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% 58