• Who We Are
• Our Companies
  • Regulated Subsidiaries
  • Integrys Energy Services
  • Trillium CNG
  • Integrys Business Support
  • Power Plants & Other Assets
• Doing Business With Integrys
• FERC Compliance

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Our Companies

Integrys Energy Group is an energy holding company based in Chicago, Illinois. Our operating subsidiaries provide natural gas and electricity in regulated and nonregulated markets.

• Regulated Subsidiaries
  Our six regulated natural gas and electric utilities are located in Illinois, Michigan, Minnesota and Wisconsin.
• Integrys Energy Services
  Integrys Energy Services provides natural gas and electricity to residential and small business customers through energy choice programs across the U.S.
• Trillium CNG
  Trillium CNG™ is a leading provider of compressed natural gas (CNG) fueling services as well as a single-source provider of CNG fueling facility design, construction, operation and maintenance.
• Integrys Business Support
  Integrys Business Support, LLC, provides innovative, cost-effective services and solutions for Integrys Energy Group's operating subsidiaries.
• Power Plants & Other Assets
  As an energy company, we have a fleet of generation facilities.