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| Average annual total cost | Average annual variable cost | Served population | Thermal plants production | Installed capacity |
| Spearman’s rho | Average annual total cost | Correlation Coefficient | 1.000 | 0.938** | −0.957** | −0.956** | −0.957** |
| Sig. (2-tailed) | . | 0.000 | 0.000 | 0.000 | 0.000 | ||
| N | 32 | 32 | 32 | 32 | 32 | ||
| Average annual variable cost | Correlation Coefficient | 0.938** | 1.000 | −0.890** | −0.890** | −0.889** | |
| Sig. (2-tailed) | 0.000 | . | 0.000 | 0.000 | 0.000 | ||
| N | 32 | 32 | 32 | 32 | 32 | ||
| Served population | Correlation Coefficient | −0.957** | −0.890** | 1.000 | 0.982** | 0.980** | |
| Sig. (2-tailed) | 0.000 | 0.000 | . | 0.000 | 0.000 | ||
| N | 32 | 32 | 32 | 32 | 32 | ||
| Thermal plants production | Correlation Coefficient | −0.956** | −0.890** | 0.982** | 1.000 | 0.997** | |
| Sig. (2-tailed) | 0.000 | 0.000 | 0.000 | . | 0.000 | ||
| N | 32 | 32 | 32 | 32 | 32 | ||
| Installed capacity | Correlation Coefficient | −0.957** | −0.889** | 0.980** | 0.997** | 1.000 | |
| Sig. (2-tailed) | 0.000 | 0.000 | 0.000 | 0.000 | . | ||
| N | 32 | 32 | 32 | 32 | 32 |