2014 TEG 10-K Exhibit 21



Exhibit 21
Affiliates and Subsidiaries of Integrys Energy Group, Inc. December 31, 2014

INTEGRYS ENERGY GROUP, INC. ^{(1) (2)}

	Wisconsin Public Service Corporation ⁽²⁾
		WPS Leasing, Inc. ⁽²⁾
		Wisconsin Valley Improvement Company (27.1% ownership) ⁽²⁾
		Wisconsin River Power Company (50% ownership) ⁽²⁾
		WPS Investments, LLC (approximately 10.98% ownership) ⁽²⁾
			American Transmission Company LLC (approximately 34.07% ownership) ⁽²⁾
		ATC Management Inc. (32.16% ownership of Class A Shares) ⁽²⁾

	ATC Management Inc. (1.91% ownership of Class A Shares) ⁽²⁾

	WPS Investments, LLC (approximately 89.02% ownership) ⁽²⁾
		American Transmission Company LLC (approximately 34.07% ownership) ⁽²⁾

	Michigan Gas Utilities Corporation ⁽³⁾

	Minnesota Energy Resources Corporation ⁽³⁾

	Integrys Business Support, LLC ⁽³⁾

	Peoples Energy, LLC ⁽⁴⁾
		The Peoples Gas Light and Coke Company ⁽⁴⁾
			Peoples Gas Neighborhood Development Corporation ⁽⁴⁾
		North Shore Gas Company ⁽⁴⁾
		Peoples Energy Ventures, LLC ⁽³⁾
			Peoples Energy Neighborhood Development, LLC ⁽³⁾
			Peoples Technology, LLC ⁽³⁾
		Integrys Transportation Fuels, LLC ⁽³⁾
			Pinnacle CNG Company, LLC ⁽⁵⁾
				Pinnacle CNG Systems, LLC⁽⁵⁾
			Trillium USA Company, LLC ⁽³⁾
				Trillium USA, LLC⁽³⁾
			AMP Trillium, LLC (30% ownership) ⁽³⁾
			EVO Trillium, LLC (15% ownership) ⁽³⁾



Exhibit 21
Affiliates and Subsidiaries of Integrys Energy Group, Inc. December 31, 2014

	WPS Power Development, LLC ⁽²⁾
		PERC Holdings, LLC ⁽³⁾
		PDI Stoneman, Inc. ⁽²⁾
		Winnebago Energy Center LLC ⁽³⁾
		ECO Coal Pelletization #12 LLC ⁽³⁾
		Sunbury Holdings, LLC ⁽³⁾
		WPS Empire State, Inc. ⁽⁷⁾
		Combined Locks Energy Center, LLC ⁽²⁾
		Integrys Solar, LLC ⁽³⁾
			INDU Solar Holdings, LLC (50% ownership) ⁽³⁾
			Sun Devil Solar LLC ⁽³⁾
			Gilbert Solar Facility I, LLC ⁽³⁾
			Solar Star California II, LLC ⁽³⁾
			Integrys NJ Solar, LLC ⁽³⁾
			Solar Star New Jersey VI, LLC ⁽³⁾
			Crimson Solar, LLC ⁽³⁾
			Camden Solar Center, LLC ⁽⁸⁾
			Integrys MA Solar, LLC ⁽³⁾
			Integrys Residential Solar, LLC ⁽³⁾
			Sunny Templeton, LLC ⁽³⁾
			Solar Hold 2008-1, LLC ⁽³⁾
				Soltage-MAZ 700 Tinton Falls, LLC (99% ownership) ⁽³⁾
				Soltage-ADC 630 Jamesburg, LLC (99% ownership) ⁽³⁾
				Soltage-PLG 500 Milford, LLC (99% ownership) ⁽³⁾
		LGS Renewables I, LC ⁽⁵⁾

	WPS Visions, Inc. ⁽²⁾

	Penvest, Inc. ⁽⁶⁾


⁽¹⁾	Integrys Energy Group, Inc. is the parent holding company. All affiliated companies listed are 100% owned except as noted otherwise.
⁽²⁾	Formed under Wisconsin law.
⁽³⁾	Formed under Delaware law.
⁽⁴⁾	Formed under Illinois law.
⁽⁵⁾	Formed under Texas law.
⁽⁶⁾	Formed under Michigan law.
⁽⁷⁾	Formed under New York law.
⁽⁸⁾	Formed under New Jersey law.
⁽⁹⁾	Formed under Virginia law.