Stephen DelportChief Engineer: Metering, Vending and Tariffs

City of EkurhuleniSouth Africa

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THE FORMAT OF THIS PRESENTATION

• The presentation is built around graphical information, providing a technical picture

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Map indicating the position of Ekurhuleni in Gauteng

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Objective of the AMR online System

• The automatic meter reading online system for the City of Ekurhuleni must contribute its objectives to meet the needs of its valued customers and to support a cooperative and effective relationship.

• To achieve a leading position with regard to the key competencies (including online meter monitoring and billing customers).

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Historical background

• The City of Ekurhuleni General Manager: Mark Wilson, committed to pilot an AMR online meter monitoring system, this as far back 1998,

• This was a first advanced metering system for large power users which was piloted using meteringonline.

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On-Line Communication System

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Testing of meters

• Each and every new meter installed is first calibrated by a SANAS accredited laboratory before being put to use.

• Certificates of calibration are made available to the customer on request.

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NRS 057 Energy metering; Regulatory requirements; Meters; Primary plant; Meter reading; Calibration;

Certification; Approval.

• Each metering point is comprehensively audited and certified in accordance with stringent technical requirements to ensure compliance with the South African Code of Practice for Metering, NRS 057 to ensure the integrity of the metering system and to minimise technical losses in the system.

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Electricity Statistics

• The City of Ekurhuleni has an electricity demand of more than 2 400MW with an annual purchase of electricity exceeding 10.8TWh.

• Revenue income generated from the sales of electricity is about R7.5 billion 2010/11 and will exceed R9 billion 2011/12.

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Project description

• All out-dated electromechanical and electronic meters were replaced with modern multifunction high-precision electronic meters.

• The first rollout of just over 350 metering points in Boksburg in 1998 was targeted at key customers who were encouraged to move to a Time-of-Use (TOU) tariff with financial incentives.

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Rollout of Meteringonline AMR installations

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Cumulative progress

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kWh and kVA accounted for by the Meteringonline AMR system vs. purchases from supplier Eskom

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Metering data is stored in a centralised database. This data consists of:

• Half-hourly profile data of active and reactive energy.

• Energy billing registers.

• Instantaneous voltages and currents.• Meter events and alarms such as fuse failure or tampering.

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Phasor diagram 3ph 3-wire

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Electronically summated feeders

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Online tariff related reports can be exported directly to a well know

spreadsheet application

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GERMISTON TARIFF D - LOAD FACTORS

R0-00 per kWh

Laod Factor

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(R0-00 per kWh)

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(Laod Factor)

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Monthly increase noted in Sales since implementation of online

metering monitoring

Eskom kWh Purchased 2009

Eskom kWh Purchased 2010

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Monthly kWh Sales via MOL 2010/11

Corresponding Monthly kWh Increased Sales via MOL 2010 vs previous year

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kWh MOL July 2010 1,078,602,540 1,046,606,391 97.0% 474,100,427 551,556,731 116%August 991,870,026 979,023,890 98.7% 467,257,588 530,448,053 114%September 872,374,424 880,463,196 100.9% 462,480,043 506,417,179 111%October 906,691,675 902,566,532 99.5% 477,042,524 502,232,711 105%November 891,354,673 879,515,269 98.7% 479,317,012 509,599,600 106%December 2010 779,778,740 784,172,646 100.6% 407,053,599 453,847,197 111%January 2011 822,298,281 834,529,050 101.5% 443,874,931 478,222,246 108%February 2011 792,785,509 807,431,582 101.8% 443,501,325 472,139,308 106%

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Meteringonline load profile

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Previous years difficulties experience to manage meter readings (before

implementing an outsourced AMR system

• Change of personnel

• Lack of data security

• Changes in communication infrastructure (GSM network changes, technology changes)

• Changes in operating systems (Windows 95, 2000, XP, Vista)

• Instrument changes

• New software functionality and enhancements

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Energy target graph

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Energy target indicator

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Carbon foot print

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I thank you!