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NiSource Inc.

Filing: SEC 10-Q
Period: Customers at 2026-03-31; 2026 capital-investment estimate
Basis: Editorial filing; Read original SEC 10-Q ↗

Sankey diagram of NiSource Inc.. A complete text table follows the diagram.

NiSource's 3.8M Utility Relationships Anchor a $5.2-$5.6B Buildout

A predominantly residential customer base spans six-state Columbia Gas operations and NIPSCO's gas-and-electric network in Indiana.

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Source & review

Read original SEC 10-Q ↗

SEC accession: 0001111711-26-000045
Filed: Date not recorded
Reviewed: 2026-07-28
Status: Individual filing review complete

How to read these figures

Counts represent utility service relationships, not necessarily unique people, premises or legal customers. A NIPSCO customer receiving both gas and electric service may appear in both operating tables. The capital-investment range is filing guidance and is context rather than a Sankey flow.

Labels and narrative explain the filing. A category marked “arithmetic bridge” or “residual” is calculated from reported totals, rather than a separately reported line.

Columbia Gas represents nearly two-thirds of the reported service relationships.
More than 9 in 10 relationships are residential, making household utility service the network's operating center.
NiSource expects $5.2-$5.6B of 2026 capital investment across its base business and GenCo.

View accessible tables

Financial categories · Customers at 2026-03-31; 2026 capital-investment estimate · Utility service relationships
Category	Stage	Value	Notes
Utility service relationships	1	3,813,239	3.81M reported operating-customer relationships
Columbia Gas operations	2	2,436,889	Gas distribution across six states
NIPSCO Gas	2	879,179	Indiana gas distribution
NIPSCO Electric	2	497,171	Indiana generation and power delivery
Residential	3	3,488,210	91.5% of service relationships
Commercial	3	317,568	8.3% of service relationships
Industrial	3	6,753	6,753 service relationships
Wholesale and other	3	708	Primarily NIPSCO Electric

Financial flows · Utility service relationships
From	To	Value
Utility service relationships	Columbia Gas operations	2,436,889
Utility service relationships	NIPSCO Gas	879,179
Utility service relationships	NIPSCO Electric	497,171
Columbia Gas operations	Residential	2,244,188
Columbia Gas operations	Commercial	190,714
Columbia Gas operations	Industrial	1,981
Columbia Gas operations	Wholesale and other	6
NIPSCO Gas	Residential	809,503
NIPSCO Gas	Commercial	67,011
NIPSCO Gas	Industrial	2,665
NIPSCO Electric	Residential	434,519
NIPSCO Electric	Commercial	59,843
NIPSCO Electric	Industrial	2,107
NIPSCO Electric	Wholesale and other	702