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- All Natural Solar and Wind Power
 - Wilmette - Specialising in wind and solar energy kits. Products include solar panels, wind turbines, inverters, and batteries. - Gas Research Institute
- Chicago - Provides technical information and research results relevant to the natural gas industry.
- Nekolux Renewable Energy
- Chicago - Designs and installs renewable energy systems.
- Electricity > Utilities
- Commonwealth Edison (ComEd)
- Chicago - ComEd is a residential energy services company providing electricity to Northern Illinois.
- Exelon Corporation
- Chicago - Generator and provider of natural gas, coal, hydro, nuclear, solar, and wind-generated electricity. Parent company of PECO and ComEd (Commonwealth Edison).
- Petroleum
- DRW Services, Inc.
- Chicago Heights - Offers gas station construction and equipment. Services include gas tank installation/removal for all service stations, petroleum equipment, and tank/line testing.
- Petro Vend, Inc.
- Hodgkins - Manufactures unattended automated fuel management systems, environmental tank gauging and leak detection systems, and retail POS equipment/systems.
- Petroleum > Natural Gas > Utilities
- Peoples Energy
- Chicago - Diversified energy company operating in gas distribution, power generation, midstream services, oil and gas production, and retail energy services.
- Solar
- Chicago Solar Partnership
- Chicago - Educational and informational learning tools for installing photovoltaic and renewable energy systems in the home, school, or business.
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