- Adica Energy Consulting
 - Oak Brook - Provides strategic analysis software and consultation for utility pricing, asset optimisation, risk management, energy-economic-environmental analysis, and GHG mitigation assessment. - 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.
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