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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                                   FORM 8-K/A
                                Amendment No. 1

                                 CURRENT REPORT

     PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934


         Date of Report (Date of earliest event reported): July 12, 2001





                          RELIABLE POWER SYSTEMS, INC.,
               Formerly known as Dencor Energy Cost Controls, Inc.
               (Exact name of registrant as specified in charter)







             COLORADO                     0-9255                84-0658020
  (State or other jurisdiction       (Commission File         (IRS Employer
of incorporation or organization)         Number)           Identification No.)








                            210 Fifth Street, Suite B
                           CASTLE ROCK, COLORADO 80104
               (Address of principal executive offices) (Zip Code)

       Registrant's telephone number, including area code: (720) 733-8970

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                                    FORM 8-K
                                 CURRENT REPORT
                         Pursuant to Section 13 or 15(d)
                          of the Securities Act of 1934

Item 1. Changes in Control of Registrant.

Not Applicable

Item 2. Acquisition or Disposition of Assets.

Not Applicable

Item 3. Bankruptcy or Receivership.

Not Applicable

Item 4. Changes in Registrant's Certifying Accountant.

Not Applicable

Item 5. Other Events

In April, 2001 we entered into an exclusive marketing and technology agreement
with an independent third party manufacturer of Seamless Power Machines. On July
12, 2001 we finalized this agreement by completing the specifications and
requirements for the Seamless Power Machine. Under this agreement, we acquired
the exclusive purchase and marketing rights to the Seamless Power Machine. The
agreement is for a minimum of 24 months, and can be extended by mutual agreement
by both parties to the agreement. We have agreed to purchase a minimum number of
65 units at set prices within the 24 months covered by the agreement. We also
have agreed to pay this independent third party manufacturer 50% of the defined
net profits for purchase orders and quotes fulfilled prior to this agreement and
40% of the defined net profits for purchase orders and quotes fulfilled
subsequent to this agreement referred to the Company by the independent third
party manufacturer. All sales originated by the Company under this agreement are
not subject to any sharing of net profits.

Item 6. Resignation of Registrant's Directors.

Not Applicable

Item 7. Financial Statements, Pro Forma Financial Information and Exhibits.

Exhibit 10.1 Exclusive marketing and technology agreement.*

Exhibit 99.1 Press Release of the Company Dated July 19, 2001*

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* Previously filed.


Item 8. Change in Fiscal Year.

Not Applicable

Item 9. Sales of Equity Securities Pursuant to Regulation S.

Not Applicable


                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


July 25, 2001                               /s/ Jerry A. Mitchell
                                            --------------------------
                                                    (Signature)

                                            Jerry A. Mitchell
                                            Vice President of Finance,
                                            Chief Financial Officer