EXHIBIT 21

Subsidiaries of the Registrant

Set forth below is a listing, by name and jurisdiction of incorporation, of each corporation that is, as of the date of this report, a subsidiary of the Registrant. Unless otherwise indicated, each such corporation is a 100% owned subsidiary of the Registrant.

1) Compass Utility Supply, Inc., an Oregon corporation.

2) HHH, LLC, a Delaware limited liability company.

3) HSI Funding, LLC, a Delaware limited liability company.

4) HSI Holdings, Inc., a Delaware corporation.

5) HSI IP, Inc., a Delaware corporation.

6) Hughes Canada, Inc., a Delaware corporation.

7) Hughes Insurance Company, Ltd., a Bermuda company limited by shares.

8) Hughes Insurance Holdings, Inc., a Delaware corporation.

9) Hughes Supply IP, Inc., a Delaware corporation.

10) Hughes Supply Management Services, Inc., a Delaware corporation.

11) Hughes Supply Shared Services, Inc., a Delaware corporation.

12) Hughes Holdings, LLC, a Florida limited liability company.

13) Hughes Building Materials Holdings, LLC, a Florida limited liability company.

14) Hughes Electric Holdings, LLC, a Florida limited liability company.

15) Hughes MRO Holdings, LLC, a Florida limited liability company.

16) Hughes Plumbing Holdings, LLC, a Florida limited liability company.

17) Hughes Utilities Holdings, LLC, a Florida limited liability company.

18) Hughes Water & Sewer Holdings, LLC, a Florida limited liability company.

19) Hughes Building Materials, Ltd., a Florida limited partnership.

20) Hughes Electric, Ltd., a Florida limited partnership.

21) Hughes MRO, Ltd., a Florida limited partnership.

22) Hughes Plumbing, Ltd., a Florida limited partnership.

23) Hughes Utilities, Ltd., a Florida limited partnership.

24) Hughes Water & Sewer, Ltd., a Florida limited partnership.

25) Hughes Building Materials Group, Inc. (fka WCC Merger Corporation), a Georgia corporation.

26) Hughes MRO Group, Inc. (fka Century Maintenance Supply, Inc.), a Delaware corporation.

27) Hughes Plumbing Group, Inc. (fka Todd Pipe & Supply – Hawthorne, Inc.), a California corporation.

28) Hughes Utilities Group, Inc. (fka Utiliserve Holdings, Inc.), a Delaware corporation.

29) Hughes GP & Management, Inc. (fka Z&L Acquisition Corporation), a Delaware corporation.

30) Intra-Power, LLC, a California limited liability company, 49% owned.

31) Merex Corporation, a Texas corporation.

32) Merex De Mexico, Sociedad Anonima De Capital Variable, a Mexico corporation.

33) Merex Diesel Power, Sociedad Anonima De Capital Variable, a Mexico corporation.

34) Montana Electric Supply, Inc., a Montana corporation.

35) Montana Electric Supply, Inc., a Wyoming corporation.

36) Provalue, LLC, a Delaware limited liability company.

37) Southwest Power, Inc., a California corporation.

38) Southwest Stainless, L.P., a Delaware limited partnership.

39) SWS Acquisition LLC, a Delaware limited liability company.

40) SWS Funding LLC, a Delaware limited liability company.

41) Utility Products Supply Company, LLC, a Colorado limited liability company.

42) WES Acquisition Corporation, Inc., a Wyoming corporation.

43) Western States Electric, Inc., a Oregon corporation.

44) World-Wide Travel Network, Inc., a Florida corporation.