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Statements of Consolidated Balance Sheets - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Property, Plant and Equipment    
Plant $ 37,201.7 $ 34,152.9
Accumulated depreciation and amortization (9,201.6) (8,699.0)
Net Property, Plant and Equipment [1] 28,000.1 25,453.9
Investments and Other Assets    
Unconsolidated affiliates 7.7 6.5
Available-for-sale debt securities (amortized cost of $160.4 and $91.9, allowance for credit losses of $0.1 and $0.1, respectively) 159.0 86.7
Other investments 116.2 85.5
Total Investments and Other Assets 282.9 178.7
Current Assets    
Cash and cash equivalents 95.0 156.6
Restricted Cash 24.5 42.0
Accounts receivable 719.6 987.9
Allowance for credit losses (18.6) (23.7)
Accounts receivable, net 701.0 964.2
Gas storage 268.3 179.6
Materials and supplies, at average cost 183.3 173.3
Electric production fuel, at average cost 23.7 36.2
Exchange gas receivable 42.9 45.7
Regulatory assets 326.5 319.9
Prepayments and other 25.6 24.2
Total Current Assets [1] 1,848.2 2,080.2
Other Assets    
Regulatory assets 2,132.9 2,157.4
Goodwill 1,485.9 1,485.9
Deferred charges and other 652.9 432.0
Total Other Assets 4,271.7 4,075.3
Total Assets 34,402.9 31,788.1
Stockholders' Equity    
Common stock - $0.01 par value,750,000,000 shares authorized; 477,136,079 and 469,822,472 shares outstanding, respectively 4.8 4.7
Treasury stock (99.9) (99.9)
Additional paid-in capital 9,798.3 9,521.5
Retained deficit (572.0) (711.7)
Accumulated other comprehensive loss (13.0) (30.4)
Total NiSource Stockholders’ Equity 9,118.2 8,684.2
Noncontrolling interest in consolidated subsidiaries 2,123.6 1,984.1
Total Stockholders’ Equity 11,241.8 10,668.3
Long-term debt, excluding amounts due within one year 14,472.1 12,074.5
Total Capitalization 25,713.9 22,742.8
Current Liabilities    
Current portion of long-term debt 31.3 1,281.2
Short-term borrowings 1,260.0 604.6
Accounts payable 712.0 863.1
Dividends payable - common stock 137.4 0.0
Customer deposits and credits 273.5 268.8
Taxes accrued 179.0 173.4
Interest accrued 198.2 157.0
Exchange gas payable 100.0 91.8
Regulatory liabilities 192.0 150.5
Asset Retirement Obligation 66.3 84.6
Accrued compensation and employee benefits 218.0 268.2
Other accruals 165.7 170.2
Total Current Liabilities [2] 3,533.4 4,113.4
Other Liabilities    
Deferred income taxes 2,405.4 2,281.6
Accrued liability for postretirement and postemployment benefits 174.4 207.5
Regulatory liabilities 1,487.0 1,431.2
Asset retirement obligations 751.4 698.6
Other noncurrent liabilities 337.4 313.0
Total Other Liabilities [2] 5,155.6 4,931.9
Total Capitalization and Liabilities $ 34,402.9 $ 31,788.1
Common Stock, Shares Authorized 750,000,000 750,000,000
Common Stock, No Par Value $ 0.01 $ 0.01
Prepaid Expense, Current $ 157.4 $ 138.5
Joint Ventures    
Property, Plant and Equipment    
Net Property, Plant and Equipment 1,284.4  
Current Assets    
Total Current Assets 59.6 65.0
Current Liabilities    
Total Current Liabilities 54.4 53.7
Other Liabilities    
Total Other Liabilities $ 55.0 $ 58.3
[1] Includes $1,284.4 million and $1,323.8 million at September 30, 2025 and December 31, 2024, respectively, of net property, plant and equipment assets and $59.6 million and $65.0 million at September 30, 2025 and December 31, 2024, respectively, of current assets of consolidated VIEs that may be used only to settle obligations of the consolidated VIEs. Refer to Note 4, "Noncontrolling Interests," for additional information.
[2] Includes $54.4 million and $53.7 million at September 30, 2025 and December 31, 2024, respectively, of current liabilities and $55.0 million and $58.3 million at September 30, 2025 and December 31, 2024, respectively, of other liabilities, and finance leases of $40.2 million and $40.4 million at September 30, 2025 and December 31, 2024 respectively, of consolidated VIEs that creditors do not have recourse to our general credit. Refer to Note 4, "Noncontrolling Interests," for additional information.