| Category | Group | Group |
| A (Project Cost <= Rs 400 cr) | B (Project Cost > Rs 400 cr) | |
| Solar/Wind | Nil | 1. Tata Projects Ltd. |
| 2. WAPCOS Ltd. | ||
| 3. TUV SUD South Asia Pvt Ltd. | ||
| 4. TUV Rheinland (India) Pvt Ltd. | ||
| 5. Mercados Energy Markets India Pvt Ltd. | ||
| Hydro | Energy Infratech Pvt Ltd. | WAPCOS Ltd. |
| Others (Thermal/Biomass/WTE/T&D etc.) | Nil | 1. L&T - Sargent & Lundy Ltd. |
| 2. TUV SUD South Asia Pvt Ltd. | ||
| 3. Steag Energy Services India Pvt Ltd. |
