Eskom load shedding
Eskom CEO Tshediso Matona confirmed that load shedding would continue for a week, due to the collapsed silo at the Majuba power station.
2. 2IntroductionConclusionMajuba power station incidentThe system outlook and plan 3. 3IntroductionConclusionMajuba power station incidentThe system outlook and plan 4. Majuba power station – situated in the Mpumalanga Province4MajubaIt is the youngest commercially operated power station in the fleet 5. Majuba Power Station•Majuba Power Station, situated in Mpumalanga, has an installed capacity of 4110 MW generated•The station is 13 years old and became fully operational in 2001 when the last of its six units came on line•Three, 10 000 ton coal storage silos were constructed in 1994•The latest civil visual inspection was conducted in September 2013 by an external specialist, in line with best practice•The concrete structure was found to be in good condition.•Some moderate cases of external physical damage that was reported has since been repaired•The risk classification was low5 6. Sequence of events (1 November 2014)1 November 2014 All Majuba power station units were running normally, contracted loadsApproximately 12:30Operating staff reported a visible crack on silo 20Immediately thereafter all personnel working in the area evacuated13:12Silo 20 collapsedNo injuries reported.The area was secured and protectedStation output immediately reduced from 3 600 MW to 1800 MW and currently running at 600 MW 7. Majuba silo 8. Majuba responseSenior Engineers and members of the Executive Committee immediately joined the Power Station manager on-siteEskom triggered its Emergency Command Centre. First priority was to protect the power grid and look at the impact of power supply to the countryArrangements were made for permits to transport mobile coal feeders to site to enable a manual feed of coal to five of the six units. This to ensure that the power station is able to operate at a minimum of half- loadThe cause and cost are yet to be determined as the incident is now under investigationAs a result of the early evacuation no injuries were reportedThe situation is being constantly monitored and progress updates on contingency plans will be communicated 9. 9IntroductionConclusionMajuba power station incidentThe system outlook and plan 10. MajubaMain Supply, Coal from Coal Stock Yard,(Overland conveyers), 2 250 T/hCoal Supply to the Unit, (boiler Incline conveyer) 800T/hMax burn rate per Unit, 375 T/h. Station burn rate, 54 000 T/dayOver silo link Conveyers, 1200T/h 11. MajubaCoal stockyard 12. Majuba 13. Majuba 14. 14IntroductionConclusionMajuba power station incidentThe system outlook and plan 15. 15Summer profile•The system remains tight in summer, with different challenges due to the load profile•Unlike winter, where the demand increases significantly during the evening peak (5pm - 9pm), the demand profile during summer is much flatter with an increased demand profile throughout the day•This is because of a relatively high percentage of almost constant industrial load and the impact of air conditioning in the commercial and marginally in the residential sector during the day. The significant residential component over evening peak is not as evident in summer. If there is a constraint, the system is constrained all day•Summer is typically maintenance season, but this summer maintenance will increase based on the generation strategy as most of the maintenance is fixed and can’t be deferred.•The challenge is to ensure that there is sufficient generation capacity throughout the day, as we continue with our maintenance plan and focus on reducing unplanned outages•The degree of tightness will depend on the performance of the plant and the level of unplanned maintenance (UCLF) as well as the available capacity•Eskom will not compromise its generation plant and will load shed if necessary to protect the power system from total collapse 16. Summer profile continued•Summer poses a different challenge as the profile looks flat and our planned maintenance (PCLF) increases significantly compared to Winter162200024000260002800030000320003400000:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00Summer points to note•Table Mountain profile•Constrained all day incl. from 6am - 10pm•Air-conditioning, geysers & pool pumps primarily impact demand•Commercial, agricultural & residential customers can make the biggest differenceConstrained all day 17. •Renewable independent power producers peak at over 900 MW (about 1 274 MW installed)•As we move more into a flatter profile, the renewables will increasingly offset some of the OCGT usage•IPPs (wind & solar variability) unavailable during evening peak when demand is highImpact of renewable generation on the system17September hourly Solar (PV) and WindOverlap of renewable generation and OCGT for one weekThe situation today has been exaggerated by the generally cloudy conditions across the entire country which has reduced the supply from solar plants by almost 500 MW 18. Sunday: No loss of additional MW and Majuba at 600MW output18Keeping to scheduled hours at Palmiet and Drakensberg.DateTimeCurrent Avail Cap (Incl Primary Constraints)MW Expected to Return/Go OffForecastShortfall/Surplus on demand02/11/201400:00 to 01:0027440022411502902/11/201401:00 to 02:0027440022021541902/11/201402:00 to 03:0027440021835560502/11/201403:00 to 04:0027440021717572302/11/201404:00 to 05:0027440021894554602/11/201405:00 to 06:0027440022527491302/11/201406:00 to 07:0027890023982390802/11/201407:00 to 08:0028590025945264502/11/201408:00 to 09:0028590027449114102/11/201409:00 to 10:002859002785773302/11/201410:00 to 11:002859002769989102/11/201411:00 to 12:002859002760698402/11/201412:00 to 13:0028590027407118302/11/201413:00 to 14:0028590026817177302/11/201414:00 to 15:0028590026181240902/11/201415:00 to 16:0028590026011257902/11/201416:00 to 17:0028590026155243502/11/201417:00 to 18:0028590026674191602/11/201418:00 to 19:002859002790268802/11/201419:00 to 20:0028790029491-70102/11/201420:00 to 21:002859002815543502/11/201421:00 to 22:0028590025785280502/11/201422:00 to 23:0027690024036365402/11/201423:00 to 00:00274400226904750 19. Monday: Units return as expected and Majuba at 600 MW output19Keeping to scheduled hours at Palmiet and Drakensberg.DateTimeCurrent Avail Cap (Incl Primary Constraints)MW Expected to Return/Go OffForecastShortfall/Surplus on demand03/11/201400:00 to 01:002744067922217590203/11/201401:00 to 02:0027440135821921680203/11/201402:00 to 03:0027440135821856686703/11/201403:00 to 04:0027440135822265645803/11/201404:00 to 05:0027440145123591513203/11/201405:00 to 06:0028590154326898297503/11/201406:00 to 07:0028590154328346152703/11/201407:00 to 08:0028590154327931194203/11/201408:00 to 09:0028590154328676119703/11/201409:00 to 10:0028590154328835103803/11/201410:00 to 11:0029040154329146117703/11/201411:00 to 12:0029040154329057126603/11/201412:00 to 13:0029040154329019130403/11/201413:00 to 14:0028840154328820130303/11/201414:00 to 15:0029090154328882149103/11/201415:00 to 16:002859015432938249103/11/201416:00 to 17:002859015432962125203/11/201417:00 to 18:002924015432987890503/11/201418:00 to 19:002999015433086866503/11/201419:00 to 20:002999015433131721603/11/201420:00 to 21:0029990154330157111603/11/201421:00 to 22:0028590154327986188703/11/201422:00 to 23:0028590123625914365203/11/201423:00 to 00:0027890928245693989 20. Outlook1. Sunday•Sunday shedding at Stage 2 will build up reserves for the week ahead•The current projection is to keep load shedding Stage 2 to ensure significant recovery of the Peaking resources to ensure the impact of load shedding is less severe during the week•Solar & wind currently sending out 160 MW and 90 MW respectively. Solar is normally up to 500 MW (cloudiness affecting it significantly). Majuba currently sending out about 600 MW (2 machines at half load)2. Monday projection•Generation Capacity at 31 500 MW for the day, provided we do not have any further breakdowns•Demand forecast for evening peak (31 317 MW highest of the day)•Risk of load shedding in particular between 18:00 – 20:0020 21. Outlook continued3. The rest of the week•If the capacity stays at the same level, we would have similar system status. With the extensive usage of the water resources it would mean by Wednesday we start to be constrained with water•If the capacity is still at the same level we would need to consider Stage 1 load shedding possibly on Thursday (whole day) or as early as Wednesday evening ( 4 – 6 hours)21 22. How can consumers help?•Saving electricity reduces pressure on the grid and cuts your electricity bill and South Africa’s carbon emissions•The power system remains vulnerable all day up to 10pm1.Switch off air-conditioning or use efficiently- Set air-conditioning at 23 degrees2.Switch off all geysers and pool pumps all day until 10pm3.Switch off all non-essential lighting4.Respond to the Power Alert messages by switching off all appliances that are not being used22 23. 23IntroductionConclusionMajuba power station incidentThe system outlook and plan 24. Conclusion•While the system is tight, this unplanned incident exacerbated the situation and it is very likely that load shedding will continue for the week•An investigation is already underway into the cause of the incident, but it appears that this is an isolated incident specific to the coal infrastructure at Majuba.•Mobile coal feeders are on-site and the team is optimistic that they can maintain half of the total from the power station•The Minister of DPE is being kept abreast of all developments. Eskom has also informed all key stakeholders including the Department of Education and the national disaster management centre to minimise the impact for matriculants and all communities•Eskom apologises to all electricity consumers but call on you yet again to switch off unnecessary lights, the geyser, pool pump and air-conditioning•Load shedding schedules are available on Eskom website, and municipal customers should contact their municipalities for details•We are painfully aware of the impact of this incident given the electricity supply situation in the country•We will continue to communicate via the media 25. Thank you25
- 1. Media Briefing Damage to Majuba power station coal storage silo 03 November 2014 Tshediso Matona Chief Executive