- Gas Research Institute
 - Provides technical information and research results relevant to the natural gas industry. - Nekolux Renewable Energy
- Designs and installs renewable energy systems.
- Electricity > Utilities
- Commonwealth Edison (ComEd)
- ComEd is a residential energy services company providing electricity to Northern Illinois.
- Exelon Corporation
- Generator and provider of natural gas, coal, hydro, nuclear, solar, and wind-generated electricity. Parent company of PECO and ComEd (Commonwealth Edison).
- Petroleum > Natural Gas > Utilities
- Peoples Energy
- Diversified energy company operating in gas distribution, power generation, midstream services, oil and gas production, and retail energy services.
- Solar
- Chicago Solar Partnership
- Educational and informational learning tools for installing photovoltaic and renewable energy systems in the home, school, or business.
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