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Illinois Natural Gas Underground Storage Capacity (Million Cubic Feet)
Illinois Natural Gas Underground Storage Capacity (Million Cubic Feet)
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  2002 898,565 898,565 898,565 898,565 898,565 898,565 898,565 898,565 898,565 898,565 898,565 898,565
  2003 898,565 898,565 898,565 898,565 898,565 901,274 901,274 901,274 945,307 945,307 945,307 945,307
  2004 959,244 959,244 959,244 959,244 959,112 959,112 959,112 959,112 959,112 972,388 972,388 972,388
  2005 972,388 972,388 972,388 972,388 972,388 972,388 972,388 972,388 972,388 972,388 972,388 972,388
  2006 972,388 972,388 972,388 972,388 972,388 972,388 972,388 972,388 972,388 981,995 981,995 981,995
  2007 981,995 981,995 981,995 981,995 981,995 981,995 981,995 981,995 984,768 984,768 984,768 984,768
  2008 984,491 984,491 984,491 984,491 984,491 984,491 984,491 984,491 984,491 984,491 980,414 980,414
  2009 980,414 980,414 980,414 980,414 980,414 939,776 980,414 980,414 980,414 980,414 980,414 989,454
  2010 989,454 989,454 989,454 989,454 989,454 989,454 989,454 989,454 989,454 989,454 989,454 989,454
  2011 904,075 904,075 904,075 904,075 904,075 904,075 904,075 904,075 904,075 904,075 904,075 904,075
  2012 997,355 997,355 997,355 997,885 997,355 997,355 997,355 997,355 997,355 997,355 997,355 999,931
  2013 999,931 999,931

- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
Release Date: 4/30/2013
Next Release Date: 5/31/2013

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