UTILITY LOAD MANAGER

AMEU Convention

Dr Vic Lawrence

27 October 2010

BACKGROUND

• In 2001 Eskom planned for our current and future supply and

demand needs – Government was informed.

• In 2005 Eskom fast tracked the build program, when the IPP

strategy failed.

• In 2007 load shedding inevitable due to supply and demand

constraints.

• Supply and demand constraints will persist with current

network constraints

BACKGROUND

• Eskom reduced loads within their control – Mining and

Industry load reduction by 10%.

– Loads within Eskom’s control:

• Large Power Users (LPUs).

• 120, 000 residential customers (LSM 5 to 10).

• 3.5 million Prepaid customers.

• Residential load shedding was introduced through

municipalities.

• Eskom accelerated DSM, the National DSM programs.

Basic Demonstration Of the Utility Load Manager

(ULM)

Consumption data (updated every 2.5 min)

PLC PLC

Kiosk

Limits can be set depending on need

5A,10A,20A....

Load limit set by control centre

Behavior Change

ControlFlexibility

Scalability

Limiting Threshold

5A = 1100W

Application Watts

Refrigerator with freezer 550

Computer 120

Lighting: energy saving lamp [X5 CFL’s] 55

M-net decoder 28

Television 70 cm colour 100

Video recorder 35

DVD Player 14

Home security and electric fence 100

Total Usage 1002

ULM COMPLIANCE

• The ULM system has passed the requisite tests at SANS

(NETFA):

• Endurance tests (over 10 000 operation cycles)

• Impulse

• Short circuit (10kA)

• surge tests

• The ULM system conforms to metering requirements:.

• Consumption data can be used as credible billing data.

• TOU capability

• The ULM fully complies with the amendment to the Electricity

act that was gazetted on 18 July 2008.

• SABS accreditation

Product Manufacture

Product test and assembly

Product Development and Testing

Installation of ULM

Final Field Installation

Original installation ULM installed

Final Field Installation

Final Field Installation

Final Field Installation

The graph provides a view of the load limiting console during a load limiting period. The information on

this console is updated every 2½ minutes. The console display includes the scheduled limits as well as a

graphical representation historically of the power that has been saved.

1

6

0

50

100

150

200

250

300

350

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

Actual

Base_Line

Tuesday 27 OctoberTuesday 27 October

18h0006h00 12h00 24h00

290 kW

Limit Imposed: 18h00 – 20h00 @ 2 kW per house

125 kW

Average savings from 158 customers during limiting: 165 kW

Extrapolate to Eskom’s residential customer base of 120 000 customers: 125 MWA

ve. S

av

ing

s

Demand settles to a point below

the limit after 10 - 15min

Drop in demand at

start of limitingSlight comeback

load

Increase in demand

at end of limiting

17

Thursday 28 OctoberThursday 28 October

0

50

100

150

200

250

300

350

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

Actual

Base_Line

18h0006h00 12h00 24h00

280 kW

Limit Imposed: 18h00 – 20h00 @ 3 kW per house step to 1.1 kW per house

115 kW

Average savings during limiting – Step 1: 165 kW (148 customers)

Extrapolate to Eskom customer base of 120 000 customers: 134 MW

Savin

gs 1

85 kW

250 kW

Savin

gs 2

Average savings during limiting – Step 2: 165 kW (148 Customers)

Extrapolate to Eskom customer base of 120 000 customers: 134 MW

18

Friday 28 OctoberFriday 28 October

0

50

100

150

200

250

300

350

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

Actual

Base_Line

06h00

200 kW

Limit Imposed: 10h00 – 13h00 @ 2 kW per house

65 kW

Average savings during limiting: 135 kW (139 Customers)

Extrapolate to Eskom customer base of 120 000 customers: 116 MW

Savin

gs

12h00 18h00 24h00

IMPACT AND BENEFIT

• No black-outs or load shedding

• Restore Customer confidence

• Revenue management and protection

• Direct control over local network and systems

• Buffer for Generation new Build

• 20 MW power reduction just from pilot

• 6750 MW available with National implementation (1.5 Power stations)

• Buffer for system Ops reserve margin 3-5 % - 18-20%

• Planned outages

• Less unplanned outages

IMPACT AND BENEFITIMPACT AND BENEFIT

Distribution

•Revenue management and protection

•On line real time energy balancing

•No meter reading

•Accurate real time Billing data

•T0U provision

•On line network fault detection

– Real time reading

– Alarming

– Gps coordinated

– Unique notification/messaging

•Load profile per household can be available on web

Thank you

?