Trends of technological disturbances
| Indicators | 2011 | 2012 | 2013 | 2014 | 2015 | Variance in 2015/2014,% |
|---|---|---|---|---|---|---|
| Per unit accident rate | 6.79 | 11.43 | 13.05 | 9.82 | 6.77 | –31.0 |
| Electricity undersupply, thousand kWh | 2,344.8 | 2,456.9 | 6,337.6 | 5,249.18 | 3,240.38 | –38.3 |
| Electricity interruption, hours | 11,977.3 | 104,666.9 | 76,534.4 | 27,894.03 | 26,229.13 | –6.0 |
| Financial damage, RUB thousand | 48,313.2 | 46,679.0 | 70,367.2 | 67,514.24 | 59,071.89 | –12.5 |
Based on the analysis of technological disturbances in 6kV or higher voltage grids of PJSC IDGC of the North-West in the reporting period, overall improvement of reliability was observed in 2015 as compared to 2014.
Most technological disturbances in 2015 were caused by exposure to recurring disasters (47%), trees falling on HVLs (23%) and worn-out (broken) insulation (14%).