Basic HTML Version
0
5
10
15
20
25
MT/TJ
0
2
4
6
8
10
12
kg/TJ
0
0.1
0.2
0.3
0.4
0.5
0.6
kg/TJ
CO
2
Emission Level
NO
X
Emission Level
SO
X
Emission Level
10 09 08 07
2011
10 09 08 07
2011
10 09 08 07
2011
Equivalent Licensing Limit
2
altered after mid-2006
Equivalent Licensing Limit
2
Design Limit
1
altered after mid-2006
33
Sustainability Report 2011
Natural Gas
The journey to cleaner energy began in 1967 when coal was no longer used in the gas
production process. The first major difference took place in 1973 when naphtha began
to replace the heavy oil then being used in Hong Kong. Because of its much lower
sulphur content, this move reduced the emission of sulphur dioxide significantly. Yet
another watershed occurred in 2006, when we began using natural gas as a feedstock.
Natural gas significantly reduces pollutant emissions such as carbon dioxide (CO
2
),
nitrogen oxide (NOx) and sulphur oxide (SOx), which means improved air quality for
Hong Kong while the reduced emissions mitigate against climate change and global
warming concerns.
Over the years this use of natural gas has risen steadily, currently accounting for around
60% of our total feedstock. This figure will grow yet again when the pipeline bringing
natural gas to our Ma Tau Kok production plant is completed. We expect this to take
place in 2012.
Emission Levels of Gas Production Plants (Hong Kong)
With natural gas providing the basis for our city-gas operations on the mainland, the
emission of greenhouse gases is minimal. As natural gas, in line with governmental
policies, is being seen as the leading “clean fuel” in the foreseeable future and as our
portfolio of city-gas businesses continues to expand, we see our activities as making a
significant contribution towards a cleaner and greener economy for the country.
Environmental Performance Clean Energy
Note:
1. As there is no Licensing Limit for the emission levels of the substance, we apply the design limit
of our production plants as a reference point for the emission level.
2. “Equivalent Licensing Limit” (kg/TJ OR m
3
/TJ) = “Weighted average of actual licensing limit”
(kg/hr or m
3
/hr) ÷ production rate of the plants for the year 2010 (TJ/hr).