Release Details

MIDLAND, Texas, May 5 /PRNewswire-FirstCall/ -- Natural Gas Services Group, Inc. (Amex: NGS), a leading provider of gas compression, flare equipment and services to the natural gas and oil industry, announces it plans to release its 2005 first quarter financial results on Thursday, May 12, 2005. In conjunction with the release, the Company has scheduled a conference call Thursday, May 12 at 3:15 PM Central Daylight Time.

     What: Natural Gas Services 2005 First Quarter Financial Results
           Conference Call

     When: Thursday, May 12, 2005 - 3:15 PM Central Daylight Time

     How:  Live via phone by dialing 800-936-4602. Code: Natural Gas Services.
           Participants to the conference call should call in at least
           5 minutes prior to the start time.

Steve Taylor, President and CEO of Natural Gas Services Group, Inc. will be leading the call and discussing first quarter financial results. Mr. Taylor and Wallace Sparkman, Chairman, will discuss the status of the industry and the role of the Company within the industry, the status of existing and new natural gas compressor leases, the integration of Screw Compression Systems, Inc. and an outlook on the 2005 fiscal year.

About Natural Gas Services Group, Inc

NGS manufactures, fabricates, sells, leases and services natural gas compressors that enhance the production of oil and gas wells. The Company also manufactures and sells flare systems and flare ignition systems for plant and production facilities.

For more information visit the Company's website at http://www.ngsgi.com .

Please contact Jim Drewitz, Creative Options Communications, 972-355-6070 with any questions regarding the conference call.

Certain statements contained herein are "forward looking" statements as such term is defined in the Private Securities Litigation Reform Act of 1995. Because statements include risks and uncertainties, actual results may differ materially from those expressed or implied and include, but are not limited to, those discussed in filings by the Company with the Securities and Exchange Commission.

     For More Information, Contact:
     Steve Taylor, President & CEO
     800-580-1828

     Jim Drewitz, Investor Relations
     972-355-6070

SOURCE  Natural Gas Services Group, Inc.
    -0-                             05/05/2005
    /CONTACT:  Steve Taylor, President & CEO of Natural Gas Services Group,
Inc., +1-800-580-1828; or Jim Drewitz, Investor Relations, +1-972-355-6070,
for Natural Gas Services Group, Inc./
    /Web site:  http://www.ngsgi.com /
    (NGS)

CO:  Natural Gas Services Group, Inc.
ST:  Texas
IN:  OIL
SU:  CCA MAV

AH-CT
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5143 05/05/2005 11:29 EDT http://www.prnewswire.com