| Org Name | Org Type | City | Website | AET Category |
| 2ktool LLC | AET Supplier | Wyoming, MI | 2ktool.com | Wind |
| A & B Machining | AET Supplier | Fruitport, MI | challengeprecision.com | Wind, Batteries/Energy Storage, CO2 Sequestration, Alternative Fuels for Power Generation |
| a.j. Veneklasen | AET Supplier | Grand Rapids, MI | ajvinc.com | Wind |
| Ability Mfg & Eng Co. | AET Supplier | Fennville, MI | www.ameco.org | Wind |
| Accu-Tech Manufacturing Inc. | AET Supplier | Shelby Twp., MI | www.atmfg.com | Wind |
| ACTech North America, Inc. | AET Supplier | Ann Arbor, MI | www.rapidcastings.com | Wind |
| Action Tool & Machine, Inc. | AET Supplier | Brighton, MI | www.actiontoolmachine.com | Wind |
| Actron Steel, Inc. | AET Supplier | Traverse City, MI | | Wind |
| ADAPT - Advanced Design And Prototype Technologies, Inc. | AET Supplier | Farmington Hills, MI | www.ADAPT-Inc.com | Wind |
| Adco Circuits Inc | AET Supplier | Rochester Hills, MI | www.adcocircuits.com | Energy Efficiency |
| ADCO Products, Inc | AET Supplier | Michigan Center, MI | www.adcocorp.com | Wind |
| Advance Engineering Company | AET Supplier | Redford, MI | www.adveng.net | Wind |
| Advanced Accessory Systems | AET Supplier | Sterling Hieghts, MI | www.advancedaccessorysystems.com | Wind |
| Advanced Biodiesel Partners | AET Supplier | Ann Arbor, MI | www.abpbiodiesel.com | Biomass/Bioenergy |
| Aero Expediting Inc. | AET Supplier | Clinton Twp., MI | www.aeroexp.com | Wind |
| Ag Solutions Inc. | AET Supplier | Gladstone, MI | | Biomass/Bioenergy |
| Agape Plastics, Inc. | AET Supplier | Grand Rapids, MI | www.agapeplastics.com | Wind |
| Aircraft Precision Products, Inc. | AET Supplier | Ithaca, MI | www.aircraftprecision.net | Wind |
| AirSpace PZT | AET Venture | , | | Biomass/Bioenergy, Waste to Energy |
| AL-Craft Industries, Inc. | AET Supplier | Troy, MI | www.al-craft.com | Wind |