Exhibit 10.34

                     MTI REGISTRATION RIGHTS AGREEMENT


This MTI Registration Rights Agreement (this "Agreement") is made and entered
into as of October 21, 1999, between Mechanical Technology Incorporated, a New
York corporation (the "Company"), and SatCon Technology Corporation, a Delaware
corporation (the "Purchaser").

This Agreement is made pursuant to the Securities Purchase Agreement, dated as
of the date hereof among the Company and the Purchasers (the "Purchase
Agreement").

		The Company and the Purchasers hereby agree as follows:

	1.	Definitions

Capitalized terms used and not otherwise defined herein shall have the meanings
given such terms in the Purchase Agreement. As used in this Agreement, the
following terms shall have the following meanings:

"Affiliate" means, with respect to any Person, any other Person that directly
or indirectly controls or is controlled by or under common control with such
Person. For the purposes of this definition, "control," when used with respect
to any Person, means the possession, direct or indirect, of the power to direct
or cause the direction of the management and policies of such Person, whether
through the ownership of voting securities, by contract or otherwise; and the
terms "affiliated," controlling" and "controlled" have meanings correlative to
the foregoing.

"Commission" means the Securities and Exchange Commission.

"Common Stock" means the Company's Common Stock, par value $1.00 per share.

"Holder" or "Holders" means the holder or holders, as the case may be, from
time to time of Registrable Securities.

"Indemnified Party" has the meaning set forth in Section 4(c) hereof.

"Indemnifying Party" has the meaning set forth in Section 4(c) hereof.

"Person" means an individual or a corporation, partnership, trust, incorporated
or unincorporated association, joint venture, limited liability company, joint
stock company, government (or an agency or political subdivision thereof) or
other entity of any kind.

"Registrable Securities" means the shares of Common Stock issued or issuable
upon exercise of the Warrants, and any shares of the Company's capital stock
issued as a result of any stock split, stock dividend, recapitalization,
exchange or similar event; provided, that Registrable Securities shall not
include any such shares that are eligible for sale under Rule 144(k).

"Registration Statement" means the Initial Registration Statement and any
additional registration statements contemplated by Section 3, including (in
each case) the Prospectus, amendments and supplements to such registration
statement or Prospectus, including pre- and post-effective amendments, all
exhibits thereto, and all material incorporated by reference in such
registration statement.

"Rule 144" means Rule 144 promulgated by the Commission pursuant to the
Securities Act, as such Rule may be amended from time to time, or any similar
rule or regulation hereafter adopted by the Commission having substantially the
same effect as such Rule.

"Rule 158" means Rule 158 promulgated by the Commission pursuant to the
Securities Act, as such Rule may be amended from time to time, or any similar
rule or regulation hereafter adopted by the Commission having substantially the
same effect as such Rule.

"Rule 415" means Rule 415 promulgated by the Commission pursuant to the
Securities Act, as such Rule may be amended from time to time, or any similar
rule or regulation hereafter adopted by the Commission having substantially the
same effect as such Rule.

"Securities" means the Company's Common Stock issuable pursuant to the Purchase
Agreement.

"Securities Act" means the Securities Act of 1933, as amended.

"Underlying Shares" means the shares of Common Stock issuable upon exercise of
the Warrants.

"Underwritten Registration or Underwritten Offering" means a registration in
connection with which securities of the Company are sold to an underwriter for
reoffering to the public pursuant to an effective registration statement.

"Warrants" means the warrants issuable to the Purchaser pursuant to the
Purchase Agreement.

2. Piggyback Registrations. Except as provided herein if, at any time when
there is not an effective Registration Statement covering the Registrable
Securities, the Company shall determine to prepare and file with the Commission
a registration statement relating to an offering for its own account or the
account of others under the Securities Act of any of its equity securities,
other than on Form S-2 (but only in connection with a rights offering), S-4 or
Form S- 8 (each as promulgated under the Securities Act) or their then
equivalents relating to equity securities to be issued solely to existing
shareholders or solely in connection with any acquisition of any entity or
business or equity securities issuable in connection with stock option or other
employee benefit plans, the Company shall send to each Holder of Registrable
Securities written notice of such determination and, if within ten (10) days
after receipt of such notice, any such Holder shall so request in writing,
(which request shall specify the Registrable Securities intended to be disposed
of by the Purchasers), the Company will use reasonable efforts to effect the
registration under the Securities Act of all Registrable Securities which the
Company has been so requested to register by the Holder, to the extent
requisite to permit the disposition of the Registrable Securities so to be
registered, provided that if at any time after giving written notice of its
intention to register any securities and prior to the effective date of the
registration statement filed in connection with such registration, the Company
shall determine for any reason not to register or to delay registration of such
securities, the Company may, at its election, give written notice of such
determination to such Holder and, thereupon, (i) in the case of a determination
not to register, shall be relieved of its obligation to register any
Registrable Securities in connection with such registration (but not from its
obligation to pay expenses in accordance with this Agreement), and (ii) in the
case of a determination to delay registering, shall be permitted to delay
registering any Registrable Securities being registered pursuant to this

Section 2 for the same period as the delay in registering such other
securities. The Company shall include in such registration statement all or any
part of such Registrable Securities such Holder requests to be registered;
provided, however, that the Company shall not be required to register any
Registrable Securities pursuant to this Section 2 that are eligible for sale
pursuant to Rule 144(k) of the Securities Act. In the case of an underwritten
public offering, if the managing underwriter(s) or underwriter(s) should
reasonably object to the inclusion of the Registrable Securities in such
registration statement, then if the Company after consultation with the
Underwriter's representative should reasonably determine that the inclusion of
such Registrable Securities would materially adversely affect the offering
contemplated in such registration statement, and based on such determination
recommends inclusion in such registration statement of fewer Registrable
Securities then proposed to be sold by the Holders, then (x) the number of
Registrable Securities of the Holder and other holders of piggy-back
registration rights included in such registration statement shall be reduced
pro rata among such Holders and other holders of piggy-back registration rights
(based upon the number of Registrable Securities requested to be included in
the registration) or, in the case of other holders of piggy-back registration
rights, in the manner provided for in that applicable agreement, or (y) none of
the Registrable Securities of the Holders shall be included in such
registration statement if the Company, after consultation with the
underwriter(s), recommends the inclusion of none of such Registrable
Securities; provided, however, that if securities are being offered for the
account of other persons or entities as well as the Company, such reduction
shall not represent a greater fraction of the number of Registrable Securities
intended to be offered by the Holders than the fraction of similar reductions
imposed on such other persons or entities (other than the Company).

3.	Registration Expenses. In the event of a registration described in
Section 2, all reasonable expenses of registration and of the offering effected
thereby of any Holder of Registrable Securities participating in the offering,
including, without limitation, printing expenses, fees and disbursements of
counsel and independent public accountants, counsel to the holders fees and
expenses (including counsel fees incurred in connection with complying with
state securities or "blue sky" laws, fees of the National Association of
Securities Dealers, Inc. and fees of transfer agents and registrars), shall be
borne by the Company, except that each Holder of Registrable Securities shall
bear underwriting commissions, individual counsel fees, if any, and discounts
attributable to such Holder's Registrable Securities being registered.

4.	Further Obligations of the Company. Whenever, under the preceding
sections of this Agreement, the Company is required hereunder to register
Registrable Securities, it agrees that it shall also do the following:

(a)	Unless and until the distribution of all Registrable Securities
requested to be registered under section 2 above is complete, diligently
prepare for filing with the Commission a registration statement and such
amendments and supplements to said registration statement and the prospectus
used in connection therewith as may be necessary to keep said registration
statement effective for a period of at least 120 days and to comply with the
provisions of the Securities Act with respect to the sale of securities covered
by said registration statement for the period necessary to complete the
proposed public offering;

(b)	Furnish to any selling Holder of Registrable Securities such copies of
each preliminary and final prospectus and such other documents as such Holder
may reasonably request to facilitate the public offering of its Registrable
Securities;

(c) Enter into any underwriting agreement with provisions reasonably required
by the proposed underwriter for the selling Holder of Registrable Securities,
if any, and reasonably acceptable to the Company; and

(d) Register or qualify the Registrable Securities covered by said registration
statement under the securities or "blue-sky" laws of such jurisdictions as the
selling Holder of Registrable Securities may reasonably request.

5.	Indemnification

(a)	Indemnification by the Company. The Company shall, notwithstanding any
termination of this Agreement, indemnify and hold harmless each Holder, the
officers, directors, agents (including any underwriters retained by such Holder
in connection with the offer and sale of Registrable Securities), investment
advisors and employees of each of them, each Person who controls any such
Holder (within the meaning of Section 15 of the Securities Act or Section 20 of
the Exchange Act) and the officers, directors, agents and employees of each
such controlling Person, to the fullest extent permitted by applicable law,
from and against any and all joint or several losses, claims, damages,
liabilities, costs (including, without limitation, costs of preparation and
attorneys' fees) and expenses (collectively, together with actions, proceedings
or inquiries by any regulatory or self-regulatory organization, whether
commenced or threatened, "Losses"), as incurred, arising out of or relating to
(i) any untrue or alleged untrue statement of a material fact contained in the
Registration Statement, any Prospectus or any form of prospectus or in any
amendment or supplement thereto or in any preliminary Prospectus, or arising
out of or relating to any omission or alleged omission of a material fact
required to be stated therein or necessary to make the statements therein (in
the case of any Prospectus or form of prospectus or supplement thereto, in
light of the circumstances under which they were made) not misleading (in the
case of any Prospectus or form of prospectus or supplement thereto, in light of
the circumstances under which they were made), except to the extent, but only
to the extent, that such untrue statements or omissions are based upon and in
conformity with information regarding such Holder furnished in writing to the
Company by such Holder expressly for use therein, or (ii) any violation or
alleged violation by the Company of the Securities Act, the Exchange Act, any
other law, including, without limitation, any state securities law, or any rule
or regulation thereunder relating to the offer or sale of Registrable
Securities, provided, however, that the Company shall not be required to
indemnify any person with respect to a loss arising out of a sale of any
Registrable Securities during any period during which the Company has advised
the Holder to suspend sales pursuant to a registration statement. The Company
shall not, however, be liable for any Losses to any Holder with respect to any
untrue or alleged untrue statement of material fact or omission or alleged
omission of material fact if such statement or omission was made in a
preliminary Prospectus and such Holder did not receive a copy of the final
Prospectus (or any amendment or supplement thereto) at or prior to the
confirmation of the sale of the Registrable Securities in any case where such
delivery is required by the Securities Act and the untrue or alleged untrue
statement of material fact or omission or alleged omission of material fact
contained in such preliminary Prospectus was corrected in the final Prospectus
(or any amendment or supplement thereto) and such final prospectus was provided
by the Company to the Holder prior to the time of such sale. The Company shall
notify the Holders promptly of the institution, threat or assertion of any
Proceeding of which the Company is aware in connection with the transactions
contemplated by this Agreement.

(b)	Indemnification by Holder. The Holder shall indemnify and hold harmless
the Company, the directors, officers, agents and employees, each Person who

controls the Company (within the meaning of Section 15 of the Securities Act
and Section 20 of the Exchange Act), and the directors, officers, agents or
employees of such controlling Persons, to the fullest extent permitted by
applicable law, from and against all Losses, as incurred, arising solely out of
or based solely upon (i) any untrue statement of a material fact contained in
the Registration Statement, any Prospectus, or any form of prospectus, or
arising solely out of or based solely upon any omission of a material fact
required to be stated therein or necessary to make the statements therein not
misleading to the extent, but only to the extent, that such untrue statement or
omission is contained in any information so furnished in writing by such Holder
to the Company specifically for inclusion in the Registration Statement or such
Prospectus and that such information was reasonably relied upon by the Company
for use in the Registration Statement, such Prospectus or such form of
prospectus or to the extent that such information relates to such Holder or
such Holder's proposed method of distribution of Registrable Securities and was
reviewed and expressly approved in writing by such Holder expressly for use in
the Registration Statement, such Prospectus or such form of prospectus or (ii)
any violation or alleged violation by the Holders of the Securities Act, the
Exchange Act, any other law, including, without limitation, any state
securities law, or any rule or regulation thereunder relating to the offer or
sale of Registrable Securities; provided, however, that the indemnity agreement
contained in this Section 4(b) shall not apply to amounts paid in settlement of
any Losses if such settlement is effected without the prior written consent of
such Holder. In no event shall the liability of any selling Holder hereunder be
greater in amount than the dollar amount of the net proceeds received by such
Holder upon the sale of the Registrable Securities giving rise to such
indemnification obligation.

(c)	Conduct of Indemnification Proceedings. If any Proceeding shall be
brought or asserted against any Person entitled to indemnity hereunder (an
"Indemnified Party"), such Indemnified Party promptly shall notify the Person
from whom indemnity is sought (the "Indemnifying Party") in writing, and the
Indemnifying Party shall assume the defense thereof, including the employment
of counsel reasonably satisfactory to the Indemnified Party and the payment of
all fees and expenses incurred in connection with defense thereof; provided,
however, that the failure of any Indemnified Party to give such notice shall
not relieve the Indemnifying Party of its obligations or liabilities pursuant
to this Agreement, except (and only) to the extent that it shall be finally
determined by a court of competent jurisdiction (which determination is not
subject to appeal or further review) that such failure shall have proximately
and materially adversely prejudiced the Indemnifying Party.

An Indemnified Party shall have the right to employ separate counsel in any
such Proceeding and to participate in the defense thereof, but the fees and
expenses of such counsel shall be at the expense of such Indemnified Party or
Parties unless: (1) the Indemnifying Party has agreed in writing to pay such
fees and expenses; or (2) the Indemnifying Party shall have failed promptly to
assume the defense of such Proceeding and to employ counsel reasonably
satisfactory to such Indemnified Party in any such Proceeding; or (3) the named
parties to any such Proceeding (including any impleaded parties) include both
such Indemnified Party and the Indemnifying Party, and such Indemnified Party
shall have been advised by counsel that a conflict of interest is likely to
exist if the same counsel were to represent such Indemnified Party and the
Indemnifying Party (in which case, if such Indemnified Party notifies the
Indemnifying Party in writing that it elects to employ separate counsel at the
expense of the Indemnifying Party, the Indemnifying Party shall not have the
right to assume the defense thereof and such counsel shall be at the expense of
the Indemnifying Party). The Indemnifying Party shall not be liable for any
settlement of any such Proceeding effected without its written consent, which

consent shall not be unreasonably withheld. No Indemnifying Party shall,
without the prior written consent of the Indemnified Party, effect any
settlement of any pending Proceeding in respect of which any Indemnified Party
is a party, unless such settlement includes an unconditional release of such
Indemnified Party from all liability on claims that are the subject matter of
such Proceeding.

All fees and expenses of the Indemnified Party (including reasonable fees and
expenses to the extent incurred in connection with investigating or preparing
to defend such Proceeding in a manner not inconsistent with this Section) shall
be paid to the Indemnified Party, as incurred, within ten (10) Business Days of
written notice thereof to the Indemnifying Party (regardless of whether it is
ultimately determined that an Indemnified Party is not entitled to
indemnification hereunder; provided, that the Indemnifying Party may require
such Indemnified Party to undertake to reimburse all such fees and expenses to
the extent it is finally judicially determined that such Indemnified Party is
not entitled to indemnification hereunder).

(d)	Contribution. If a claim for indemnification under Section 4(a) or 4(b)
is unavailable to an Indemnified Party because of a failure or refusal of a
court of competent jurisdiction to enforce such indemnification in accordance
with its terms (by reason of public policy or otherwise), then each
Indemnifying Party, in lieu of indemnifying such Indemnified Party, shall
contribute to the amount paid or payable by such Indemnified Party as a result
of such Losses, in such proportion as is appropriate to reflect the relative
fault of the Indemnifying Party and Indemnified Party in connection with the
actions, statements or omissions that resulted in such Losses as well as any
other relevant equitable considerations. The relative fault of such
Indemnifying Party and Indemnified Party shall be determined by reference to,
among other things, whether any action in question, including any untrue or
alleged untrue statement of a material fact or omission or alleged omission of
a material fact, has been taken or made by, or relates to information supplied
by, such Indemnifying Party or Indemnified Party, and the parties' relative
intent, knowledge, access to information and opportunity to correct or prevent
such action, statement or omission. The amount paid or payable by a party as a
result of any Losses shall be deemed to include, subject to the limitations set
forth in Section 4(c), any reasonable attorneys' or other reasonable fees or
expenses incurred by such party in connection with any Proceeding to the extent
such party would have been indemnified for such fees or expenses if the
indemnification provided for in this Section was available to such party in
accordance with its terms. In no event shall any selling Holder be required to
contribute an amount under this Section 4(d) in excess of the net proceeds
received by such Holder upon sale of the Registrable Securities pursuant to the
Registration Statement giving rise to such contribution obligation.

The parties hereto agree that it would not be just and equitable if
contribution pursuant to this Section 4(d) were determined by pro rata
allocation or by any other method of allocation that does not take into account
the equitable considerations referred to in the immediately preceding
paragraph. No Person guilty of fraudulent misrepresentation (within the meaning
of Section 11(f) of the Securities Act) shall be entitled to contribution from
any Person who was not guilty of such fraudulent misrepresentation.

The indemnity and contribution agreements contained in this Section are in
addition to any liability that the Indemnifying Parties may have to the
Indemnified Parties.




6.      Rule 144.

During the period commencing on the date hereof and ending on the second
anniversary of the Secondary Closing (as defined in the Purchase Agreement), as
long as any Holder owns Registrable Securities, the Company covenants to timely
file (or obtain extensions in respect thereof and file within the applicable
grace period) all reports required to be filed by the Company after the date
hereof pursuant to Section 13(a) or l5(d) of the Exchange Act. During the
period commencing on the date hereof and ending on the second anniversary of
the Secondary Closing (as defined in the Purchase Agreement), as long as any
Holder owns Registrable Securities, if the Company is not required to file
reports pursuant to Section 13(a) or l5(d) of the Exchange Act, it will prepare
and furnish to the Holders and make publicly available in accordance with Rule
144(c) promulgated under the Securities Act annual and quarterly financial
statements, together with a discussion and analysis of such financial
statements in form and substance substantially similar to those that would
otherwise be required to be included in reports required by Section 13(a) or
15(d) of the Exchange Act, as well as any other information required thereby,
in the time period that such filings would have been required to have been made
under the Exchange Act. The Company further covenants that it will use
commercially reasonable efforts to take such further action as any Holder may
reasonably request, all to the extent required from time to time to enable such
Person to sell Underlying Shares without registration under the Securities Act
within the limitation of the exemptions provided by Rule 144 promulgated under
the Securities Act, including requesting of its counsel to provide any legal
opinions referred to in the Purchase Agreement. Upon the request of any Holder,
the Company shall deliver to such Holder a written certification of a duly
authorized officer as to whether it has complied with such requirements of this
Section 5.

	7.	Miscellaneous

(a)	Remedies. In the event of a breach by the Company or by a Holder of any
of their obligations under this Agreement, each Holder or the Company, as the
case may be, in addition to being entitled to exercise all rights granted by
law and under this Agreement, including recovery of damages, will be entitled
to specific performance of its rights under this Agreement. The Company and
each Holder agree that monetary damages would not provide adequate compensation
for any losses incurred by reason of a breach by it of any of the provisions of
this Agreement and hereby further agrees that, in the event of any action for
specific performance in respect of such breach, it shall waive the defense that
a remedy at law would be adequate.

(b)	No Inconsistent Agreements. Neither the Company nor any of its
subsidiaries has, as of the date hereof, nor shall the Company or any of its
subsidiaries, on or after the date of this Agreement, enter into any agreement
with respect to its securities that is inconsistent with the rights granted to
the Holder in this Agreement or otherwise conflicts with or limits the
provisions hereof. Neither the Company nor any of its subsidiaries currently
has in force or effect any agreement granting any registration rights with
respect to any of its securities to any Person. This Agreement, together with
the Purchase Agreement and SatCon Registration Rights Agreement, contain the
entire understanding of the parties with respect to the subject matter hereof
and supersede all prior agreements and understandings, oral or written, with
respect to such matters.

(c)	Amendments and Waivers. The provisions of this Agreement, including the
provisions of this sentence, may not be amended, modified or supplemented, and
waivers or consents to departures from the provisions hereof may not be given,

unless the same shall be in writing and signed by the Company and the Holders
of at least two-thirds of the then outstanding Registrable Securities;
provided, however, that for the purposes of this sentence, Registrable
Securities that are owned, directly or indirectly, by the Company, or an
Affiliate of the Company are not deemed outstanding. Notwithstanding the
foregoing, a waiver or consent to depart from the provisions hereof with
respect to a matter that relates exclusively to the rights of Holder and that
does not directly or indirectly affect the rights of other Holder may be given
by Holders of at least a majority of the Registrable Securities to which such
waiver or consent relates; provided, however, that the provisions of this
sentence may not be amended, modified, or supplemented except in accordance
with the provisions of the immediately preceding sentence.

(d)	Notices. Any notice or other communication required or permitted to be
given hereunder shall be in writing and shall be deemed to have been received
(a) upon hand delivery (receipt acknowledged) or delivery by telex (with
correct answer back received), telecopy or facsimile (with transmission
confirmation report) at the address or number designated below (if received by
5:00 p.m. eastern time where such notice is to be received), or the first
Business Day following such delivery (if received after 5:00 p.m. eastern time
where such notice is to be received) or (b) on the second Business Day
following the date of mailing by express courier service, fully prepaid,
addressed to such address, or upon actual receipt of such mailing, whichever
shall first occur. The addresses for such communications are (i) if to the
Purchaser to SatCon Technology Corporation, 161 First Street, Cambridge, MA
02142-1221, Attn: President and Chief Executive Officer, fax no. (617)
576-7455, with copies to Hale & Dorr LLP, 60 State Street, Boston, MA 02109,
Attn: Jeffrey N. Carp, Esq., fax no. (617) 526-5000 and (ii) if to Company to
Mechanical Technology Incorporated, 968 Albany-Shaker Road, Latham, New York
12110. Attention: Chief Financial Officer with copies to Catherine S. Hill,
PLLC, 4 Global View, Troy, New York 12180 Attn: Catherine S. Hill, Esq., fax
no. (518) 285- 7564 or such other address as may be designated in writing
hereafter, in the same manner, by such Person.

(e)	Successors and Assigns. This Agreement shall inure to the benefit of
and be binding upon the successors and permitted assigns of each of the parties
and shall inure to the benefit of the Holder. The Company may not assign its
rights or obligations hereunder without the prior written consent of the
Holder. The Holder may assign its rights hereunder in the manner and to the
Persons as permitted under the Purchase Agreement. In addition, the rights of
the Holder hereunder, including the right to have the Company register for
resale Registrable Securities in accordance with the terms of this Agreement,
shall be automatically assignable by the Holder if: (i) the Holder agrees in
writing with the transferee or assignee to assign such rights, and a copy of
such agreement is furnished to the Company within a reasonable time after such
assignment, (ii) the Company is, within a reasonable time after such transfer
or assignment, furnished with written notice of (a) the name and address of
such transferee or assignee, and (b) the securities with respect to which such
registration rights are being transferred or assigned, (iii) following such
transfer or assignment the further disposition of such securities by the
transferee or assignees is restricted under the Securities Act and applicable
state securities laws, (iv) at or before the time the Company receives the
written notice contemplated by clause (ii) of this Section, the transferee or
assignee agrees in writing with the Company to be bound by all of the
provisions of this Agreement, and (v) such transfer shall have been made in
accordance with the applicable requirements of the Purchase Agreement. The
rights to assignment shall apply to the Holders (and to subsequent) successors
and assigns.


(f)	Counterparts. This Agreement may be executed in any number of
counterparts, each of which when so executed shall be deemed to be an original
and all of which taken together shall constitute one and the same Agreement. In
the event that any signature is delivered by facsimile transmission, such
signature shall create a valid and binding obligation of the party executing
(or on whose behalf such signature is executed) the same with the same force
and effect as if such facsimile signature were the original thereof.

(g)	Governing Law. The corporate laws of the State of New York shall govern
all issues concerning the relative rights of the Company and the Purchaser as
its stockholders. All other questions concerning the construction, validity,
enforcement and interpretation of this Agreement shall be governed by and
construed in accordance with the laws of the State of New York, without regard
to principles of conflicts of law. Each party hereby irrevocably submits to the
non-exclusive jurisdiction of the federal courts sitting in the City of Albany,
County of Albany, or if diversity jurisdiction cannot be obtained, then in the
state courts sitting in the City of Albany, County of Albany, for the
adjudication of any dispute hereunder or in connection herewith or with any
transaction contemplated hereby or discussed herein, and hereby irrevocably
waives, and agrees not to assert in any suit, action or proceeding, any claim
that it is not personally subject to the jurisdiction of any such court, that
such suit, action or proceeding is improper. Each party hereby irrevocably
waives personal service of process and consent to process being served in any
such suit, action or proceeding by mailing a copy thereof to such party at the
address for such notices to it under this Agreement and agrees that such
service shall constitute good and sufficient service of process and notice
thereof. Nothing contained herein shall be deemed to limit in any way any right
to serve process in any manner permitted by law.

(h)	Cumulative Remedies. The remedies provided herein are cumulative and
not exclusive of any remedies provided by law.

(i)	Severability. If any term, provision, covenant or restriction of this
Agreement is held by a court of competent jurisdiction to be invalid, illegal,
void or unenforceable, the remainder of the terms, provisions, covenants and
restrictions set forth herein shall remain in full force and effect and shall
in no way be affected, impaired or invalidated, and the parties hereto shall
use their reasonable efforts to find and employ an alternative means to achieve
the same or substantially the same result as that contemplated by such term,
provision, covenant or restriction. It is hereby stipulated and declared to be
the intention of the parties that they would have executed the remaining terms,
provisions, covenants and restrictions without including any of such that may
be hereafter declared invalid, illegal, void or unenforceable.

(j)	Headings. The headings in this Agreement are for convenience of
reference only and shall not limit or otherwise affect the meaning hereof.

(k)	Shares Held by The Company and its Affiliates. Whenever the consent or
approval of Holders of a specified percentage of Registrable Securities is
required hereunder, Registrable Securities held by the Company or its
Affiliates (other than any Holder or transferees or successors or assigns
thereof if such Holder is deemed to be an Affiliate solely by reason of its
holdings of such Registrable Securities) shall not be counted in determining
whether such consent or approval was given by the Holders of such required
percentage.

(l)	Revision of SEC Position on Warrants. In the event the rules and
regulations of the Commission or the policies of the staff of the Commission
are modified and as a result thereof the Company determines in good faith that

it may be practicable and in the interests of the Company and the Holders to
register the exercise of the Warrants so that the Warrant Shares may be freely
resold without maintaining an effective registration statement under the
Securities Act for resales, the Company and the Holders agree to cooperate in
good faith to effect such amendments to this Agreement as may be appropriate to
provide that the Company may fulfill its obligations hereunder with respect to
the Warrants and the Warrant Shares by maintaining an effective registration
statement under the Securities Act covering the exercise of the Warrants rather
than the resale of the Warrant Shares.

IN WITNESS WHEREOF, the parties have executed this MTI Registration Rights
Agreement as of the date first written above.

			MECHANICAL TECHNOLOGY INCORPORATED


	                By:/s/Cynthia A. Scheuer
		        Name:Cynthia A. Scheuer
		       Title:Vice President/Chief  Financial Officer


                        SATCON TECHNOLOGY CORPORATION


	                By:/s/David B. Eisenhaure
                      Name:David B. Eisenhaure
                     Title:President/Chief Executive Officer