NOBERT MATARUTSE TECHNICAL DIRECTOR ESKOM UGANDA LIMITED UGANDA Who we are?
• Eskom Uganda Limited is a whole owned subsidiary of Eskom Enterprises South Africa. • Took over the operations of the complex on 1st April, 2003. • Concessioned to operate and maintain Nalubaale and Kiira Hydro Power stations for 20 years under four contracts Electricity Generation line
BUSINESS ENABLERS FOUR AGREEMENTS
Concession & Assignment Water Mgt/ BUSINESSAgreement VALUE CHAIN Generation Capacity (UEGCL) Power Dispatch Support Agreement UETCL (DWD) (PPA, Licence)
Sales/Tariffs Water Abstraction Operations & Maintenance Licence Permit (ERA)
Hydropower Electricity Generation Business Generation Licence (ERA) Additional Agreements
• Support Agreement • Heads of Agreement until 30th June 2011 Aerial Overview
Lake Victoria
Source of the Nile
Railway Bridge
Kampala -Jinja Highway Sluice gate Nalubaale Power Station Canal
Spillway
on Kiira Power Stati Eskom Uganda Limited (EUL) Nalubaale Power House Kiira Power Station Introduction and background
• Prior to year 2001 Uganda had a vertically integrated power utility, Uganda Electricity Board, responsible for power generation, transmission and distribution of electricity. No regulatory framework was in place • Uganda Electricity Generation Company Limited was born out of the de-regulation of the electricity industry in Uganda Introduction Cont’d
• De-regulation was motivated by among other reasons, the need to improve service delivery, increasing electrification rate and as a way of increasing accountability and the desire to provide a fertile environment for investment in this critical industry. Introduction Cont’d
• Prior to de-regulation power industry was characterised by frequent power blackouts, trips and dwindling plant capacity and high operating costs. Nalubaale and Kiira Power Stations • Installed Capacity Nalubaale 10 X 18MW= 180MW-Vertical Shaft Kaplan Units • Ist unit commissioned in 1954. All units uprated and refurbished in between 1992- 1998-Uprated from 15MW to 18MW each • Installed Capacity Kiira 5 X 40MW= 200MW- Vertical Shaft Propeller Units • Total Installed Capacity For Complex= 380MW • Peak Generation currently 217MW due to hydrological Constraints Nalubaale and Kiira Power Stations Nalubaale PS Kiira PS Rated 18.9 20.8 Head (m) Specific 19.8 18.02 water consumpti on factor (m3/kWh) Previous Planning Philosophy
• Uganda Electricity Generation Company Limited (UEGCL) being a parastatal was not bound by any Power Purchase Agreement. • UEGCL had a time based planning philosophy • UEGCL declared installed capacity and were paid based on same. • UEGCL’s planning was based on OEM’s recommendations provided soon after rehabilitation Previous Planning Philosophy
• UEGCL were in charge of the complex for slightly more than 2 years during which time they used a job card system for managing routines and defects Eskom’s Planning Methodology
• Time and condition based • Microsoft access based deviation management system was established • Deviation management system which is still in place is like a manual (s.c.a.d.a) system • Plant history developed by the creation of the centralised documentation center. Eskom’s Planning Methodology
• Plant history so developed was key as it enabled proper trending of critical plant parameters and performance of plant. • Plant history was also utilised to kick start plant intervention programs with a view to stimulate continuous improvement. • 10 year Technical Plan and Life of Plant Plans developed. • System Engineering and modification programs established Maintenance Philosophy
• 36 monthly cycle-maintenance outage- 30days • 18 monthly cycle-detailed inspection- 15days feeds into 36 Monthly cycle maintenance • 6 monthly cycle-1day routine • Using condition monitoring schemes installed, maintenance outages are effected before breakdowns Maintenance Planning and Implementation • Outage management procedure in place • Pre and post outage planning meetings • KKS plant break down system used for physical assets identification. • Work packages-for standardisation-doing things right first time. • Annual plan submitted to system operator 120 days before the following year. • Annual plan takes into account outage scheduling Power Generation Performance Indicators
• The following were and are still being measured on a monthly basis in order to guide plant performance and ensure service delivery; Power Generation Performance Indicators • Plant Availability • Plant Reliability • Unplanned Automatic Grid Separations • Planned Outage Rate • Forced Outage Rate (including Mode change failures) • Plant Load Factor • Plant Efficiency Plant Availability Benchmarks
Availa Company Country bility Mighty River New Power Zealand 92.4% New Meridian Energy Zealand 94.0% British Columbia Hydro Canada 96.4% Eskom Uganda Ltd Uganda 96.0%
Intervention measures employed to achieve performance • replacement of dc systems • modification of protection schemes • modification of governing systems • installation of vibration monitoring equipment • installation of partial discharge scheme • transformer replacement • circuit breaker replacement • surge arrestors replacement Intervention measures employed to achieve performance • System engineering including in-depth incident investigations. • Standardisation of maintenance tasks and procedures • Enforcement of statutory maintenance • Training and development including exposure programs KGRTC & Eskom SA • Performance management. EUL’S Contribution to the Economy • Capital investment in projects to date amounting to USD 10Million • Technological Transfer • Revenue to the Government, ranked among the first 100 on the National Tax Payers list. • Employment – Current Total Manpower = 115, with only 3 expatriates. • Training opportunity – graduate trainees & artisan/ operator trainees • Reduction in Government expenditure. • CSR programs – HIV/AIDS, tree planting Challenges---Nalubaale Power Station • Alkaline Silicate Reaction (ASR) • Age related failures • Unknown condition of underwater structures • Hybrid Technology (Old and new technology in co-existence) • Alignment problems caused by ASR • Water hyacinth • Obsolescence Business Challenge • Change management from a parastatal setting to a private sector setting whilst embedding Eskom practices. Challenges---Kiira Power Station
• Hybrid Technology from different OEMs • Premature failures e.g lifting equipment • Rotor Earth faults caused by under design of cable by a ‘reputable’ contractor • User unfriendly designs which unnecessarily elongate outages • Vibrations on 2 out of 5 units • Water hyacinth Problems caused by Water Hyacinths Universal Problems
• Poor hydrology • System instability Performance Outlook
• Conjunctive operation with downstream power plants. • Commissioning of an integrated computerised maintenance management system that relates to functional areas of the business. • Increased plant optimisation Performance Outlook
• Improvement in manpower utilisation • Increased cost effectiveness • Further improvement in service delivery • Focus on quality assurance • Increased focus on risk management The End
• Thank You
• Website http://www.eskom.co.ug