- Center for Energy and Environment
 - Works to promote the responsible and efficient use of natural and economic resources. - Navitas Energy
- Sells wind energy to electric utilities, co-ops and municipals.
- NRG Energy
- Engaged in the acquisition, development, operation, and maintenance of power generation facilities.
- Electricity > Utilities
- Xcel Energy
- Utility company serving electricity and natural gas customers.
- Petroleum
- DurEquip
- Specialises in refurbished gas pumps and fuel dispensing equipment.
- Petroleum > Natural Gas
- Standby Systems, Inc.
- Propane peak shaving and standby systems and safety, control and communication solutions. Provides engineering, equipment, construction and support.
- Petroleum > Natural Gas > Utilities
- Minnegasco
- Natural gas distribution company.
- Xcel Energy
- Utility company serving electricity and natural gas customers.
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