September, 2006 Natural Gas Customer Choice Program Customer Enrollment Levels  (Updated Quarterly)               Residential Customer Enrollment               Customer Choice     Residential Customers    Residential

April, 2004 Natural Gas Customer Choice Program Customer Enrollment Levels Residential Customer Enrollment Customer Choice  Program Enrolled Residential Customers Percent Residential Enrolled Columbia Gas of Ohio 510,788 of 1,192,970 43%

December 2004 Natural Gas Customer Choice Program Customer Enrollment Levels Residential Customer Enrollment Customer Choice Program Enrolled Eligible

March 2005 Natural Gas Customer Choice Program Customer Enrollment Levels Residential Customer Enrollment Customer Choice Program Enrolled Eligible Percent Enrolled

Natural Gas Customer Choice Program Customer Enrollment Levels Archive files 2009 June 2009 March 2009   2008 December 2008   September 2008   June 2008   March 2008 2007 December 2007   September 2007   June 2007 March 2007 2006 December 2006 September 2006

December 2004 Natural Gas Customer Choice Program Customer Enrollment Levels Residential Customer Enrollment Customer Choice Program Enrolled Eligible Percent Enrolled Columbia Gas of Ohio 477,798 of

April, 2003 Natural Gas Customer Choice Program Customer Enrollment Levels Residential Customer Enrollment Customer Choice  Program Enrolled Residential Customers Percent Residential Enrolled Columbia Gas of Ohio 528,876 of 1,239,467 42.6%

July, 2004 Natural Gas Customer Choice Program Customer Enrollment Levels Residential Customer Enrollment Customer Choice  Program Enrolled Residential Customers Percent Residential Enrolled Columbia Gas of Ohio 484,682 of 1,237,629 39%