Lime Energy (LMEC) 10-K 2007 FY Annual report

Exhibit 32.1

CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

     In connection with the annual report of Lime Energy Co. (the “Company”) on Form 10-K for the period ended December 31, 2007, as filed with the Securities and Exchange Commission on the date hereof (the “Report”) to which this Certification is attached, I, David R. Asplund, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1.	The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
2.	The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: March 31, 2008

/s/ David R. Asplund

David R. Asplund

Chief Executive Officer

     A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to Lime Energy Co. and will be retained by Lime Energy Co. and furnished to the Securities and Exchange Commission or its staff upon request.