v3.26.3
Business Segment Information (Tables)
 9 Months Ended
Sep. 30, 2026
Segment Reporting [Abstract]  
Schedule Of Operating Income Derived From Revenues And Expenses By Segment
Three Months Ended September 30, 2026
(in millions)
Columbia Operations
NIPSCO Operations
Total of Reportable Segments
Operating Revenues
External Revenue
$502.2 $835.2 $1,337.4 
Intersegment Revenue
3.4 0.3 3.7 
Total Operating Revenue$505.6 $835.5 $1,341.1 
Cost of energy
46.5 157.5 204.0 
O&M
204.3 231.3 435.6 
Depreciation
126.5 202.7 329.2 
Total other taxes
8.420.528.9 
Other segment items(1)
0.7 0.4 1.1 
Operating Income$119.2 $223.1 $342.3 
(1)Other segment items consists of Loss on Sale or Impairment of Assets and other segment income or expenses deemed insignificant which are used to reach our measurement of segment profit or loss, Operating Income.
Three Months Ended September 30, 2025
(in millions)Columbia OperationsNIPSCO OperationsTotal of Reportable Segments
Operating Revenues
External revenue$484.9 $787.0 $1,271.9 
Intersegment revenue3.3 0.3 3.6 
Total Operating Revenue488.2 787.3 1,275.5 
Cost of energy
58.5 135.2 193.7 
O&M
212.8 215.1 427.9 
Depreciation
112.7 185.3 298.0 
Total other taxes
52.019.171.1
Other segment items(1)
0.1 — 0.1 
Operating Income$52.1 $232.6 $284.7 
(1)Other segment items consists of Loss on Sale or Impairment of Assets and other segment income or expenses deemed insignificant which are used to reach our measurement of segment profit or loss, Operating Income.

Nine Months Ended September 30, 2026
(in millions)
Columbia Operations
NIPSCO Operations
Total of Reportable Segments
Operating Revenues
External revenue$2,422.4 $2,617.6 $5,040.0 
Intersegment revenue10.3 0.9 11.2 
Total Operating Revenue$2,432.7 $2,618.5 $5,051.2 
Cost of energy
511.2 554.6 1,065.8 
O&M
707.9 723.1 1,431.0 
Depreciation
378.8 587.6 966.4 
Total other taxes
139.360.8200.1 
Other segment items(1)
0.70.41.1 
Operating Income$694.8 $692.0 $1,386.8 
(1)Other segment items consists of Loss on Sale or Impairment of Assets and other segment income or expenses deemed insignificant which are used to reach our measurement of segment profit or loss, Operating Income.
Nine Months Ended September 30, 2025
(in millions)Columbia OperationsNIPSCO OperationsTotal of Reportable Segments
Operating Revenues
External revenue$2,326.7 $2,409.0 $4,735.7 
Intersegment revenue10.0 0.8 10.8 
Total Operating Revenue2,336.7 2,409.8 4,746.5 
Cost of energy
548.7 554.3 1,103.0 
O&M
663.5 628.1 1,291.6 
Depreciation
332.6 492.5 825.1 
Total other taxes
171.455.7227.1
Other segment items(1)
0.4 0.7 1.1 
Operating Income$620.1 $678.5 $1,298.6 
(1)Other segment items consists of Loss on Sale or Impairment of Assets and other segment income or expenses deemed insignificant which are used to reach our measurement of segment profit or loss, Operating Income.
The following table provides information about the assets of our reportable segments included in the Condensed Consolidated Balance Sheets (unaudited):
(in millions)September 30,
2026		December 31,
2025
Assets
Columbia Operations
$16,638.3 $15,903.7 
NIPSCO Operations
19,748.8 18,126.7 
Corporate and Other
2,479.7 1,828.3 
Consolidated Assets
$38,866.8 $35,858.7 

To reconcile the segment tables above to consolidated NiSource:
Three Months Ended September 30, 2026
(in millions)
Total Reportable Segments
Corporate and Other
Eliminations
Consolidated NiSource
Total Operating Revenue
$1,341.1 $165.1 $(156.8)$1,349.4 
Operating Income
342.3 (2.0)— 340.3 

Three Months Ended September 30, 2025
(in millions)Total Reportable SegmentsCorporate and OtherEliminationsConsolidated NiSource
Total Operating Revenue$1,275.5 $151.8 $(154.2)$1,273.1 
Operating Income284.7 12.8 — 297.5