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Major Operating Performance Indicators in the Past 10 Years

05/28/24

Major Operating Performance Indicators in the Past 10 Years
Year  2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Line Loss Rate                    
Line Loss Rate
4.09 3.72 3.85 3.82 3.94 3.86 3.97 3.53 3.82 3.20
Power Supply Reliability                    
System Average Interruption
Duration Index
min/household‧year
17.496 16.268 16.274 16.898
(32.572)*3
16.187 16.488 15.931 16.376
(43.516)*4
14.936
(91.285)*5
15.225
System Average Interruption
Frequency Index 
times/household‧year
0.264 0.220 0.208 0.212
(0.553)*3
0.227 0.209 0.230 0.233
(0.864)*4
0.181
(0.467)*5
0.186
Employee Productivity                    
Sales per employee
MWh/person
9,086 8,879 9,110 9,245 9,270 9,147 9,257 9,738 9,808 9,563
Households served per employee
household/person
600 589 589 599 601 594 598 610 614 620
Nuclear Power Plant
Operating Efficiency
                   
Energy Generation
GWh
40,801 35,143 30,461 21,560 26,656 31,147 30,342 26,818 22,917 17,154
Number of Automatic
Emergency Shutdowns 
times/unit
0 0.33 0.17 0.50 0.17 0 0.25 0.25 0.67 0
Thermal Power Plant
Operating Efficiency
                   
LHV gross
43.35 43.58 43.70 43.96 44.81 45.64 46.00 46.10 46.26 46.63
Number of electromechanical
accidents
times/unit
0.29 0.36 0.53 0.18 0.15 0.12 0.11 0.11 0.11 0.02
Environmental Improvement                    
Particulate matter (PM)
Kg/GWh
27 30 28 25 21 14 7 6 5 5
SOx
Kg/GWh
305 315 298 278 181 125 102 97 84 77
NOx
Kg/GWh
452 448 443 412 327 234 203 188 169 160
Note:
  1. International standards called SAIDI and SAIFI are used as the reliability indices by power utilities. The System Average Interruption Duration Index (SAIDI) is more commonly disclosed worldwide, while The System Average Interruption Frequency Index (SAIFI) is not. There are formulas for both indices but different parameter definitions within the formula in different countries.
  2. The data listed in upper column is for the regular operation, the one in lower column is for the major incidents.
  3. In 2017 there was 815 power outage incident, which was mainly due to the interruption of the gas supply from CPC Corporation. The SAIDI of this accident was 32.572 (minutes per household per year), and SAIFI was 0.553 (times per household per year)
  4. In 2021 there were 513 & 517 power outage incidents, which result in SAIDI as 43.516 (minutes per household per year) and SAIFI as 0.864 (times per household per year)
  5. In 2022 there were 313 power outage incidents, which result in SAIDI as 91.285 (minutes per household per year) and SAIFI as 0.467 (times per household per year.)

 

Line Loss Rate

Power Supply Reliability

 

Employee Productivity

 

Nuclear Power Plant Operating Efficiency

Thermal Power Plant Operating Efficiency

 

Environmental Improvement