High electrical power interruption is a major concern in Ethiopia. Most of the interruptions are caused by the power distribution system. The paper
identifies the main cause of the interruption, assesses the duration, frequency of power interruption, and indicates how much interruption influences the
utility economically. To achieve the target, the steps to be completed are - secondary data like
... [Show full abstract] the cause of the interruption, duration, and frequency of
interruption, number, and type of customer collected from the Adelle-Haramaya substation. The collected data evaluated based on IEEE guide electric
power distribution reliability, compute the cost of loss in a system and identify how much the utility lost and this task done by E-TAP software.
Distribution reliability indices assessment of Adelle_Haramaya the distribution system is, SAIFI, SAIDI, and ENS. The result of reliability indices against
the benchmark is SAIFI, SAIDI and EENS are 15.5986 f/customer. Year, 379.4565 hr. /Customer. A year and 2,986.195MWh /year. The most annual
outage duration and average interruption rate is Grawa feeder among other feeders which are 827.9941 hours/yr and 33.5360 f/yr respectively. This
interruption shows, Adelle-Haramaya Distribution system is unable to satisfy the customers. The Adelle- Haramaya distribution system is lost
3,578,121.6 ETB or 63,263.7644 $ and it has a great impact on the economy what the utility expects to get. In fact, the assessment is done, what the
utility is expected to lose. Regarding, Customer side's costs such as residential, commercial, and industry the customer survey method is recommended.
Finally, the paper suggests three mitigation techniques in order to tackle the problem, providing reliable and good quality of continuous power to
customers such as Design, security strategy, and Adequacy solutions.
