Mail Stop 6010 August 2, 2005 Mr. Michael EI-Hillow Chief Financial Officer Advanced Energy Industries, Inc 1625 Sharp Point Drive Fort Collins, CO 80525 	RE:	Advanced Energy Industries, Inc. 		Form 10-K for the year ended December 31, 2004 		Filed March 31, 2005 		Form 10-Q for the quarter ended March 31, 2005 File No. 000-26966 Dear Mr. EI-Hillow: 	We have completed our review of your Form 10-K and related filings and do not, at this time, have any further comments. 							Sincerely, 							Martin F. James 							Senior Assistant Chief Accountant