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Item 2. Properties.

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Item 2. Properties.

Distribution, transmission and related assets

At September 30, 2015, in our regulated distribution segment, we owned an aggregate of 70,218 miles of underground distribution and transmission mains throughout our distribution systems. These mains are located on easements or rights-of-way which generally provide for perpetual use. We maintain our mains through a program of continuous inspection and repair and believe that our system of mains is in good condition. Through our regulated pipeline segment we owned 5,477 miles of gas transmission and gathering lines as well as 111 miles of transmission and gathering lines through our nonregulated segment.

Storage Assets

We own underground gas storage facilities in several states to supplement the supply of natural gas in periods of peak demand. The following table summarizes certain information regarding our underground gas storage facilities at September 30, 2015:

StateUsable Capacity (Mcf)Cushion Gas (Mcf)(1)Total Capacity (Mcf)Maximum Daily Delivery Capability (Mcf)
Regulated Distribution Segment
Kentucky4,442,6966,322,28310,764,979105,100
Kansas3,239,0002,300,0005,539,00045,000
Mississippi1,907,5712,442,9174,350,48831,000
Total9,589,26711,065,20020,654,467181,100
Regulated Pipeline Segment — Texas46,083,54915,878,02561,961,5741,235,000
Nonregulated Segment
Kentucky3,438,9003,240,0006,678,90067,500
Louisiana438,583300,973739,55656,000
Total3,877,4833,540,9737,418,456123,500
Total59,550,29930,484,19890,034,4971,539,600
(1)Cushion gas represents the volume of gas that must be retained in a facility to maintain reservoir pressure.

Additionally, we contract for storage service in underground storage facilities on many of the interstate pipelines serving us to supplement our proprietary storage capacity. The following table summarizes our contracted storage capacity at September 30, 2015:

SegmentDivision/CompanyMaximum Storage Quantity (MMBtu)Maximum Daily Withdrawal Quantity (MDWQ)(1)
Regulated Distribution Segment
Colorado-Kansas Division4,761,909113,689
Kentucky/Mid-States Division11,181,603268,739
Louisiana Division2,595,619179,347
Mid-Tex Division3,250,000175,000
Mississippi Division3,554,535151,334
West Texas Division4,500,000146,000
Total29,843,6661,034,109
Nonregulated Segment
Atmos Energy Marketing, LLC8,026,869250,937
Trans Louisiana Gas Pipeline, Inc.1,674,00067,507
Total9,700,869318,444
Total Contracted Storage Capacity39,544,5351,352,553
(1)Maximum daily withdrawal quantity (MDWQ) amounts will fluctuate depending upon the season and the month. Unless otherwise noted, MDWQ amounts represent the MDWQ amounts as of November 1, which is the beginning of the winter heating season.

Offices

Our administrative offices and corporate headquarters are consolidated in a leased facility in Dallas, Texas. We also maintain field offices throughout our service territory, the majority of which are located in leased facilities. The headquarters for our nonregulated operations are in Houston, Texas, with offices in Houston and other locations, primarily in leased facilities.

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