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Business Segment Information (Tables)

9 Months Ended

Sep. 30, 2025

Segment Reporting [Abstract]

Schedule Of Operating Income Derived From Revenues And Expenses By Segment

Three Months Ended September 30, 2025
(in millions)			Columbia Operations						NIPSCO Operations						Total of Reportable Segments
Operating Revenues
External Revenue			$	484.9					$	787.0					$	1,271.9
Intersegment Revenue			3.3						0.3						3.6
Total Operating Revenue			$	488.2					$	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			52.0						19.1						71.1
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.

Three Months Ended September 30, 2024
(in millions)			Columbia Operations						NIPSCO Operations						Total of Reportable Segments
Operating Revenues
External Revenue			$	423.4					$	652.6					$	1,076.0
Intersegment Revenue			3.3						0.3						3.6
Total Operating Revenue			426.7						652.9						1,079.6
Cost of energy			34.2						131.7						165.9
O&M			202.9						177.7						380.6
Depreciation			103.0						156.8						259.8
Total other taxes			45.4						15.4						60.8
Operating Income			$	41.2					$	171.3					$	212.5

Nine Months Ended September 30, 2025
(in millions)			Columbia Operations						NIPSCO Operations						Total of Reportable Segments
Operating Revenues
External Revenue			$	2,326.7					$	2,409.0					$	4,735.7
Intersegment Revenue			10.0						0.8						10.8
Total Operating Revenue			$	2,336.7					$	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			171.4						55.7						227.1
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.

Nine Months Ended September 30, 2024
(in millions)			Columbia Operations						NIPSCO Operations						Total of Reportable Segments
Operating Revenues
External Revenue			$	1,864.5					$	2,002.2					$	3,866.7
Intersegment Revenue			9.6						0.8						10.4
Total Operating Revenue			1,874.1						2,003.0						3,877.1
Cost of energy			319.3						436.3						755.6
O&M			604.9						556.5						1,161.4
Depreciation			300.6						432.5						733.1
Total other taxes			149.5						47.8						197.3
Other segment items(1)			—						(0.1)						(0.1)
Operating Income			$	499.8					$	530.0					$	1,029.8

(1)Other segment items consists of (Gain) 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, 2025						December 31, 2024
Assets
Columbia Operations			$	15,267.9					$	14,769.5
NIPSCO Operations			17,834.8						15,823.5
Corporate and Other			1,300.2						1,195.1
Consolidated Assets			$	34,402.9					$	31,788.1

To reconcile the segment tables above to consolidated NiSource:

Three Months Ended September 30, 2025
(in millions)			Total Reportable Segments						Corporate and Other						Eliminations						Consolidated NiSource
Total Operating Revenue			$	1,275.5					$	151.8					$	(154.2)					$	1,273.1
Operating Income			284.7						12.8						—						297.5

Three Months Ended September 30, 2024
(in millions)			Total Reportable Segments						Corporate and Other						Eliminations						Consolidated NiSource
Total Operating Revenue			$	1,079.6					$	145.9					$	(149.2)					$	1,076.3
Operating Income			212.5						5.8						—						218.3

Nine Months Ended September 30, 2025
(in millions)			Total Reportable Segments						Corporate and Other						Eliminations						Consolidated NiSource
Total Operating Revenue			$	4,746.5					$	441.8					$	(449.0)					$	4,739.3
Operating Income			1,298.6						21.2						—						1,319.8

X

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 25
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-25

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-30

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- References

No definition available.

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