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                                                                  EXHIBIT 10.101

                                 PROMISSORY NOTE

Amount:  $161,000.00                                    Date: July 30, 1993

     For value received, I, Joseph E. Cresci (the "Maker"), an employee of
Environmental Power Corporation, a Delaware corporation (the "Company"), hereby
promise to pay the Company ON DEMAND the principal amount of One Hundred
Sixty-One Thousand Dollars & 00/100 ($161,000.00) with interest (computed on the
basis of a 360 day year of twelve 30-day months) payable from the date hereof on
the unpaid balance of such principal amount, such interest to be payable
monthly.

     The interest payable on this Note shall track the Applicable Federal
"short-term monthly" Rate as defined in Section 1274(d) of the Internal Revenue
Code of 1954, as amended.

     As security for payments to be made by the Maker pursuant to this Note, the
Company shall retain custody of, and a security interest in, the certificate or
certificates representing 1,150,000 Shares of the Company's Common Stock, such
security interest to lapse at such time as all of the obligations of the Maker
under this Note have been satisfied in full or the Note has been canceled.

     The Company shall have full recourse against the Maker for collection and
payment of the debt evidenced by this Note and may seek personal judgment
against the Maker for payment of this Note.

     All or any part of the principal and accrued interest may be prepaid at
anytime without the payment of any penalty or premium.

     In case any payment herein provided shall not be paid when due, the Maker
further promises to pay all costs at collection, including all attorney's fees.

     This Note shall be governed by and construed in accordance with the laws of
the State of New Hampshire and shall have the effect of a sealed instrument.

     The Maker and all endorsers and guarantors of this Note hereby waive
presentment, demand, notice of nonpayment, protest and all other demands and
notices in connection with the delivery, acceptance, performance or enforcement
of the Note.

                                           Maker

                                           /s/ Joseph E. Cresci
                                           --------------------
                                           Joseph E. Cresci<PAGE>
                                                                  EXHIBIT 10.102

                                 PROMISSORY NOTE

Amount:   $161,000.00                                     Date: July 30, 1993

         For value received, I, Donald A. Livingston (the "Maker"), an employee
of Environmental Power Corporation, a Delaware corporation (the "Company"),
hereby promise to pay the Company ON DEMAND the principal amount of One Hundred
Sixty-One Thousand Dollars & 00/100 ($161,000.00) with interest (computed on the
basis of a 360 day year of twelve 30-day months) payable from the date hereof on
the unpaid balance of such principal amount, such interest to be payable
monthly.

         The interest payable on this Note shall track the Applicable Federal
"short-term monthly" Rate as defined in Section 1274(d) of the Internal Revenue
Code of 1954, as amended.

         As security for payments to be made by the Maker pursuant to this Note,
the Company shall retain custody of, and a security interest in, the certificate
or certificates representing 1,150,000 Shares of the Company's Common Stock,
such security interest to lapse at such time as all of the obligations of the
Maker under this Note have been satisfied in full or the Note has been canceled.

         The Company shall have full recourse against the Maker for collection
and payment of the debt evidenced by this Note and may seek personal judgment
against the Maker for payment of this Note.

         All or any part of the principal and accrued interest may be prepaid at
anytime without the payment of any penalty or premium.

         In case any payment herein provided shall not be paid when due, the
Maker further promises to pay all costs at collection, including all attorney's
fees.

         This Note shall be governed by and construed in accordance with the
laws of the State of New Hampshire and shall have the effect of a sealed
instrument.

         The Maker and all endorsers and guarantors of this Note hereby waive
presentment, demand, notice of nonpayment, protest and all other demands and
notices in connection with the delivery, acceptance, performance or enforcement
of the Note.

                                         Maker

                                         /s/ Donald A. Livingston
                                         -----------------------
                                         Donald A. Livingston<PAGE>
                                                                  EXHIBIT 10.103

                                 PROMISSORY NOTE

Amount:             $267,280.50                         Date:  December 15, 1995

     For value received, I, Donald A. Livingston (the "Maker"), an employee of
Environmental Power Corporation, a Delaware corporation (the "Company"), hereby
promise to pay the Company ON DEMAND the principal amount of Two Hundred
Sixty-Seven Thousand Two Hundred Eighty Dollars and 50/100 ($267,280.50) with
interest (computed on the basis of a 360 day year of twelve 30-day months)
payable from the date hereof on the unpaid balance of such principal amount,
such interest to be payable monthly.

     The interest payable on this Note shall track the Applicable Federal
"short-term monthly" Rate as defined in Section 1274(d) of the Internal Revenue
Code of 1954, as amended.

     As security for payments to be made by the Maker pursuant to this Note, the
Company shall retain custody of, and a security interest in, the certificate or
certificates representing 1,038,244 Shares of the Company's Common Stock, such
security interest to lapse at such time as all of the obligations of the Maker
under this Note have been satisfied in full or the Note has been canceled.

     The Company shall have full recourse against the Maker for collection and
payment of the debt evidenced by this Note and may seek personal judgment
against the Maker for payment of this Note.

     All or any part of the principal and accrued interest may be prepaid at
anytime without the payment of any penalty or premium.

     In case any payment herein provided shall not be paid when due, the Maker
further promises to pay all costs at collection, including all attorney's fees.

     This Note shall be governed by and construed in accordance with the laws of
the State of New Hampshire and shall have the effect of a sealed instrument.

     The Maker and all endorsers and guarantors of this Note hereby waive
presentment, demand, notice of nonpayment, protest and all other demands and
notices in connection with the delivery, acceptance, performance or enforcement
of the Note.

                                                       Maker

                                                      /s/ Donald A. Livingston
                                                      ------------------------
                                                      Donald A. Livingston<PAGE>
                                                                  EXHIBIT 10.104

                                 PROMISSORY NOTE

Amount:     $48,575.00                                  Date: September 9, 1997

         For value received, I, Robert I. Weisberg (the "Maker"), a Director of
Environmental Power Corporation, a Delaware corporation (the "Company"), hereby
promise to pay the Company ON DEMAND the principal amount of Forty-Eight
Thousand Five Hundred Seventy-Five Dollars & 00/100 ($48,575.00) with interest
(computed on the basis of a 360 day year of twelve 30-day months) payable from
the date hereof on the unpaid balance of such principal amount, such interest to
be payable monthly.

         The interest payable on this Note shall track the Applicable Federal
"short-term monthly" Rate as defined in Section 1274(d) of the Internal Revenue
Code of 1954, as amended.

         As security for payments to be made by the Maker pursuant to this Note,
the Company shall retain custody of, and a security interest in, the certificate
or certificates representing 80,000 Shares of the Company's Common Stock, such
security interest to lapse at such time as all of the obligations of the Maker
under this Note have been satisfied in full or the Note has been canceled.

         The Company shall have full recourse against the Maker for collection
and payment of the debt evidenced by this Note and may seek personal judgment
against the Maker for payment of this Note.

         All or any part of the principal and accrued interest may be prepaid at
anytime without the payment of any penalty or premium.

         In case any payment herein provided shall not be paid when due, the
Maker further promises to pay all costs at collection, including all attorney's
fees.

         This Note shall be governed by and construed in accordance with the
laws of the State of New Hampshire and shall have the effect of a sealed
instrument.

         The Maker and all endorsers and guarantors of this Note hereby waive
presentment, demand, notice of nonpayment, protest and all other demands and
notices in connection with the delivery, acceptance, performance or enforcement
of the Note.

                                      Maker

                                      /s/Robert I. Weisberg
                                      ---------------------
                                      Robert I. Weisberg<PAGE>
                                                                  EXHIBIT 10.105

                                 PROMISSORY NOTE

Amount:  $ 100,000.00                                Date:  April 12, 2001

     For value received, I, Joseph E. Cresci, (the "Maker") an employee of
Environmental Power Corporation, a Delaware corporation (the "Company"), hereby
promise to pay the Company ON DEMAND the principal amount of One Hundred
Thousand Dollars & 00/100 ($100,000.00) with interest (computed on the basis of
a 360 day year of twelve 30 day months) payable from the date hereof on the
unpaid balance of such principal amount, such interest to be payable monthly.

The interest payable on this Note shall track the Applicable Federal "short-term
monthly" Rate as defined in Section 1274(d) of the Internal Revenue Code of
1954, as amended.

As security for payments to be made by the Maker pursuant to this Note, the
Company shall retain custody of and a security interest in, the certificate or
certificates representing 1,150,000 Shares of the Company's Common Stock which
is being held for Promissory Note dated 7/30/93.

The Company shall have full recourse against the Maker for collection and
payment of the debt evidenced by this Note and may seek personal judgment
against the Maker for payment of this Note.

All or any part of the principal and accrued interest may be prepaid at anytime
without the payment of any penalty or premium.

In case any payment herein provided shall not be paid when due, the maker
further promises to pay all costs at collection, including all attorney's fees.

This Note shall be governed by and construed in accordance with the laws of the
State of New Hampshire and shall have the effect of a sealed instrument.

The Maker and all endorsers and guarantors of this Note hereby waive
presentment, demand, notice of nonpayment, protest and all other demands and
notices in connection with the delivery, acceptance, performance or enforcement
of the Note.

                                           Maker

                                           /s/ Joseph E. Cresci
                                           --------------------
                                           Joseph E. Cresci

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