Day-to-Day Efforts for the Stable Supply of Electric
Power
13
Prevention of power outages and support for prompt recovery
In order to provide a stable supply of electricity in the vast and snowy harsh natural environment of Hokkaido, HEPCO has strived to reduce the number of power outages by carrying out appropriate equipment maintenance 24 hours a day, 365 days a year. In addition, HEPCO is working to shorten the duration of power outages to restore power as soon as possible in the event of an outage.
Securing a stable supply of electric power
With the shutdown of reactors at the Tomari Nuclear Power Station, HEPCO’s thermal power stations, which include some aging facilities, have continued high load oparation, increasing the risk of unscheduled stoppages at power stations.
In such circumstances, HEPCO has systematically undertaken inspections and repairs of facilities at its thermal power stations and hydroelectric power stations in order to deliver a stable supply of electric power. Regular patrols of facilities and monitoring of operations have also been strengthened in a preemptive effort to prevent any trouble.
Visual check of boiler combustion Inspecting the shaft of a water turbine
■Duration and frequency of power outages per household per year
250
200
150
100
50
0
2.0
1.6
1.2
0.8
0.4
0.0 248
42
9 9 9 10
36
8 6
48
1.78
0.41
0.18 0.13 0.110.19 0.16 0.13 0.150.17
1981 1991 2001 2011 2012 2013 2014 2015 2016 2017（FY）
Removing a covering of snow from a distribution line
Maintenance work on a transmission line
* The duration of power outages significantly increased in FY 2013 and FY 2017 as compared to the previous fiscal year due to extended outages caused by a blizzard in November 2012 and a typhoon in August 2016 respectively.
Duration Frequency
Frequency
(number of times/household) Duration
