EXHIBIT 21 State of Incorporation/Organization Subsidiaries of Indiana Energy, Inc., (Parent) - Indiana Gas Company, Inc. Indiana Richmond Gas Corporation, d/b/a Indiana Gas Company, Inc. Indiana Terre Haute Gas Corporation, d/b/a Indiana Gas Company, Inc. Indiana IEI Services, LLC Indiana IEI Capital Corp. Indiana IEI Investments, Inc. Indiana Energy Realty, Inc. Indiana IGC Energy, Inc. Indiana Indiana Energy Services, Inc. Indiana ProLiance Energy, LLC Indiana CIGMA, LLC Indiana Energy Systems Group, LLC Indiana Reliant Services, LLC Indiana Energy Financial Group, Inc. Indiana IEI Financial Services, LLC Indiana IEI Synfuels, Inc. Indiana