Emission Reduction
Partnership for
Electric Power
Systems
Si PA
.1 SF6 Emission Reduction
Partnership for Electric Power Systems
United States
Environmental Protection
Agency
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1999
Inception of the "Partnership" with 49 Charter Partners.
2000
1 st International Conference on SF6 and the Environment
held in San Diego, CA.
2001-2003
Technical literature developed and made available on program Web site
including, "Byproducts of SF6 Use in the Electric Power Industry" and
"Catalog of Guidelines and Standards for the Handling
and Management of SF6."
2nd International Conference on SF6 and the Environment
held in San Diego, CA in 2002.
2004
3rd International Conference on SF6 and the
Environment held in Scottsdale, AZ (substation tour).
Partners start receiving customized benchmark reports on their
progress in the program. Service Provider directory made available.
2005
Webcast tutorials on estimating and reporting SF6 emissions offered.
Field study on leak rates from circuit breakers manufactured between
January 1998 and December 2002 is completed.
2006
4th International Conference on SF6 and the Environment held in
San Antonio, TX (substation tour). Partnership participation increases to
77 companies representing 42% of U.S. grid.
2007
The SF6 emission rate dropped to 5.5 percent; Partners have reduced
SF6 emissions by more than half of baseline emissions.
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The SF6 Emission Reduction
Partnership for Electric
Power Systems
The United States Environmental
Protection Agency (EPA) manages numerous
voluntary public-private partnerships that are
designed to address climate change through
slowing the growth of greenhouse gas emissions.
One such partnership, which is one of a suite of
programs that addresses high global warming
potential (GWP) emissions, is the SFg Emission
Reduction Partnership for Electric Power
Systems. Sulfur hexafluoride (SFg) is a man made
gaseous fluorinated compound that has a long
atmospheric lifetime of 3,200 years. As compared
to carbon dioxide, SFg traps 23,900 times more
heat in Earth's atmosphere. For electric utilities in
the United States, participation in this program
signifies recognition of the opportunity they
have to reduce their carbon footprint through
cost-effective reductions in SFg gas emissions.
The electric utility industry uses SFg gas for high
voltage electrical insulation, current interruption,
and arc quenching in the transmission and
distribution of electricity. No clear alternative
exists for this gas that is used extensively in
circuit breakers, gas-insulated substations, and
switch gear, due to its inertness and dielectric
properties. In order to reduce emissions of this
potent greenhouse gas, Partners are identifying
sources of fugitive emissions from equipment
using different leak detection methods and
fixing these problems by repairing or replacing
the problem equipment. Additionally, Partners
are educating gas handlers and implementing
techniques to reduce emissions that occur during
installation, servicing, and disposal.
Inside the 2007 SFg Emissions Reduction Partnership Annual Report
> Partner Accomplishments 2007 2
> SFe Emissions Rate Trends 2
> Partnership Updates 5
> Upcoming Workshop NEW! 5
> Common Reporting Mistakes and Corrections NEW! 8
> Climate Change - Information and Resources NEW! 9
> Updated List of Partners 11
2007 Annual Report - December 2008
www.epa.gov/electricpower-sf6 1
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Partner Accomplishment
Since 1999, EPA's SFg Partners have made
significant reductions in emissions of SFg, and
in 2007, that trend continued. In this section,
the results of the 2007 reporting year, as well as
cumulative emission reductions for the program
in comparison to the 1999 baseline year, are
presented.
by 64 percent from the 1999 baseline emission
rate of 15.2 percent.
The aggregated program statistics for each
year since the 1999 Partnership launch are
summarized in Table 1. The results presented
in this report are based on a methodology to
Partner-Reported Emissions
The Partnership's annual average SFg emission
rate, the ratio of SFg emissions relative to total
nameplate capacity (i.e., the total quantity of SFg
contained in electrical equipment) has declined
significantly since 1999. As shown by the line
in Figure 1, the average 2007 SFg emission rate
is 5.5 percent, down from 6.5 percent in 2006.
Since the beginning of the Partnership in 1999
the Partnership's SFg emission rate has decreased
Figure 1: SF6 Emission Rate Trends
1999 2000 2001 2002 2003 2004 2005 2006 2007
total SF6 emissions total nameplate capacity
— SF6 emission rate
Estimation Methods
> Results in Table 1 are based on
Partners in the program in 2007 as
the representative population size
for estimates for the entire time-
series (1999-2007). To estimate
emissions and nameplate capacity
not reported by Partners, a set of
assumptions was developed. For
example, if a Partner provided
a report for 2005 and 2007 but
not for 2006, a 2006 estimate
was determined through linear
interpolation.2
1 Trends across years should be evaluated using the SFe
emission rate, rather than SFe emissions.
2 Reports published prior to 2007 did not follow the stated
new methodology.
2 www.epa.gov/electricpower-sf6
2007 Annual Report - December 2008
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address instances when reporting Partners have
not provided a complete data set, and to account
for the evolving size of the program.
Results for the 2007 reporting year include total
reported SFg emissions of 326,878 pounds, the
lowest estimated emissions for the program
overall to date, and a nameplate capacity of
5,899,489 pounds, the largest overall to date.
A summary of the total estimated SFg emission
reductions achieved by Partners through 2007
is presented in Table 2, which are derived by
evaluating emissions estimates (as shown in
Table 1). Emissions reductions are also presented
in terms of pounds and million metric tons of
carbon dioxide equivalent (MMTCOiE) with
the Partnership's inception year (1999) as the
baseline.
TABLE 1 Summary of Partnership SF6 Emissions, Nameplate Capacity, and Emission Rate
Total SF6
Emissions (Ibs)
Total SF6
Nameplate
Capacity (Ibs)
SF6 Emission
Rate3
1999
693,416
4,563,183
15.2%
2000
638,106
4,614,480
13.8%
2001
617,704
4,610,478
13.4%
2002
546,528
5,180,931
10.5%
2003
527,090
5,395,612
9.8%
2004
498,543
5,432,255
9.2%
2005
460,828
5,670,725
8.1%
2006
377,374
5,827,600
6.5%
2007
326,878
5,899,489
5.5%
a - Emission rate is defined as total emissions divided by total nameplate capacity (i.e., the total quantity of SF6 contained in electrical equipment).
TABLE 2 Summary of Partnership SF& Emissions and Reductions
Total Partner-
Reported SFe
Emissions (Ibs)
Total Partner-
Reported SFe
Emissions
(MMTC02e)
Reduction from
Baseline (Ibs)
Reduction
from Baseline
(MMTCO2e)
Percent Reduction
from Baseline
iggga
693,416
7.52
-
-
-
2000
638,106
6.92
55,370
0.60
8.0%
2001
617,704
6.70
75,772
0.82
70.9%
2002
546,528
5.92
746,889
7.59
27.2%
2003
527,090
5.71
766,326
7.80
24.0%
2004
498,543
5.40
794,873
2.77
28.7%
2005
460,828
4.99
232,589
2.52
33.5%
2006
377,374
4.09
376,042
3.43
45.6%
2007
326,878
3.54
366,538
3.97
53.0%
NOTE: Historical totals have been updated based on most recent data made available by Partners.
a - Baseline year.
2007 Annual Report - December 2008
www.epa.gov/electricpower-sf6 3
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To date, SFg Partners have achieved a
53 percent decrease in absolute emissions from
the 1999 baseline year. From 2006 to 2007,
Partners were able to reduce emissions of SFg
gas by 50,496 pounds, or the equivalent of
0.55 MMTCO2. Cumulatively, from 1999
through 2007, the emissions reductions total
1,554,278 pounds or 16.85 MMTCO2E (i.e., the
sum of "Reduction from Baseline" as provided
in row 3, Table 2).
Methods Partners Use to
Reduce Emissions of SFe Gas
las:
> Equipment leak detection
and repair
> Equipment upgrades and the
replacement of old with new
equipment
X Training employees in best
management practices to handle,
manage, and monitor
X Systematic operations tracking
including cylinder management
and SFe gas recycling cart use
Cumulative SFe emissions reductions of 1,554,278 pounds relative
to the 1999 baseline are equivalent to CO2 emissions reductions from:
X 3.1 million cars not driven for one year
X 39.1 million barrels of oil not used
X 4.4 million households reducing electricity use by 50 percent for one year
Source: http://www.epa.gov/cleanenergy/energy-resources/calculator.html
4 www.epa.gov/electricpower-sf6
2007 Annual Report - December 2008
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Partnership Update
In 2007 and 2008, the Partnership
has continued to grow and support
companies in their efforts to reduce SF6
emissions. Within the past year, two new
companies have joined the program's efforts to
help reduce SFg emissions from electric power
systems. These new Partners, in addition to
all other companies, are encouraged to set
reduction goals through 2012, which will help
the Partnership as a whole achieve its aggregate
reduction goal. A fundamental component to
emission reduction efforts is properly reporting
emissions, which gives a more accurate estimate
of achievements to date. To that end, a summary
of the common mistakes seen on reporting forms
and corrections to those mistakes is provided.
2009 Workshop on SFg Emission
Reduction Strategies
EPA will be hosting the Partnership's 2009
Workshop on SFg Emission Reduction Strategies
in Phoenix, Arizona on February 4-5, 2009 at
the Hyatt Regency Phoenix. EPA will celebrate
the program's 10 year anniversary at the
workshop with special recognition to Partners
that have contributed to the success of the
program throughout the decade. The workshop,
which will be held immediately following the
12th Annual EUEC 2009 Conference and
Expo will feature technical presentations on
best management practices, exhibitors that
provide a variety of services to electric utilities
on SFg management, training, and a site tour
of SFg Partner, Arizona Public Service. This
w,
brkshop Topics and Events
> SFe Emission Reduction Partnership
10 Year Anniversary - Program
Update and Partner Recognition
Ceremony
X Managing an SFe Gas Inventory:
Best Management Practices
X Personnel Training: SFe Gas
Handling
X SFe Leaks from Equipment:
Leak Detection, Repair, and
Replacement
X Training Course on SFe Emissions
Reductions through Recovery,
Recycling, and Reuse
X SFe Partner, Arizona Public Service,
Site Tour
event will serve as an excellent opportunity for
field personnel and environmental staff from
electric companies, including both Partners and
potential new Partners, to receive important
technical training and information that can
improve SFg gas handling and subsequent
2007 Annual Report - December 2008
www.epa.gov/electricpower-sf6 5
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emission reductions. For more information
on registration and the current agenda, please
visit the SFg Emission Reduction Partnership
for Electric Power System Web site at
www. epa. go v/electr icpower- sf 6.
New Partners and Upcoming
10 Year Anniversary
Since 2007, EPA has welcomed two new Partners
into the SFg Emission Reduction Partnership for
Electric Power Systems, New York State Electric
and Gas, a sister company to Partner, Rochester
Gas & Electric Corporation, and VT Transco
LLC. The Partnership began with 49 participants
in 1999 and has grown to a total of 78 Partners.
2009 will mark the Partnership's 10 year
anniversary. Our charter members are specially
recognized in the complete Partner list, which
can be referenced at the end of this report.
Program Goals
Newest Partners of the SF6 Emission
Reduction Partnership for Electric Power
Systems:
• New York State Electric and Gas -
Ithaca, NY
• VT Transco LLC - Rutland, VT
Setting an SFe Emission
Reduction Goal
Within 18 months of signing the
MOD, Partners agree to establish
an emission reduction goal. EPA
encourages Partners to evaluate their
goals annually and update them to
reflect ongoing performance. EPA
accepts any goals set by Partners.
Goals may include:
X A long-term target to reduce
absolute emissions or emission
rate by a certain year -
• Example: Reduce emissions (or emission
rate) by 50 percent by 2012.
X Annual or short-term rolling
targets -
• Example: Lowering the emission
rate from 6 to 5 percent by the next
reporting year.
> A stewardship goal -
• Example: Maintain low or zero
emissions.
Over the past two years, EPA has organized
an effort to establish a collective Partnership
goal by asking Partners to choose 2012 as a
target year for the goal they wish to establish.
In undertaking this effort, the intent is to
encourage companies to evaluate how their
company can meet the challenge to further
reduce SFg emissions by a target year common
to all Partners in the program. As illustrated in
Figure 2, more than 60 percent of companies
report emissions rates of 3.5 percent or less.
Figure 3 depicts a projected trajectory that SFg
emissions will take through 2012 to achieve a
Partnership established goal of a 3.5 percent
emission rate for the target year.
6 www.epa.gov/electricpower-sf6
2007 Annual Report - December 2008
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EPA encourages those that have not re-assessed
their goals to do so in light of their current
progress. Partners should also develop a long
term strategy for their use of SFg and consider
the procedures that can be put in place to bolster
mitigation efforts.
Revisiting the SFg Emission
Inventory Reporting Form
The Partnership's recommended method
for estimating SFg emissions is with the
SFg Emission Inventory Reporting Protocol
and Form. This form is based on the mass-
balance method, which works by tracking and
systematically accounting for all company uses
of SFg during the reporting year. The quantity
of SFg that cannot be accounted for is then
assumed to have been emitted to the atmosphere.
This method ensures that potential emissions
from both equipment losses and handling losses
are captured in the overall emission estimate.
Other methods, such as simply recording
amounts of SFg gas used to top off equipment
with low levels of the gas will not capture any
potential losses from SFg gas handling.
Figure 2: 2007 Emission Rates of Partners
100%
t 80%
c 60%
o
tt
(0
J= 40%
-5 20%
E
3
0%
5% 10% 15%
SF6 emission rate
20%
25%
30%
Figure 2 benchmarks the rates and range of emissions amongst Partner
companies. The purpose of the Partnership is to enable all participating
companies to improve management of their use of SF6 and reduce emissions
to cost-effective, technically feasible levels. Emission rates may differ due to a
number of variables including the total SF6 nameplate capacity of the system,
net transmission miles, age and geographic location of equipment, and
number of years participating in the Partnership, amongst other factors.
Figure 3: Partnership SFg Emission Rates,
Actual and Projected
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
^M projection based on historical trend
2007 Annual Report - December 2008
www.epa.gov/electricpower-sf6 7
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When EPA reviews Partner submittals, potential
mistakes are noted and EPA attempts to contact
Partners to better understand their inputs and
provide guidance on improving data collecting
and reporting. This year, EPA identified some
common confusion regarding two inputs
in the form: "SFg provided by equipment
manufacturers with or inside equipment" and
"total nameplate capacity of new equipment,"
as highlighted below. Partners are encouraged
to contact EPA's Program Manager with any
questions or concerns on the guidance provided
in the textbox below.
Common Mistakes on Reporting of SFe Purchases/Acquisitions
Mistake: Reporting that no SFg is provided by manufacturers with or inside equipment (Section B, number
4, "B4"), while simultaneously reporting a non-zero nameplate capacity for new equipment (Section D,
number 10, "DIG").
Clarification: High voltage equipment typically comes with as much as a 20% nominal charge of the total
nameplate capacity. When new nameplate capacity is reported (DIG), but SFg provided by manufacturers is
not reported (or reported as zero) (B4), emissions are incorrectly estimated.
Correction: Calculate B4 by assessing exactly how much SFg gas arrives with or alongside new equipment.
At a very minimum, EPA recommends developing a basic estimate of the typical nominal charge that is
associated with a new piece of equipment.
Purchase/
Acquisitions
ofSF6
Sales/
Disbursements
nf ^fr
Change in
Nameplate
Capacity
3. SF6 purchased from producers or
distributors in cylinders
4. SF6 provided by equipment
manufacturers with/inside equipment
5. SFg returned to the site after off-site
recycling
B. Total Purchase/Acquisitions (3+4+5)
6. Sales of SF6 to other entities, including
gas left in equipment that is sold
7. Returns of SF6 to supplier
8. SF6 sent to destruction facilities
9. SF6 sent off site for recycling
C. Total Sales/Disbursements (6-7-8-9)
10. Total nameplate capacity (proper full
charge) of new equipment
1 1 . Total nameplate capacity (proper full
charge) of retired or sold equipment
D. Change in Capacity (10-11)
Mistake: Reporting equivalent pounds for SFg provided
by manufacturers with or inside equipment (B4), and
nameplate capacity for new equipment (DIG).
Clarification: High voltage equipment typically comes
with as much as 20% nominal charge of the total
nameplate capacity, in addition to the bulk gas that
comes with the new equipment from manufacturers.
The bulk gas is usually provided in quantities which are
larger than the quantity required to fill the nameplate
capacity.
Correction: Calculate B4 by assessing exactly how
much gas arrives with or alongside the equipment. At
a very minimum, EPA recommends developing a basic
estimate of B4 that accounts for the quantity of SFg that
accompanies new equipment.
8 www.epa.gov/electricpower-sf6
2007 Annual Report - December 2008
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Climate Change —
*•* , / •• ••-"•
Information and Peso
Over the course of the past century,
humans have added substantial amounts of
greenhouse gases into the atmosphere, increasing
atmospheric concentrations. This increase alters
the balance of incoming and outgoing energy
into the Earth's atmosphere. The consequence
of this change in balance is climate change.
Climate change refers to any significant change
in measures of climate (such as temperature,
precipitation, or wind) lasting for an extended
period (decades or longer). The effects of these
changes are subject to on-going studies.
As with any field of scientific study, there
are uncertainties associated with the science
of climate change. However, much of what
scientists know is based on well-known
physical laws and documented historical trends
that substantiate many aspects of climate
science. Many communication channels exist
for scientists to share information and their
knowledge about the causes and possible effects
of climate change so people can fully understand
the phenomenon. Provided below are suggestions
sources to access information on climate change.
Intergovernmental Panel on
Climate Change
The Intergovernmental Panel on Climate Change
(IPCC) was established in 1988 by the World
Meteorological Organization (WMO) and the
United Nations Environmental Programme
(UNEP). The goal of the IPCC is to make
objective information about climate change
available to the policy and decision makers,
and the public. Available on the IPPC Web
site (http://www.ipcc.ch/index.htm) for public
viewing are Assessment Reports that provide the
most up-to-date information about the current
state of knowledge on climate change. A new
Assessment Report is published every four years.
In addition, the IPCC provides Special Reports
and Technical Reports addressing specialized
topics on climate change.
U.S. Environmental Protection
Agency
Through the United States Environmental
Protection Agency (EPA) Web site
(http://www.epa.gov/climatechange/) current
information about climate change is available.
Some of the topics covered include:
• Background • Science • Policy
• Health effects • Environmental effects
• U.S. regulatory initiatives
• The U.S. Greenhouse Gas Annual Inventory
• Emission reduction guidelines for homes,
schools, and businesses
• Voluntary emissions reduction programs
EPA continually updates their Web site in an
effort to make the most recent information
readily available. Additionally, EPA offers a
feature that provides access to a database of
frequently asked questions pertaining to climate
change (http://climatechange.custhelp.com/cgi-
bin/climatechange.cfg/php/enduser/std_alp.php).
If a question does not appear in the database,
2007 Annual Report - December 2008
www.epa.gov/electricpower-sf6 9
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site users can send questions through the Web to
EPA that will be directly answered and added to
the database.
United Nations Framework
Convention on Climate Change
In 1994, the United Nations Framework
Convention on Climate Change (UNFCCC) was
formed with the goal of sharing technology,
adaptation and policy information to support the
intergovernmental efforts to tackle the challenge
posed by climate change. The UNFCCC is
an international treaty, signed and ratified by
192 country members world wide, including
the United States. While the Kyoto Protocol
is an addition to the UNFCCC treaty, the
United States did not sign the Kyoto Protocol.
Nonetheless, as a party to the UNFCCC, the
United States complies with the commitment to
develop an annual inventory on greenhouse gas
emission and sinks.
Available on the UNFCCC Web site
(http://unfccc.int/2860.php) is information on
international emissions data, science and policy,
the Kyoto Protocol, and adaptation to effects
of climate change, amongst other related topics.
In addition, this information source provides
links to National Reports on greenhouse gas
emissions and details of national activity for all
192 member countries.
3 The most recent U.S. inventory is available at:
http://www.epa.gov/climatechange/emissions/index.html
Continued Growth A
In 2007, SFg Partners collectively reduced
the average SFg emission rate to 5.5 percent
compared to 6.5 percent in 2006 and
15.2 percent in 1999. SFg emissions in 2007 are
53 percent lower than in the 1999 baseline year.
Cumulatively, SFg Partners have prevented the
escape of approximately 1.6 million pounds of
SFg or 16.85 MMTCOie. Preventing the loss of
this much gas into the atmosphere translates into
an equivalent of $9.3 million to $14 million of
avoided SFg purchases to replace such losses.
4 Based on an SFe gas cost range of $6 to $9 per pound.
Estimated cost savings does not consider other potential cost
savings that might be realized indirectly, such as savings from
reduced labor and maintenance expenditure or potential
annual SF6 cylinder rental fees.
The demonstrated leadership of SFg Partners is
critical to the future success of the program. EPA
looks forward to celebrating the success of the
program with its Partners in 2009 and exploring
ways to further improve on current the strategies
to reduce emissions of this greenhouse gas from
electric power systems.
For additional information,
please contact:
Sally Rand
Program Manager
U.S. Environmental Protection Agency
Climate Change Division (6207J)
Washington, DC 20460
Tel: (202) 343-9739
E-mail: rand.sally@epa.gov
10 www.epa.gov/electricpower-sf6
2007 Annual Report - December 2008
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List of Partners (
* Charter Partner
Subsidiaries are indented under parent companies
Allegheny Power
Greensburg, PA
American Electric Power
(AEP)*
Columbus, OH
Arizona Public Service
Company (APS)
Phoenix, AZ
Athens Electric Department*
Athens, AL
Austin Energy
Austin, TX
Bangor Hydro-Electric
Company*
Bangor, ME
Big Rivers Electric
Corporation*
Henderson, KY
Bonneville Power
Administration *
Portland, OR
CenterPoint Energy*
Houston, TX
Central Maine Power
Company*
Augusta, ME
Central Vermont Public Service
Corporation*
Rutland, VT
City of Palo Alto
Palo Alto, CA
Columbia River People's Utility
District*
St. Helens, OR
Consolidated Edison Company
of New York, Inc.
New York, NY
CPS Energy (formerly San
Antonio City Public Service
Board)*
San Antonio, TX
Duquesne Light Company*
Pittsburg, PA
E.ON U.S. LCC
Louisville, KY
Edison International
Rosemead, CA
El Paso Electric Company*
El Paso, TX
Eugene Water and Electric
Board*
Eugene, OR
Exelon Energy Delivery (EED)
ComEd Energy Delivery*
Chicago, IL
PECO Energy Delivery
Philadelphia, PA
FirstEnergy Corporation*
Akron, OH
Florida Power and Light
Company (FPL)*
Juno Beach, FL
FPL Energy New England
Division
Seabrook, NH
Fort Pierce Utilities Authority*
Fort Pierce, FL
Grand Island Utilities
Department*
Grand Island, NE
Great River Energy
Elk River, MN
Hastings Utilities*
Hastings, NE
ITCTransmission
Novi, MI
Kings River Conservation
District*
Fresno, CA
Lower Colorado River
Authority (LCRA)
Austin, TX
Maine Public Service
Company*
Presque Isle, ME
Manitowoc Public Utilities*
Manitowoc, WI
Memphis Light, Gas 8c Water
Division
Memphis, TN
Menasha Utilities*
Menasha, WI
MidAmerican Energy
Des Moines, IA
Montana-Dakota Utilities
Bismarck, ND
Muscatine Power 8c Water*
Muscatine, IA
NSTAR Electric and Gas
Westwood, MA
2007 Annual Report - December 2008
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Boston Edison Company
Boston, MA
Cambridge Electric Light
Company
Boston, MA
Commonwealth Electric
Company
Boston, MA
Nashville Electric Service (NES)
Nashville, TN
National Grid
Granite State Electric
Northborough, MA
Massachusetts Electric
Northborough, MA
Nantucket Electric
Nantucket, MA
Narragansett Electric
Providence, RI
New England Power
Company
Westborough, MA
New England Electric
Transmission Corporation
Westborough, MA
New England Hydro-
Transmissions Company
Inc.
Westborough, MA
Niagara Mohawk Power
Corporation
Syracuse, NY
Nebraska Public Power District
Doniphan, NE
New York Power Authority
New York, NY
New York State Electric
and Gas
Ithaca, NY
Northeast Utilities Services
Company*
Connecticut Light and
Power Company
Berlin, CT
Public Service Company of
New Hampshire
Manchester, CT
Western Massachusetts
Electric Company
West Springfield, MA
Northern Indiana Public Service
Company (NIPSCO)
Merriville, IN
Oglethorpe Power
Tucker, GA
Oklahoma Gas and Electric
Corporation* (OG&E)
Oklahoma City, OK
Oncor (formerly TXU)*
Dallas, TX
Otter Tail Power Company
Fergus Falls, MN
PNM Resources
Alburuerque, NM
Pacificorp
Portland, OR
Pacific Power
Portland, OR
Rocky Mountain Power
Salt Lake City, UT
Pacific Gas and Electric
Corporation (PG&E)*
San Francisco, CA
Public Utility District No. 1 of
Douglas County
East Wenatchee, WA
Public Utility District No. 1 of
Pend Oreille County*
Newport, WA
Rochester Gas and Electric
Corporation
Rochester, NY
Seattle City Light
Seattle, WA
Silicon Valley Power*
Santa Clara, CA
South Carolina Electric 8c Gas
Company
Columbia, SC
Southern Company*
Atlanta, GA
Tennessee Valley Authority
(TVA)
Knoxville, TN
Texas Municipal Power
Agency*
Bryan, TX
VT Transco LLC
Rutland, VT
Wallingford Electric Division*
Wallmgford, CT
We Energies*
Milwaukee, WI
12 www.epa.gov/electricpower-sf6
2007 Annual Report - December 2008
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Distribution of Partners
MA
Rl
CT
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