The company has six joint venture companies, these have been established primarily to set up large-scale Solar Parks and related infrastructure, and Solar Parks of a combined capacity of 11820 MW are being developed through them.
| # | Name | Park Capacity (MW) | Project Capacity Commissioned (MW) |
| 1 | Andhra Pradesh Solar Power Corporation Private Limited (A 50-50 Joint Venture of SECI and Andhra Pradesh Govt.) |
4000 | 3300 |
| 2 | Karnataka Solar Power Development Corporation Limited(A 50-50 Joint Venture of SECI and Karnataka Govt.) |
2050 | 2050 |
| 3 | Lucknow Solar Power Development Corporation Limited(A 50-50 Joint Venture of SECI and Uttar Pradesh Govt.) |
475 | 365 |
| 4 | Renewable Power Corporation of Kerala Limited (A 50-50 Joint Venture of SECI and Kerala Govt.) | 205 | 100 |
| 5 | Rewa Ultra Mega Solar Limited (A 50-50 Joint Venture of SECI and Madhya Pradesh Govt.) |
3700 | 2363 |
| 6 | Himachal Renewables Limited (A 50-50 Joint Venture of SECI and Himachal Pradesh Govt.) |
- | - |
| Total | 10430 | 8178 |