Media Briefing Damage to Majuba power station coal storage silo 03 November 2014 Tshediso Matona Chief Executive
Introduction Majuba power station incident The system outlook and plan Conclusion 2
Introduction Majuba power station incident The system outlook and plan Conclusion 3
Majuba power station situated in the Mpumalanga Province It is the youngest commercially operated power station in the fleet Majuba 4
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 low 5
Sequence of events (1 November 2014) 1 November 2014 All Majuba power station units were running normally, contracted loads Approximately 12:30 Operating staff reported a visible crack on silo 20 Immediately thereafter all personnel working in the area evacuated Station output immediately reduced from 3 600 MW to 1800 MW and currently running at 600 MW No injuries reported. The area was secured and protected 13:12 Silo 20 collapsed
Majuba silo
Majuba response Senior Engineers and members of the Executive Committee immediately joined the Power Station manager on-site The situation is being constantly monitored and progress updates on contingency plans will be communicated Eskom triggered its Emergency Command Centre. First priority was to protect the power grid and look at the impact of power supply to the country The cause and cost are yet to be determined as the incident is now under investigation Arrangements 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 halfload As a result of the early evacuation no injuries were reported
Introduction Majuba power station incident The system outlook and plan Conclusion 9
Majuba Max burn rate per Unit, 375 T/h. Station burn rate, 54 000 T/day Coal Supply to the Unit, (boiler Incline conveyer) 800T/h Over silo link Conveyers, 1200T/h Main Supply, Coal from Coal Stock Yard, (Overland conveyers), 2 250 T/h
Majuba Coal stockyard
Majuba
Majuba
Introduction Majuba power station incident The system outlook and plan Conclusion 14
Summer 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 15
00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00 Summer profile continued Summer poses a different challenge as the profile looks flat and our planned maintenance (PCLF) increases significantly compared to Winter 34000 32000 Constrained all day 30000 28000 26000 24000 Summer 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 difference 22000 16
Impact of renewable generation on the system Overlap of renewable generation and OCGT for one week 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 high The 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 September hourly Solar (PV) and Wind 17
Sunday: No loss of additional MW and Majuba at 600MW output Keeping to scheduled hours at Palmiet and Drakensberg. Date Time Current Avail Cap (Incl Primary Constraints) MW Expected to Return/Go Off Forecast Shortfall/Surplus on demand 02/11/2014 00:00 to 01:00 27440 0 22411 5029 02/11/2014 01:00 to 02:00 27440 0 22021 5419 02/11/2014 02:00 to 03:00 27440 0 21835 5605 02/11/2014 03:00 to 04:00 27440 0 21717 5723 02/11/2014 04:00 to 05:00 27440 0 21894 5546 02/11/2014 05:00 to 06:00 27440 0 22527 4913 02/11/2014 06:00 to 07:00 27890 0 23982 3908 02/11/2014 07:00 to 08:00 28590 0 25945 2645 02/11/2014 08:00 to 09:00 28590 0 27449 1141 02/11/2014 09:00 to 10:00 28590 0 27857 733 02/11/2014 10:00 to 11:00 28590 0 27699 891 02/11/2014 11:00 to 12:00 28590 0 27606 984 02/11/2014 12:00 to 13:00 28590 0 27407 1183 02/11/2014 13:00 to 14:00 28590 0 26817 1773 02/11/2014 14:00 to 15:00 28590 0 26181 2409 02/11/2014 15:00 to 16:00 28590 0 26011 2579 02/11/2014 16:00 to 17:00 28590 0 26155 2435 02/11/2014 17:00 to 18:00 28590 0 26674 1916 02/11/2014 18:00 to 19:00 28590 0 27902 688 02/11/2014 19:00 to 20:00 28790 0 29491-701 02/11/2014 20:00 to 21:00 28590 0 28155 435 02/11/2014 21:00 to 22:00 28590 0 25785 2805 02/11/2014 22:00 to 23:00 27690 0 24036 3654 02/11/2014 23:00 to 00:00 27440 0 22690 4750 18
Monday: Units return as expected and Majuba at 600 MW output Keeping to scheduled hours at Palmiet and Drakensberg. Date Time Current Avail Cap (Incl Primary Constraints) MW Expected to Return/Go Off Forecast Shortfall/Surplus on demand 03/11/2014 00:00 to 01:00 27440 679 22217 5902 03/11/2014 01:00 to 02:00 27440 1358 21921 6802 03/11/2014 02:00 to 03:00 27440 1358 21856 6867 03/11/2014 03:00 to 04:00 27440 1358 22265 6458 03/11/2014 04:00 to 05:00 27440 1451 23591 5132 03/11/2014 05:00 to 06:00 28590 1543 26898 2975 03/11/2014 06:00 to 07:00 28590 1543 28346 1527 03/11/2014 07:00 to 08:00 28590 1543 27931 1942 03/11/2014 08:00 to 09:00 28590 1543 28676 1197 03/11/2014 09:00 to 10:00 28590 1543 28835 1038 03/11/2014 10:00 to 11:00 29040 1543 29146 1177 03/11/2014 11:00 to 12:00 29040 1543 29057 1266 03/11/2014 12:00 to 13:00 29040 1543 29019 1304 03/11/2014 13:00 to 14:00 28840 1543 28820 1303 03/11/2014 14:00 to 15:00 29090 1543 28882 1491 03/11/2014 15:00 to 16:00 28590 1543 29382 491 03/11/2014 16:00 to 17:00 28590 1543 29621 252 03/11/2014 17:00 to 18:00 29240 1543 29878 905 03/11/2014 18:00 to 19:00 29990 1543 30868 665 03/11/2014 19:00 to 20:00 29990 1543 31317 216 03/11/2014 20:00 to 21:00 29990 1543 30157 1116 03/11/2014 21:00 to 22:00 28590 1543 27986 1887 03/11/2014 22:00 to 23:00 28590 1236 25914 3652 03/11/2014 23:00 to 00:00 27890 928 24569 3989 19
Outlook 1. 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 20:00 20
Outlook continued 3. 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
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 10pm 1. Switch off air-conditioning or use efficiently - Set air-conditioning at 23 degrees 2. Switch off all geysers and pool pumps all day until 10pm 3. Switch off all non-essential lighting 4. Respond to the Power Alert messages by switching off all appliances that are not being used 22
Introduction Majuba power station incident The system outlook and plan Conclusion 23
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
Thank you 25