| System | Geo-political zones | ||||||
| NC | NE | NW | SE | SS | SW | Average | |
| PV annual cost (US$) | 97.54 | 91.62 | 91.62 | 105.82 | 112.45 | 103.69 | 100.46 |
| DG annual cost (US$) | 231.24 | 231.24 | 231.24 | 231.24 | 231.24 | 231.24 | 231.24 |
| GKL annual cost (US$) | 136.50 | 136.50 | 136.50 | 136.50 | 136.50 | 136.50 | 136.50 |
| AI of PV (−) | 4.17 | 3.92 | 3.92 | 4.52 | 4.81 | 4.43 | 4.29 |
| AI of DG (−) | 9.88 | 9.88 | 9.88 | 9.88 | 9.88 | 9.88 | 9.88 |
| AI of GKL (−) | 5.83 | 5.83 | 5.83 | 5.83 | 5.83 | 5.83 | 5.83 |