Enhancing Eskom Distribution Network Planning 15 October 2007

1. Power System Planning Horizons Generation Transmission Service Area Size Sub-transmission Reticulation 2 5 15 20 Project Lead Time [years] Enhancing Eskom DistributionNetwork Planning15 October 2007 Dr Clinton Carter-Brown Eskom Industry Association Resource Centre

2. Eskom Distribution Network Planning Eskom Dx Planning (≤132kV) Generation Service Area Size Transmission (>132kV) Sub-transmission (>33kV & ≤132kV) Reticulation (≤33kV) 15 20 2 5 Project Lead Time [years]

3. Present challenges • Increased load growth • Universal Access Plan (UAP) • Need to improve network reliability • Access to critical data • Staff turnover and skills • Distributed Generation (DG) integration • Demand Side Management (DSM)

4. Overview of Network Planning dependencies Support Eskom Research TESCOD Planning SC • Present loading (stats metering) • As-built HV and MV network data • Future load data (demographic and econometric data) • Electrification spatial backlog • Power System Analysis (PSA) • Geo-based Load Forecasting (GLF) • Project Needs Register (PNR) LIRP Advanced Methods • Standards, guidelines & policies • Training • National Resources • Evaluation of supply side and demand side alternatives Base Systems Dx Line • DSM load modelling • Distributed Generation assessment • Economic evaluation of alternatives • Reliability assessment Base Data

5. Overview of initiatives Base systems Base data Enhanced Network Planning Reliability improvement Management Standards & Guidelines Training & Development

6. Base data • Data porting into central SmallWorld database • Data capture processes • Standard values for power system analysis • Statistical metering (HV & MV load data)

7. Economic analysis of alternatives Base systems • PNR (Project Need Register) • Identify needs in a geographical environment • Build projects within geographical environment • PSA (Power System Analysis) • Export network equipment and related technical attributes to a network analysis application • GLF (Geo-based Load Forecast) • Spatial load forecast with a 25 year planning horizon

8. Improved network reliability Probabilistic reliability assessment Guidelines & Training Asset utilisation reporting CAPEX Reliability link

9. Standards and guidelines (new/updated) • MV shunt capacitors • MV step-voltage regulators • Distribution voltage regulation and apportionment limits • MV underground cable systems • Network asset cost of supply methodology • Methodology for network master plans and network development plans (separate presentation) • Reliability guideline

10. Standards and guidelines (in draft) • Network planning philosophy • Lines and cables • Transformers • Geo-based load forecasting • Unbalanced network technologies

11. Training & Development Three modules targeted for Completion within 6months ECSA accreditation In parallel also started a Specialist development program

12. Management support • Industry Association Resource Centre (IARC) support • National Network Integration Forum (NNIF) • Master planning • Funding • Reporting

13. Concluding remarks • Intended to make a step-change in the quality and effectiveness of Eskom Distribution Network Planning • Result in well trained planners, with the data they require at their fingertips, utilising systems and tools that enhance their effectiveness and assist in the implementation of guidelines and standards • Benefit is intended to be realised Industry wide • Standards and guidelines are available via DT website