| "EFEKT-AUTOMATYKA Sp. z o.o. | Ruda Slaska | Poland |
| (none) | Taichung | Taiwan |
| (none) | Boucherville | Canada |
| (none) | Holte | Denmark |
| (none) | Wellington | New Zealand |
| (none) | Hamilton | New Zealand |
| (none) | Daejeon | Korea, Republic of |
| A123 Systems | Watertown | United States |
| ABB | Breinigsville | United States |
| ABB | Stonehouse | United Kingdom |
| ABB | Lake Mary | United States |
| ABB AG | Mannheim | Germany |
| ABB Inc. | Allentown | United States |
| ABB Network Management | Sugarland | United States |
| ActewAGL | Canberra | Australia |
| Administrador del Mercado Mayorista | GUATEMALA | Guatemala |
| Adroit Technologies | Johannesburg | South Africa |
| Advanced Control Systems Inc. | Norcross | United States |
| advanced energy industries, inc. | Fort Collins | United States |
| Advanced Planning Corporation | Yokohama | Japan |
| Alabama Power Co. | Birmingham | United States |
| AltaLink Management LP | Calgary | Canada |
| Altus S.A. | Sao Leopoldo | Brazil |
| American Superconductor | Middleton | United States |
| American Transmission Company | Cottage Grove | United States |