Purely by chance, the first unit at the Medupi coal-fired power station came on line in 2015, the same year that wind and solar from the renewable energy independent producers procurement programme bid window 1 came on line. Since 2015, additional units from Medupi have come on line at an average of one per year. The sixth and last unit is due to come on line in February 2021, five and a half years after the first unit.
Table 1. Key operational and cost data for Medupi coal-fired power station. # Effective MW takes into account the month in which each new unit was commissioned in each particular year. Operational and cost data sourced from Eskom. Some data has been smoothed over the period. Cumulative capex spend is estimated, but locked in to 2020 cost data as supplied by Eskom. Final cost estimates are by the author, not from Eskom.
The result of this is that the electricity output from the first of the generating units is very expensive on a cost per kWh basis; it has to shoulder the full capital cost of the shared balance of plant infrastructure on its own.shows how the output from Medupi ramps up over time as each additional generating unit is added. Medupi should achieve full expected capacity of approximately 30TWh/year by 2022.also shows increased output from wind and solar PV additions over time.
Table 2. Comparative table for the six stages of Medupi to four actual and two hypothetical bid windows for wind and PV. Note that there were no bid windows for delivery of PV and wind in 2018 and 2019. By 2022, annual TWh is equal for Medupi, PV and wind at 30TWh/year.
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