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| Copyright © 2013 Singtel (CRN: 199201624D). All Rights Reserved |
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| 7.2 MANAGE EFFICIENT ENERGY CONSUMPTION |
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| In a country lacking natural resources, energy efficiency has become a
strategic priority for Singapore. For this reason, a regulatory focus led to the
Energy Conservation Act of 2012 which came into force in 2013. Although
the legislation is not applicable to Singtel, we measure, manage and
report on our energy use, and continue to focus on improving our energy
management through the implementation of various efficiency initiatives. |
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| Energy conservation |
| Singtel pledged to
cumulatively save 32.7 GWh of electricity from energy conservation
initiatives implemented in FY2010 over the period FY2011 to FY2013. |
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| A range of energy efficiency and management measures has been introduced,
including a programme of energy audits, optimisation, replacement and overhaul
of chillers and lighting systems. We also leverage our environmental campaign
Project LESS (Little Eco StepS) to raise staff awareness. |
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| To date, Singtel has achieved cumulative electricity savings of 59.6 GWh far
exceeding the target set in FY2010. Additional savings of 6.3 GWh
was achieved from projects commissioned and completed in FY2013. This is equivalent to 1.8% of our total energy consumption
for the year and translates into a reduction of our carbon footprint by 3,226
tCO2e emissions. Moving forward, we will roll out a new set of five-year
energy conservation programme and set new energy reduction targets. |
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| In line with our targets for FY2013, eight audits were conducted at
exchanges in Singapore: Central, Changi, Hougang, Jurong East, Katong,
North, Queenstown and Telok Blangah Telephone Exchanges. The results
gave us a good understanding of the operations at each of our exchanges
and will provide a basis for planning improvements moving ahead. Since the
beginning of our programme in 2006, energy audits have been conducted at
all of our office premises and 22 network exchanges. |
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| Energy efficiency and management |
Chiller optimisation and overhaul
Chiller plant optimisation seeks to optimise the entire air-conditioning
operation of a building in real-time by controlling every major component
of the air-conditioning system to respond to changes in the ambient
environment and space cooling demand. By responding to real-time
ambient conditions, over-cooling is avoided thus saving energy. |
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| The optimisation of the chiller plant at the Serangoon North building was
completed in October 2012. The reduction in annual electricity consumption
is estimated to be 324,000 kWh, equivalent to 167 tCO2e, with an investment payback of 21 months. |
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| Chiller efficiency is another focus area as each chiller’s performance
deteriorates over time. Notwithstanding routine maintenance, a mid-life
overhaul can bring a chiller closer to its operating design efficiency. |
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| We commenced the overhaul of 10 chillers during the year, completing
seven by end of FY2013 with the remaining three targeted for completion by May 2013. |
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| Upon completion of this initiative, the total energy savings is
estimated to be more than 880,000 kWh per year, equivalent to
a 455 tCO2e. The payback period for each
chiller is 25 months. |
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Performance Enhancement Lighting Management System (PELMS)
In 2012, Singtel conducted a trial of the Performance Enhancement Lighting
Management System (PELMS) at the 2nd level of Telok Blangah Exchange.
This included corridors, the Main Distribution Frame (MDF) room and
equipment rooms. PELMS allows the lighting level to be automatically
managed based on detection technology to assess the presence or absence
of people. The average energy savings achieved was around 45%. |
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| PELMS is being extended to the remaining areas within the exchange.
The estimated energy savings is 128,910 kWh per annum, equivalent to a 66 tCO2e, with a payback
period of just over 16 months. The reduction is about 4% of Telok Blangah
Exchange’s annual energy consumption. |
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| Indirect energy use |
| Singtel’s indirect energy usage includes all of our owned premises, rented offices, mobile base stations and MDF rooms. Overall, Singtel consumed 344.58
GWh in FY2013, a marginal increase compared to 341.30 GWh in FY2012. This slight increase is mainly due to the installation of more mobile base stations
to support the growing needs of our customers. However, the energy consumption did not increase correspondingly due to the installation of more energy
efficient mobile base stations (see story below). |
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| For the 2nd year, we have provided information on energy usage by operation. The majority of our usage comes from networks[1], accounting for 53% of the
total electricity use. The distribution of energy has been constant the past four years, with a slight decrease in percentage of energy use in offices and a
corresponding increase in data centres and networks. |
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Energy Use
(GWh) |
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| [1] Our network operations include telephone exchanges, main distribution frame rooms and mobile base stations. |
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Indirect Energy Use Distribution
in FY2013 |
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| Energy efficient mobile base stations |
| In an effort to reduce energy consumption via our networks, an initiative implemented in FY2013 was to upgrade our mobile base stations to the latest
generation of ‘green’ base stations (Ericsson 6000 series). |
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| As at 31 March 2013, 87% of all our mobile base stations (new and upgraded) have been converted to more energy efficient ones. The remaining 13% are
in the process of conversion. |
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| Although total energy usage by mobile base stations increased slightly by 5 GWh to 38 GWh in FY2013, we achieved a 48% savings in energy use per cell
carrier due to more energy efficient base stations. |
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