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Consumers Energy
Joined Natural Gas STAR in 1996
2018 Natural Gas STAR Summary Report
Segment: Transmission
Since the inception of the program in 1993, domestic
Natural Gas STAR partners have eliminated more
than 1,634,171,832 thousand cubic feet (Mcf) of
methane emissions.
359,571,981 Mcf of methane emissions have been
reduced in the Transmission Segment.
This report summarizes the voluntary methane
emissions reductions achieved by Consumers Energy
in the Transmission Segment under the EPA Natural
Gas STAR Program.
Reductions for Consumers Energy
2018	Cumulative
171,947 Mcf	2,747,002 Mcf
New: 165,044 Mcf
Ongoing: 6,903 Mcf
Methane Emission Reduction Equivalencies
See EPA's Greenhouse Gas Eauivalencies Calculator for additional eauivalencies and
details about the conversion units.
2018
(171,947 Mcf)
Cumulative
(2,747,002 Mcf)
Metric tons (MT) C02 equivalent
82,534 MTC02e
1,318,555 MTC02e
C02 emissions from the energy used by this many homes in one year
9,884 homes
157,911 homes
A't.
Vx"/ Carbon sequestered from this many acres of U.S. forests in one year
97,099 acres
1,551,242 acres
Value of methane saved (at $3 per Mcf)
$515,840
$8,241,005
* "New" reductions refer to reductions realized the first year an activity is implemented.
** "Ongoing" reductions come from activities that are eligible to accrue methane reductions after the first year the
activity is implemented. The length of time these activities can continue to accrue reductions or "sunset date" is
specified for each activity.
Consumers Energy
(Annual Reductions)
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Based on data available as of 11 /26/2019
Page 1 of 4

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Consumers Energy Methane Emission Reduction Technologies and Practices
201 8 Reductions in the Transmission Segment for Consumers Energy:
1 71,947 Mcf
Install automated air/fuel ratio \

controls: 4.0% \


Use pipeline pump-down

techniques to lower gas line

pressure: 96.0%
Cumulative Reductions in the Transmission Segment for Consumers
Energy: 2,747,002 Mcf
Use pipeline pump-down
techniques to lower gas line
pressure: 71.1%
Replace compressor rod packing
systems: 2.5%
DI&M at compressor stations: 7.0%
Reduce/downgrade system
pressure: 1 4.8%
"Cumulative reductions" are all reductions achieved by Consumers Energy in the Transmission Segment since joining
the program.
Based on data available as of 11 /26/2019
Page 2 of 4

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Summary of Technologies and Practices for the Transmission Segment

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Transmission Segment: Annual Reductions
(Cumulative Reductions: 359,571,981 Mcf)
New*
Ongoing*
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Total Annual Reductions in 201 8 for the Transmission Segment
(11,71 3,619 Mcf)
10.3%
3.9%
12.2%
~" 24.5%
1 7.5%
23.7%
Use of turbines at compressor stations (24.5%)
Inject blowdown gas into low pressure mains or fuel
gas system (23.7%)
Use composite wrap repair (1 7.5%)
Use pipeline pump-down techniques to lower gas
line pressure (1 2.2%)
Replace wet compressor seals with dry seals (8.9%)
Install electric compressors (2.9%)
Other (10.3%)
* "New" reductions refer to reductions realized the first year an activity is implemented.
** "Ongoing" reductions come from activities that are eligible to accrue methane reductions after the first year the
activity is implemented. The length of time these activities can continue to accrue reductions or "sunset date" is
specified for each activity.
Based on data available as of 11 /26/2019
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Top Technologies and Practices for the Transmission Segment
Top 10 Technologies and Practices in the Transmission Segment
Reported by Partners in the Last 5 Years (2014 to 2018)
Rank
Technology/Practice
Reductions (Mcf)
1
Use of turbines at compressor stations
14,533,973
2
Use pipeline pump-down techniques to lower gas line pressure
13,232,584
3
Use composite wrap repair
11,834,680
4
Inject blowdown gas into low pressure mains or fuel gas system
7,559,078
5
Replace wet compressor seals with dry seals
5,201,682
6
Install electric compressors
2,208,676
7
Use hot taps for in-service pipeline connections
1,316,474
8
DI&M at compressor stations
979,859
9
Use of YALE closures for ESD testing
702,895
10
Pipeline replacement and repair
665,886
Notes:
"Top technologies" are those that led to the greatest cumulative, partner-reported, methane reductions over the
specified time period.
Visit the Natural Gas STAR'S Recommended Technologies for more information.
Based on data available as of 11 /26/2019
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