v3.26.1
Business Segment Information (Tables)
 6 Months Ended
Jun. 30, 2026
Segment Reporting [Abstract]  
Schedule Of Operating Income Derived From Revenues And Expenses By Segment
Three Months Ended June 30, 2026
(in millions)
Columbia Operations
NIPSCO Operations
Total of Reportable Segments
Operating Revenues
External Revenue
$597.0 $743.9 $1,340.9 
Intersegment Revenue
3.5 0.3 3.8 
Total Operating Revenue$600.5 $744.2 $1,344.7 
Cost of energy
80.8 111.8 192.6 
O&M
225.2 270.4 495.6 
Depreciation
131.4 222.2 353.6 
Total other taxes
59.819.479.2 
Operating Income$103.3 $120.4 $223.7 
Three Months Ended June 30, 2025
(in millions)Columbia OperationsNIPSCO OperationsTotal of Reportable Segments
Operating Revenues
External revenue$601.2 $680.6 $1,281.8 
Intersegment revenue3.5 0.2 3.7 
Total Operating Revenue604.7 680.8 1,285.5 
Cost of energy
110.4 151.4 261.8 
O&M
207.7 211.0 418.7 
Depreciation
111.7 165.9 277.6 
Total other taxes
52.418.170.5
Other segment items(1)
0.3 0.4 0.7 
Operating Income$122.2 $134.0 $256.2 
(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.

Six Months Ended June 30, 2026
(in millions)
Columbia Operations
NIPSCO Operations
Total of Reportable Segments
Operating Revenues
External revenue$1,920.2 $1,782.4 $3,702.6 
Intersegment revenue6.9 0.6 7.5 
Total Operating Revenue$1,927.1 $1,783.0 $3,710.1 
Cost of energy
464.7 397.1 861.8 
O&M
503.6 491.8 995.4 
Depreciation
252.3 384.9 637.2 
Total other taxes
130.940.3171.2 
Operating Income$575.6 $468.9 $1,044.5 
Six Months Ended June 30, 2025
(in millions)Columbia OperationsNIPSCO OperationsTotal of Reportable Segments
Operating Revenues
External revenue$1,841.8 $1,622.0 $3,463.8 
Intersegment revenue6.7 0.5 7.2 
Total Operating Revenue1,848.5 1,622.5 3,471.0 
Cost of energy
490.2 419.1 909.3 
O&M
450.7 413.0 863.7 
Depreciation
219.9 307.2 527.1 
Total other taxes
119.436.6156.0
Other segment items(1)
0.3 0.7 1.0 
Operating Income$568.0 $445.9 $1,013.9 
(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)June 30,
2026		December 31,
2025
Assets
Columbia Operations
$16,258.5 $15,903.7 
NIPSCO Operations
19,066.4 18,126.7 
Corporate and Other
2,218.7 1,828.3 
Consolidated Assets
$37,543.6 $35,858.7 

To reconcile the segment tables above to consolidated NiSource:
Three Months Ended June 30, 2026
(in millions)
Total Reportable Segments
Corporate and Other
Eliminations
Consolidated NiSource
Total Operating Revenue
$1,344.7 $163.4 $(165.7)$1,342.4 
Operating Income
223.7 4.4 — 228.1 

Three Months Ended June 30, 2025
(in millions)Total Reportable SegmentsCorporate and OtherEliminationsConsolidated NiSource
Total Operating Revenue$1,285.5 $144.6 $(147.1)$1,283.0 
Operating Income256.2 6.7 — 262.9