The Environment, Transport and Works Bureau has requested all government
departments to reduce electricity consumption by 1.5% per year over
four years from fiscal year 2003/04, representing a total 6% reduction.
The EPD will have difficulty meeting this target. We can reduce
energy consumed by lighting, but many of our offices are in buildings
with central air-conditioning over which we have little control.
Through building management committees, the EPD, Government Property
Agency and other departments sitting on the committee have agreed
to reduce air-conditioning in offices in the early mornings and
late afternoons to reduce energy consumption. In certain buildings,
where the situation permits, some lifts have been turned off in
non-peak hours to save electricity (for example, Revenue Tower).
The results of these initiatives will be followed up in the next
The Departmental Environment, Safety & Health Committee has
resolved to step up energy saving measures through further staff
awareness and action programmes. Many EPD staff who work in cellular
rooms have voluntarily switched off overhead lights and now use
table lamps, which consume less energy. In a pilot study , half
of the lights in four corridors of Revenue Tower, totalling about
200 tubes, have been switched off without compromising occupational
safety and health standards. An energy audit of other offices is
Island West Transfer Station, where the sole occupant is the EPD,
an energy reduction scheme was implemented in 2003. Electricity
consumption was reduced by 4% from 683 680 KWh in 2002 to 655 920
KWh in 2003.
consumption for office operations
Experiment in Saving Energy
Air-conditioning systems are our major consumers of energy. The
Energy Efficiency Office of the Electrical and Mechanical Services
Department has observed that further improvement in energy saving
is possible through the use of variable speed drives (VSD) instead
of inlet guide vanes (IGV) in the air-handling unit (AHU) on each
floor. The EPD took this suggestion on board and installed VSDs
in the air-handling units of the 25th to 28th floors of Southorn
Centre. The installation was completed in March 2003.
The VSDs ran parallel with the existing system for six months from
April to September 2003 to compare the performance in energy efficiency
of the IGVs and the VSDs. Separate meter-reading was taken with
and without the operation of the VSDs during the trial period. Based
on an analysis by the Architectural Services Department, savings
in energy consumption were 27.86% on average when the VSDs were
in use. Given the encouraging results, EPD invited the Government
Property Agency to consider extending this experimental project
to other floors of Southorn Centre or other government buildings
if resources permit.
A number of measures have been introduced to control emissions and
lower fuel consumption from the department’s fleet. All EPD
vehicles – mainly medium vans, saloons, and motorcycles –
run on petrol or liquefied petroleum gas, rather than the more polluting
diesel fuel. A non-idling policy is in place to reduce air pollution.
Over the years, all EPD groups and offices have been required to
combine trips whenever possible. A transport booking system is in
place to log the mileage and number of passengers for each car trip.
The information gathered facilitates more flexible deployment of
vehicles amongst groups. Riding on the success of reducing the departmental
fleet from 61 vehicles to 56 in 2002, one more van has been identified
in 2003 to be surplus to the requirements of the department. The
van is now serving as a stop-gap measure before several replacement
vehicles are delivered to the department. In due course, it will
be returned to the Government Logistics Department for deployment
to other departments. The departmental fleet will then be further
reduced from 56 to 55 vehicles.