Subsidiaries - (India)
- TP Bikaner III Neemrana II Transmission Limited
- Industrial Energy Limited
- Japura Khurja Power Transmission Limited
- Maithon Power Limited
- NELCO Limited
- Nelco Network Products Limited (Subsidiary of NELCO Limited)
- Powerlinks Transmission Limited
- TP Ajmer Distribution Limited
- Tata Power Delhi Distribution Limited
- NDPL Infra Limited (Subsidiary of Tata Power Delhi Distribution Limited)
- Tata Power Jamshedpur Distribution Limited
- Tata Power Renewable Energy Limited
- TP Power Plus Limited
- TP Renewable Microgrid Limited
- TP Central Odisha Distribution Limited
- TP Western Odisha Distribution Limited
- TP Southern Odisha Distribution Limited
- TP Northern Odisha Distribution Limited
- Tata Power Trading Co. Limited
Subsidiaries - (Foreign)
- Bhivpuri Investments Limited
- Bhira Investments Pte. Limited
- Khopoli Investments Limited
- Tata Power International Pte. Limited
- Far Eastern Natural Resources LLC (Subsidiary of Tata Power International Pte. Limited )
- Trust Energy Resources Pte. Limited (Subsidiary of Tata Power International Pte. Limited )
- PT Sumber Energi Andalan TBK ( Subsidiary of Trust Energy Resources Pte. Limited )