Exhibit 21 | |||||
Affiliates and Subsidiaries of Integrys Energy Group, Inc. December 31, 2010 | |||||
| INTEGRYS ENERGY GROUP, INC.+ * | |||||
| Wisconsin Public Service Corporation+ | |||||
| WPS Leasing, Inc.+ | |||||
| Wisconsin Valley Improvement Company (27.1% ownership) + | |||||
| Wisconsin River Power Company (50% ownership)+ | |||||
| WPS Investments, LLC (approximately 12.54% ownership)+ | |||||
| American Transmission Company LLC (approximately 34.07% ownership)+ | |||||
| ATC Management Inc. (32.11% ownership of Class A Shares)+ | |||||
| WPS Investments, LLC (approximately 84.79% ownership)+ | |||||
| American Transmission Company LLC (approximately 34.07% ownership)+ | |||||
| Michigan Gas Utilities Corporation++ | |||||
| Minnesota Energy Resources Corporation++ | |||||
| Integrys Business Support, LLC++ | |||||
| WPS Visions, Inc.+ | |||||
| Integrys Energy Services, Inc.+ | |||||
| Integrys Energy Services – Natural Gas, LLC++ | |||||
| Integrys Energy Services – Electric, LLC++ | |||||
| Quest Energy, LLC+++ | |||||
| Integrys Energy Services of Canada Corp. (formed under Canadian law) | |||||
| Integrys Energy Services of New York, Inc.++++++ | |||||
PERC Holdings, LLC++ Solar Hold 2008-1, LLC++ (1% ownership) | |||||
| WPS Power Development, LLC+ | |||||
| PDI Stoneman, Inc.+ | |||||
| Winnebago Energy Center, LLC++ | |||||
| Wisconsin Woodgas LLC+ | |||||
| Wisconsin Energy Operations LLC (49% ownership)+ | |||||
| ECO Coal Pelletization #12 LLC++ | |||||
| Sunbury Holdings, LLC++ | |||||
| WPS Westwood Generation, LLC++ | |||||
| WPS Empire State, Inc.++++++ | |||||
| WPS Beaver Falls Generation, LLC++ | |||||
| WPS Syracuse Generation, LLC++ | |||||
| Combined Locks Energy Center, LLC+ | |||||
| Peoples Natural Gas Liquids, LLC++ | |||||
| Solar Hold 2008-1, LLC++ (99% ownership) | |||||
| Soltage-MAZ 700 Tinton Falls, LLC++ (99% ownership) | |||||
| Soltage-ADC 630 Jamesburg, LLC++ (99% ownership) | |||||
| Soltage-PLG 500 Millford, LLC++ (99% ownership) | |||||
| TEGE Solar, LLC++ | |||||
| INDU Solar Holdings, LLC++ (50% ownership) | |||||
| Solar Man, LLC++ | |||||
| Sun Devil Solar LLC++ | |||||
| Solar Star California II, LLC++ | |||||
Solar Star New Jersey I, LLC++ Solar Star New Jersey II, LLC++ Solar Star New Jersey VI, LLC++ | |||||
Crimson Solar, LLC++ Hemlock Solar, LLC++ | |||||
| Solar Star TM2, LLC++ | |||||
| LGS Renewables, I, LC+++++ | |||||
Affiliates and Subsidiaries of Integrys Energy Group, Inc. December 31, 2010 | |||||
| INTEGRYS ENERGY GROUP, INC.+* | |||||
| Peoples Energy Corporation++++ | |||||
| The Peoples Gas Light and Coke Company++++ | |||||
| Peoples Gas Neighborhood Development Corporation++++ | |||||
| North Shore Gas Company++++ | |||||
| Peoples Energy Resources Company, LLC++ | |||||
| Peoples Energy Ventures, LLC++ | |||||
| Peoples Energy Home Services, LLC++ | |||||
| Peoples Energy Neighborhood Development, LLC++ | |||||
| Peoples Technology, LLC++ | |||||
| Upper Peninsula Power Company+++ | |||||
| WPS Investments, LLC (approximately 2.67 ownership)+ | |||||
| American Transmission Company LLC (approximately 34.07% ownership)+ | |||||
| ATC Management Inc. (1.96% ownership)+ | |||||
| Penvest, Inc.+++ | |||||
| * | Integrys Energy Group, Inc. is the parent holding company. All affiliated companies listed are 100% owned except as noted otherwise. | ||||
| + | Formed under Wisconsin law. | ||||
| ++ | Formed under Delaware law. | ||||
| +++ | Formed under Michigan law. | ||||
| ++++ | Formed under Illinois law. | ||||
| +++++ | Formed under Texas law. | ||||
| ++++++ | Formed under New York law. | ||||