TEG Exhibit 21



Exhibit 21
Affiliates and Subsidiaries of Integrys Energy Group, Inc. December 31, 2013

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 11.36% ownership) ⁽²⁾
			American Transmission Company LLC (approximately 34.07% ownership) ⁽²⁾
		ATC Management Inc. (32.16% ownership of Class A Shares) ⁽²⁾

	WPS Investments, LLC (approximately 86.22% 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⁾

	Upper Peninsula Power Company ⁽⁶⁾
		WPS Investments, LLC (approximately 2.42% ownership) ⁽²⁾
			American Transmission Company LLC (approximately 34.07% ownership) ⁽²⁾
		ATC Management Inc. (1.91% ownership of Class A Shares) ⁽²⁾

	Integrys Energy Services, Inc. ⁽²⁾
		Integrys Energy Services – Natural Gas, LLC ⁽³⁾
			Compass Energy Services, Inc. ⁽⁹⁾
				Compass Energy Gas Services, LLC ⁽⁹⁾
		Integrys Energy Services – Electric, LLC ⁽³⁾
		Integrys Energy Services of Canada Corp. (formed under Canadian law)
		Integrys Energy Services of New York, Inc. ⁽⁷⁾
		PERC Holdings, LLC ⁽³⁾
		Solar Hold 2008-1, LLC (1% ownership) ⁽³⁾



Exhibit 21
Affiliates and Subsidiaries of Integrys Energy Group, Inc. December 31, 2013

	Integrys Energy Services, Inc. continued
		WPS Power Development, LLC ⁽²⁾
			PDI Stoneman, Inc. ⁽²⁾
			Winnebago Energy Center LLC ⁽³⁾
			Wisconsin Woodgas LLC ⁽²⁾
			Wisconsin Energy Operations LLC (49% ownership) ⁽²⁾
			ECO Coal Pelletization #12 LLC ⁽³⁾
			Sunbury Holdings, LLC ⁽³⁾
			WPS Empire State, Inc. ⁽⁷⁾
			Combined Locks Energy Center, LLC ⁽²⁾
			Solar Hold 2008-1, LLC (99% ownership) ⁽³⁾
				Soltage-MAZ 700 Tinton Falls, LLC (99% ownership) ⁽³⁾
				Soltage-ADC 630 Jamesburg, LLC (99% ownership) ⁽³⁾
				Soltage-PLG 500 Millford, LLC (99% ownership) ⁽³⁾
			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⁾
				Hemlock Solar, LLC ⁽³⁾
				Integrys MA Solar, LLC ⁽³⁾
				Cabot Beverly, LLC ⁽³⁾
				Integrys Residential Solar, LLC ⁽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.