Exhibit 21
Affiliates and Subsidiaries of Wisconsin Public Service Corporation December 31, 2014
	Wisconsin Public Service Corporation *
		WPS Leasing, Inc. *
		Wisconsin Valley Improvement Company (27.1% ownership) *
		Wisconsin River Power Company (50% ownership) *
		WPS Investments, LLC (approximately 10.98% ownership) *
			American Transmission Company LLC (approximately 34.07% ownership) *
		ATC Management Inc. (32.16% ownership of Class A Shares) *

	All affiliated companies listed are 100% owned except as noted otherwise.
*	Formed under Wisconsin law.