2008greenhouse gas inventory - duke university greenhouse gas inventory 2008 update

2008 Greenhouse Gas Inventory - Duke University

Greenhouse Gas Inventory2008 Update


Methodology

• Utilized Clean-Air Cool-Planet software - (

www.cleanair-coolplanet.org/)

• Goals of the inventory -

– Update Duke’s 2004 GHG inventory

– Characterize the major sources and examine trends in emissions over the last 18

years

– Provide the baseline for Duke’s overall Climate Commitment Action Plan

• Boundaries of the inventory -

– “Duke proper” – University and Health System buildings on and adjacent to the

Durham campus and the Marine Lab.

– Did not include leased space or satellite health system buildings and hospitals

http://www.cleanair-coolplanet.org/


• Transportation

– Fleet fuel

• Gasoline

– University BP gas cards

– FMD purchases

– DUPD purchases

– West Campus grounds gasoline purchases

• Diesel

– Gallons sold at Transit fueling station

– Employee Air travel

• Used Duke American airlines data for FY0506, 0607 to get an average price per mile

• Took Employee Travel and Reimbursement financial data on air travel purchases / avg. price per mile

– Commuters

• Used 2006 and 2008 TTA survey data for mode share info

• Used a straight-line analysis of employee address data to estimate an average daily commute distance

Sources of GHG Emissions Inventoried


• Transportation

– Employee Air travel

• Not included in 2004 Inventory because of a lack of data

• As part of the Climate Commitment we are required to include this

– Commuters

• Used actual 2006 and 2008 TTA survey data for mode share info – 2004 numbers were estimated

• Durham Regional and Duke Raleigh employees were not included in the employee commute distances – may explain some of the reduction, 15 miles to 9.1 miles

Changes in 2008 Inventory


• Electricity

– Duke Power consumption

• Used 5 main Duke accounts, counts for 95% of the electricity usage

• Included Marine Lab

• On-Campus Stationary

– Steam Plant fuel

• Coal

• Natural Gas

• #2 Fuel Oil



• Electricity

– Duke Power consumption

• Updated emissions factors for specific Duke Energy data back to 1990

• 2004 inventory used regional average from the Southeastern Electric Reliability Council (SERC).

• On Campus Stationary

– Steam Plant fuel

• Duke uses a combination of recycled #2 fuel oil and regular #2 fuel oil, emission factors are the same – didn’t separate out

• Previous inventory didn’t have emissions factors tied to the usage of recycled #2 oil, under-reporting impact



• Refrigerants

– Estimated from FMD and E&O purchasing data minus current inventory

• Solid Waste

– Landfilled solid waste

– Incinerated medical waste

• Fertilizer

– Usage data from FMD, Washington Duke Inn, Athletics and Duke Gardens

– Nitrogen content averaged across all four sources

• Offsets

– Duke Forest preservation

• Sequestration potential hasn’t changed since 2004, forest management and size has stayed the same

– Composting

– REC purchases



• Fertilizer

– Not included in previous inventory

• Square Footage

– 2004 numbers from Plant Accounting were not consistently gross square feet

– Updated numbers back to 1990 with new gross square feet to maintain consistency



Questions?


Total Emissions (Metric Tons eCO2)

-

50,000

100,000

150,000

200,000

250,000

300,000

350,000

400,000

450,000

500,000

1990 1992 1994 1996 1998 2000 2002 2004 2006

Year

(eC

O 2

)Met

ric

To

ns

15% increase since 2004

2004 levels = 377,489

2005 levels = 416,951

2006 levels = 444,002

2007 levels = 433,961

+ 10.5%

+ 6.5%

- 2.3%


0

50,000,000

100,000,000

150,000,000

200,000,000

250,000,000

300,000,000

350,000,000

400,000,000

450,000,000

500,000,000

1990 1992 1994 1996 1998 2000 2002 2004 2006

Year

To

tal

Ca

rbo

n D

iox

ide

Em

issi

on

s (k

g C

O2

(

Purchased Electricity 53%

Steam Plant 24%

Transportation 23%

Emissions by Scope 2006-2007


2005 = 31.3 2006 = 322004 = 30.0 2007 = 31.2

kg eCO2 / Square Foot Building Space

0

5

10

15

20

25

30

35

40

1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007

Tot

al E

mis

sion

s p

er s

qu

are

foot

(kg

eCO

2 / f

t^2

)


Total Mt eCO2 vs. Net Mt eCO2

0

50,000

100,000

150,000

200,000

250,000

300,000

350,000

400,000

450,000

500,000

1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007

Year

Mt

eC

O2

Mt eC02 Net Mt eCO2

2008greenhouse gas inventory - duke university greenhouse gas inventory 2008 update

Documents