Eskom Briefing in Majuba Power Station Silo collapse

7/27/2019 Eskom Briefing in Majuba Power Station Silo collapse

1/25

Media Briefing

Damage to Majuba powerstation coal storage silo

03 November 2014

Tshediso MatonaChief Executive


2/25

2

Introduction

Conclusion

Majuba power station incident

The system outlook and plan


3/25

3

Introduction

Conclusion




4/25

Majuba power stationsituated in the Mpumalanga Province

4

Majuba

It is the youngest

commercially operatedpower station in the fleet


5/25

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 fullyoperational 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 byan 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 hassince been repaired

The risk classification was low

5


6/25

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

13:12Silo 20

collapsed

No injuries

reported.The area was

secured and

protected

Station output

immediately reduced

from3 600 MW to 1800 MW

and currently running at

600 MW


7/25

Majuba silo


8/25

Majuba response

Senior Engineers and

members of the Executive

Committee immediately

joined the Power Station

manager on-site

Eskom triggered itsEmergency Command

Centre. First priority was

to protect the power grid

and look at the impact of

power supply to the

country

Arrangements

were made for

permits to

transport mobile

coal feeders to

site to enable amanual 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-load

The cause and

cost are yet to

be determined

as the incidentis now under

investigation

As a result of the early evacuation no injuries were reported

The situation is

being constantly

monitored and

progress updateson contingency

plans will be

communicated


9/25

9

Introduction

Conclusion




10/25

Majuba

Main Supply, Coal from Coal Stock Yard,

(Overland conveyers), 2 250 T/h

Coal Supply to the Unit, (boiler Incline

conveyer) 800T/h

Max burn rate per Unit, 375 T/h. Station burn rate, 54 000 T/day

Over silo link Conveyers, 1200T/h


11/25

Majuba

Coal

stockyard


12/25

Majuba


13/25

Majuba


14/25

14

Introduction

Conclusion




15/25

15

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 cant 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 unplannedoutages

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


16/25

Summer profile continued

Summer poses a different challenge as the profile looks flat and our plannedmaintenance (PCLF) increases significantly compared to Winter

16

22000

24000

26000

28000

30000

32000

34000

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 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

Constrained all day

I t f bl ti


17/25

Renewable independent power

producers peak at over 900 MW

(about 1 274 MW installed)

As we move more into a flatter

profile, the renewables willincreasingly offset some of the

OCGT usage

IPPs (wind & solar variability)

unavailable during evening peak

when demand is high

Impact of renewable generationon the system

17September hourly Solar (PV) and Wind

Overlap of renewable generation

and OCGT for one week

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


18/25

Sunday: No loss of additional MW andMajuba at 600MW output

18

Keeping to scheduled hours at Palmiet and Drakensberg.

DateTime

Current Avail Cap (Incl Primary

Constraints)

MW Expected to Return/Go

OffForecast

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 240902/11/2014 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 365402/11/2014 23:00 to 00:00 27440 0 22690 4750


19/25

Monday: Units return as expected andMajuba at 600 MW output

19

Keeping to scheduled hours at Palmiet and Drakensberg.

DateTime

Current Avail Cap (Incl Primary

Constraints)

MW Expected to Return/Go

OffForecast

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 297503/11/2014 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 149103/11/2014 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


20/25

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 significantrecovery of the Peaking resources to ensure the impact of load shedding is lesssevere during the week

Solar & wind currently sending out 160 MW and 90 MW respectively. Solar isnormally up to 500 MW (cloudiness affecting it significantly). Majuba currentlysending 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 anyfurther breakdowns

Demand forecast for evening peak (31 317 MW highest of the day)

Risk of load shedding in particular between 18:0020:00

20


21/25

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 meanby Wednesday we start to be constrained with water

If the capacity is still at the same level we would need to considerStage 1 load shedding possibly on Thursday (whole day) or as earlyas Wednesday evening ( 46 hours)

21


22/25

How can consumers help?

Saving electricity reduces pressure on the grid and cuts your electricitybill and SouthAfricas 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 allappliances that are not being used

22


23/25

23

Introduction

Conclusion




24/25

Conclusion

While the system is tight, this unplanned incident exacerbatedthe 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 alsoinformed 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 customersshould 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


25/25

Thank you

25

Documents

Eskom Briefing in Majuba Power Station Silo collapse