Assessment of Maintenance Performance Level of Selected Hydropower Plants in Tanzania

Despite significant progress in increasing electricity access to over 78%, electricity reliability in Tanzania remains a concern, with frequent power outages reported. Maintenance issues in hydropower plants have been identified as a critical factor contributing to this problem. However, the specific maintenance performance levels have not been fully assessed. This study conducts a comprehensive evaluation of the maintenance performance of four key hydropower plants: Kidatu (204 MW), Kihansi (180 MW), Mtera (80 MW), and New Pangani Falls (68 MW). Data collected from staff surveys and maintenance records between 2018 and 2022 were used in the study. Although staff demonstrated a reasonable awareness of the hydropower plants Key Performance Indicators (KPIs), with a minimum mean score of 3.66, the findings reveal underperformance across all plants, with a heavy reliance on reactive rather than proactive maintenance. Low plant availability (89%), insufficient planned work (42%), and excessive unplanned work (55%) were recorded. High Mean time to Repair and frequent failures, particularly at New Pangani Falls, were also observed. This research underscores the importance of strategic maintenance improvements to enhance the reliability and efficiency of Tanzania's hydropower sector.