| Energy conservation |
| To date, Singtel has achieved cumulative electricity savings of over 300,000 GJ from energy conservation initiatives implemented since FY2010. |
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| Energy efficiency in our networks and building operations |
Energy use from our networks and building operations accounted for 55.2% and 18% of our total energy use in FY2014 respectively.
We continued to upgrade our mobile base stations to the latest generation of ‘green’ base stations. 96% of our base stations are now more energy efficient ones. While we doubled the number of mobile base stations installed during the year, we saw over 53% savings in energy use per cell carrier since FY2012. |
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| With the successful completion of the Performance Enhancement Lighting Management System (PELMS) trial at Telok Blangah Telephone Exchange, we are extending the project to 7 other telephone exchanges and 2 satellite earth stations. Reductions in electricity use are estimated at 40% based on the trial results, potentially saving about 1,000 GJ per year. This is equivalent to 139 tCO2e reduction in our carbon footprint. |
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| Electricity use breakdown FY2014 |
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| Optimising our chillers |
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Renewable energy |
Chillers consume a large amount of energy and we therefore monitor them very closely. We recognise a need to overhaul mid-life chillers and revert their operating efficiency to their respective design value.
4 chillers were overhauled during the year, resulting in energy savings of 2,340 GJ.
This is equivalent to a reduction of 323 tCO2e.
We have also continued the cyclical replacement of aging chillers, targeting those
that have been in operation for 15 years or more. In FY2014, 2 units of 400RT
chillers were replaced with energy efficient ones. The efficiency of the new system
is designed at 0.77KW/RT, resulting in an improvement of 14% in electricity
consumption compared to existing units. A reduction of 1,254 GJ was achieved, with
a carbon footprint reduction of 173 tCO2e.
We plan to replace 5 more units of chillers located at 2 telephone exchanges
in FY2015. This project will yield an estimated reduction of 1,500 GJ annually,
translating to a further reduction in carbon footprint by 209 tCO2e per year. |
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Singapore’s geographical location makes solar photovoltaic technology a promising
option as a source of renewable energy due to an average annual solar irradiation
of 1,150 kWh/kWp/year and about 50% more solar radiation than temperate
countries[1]. We constantly explore opportunities to utilise solar energy for our
operations to reduce our reliance on fossil fuels.
As a result of the successful completion of a solar panel feasibility study at Seletar
Satellite Earth Station in 2012, we will commission another 2 photovoltaic projects at
Pulau Ubin Microwave Station and Seletar Satellite Earth Station (SSES).
Both projects are estimated to be completed by
end-2014.
In 2009, we piloted a Grid-Tied Solar Photovoltaic System at Pasir Ris Telephone
Exchange where 192 photovoltaic panels were installed on the roof to support our
power consumption for computers and the building’s lighting system. In 2011, we
commissioned a renewable energy system at the Bukit Timah Hill Radio Station
comprising 100 pieces of solar panels and 3 wind turbines to supplement energy
from the national power grid.
[1] Source: http://www.ema.gov.sg/page/32/id:65/
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