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NiSource was founded in 1912 as the Northern Indiana Public Service Company, which merged with several other companies to become the Columbia Gas and Electric Corporation. Under the Public Utility Holding Company Act of 1935, Columbia was forced to reorganize its subsidiaries and eventually spun off its electric utilities, becoming the Columbia Gas System. In 2000, NiSource merged with Columbia Energy Group, but in 2015, NiSource was spun off from Columbia Pipeline Group. The next year, Columbia Pipeline Group was acquired by TransCanada Corporation, while the Columbia Gas distribution companies remained with NiSource.