1 EXHIBIT 21 SUBSIDIARIES OF UNITED CITIES GAS COMPANY STATE OF NAME INCORPORATION PERCENT OF STOCK ---- ------------- ---------------- United Cities Gas Storage Company................................... Delaware 100% UCG Energy Corporation.............................................. Delaware 100% United Cities Propane Gas of Tennessee, Inc. (wholly- owned subsidiary of UCG Energy Corporation)....................... Tennessee 100% UCG Leasing, Inc. (wholly-owned subsidiary of UCG Energy Corporation)........................................ Georgia 100%