UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                              FORM 12b-25 SEC File
                                Number: 000-50542
                            CUSIP Number: 448876 10 2

                           NOTIFICATION OF LATE FILING

(Check One):

|X| Form 10-KSB |_| Form 20-F |_| Form 11-K |_| Form 10-QSB |_| Form -SAR

  For Period Ended: December 31, 2006

  |_| Transition Report on Form 10-K
  |_| Transition Report on Form 20-F
  |_| Transition Report on Form 11-K
  |_| Transition Report on Form 10-Q
  |_| Transition Report on Form -SAR
  For the Transition Period Ended:____________

Nothing in this form shall be construed to imply that the Commission has
verified any information contained herein.

If the notification relates to a portion of the filing checked above, identify
the item(s) to which the notification relates:

PART I - REGISTRATION INFORMATION

Full Name of Registrant: Hydrogen Engine Center, Inc.

Former Name if Applicable: Green Mt.  Labs, Inc.

Address of Principal Executive Office (Street and Number) : 2502 East Poplar
Street

State and Zip Code: Algona, Iowa  50511

PART II - RULES 12b-25(b) AND (c)

If the subject report could not be filed without unreasonable effort or expense
and the registrant seeks relief pursuant to Rule 12b-25(b), the following should
be completed. (Check box if appropriate)




|X| (a) The reasons described in reasonable detail in Part III of this form
could not be eliminated without unreasonable effort or expense;

|X| (b) The subject annual report, semi-annual report, transition report on Form
10-K, Form 20-F, 11-K or Form N-SAR, or portion thereof, will be filed on or
before the fifteenth calendar following the prescribed due date; or the subject
quarterly report or transition report on Form 10-QSB, or portion thereof will be
filed on the or before the fifth calendar day following the prescribed due date:
and

    (c) The accountant's statement or other exhibit required by Rule 12b-25(c)
has been attached if applicable.

PART III - NARRATIVE

State below in reasonable detail the reasons why Forms 10-K, 20-F, 11- K, 10-Q,
N-SAR, or the transition report or portion thereof, could not be filed within
the prescribed time period.

Registrant has been unable to complete its Form 10-KSB for the year ended
December 31, 2006, within the prescribed time because of delays in completing
the financial statements and management's discussion and analysis that will be
part of the Form 10-KSB report. It is anticipated that the report will be filed
within the prescribed extension period.


PART IV - OTHER INFORMATION

(1) Name and telephone number of person to contact in regard to this
notification.

  Beverly Evans (515) 288- 2500
  ------------- ----- ------------------
 (Name)    (Area Code) (Telephone Number)

(2) Have all other periodic reports required under Section 13 or 15(d) of the
Securities Exchange Act of 1934 or Section 30 of the Investment Company Act of
1940 during the preceding 12 months or for such shorter period that the
registrant was required to file such report(s) been filed? If answer is no,
identify reports(s). Yes |X| No |_|

(3) Is it anticipated that any significant change in results of operations from
the corresponding period for the last fiscal year will be reflected by the
earnings statements to be included in the subject report or portion thereof?
Yes |_| No |X|

  If so, attach an explanation of the anticipated change, both narratively and
quantitatively, and, if appropriate, state the reasons why a reasonable estimate
of the results cannot be made.




                          HYDROGEN ENGINE CENTER, INC.
                  (Name of Registrant as Specified in Charter)

has caused this notification to be signed on its behalf by the undersigned
hereunto duly authorized.


Date:  April 2, 2007 By /S/ Sandra Batt
 -----------------------------------
  Sandra Batt, Chief Financial Officer

INSTRUCTION: The form may be signed by an executive officer of the registrant or
by any other duly authorized representative. The name and title of the person
signing the form shall be typed or printed beneath the signature. If the
statement is signed on behalf of the registrant by an authorized representative
(other than an executive officer), evidence of the representative's authority to
sign on behalf of the registrant shall be filed with the form.

  ATTENTION

Intentional misstatements or omissions of fact constitute Federal Criminal
Violations (See 18 U.S.C. 1001).