $ 147,209 $ 159,764 $ 147,667 $ 159,195

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Schedule of earnings per share	Basic earnings per share (EPS) are computed on the basis of the weighted average number of shares outstanding during the period presented. Diluted EPS assumes the conversion of the Convertible Preferred Stock $7.00 Series. (In Thousands Except per Share Amounts) Three Months Ended March 31, 2021 2020 Basic: Income Shares Income Shares Net Income $ 6,907 17,476 $ 7,668 17,437 Preferred Dividend (30 ) (30 ) Earnings Applicable to Common Stock $ 6,877 17,476 $ 7,638 17,437 Basic EPS $ 0.39 $ 0.44 Diluted: Earnings Applicable to Common Stock $ 6,877 17,476 $ 7,638 17,437 $7.00 Series Preferred Dividend 17 115 17 115 Adjusted Earnings Applicable to Common Stock $ 6,894 17,591 $ 7,655 17,552 Diluted EPS $ 0.39 $ 0.44

Business Segment Data (Tables)

Business Segment Data (Tables)	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Schedule of segment reporting information, by segment	The Company has identified two reportable segments. One is the regulated business of collecting, treating and distributing water on a retail and wholesale basis to residential, commercial, industrial and fire protection customers in parts of New Jersey and Delaware. This segment also includes regulated wastewater systems in New Jersey and Delaware. The Company is subject to regulations as to its rates, services and other matters by New Jersey and Delaware with respect to utility services within these states. The other segment is primarily comprised of non-regulated contract services for the operation and maintenance of municipal and private water and wastewater systems in New Jersey and Delaware. Inter-segment transactions relating to operational costs are treated as pass-through expenses. Finance charges on inter-segment loan activities are based on interest rates that are below what would normally be charged by a third party lender. (In Thousands) Three Months Ended March 31, Operations by Segments: 2021 2020 Revenues: Regulated $ 29,421 $ 28,937 Non – Regulated 3,257 2,961 Inter-segment Elimination (137 ) (129 ) Consolidated Revenues $ 32,541 $ 31,769 Operating Income: Regulated $ 4,716 $ 5,843 Non – Regulated 918 684 Consolidated Operating Income $ 5,634 $ 6,527 Net Income: Regulated $ 6,240 $ 7,181 Non – Regulated 667 487 Consolidated Net Income $ 6,907 $ 7,668 Capital Expenditures: Regulated $ 21,963 $ 24,968 Non – Regulated 70 179 Total Capital Expenditures $ 22,033 $ 25,147 As of As of March 31, December 31, 2021 2020 Assets: Regulated $ 1,004,405 $ 998,932 Non – Regulated 7,918 8,289 Inter-segment Elimination (26,113 ) (30,751 ) Consolidated Assets $ 986,210 $ 976,470

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	3 Months Ended
	Mar. 31, 2021
Short-term Debt [Abstract]
Schedule of Line of Credit	The Company maintains lines of credit aggregating $110.0 million. (Millions) As of March 31, 2020 Outstanding Available Maximum Credit Type Renewal Date Bank of America $ - $ 30.0 $ 30.0 Uncommitted January 27, 2022 PNC Bank 10.0 58.0 68.0 Committed January 31, 2023 CoBank 3.0 9.0 12.0 Committed November 30, 2023 $ 13.0 $ 97.0 $ 110.0

Commitments and Contingent Li_2

Commitments and Contingent Liabilities (Tables)	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Schedule of purchased water cost	Purchased water costs are shown below: (In Thousands) Three Months Ended March 31, 2021 2020 Treated $ 877 $ 793 Untreated 861 870 Total Costs $ 1,738 $ 1,663
Schedule of operating lease ROU assets and lease liabilities	Information related to operating lease ROU assets and lease liabilities is as follows: (In Millions) As of March 31, 2021 December 31, 2020 ROU Asset at Lease Inception $ 7.3 $ 7.3 Accumulated Amortization (2.3 ) (2.1 ) Current ROU Asset $ 5.0 $ 5.2
Schedule of future minimum operating lease	The Company’s future minimum operating lease commitments as of March 31, 2021 are as follows: (In Millions) 2021 $ 0.6 2022 0.8 2023 0.8 2024 0.8 2025 0.8 Thereafter 3.6 Total Lease Payments $ 7.4 Imputed Interest (1.8 ) Present Value of Lease Payments 5.6 Less Current Portion* (0.7 ) Non-Current Lease Liability $ 4.9 *Included in Other Current Liabilities

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Schedule of periodic costs for employee retirement benefit plan	The following table sets forth information relating to the Company’s periodic costs for its employee retirement benefit plans: (In Thousands) Pension Benefits Other Benefits Three Months Ended March 31, 2021 2020 2021 2020 Service Cost $ 674 $ 609 $ 229 $ 248 Interest Cost 677 775 309 425 Expected Return on Assets (1,556 ) (1,409 ) (786 ) (721 ) Amortization of Unrecognized Losses 717 515 132 338 Net Periodic Benefit Cost (Benefit)* $ 512 $ 490 $ (116 ) $ 290

Revenue Recognition from Cont_2

Revenue Recognition from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Schedule of Operating Revenue	The Company’s operating revenues are comprised of the following: (In Thousands) Three Months Ended March 31, 2021 2020 Regulated Tariff Sales Residential $ 16,957 $ 16,681 Commercial 3,576 3,369 Industrial 2,177 2,081 Fire Protection 3,104 3,045 Wholesale 3,539 3,698 Non-Regulated Contract Operations 3,151 2,859 Total Revenue from Contracts with Customers $ 32,504 $ 31,733 Other Regulated Revenues 68 62 Other Non-Regulated Revenues 106 103 Inter-segment Elimination (137 ) (129 ) Total Revenue $ 32,541 $ 31,769

Basis of Presentation and Rec_2

Basis of Presentation and Recent Developments (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Feb. 28, 2021	Mar. 31, 2021
ACB (CoBank) [Member]
Line of Credit Facility [Line Items]
Debt Current		$ 20
Debt instrument increase decrease for period net		$ 0.1
Debt instrument term		25 years
New Jersey Board Of Public Utilities [Member]
Line of Credit Facility [Line Items]
Repayments of first mortgage bond	$ 45.5

Rate and Regulatory Matters (De

Rate and Regulatory Matters (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Tidewater [Member]
Regulatory Liabilities [Line Items]
Proceeds from net of tax refunds	$ 0.8
New Jersey Board Of Public Utilities [Member] | Middlesex [Member]
Regulatory Liabilities [Line Items]
Approved increase in annual operating revenues	1.1
Pennsylvania Public Utilities Commissio [Member] | Twin Lakes [Member]
Regulatory Liabilities [Line Items]
Escrow account	$ 1.7
Delaware Public Service Commission Member | Tidewater [Member]
Regulatory Liabilities [Line Items]
Approved increase in annual operating revenues		$ 0.6

Capitalization (Narrative) (Det

Capitalization (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended			3 Months Ended
	Nov. 30, 2020	Aug. 31, 2019	Feb. 28, 2019	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	May 31, 2020	Sep. 30, 2018	Aug. 31, 2018
Schedule of Capitalization [Line Items]
Other long term debt				$ 129.4		$ 129.6
Customer advances for construction				$ 23.3	$ 23.4
First Mortgage Bonds [Member]
Schedule of Capitalization [Line Items]
Maximum borrowing capacity, construction loan		$ 53.7
Series 2019A [Member]
Schedule of Capitalization [Line Items]
Maximum borrowing capacity, construction loan		$ 32.5
Interest rate		4.00%
Series 2019B [Member]
Schedule of Capitalization [Line Items]
Maximum borrowing capacity, construction loan		$ 21.2
Interest rate		5.00%
New Jersey Economic Development Authority [Member]
Schedule of Capitalization [Line Items]
Debt Instrument Maturity Date			Dec. 31, 2022
Proceeds from issuance of first mortgage bond			$ 140
New Jersey NJIB Program [Member]
Schedule of Capitalization [Line Items]
Maximum borrowing capacity, construction loan								$ 8.7
New Jersey Infrastructure Bank [Member]
Schedule of Capitalization [Line Items]
Maximum borrowing capacity, construction loan									$ 43.5
Percentage of principal with stated interest rate				0.00%
Percentage of principal with market interest rate				0.00%
Middlesex [Member]
Schedule of Capitalization [Line Items]
Maximum borrowing amount				$ 42.6
Proceeds from private placement	$ 40
Middlesex [Member] | New Jersey Board Of Public Utilities [Member]
Schedule of Capitalization [Line Items]
Maximum borrowing amount							$ 100
FMB [Member]
Schedule of Capitalization [Line Items]
Percentage of principal with stated interest rate	2.90%
Debt Instrument Maturity Date	Nov. 30, 2050
First Mortgage Bonds [Member]
Schedule of Capitalization [Line Items]
Proceeds from issuance premium		$ 7.1
Middlesex Water Company Investment Plan [Member]
Schedule of Capitalization [Line Items]
Proceeds amount				$ 0.3	$ 0.3
Issuance of common stock				5,000	5,000

Capitalization (Schedule of Car

Capitalization (Schedule of Carrying Amount and Fair Value of Bonds) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
First Mortgage Bonds	$ 147,209	$ 147,667
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
First Mortgage Bonds	$ 159,764	$ 159,195

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Basic:
Net Income	$ 6,907	$ 7,668
Preferred Dividend	(30)	(30)
Earnings Applicable to Common Stock	$ 6,877	$ 7,638
Basic EPS	$ 0.39	$ 0.44
Weighted average number of basic shares outstanding	17,476	17,437
Diluted:
Adjusted Earnings Applicable to Common Stock	$ 6,894	$ 7,655
Diluted EPS	$ 0.39	$ 0.44
Weighted average number of diluted shares outstanding	17,591	17,552
Convertible Preferred Stock $7.00 Series [Member]
Diluted:
Preferred Dividend	$ 17	$ 17
Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock (in shares)	115	115

Business Segment Data (Details)

Business Segment Data (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments	2
Operating Revenues	$ 32,541	$ 31,769
Operating Income	5,634	6,527
Net Income	6,907	7,668
Capital Expenditures	22,033	25,147
Assets	986,210		$ 976,470
Regulated [Member]
Segment Reporting Information [Line Items]
Operating Revenues	29,421	28,937
Operating Income	4,716	5,843
Net Income	6,240	7,181
Capital Expenditures	21,963	24,968
Assets	1,004,405		998,932
Non - Regulated [Member]
Segment Reporting Information [Line Items]
Operating Revenues	3,257	2,961
Operating Income	918	684
Net Income	667	487
Capital Expenditures	70	179
Assets	7,918		8,289
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Operating Revenues	(137)	$ (129)
Assets	$ (26,113)		$ (30,751)

Short-term Borrowings (Narrativ

Short-term Borrowings (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Line of Credit Facility [Line Items]
Weighted average interest rate on outstanding borrowings	1.09%
Average Daily Amounts Outstanding	$ 8	$ 21.4
Weighted Average Interest Rates	1.12%	2.58%

Short-term Borrowings (Schedule

Short-term Borrowings (Schedule of Line of Credit) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)
Line of Credit Facility [Line Items]
Outstanding	$ 13
Available	97
Maximum	110
Bank of America [Member]
Line of Credit Facility [Line Items]
Outstanding
Available	30
Maximum	$ 30
Credit Type	Uncommitted
Renewal Date	Jan. 27, 2022
PNC Bank [Member]
Line of Credit Facility [Line Items]
Outstanding	$ 10
Available	58
Maximum	$ 68
Credit Type	Committed
Renewal Date	Jan. 31, 2023
CoBank [Member]
Line of Credit Facility [Line Items]
Outstanding	$ 3
Available	9
Maximum	$ 12
Credit Type	Committed
Renewal Date	Nov. 30, 2023

Commitments and Contingent Li_3

Commitments and Contingent Liabilities (Narrative) (Details) gal in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)gal	Mar. 31, 2020USD ($)
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Budgeted construction cost for construction program, 2020 | $	$ 121
Contractual construction agreements | $	17
Rental expenses under operating leases | $	$ 0.2	$ 0.2
Estimated incremental borrowing rate	4.03%
NJ Water Supply Authority [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase commitment expiration date of contract	Nov. 30, 2023
Water purchase per commitment | gal	27
Regulated Water Authority [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase commitment expiration date of contract	Feb. 27, 2026
Water purchase per commitment | gal	3
City of Dover [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Water purchase per commitment | gal	15

Commitments and Contingent Li_4

Commitments and Contingent Liabilities (Schedule of Purchased Water Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Purchased Water
Treated	$ 877	$ 793
Untreated	861	870
Total Costs	$ 1,738	$ 1,663

Commitments and Contingent Li_5

Commitments and Contingent Liabilities (Schedule of Operating Lease ROU Assets and Lease Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
ROU Asset at Lease Inception	$ 7.3	$ 7.3
Accumulated Amortization	(2.3)	(2.1)
Current ROU Asset	$ 5	$ 5.2

Commitments and Contingent Li_6

Commitments and Contingent Liabilities (Schedule of Future Minimum Operating Lease) (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Minimum Lease Payments, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]
2021		$ 600
2022		800
2023		800
2024		800
2025		800
Thereafter		3,600
Total Lease Payments		7,400
Imputed Interest		(1,800)
Present Value of Lease Payments		5,600
Less Current Portion	[1]	(700)
Non-Current Lease Liability		$ 4,872	$ 5,042
[1]	Included in Other Current Liabilities

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Annual benefits paid to retired participants	$ 0.4
Other Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benfit plan, cash contributions	3.4	$ 0.3
Pension Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected cash contributions	$ 0.8

Employee Benefit Plans (Schedul

Employee Benefit Plans (Schedule of Benefits Plans) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Pension Benefit Plan [Member]
Periodic costs for employee retirement benefit plans
Service Cost		$ 674	$ 609
Interest Cost		677	775
Expected Return on Assets		(1,556)	(1,409)
Amortization of Unrecognized Losses		717	515
Net Periodic Benefit Cost (Benefit)	[1]	512	490
Other Benefits Plan [Member]
Periodic costs for employee retirement benefit plans
Service Cost		229	248
Interest Cost		309	425
Expected Return on Assets		(786)	(721)
Amortization of Unrecognized Losses		132	338
Net Periodic Benefit Cost (Benefit)	[1]	$ (116)	$ 290
[1]	Service cost is included in Operations and Maintenance expense on the Condensed Consolidated Statements of Income; all other amounts are included in Other Income/Expense, net.

Revenue Recognition from Cont_3

Revenue Recognition from Contracts with Customers (Schedule of Operating Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Regulated Tariff Sales
Residential	$ 16,957	$ 16,681
Commercial	3,576	3,369
Industrial	2,177	2,081
Fire Protection	3,104	3,045
Wholesale	3,539	3,698
Non-Regulated Contract Operations	3,151	2,859
Total Revenue from Contracts with Customers	32,504	31,733
Other Regulated Revenues	68	62
Other Non-Regulated Revenues	106	103
Inter-segment Elimination	(137)	(129)
Total Revenue	$ 32,541	$ 31,769

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax paid		$ 2.7
Interest paid		$ 0.1
Reduce in income tax reserve provision	$ 0.5
Interest expense liability	$ 0.2