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[The following was submitted to the Chronicle-Herald on 5 May 2005. It
was not published.]
When asked about Emera's greenhouse gas emissions, CEO Chris Huskilson was
quoted as saying that his company's rate of emissions is "pretty flat
right now" (Herald, 4 May).
Greenhouse gas emissions from electrical generation come primarily from
burning fossil fuels, notably coal, oil, and natural gas. When each of
these fuels is burned in a power station, they emit a quantity of carbon
dioxide (a greenhouse gas) for every kilowatt-hour of electricity
generated; the amount differs for each fuel, depending upon the "carbon
intensity" of the fuel: coal (about 0.85 kg/kWh), oil (about 0.79 kg/kWh),
and natural gas (about 0.5 kg/kWh).
According to Emera's 2004 Annual Financial Report, the total volume of
electricity produced by NSPI in 2002, 2003, and 2004 was 12,031 GWh
(gigawatt-hours or one million kilowatt-hours), 12,329 GWh, and 12,565
GWh, respectively. The volume of electricity by fuel per year (from the
2004 Financial Report) and the corresponding quantity of carbon dioxide
emitted per year was:
* In 2002, coal (8,862 GWh), oil (288 GWh) and natural gas (1,579
GWh); resulted in carbon dioxide emissions of about 8.5 million tonnes.
* In 2003, coal (9,219 GWh), oil (1,536 GWh) and natural gas (119
GWh); carbon dioxide emissions increased to 9.1 million tonnes.
* In 2004, coal (9,490 GWh), oil (1,698 GWh), and natural gas (97
GWh); annual carbon dioxide emissions rose to about 9.4 million tonnes.
Between 2002 and 2004, NSPI's carbon dioxide emissions rose by almost one
million tonnes or about 10.6 percent. How anyone can call this "pretty
flat" is unclear.
Larry Hughes, PhD
Professor
Department of Electrical and Computer Engineering
Dalhousie University
Halifax, Nova Scotia, B3J 2X4
Canada
v: 902.494.3950
f: 902.422.7535
e: larry.hughes@dal.ca
u: http://lh.ece.dal.ca *** NEW ***
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