Exhibit 10.35
                  SATCON REGISTRATION RIGHTS AGREEMENT

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

"Advice" has meaning set forth in Section 3(m) hereof.

"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.

"Aggregate Price" has the meaning set forth in Section 2(d) hereof.

"AMEX" shall mean the American Stock Exchange.

"Business Day" means any day except Saturday, Sunday and any day which shall be
a legal holiday or a day on which banking institutions in the State of New York
generally are authorized or required by law or other government actions to
close.

"Commission" means the Securities and Exchange Commission.

"Common Stock" means the Company's Common Stock, par value $0.01 per share.

"Effectiveness Date" means the earlier of the 180th day following the (i)
Primary Closing Date (with respect to the Common Stock and Underlying
Securities issuable upon the exercise of the Warrants issued on the Primary
Closing Date), (ii) Secondary Closing Date (with respect to the Common Stock
and Underlying Securities issuable upon the exercise of the Warrant issued on
the Secondary Closing Date or (iii) the fifth day after the Company has
received notice (written or oral) from the Commission that the Commission Staff
will not be reviewing the applicable Registration Statement or has no further
comments on the applicable Registration Statement.

"Effectiveness Period" has the meaning set forth in Section 2(a) hereof.

"Exchange Act" means the Securities Exchange Act of 1934, as amended.

"Event" has the meaning set forth in Section 2(d) hereof.


"Filing Date" means as soon as practicable but in no event later than the 90th
day following the Primary Closing Date or the Secondary Closing Date, as
applicable.

"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 5(c) hereof.

"Indemnifying Party" has the meaning set forth in Section 5(c) hereof.

"Initial Registration Statement" has the meaning set forth in Section 2(a)
hereof.

"Losses" has the meaning set forth in Section 5(a) hereof.

"Nasdaq" shall mean the Nasdaq Stock Market.

"NYSE" shall mean the New York Stock Exchange.

"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.

"Primary Closing Date" shall mean the Primary Closing Date as defined in the
Purchase Agreement.

"Proceeding" means an action, claim, suit, investigation or proceeding
(including, without limitation, an investigation or partial proceeding, such as
a deposition), whether commenced or threatened.

"Prospectus" means the prospectus included in the Registration Statement
(including, without limitation, a prospectus that includes any information
previously omitted from a prospectus filed as part of an effective registration
statement in reliance upon Rule 430A promulgated under the Securities Act), as
amended or supplemented by any prospectus supplement, with respect to the terms
of the offering of any portion of the Registrable Securities covered by the
Registration Statement, and all other amendments and supplements to the
Prospectus, including post-effective amendments, and all material incorporated
by reference in such Prospectus.

"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 Sections 2(a) and 7(d),
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.

"Secondary Closing Date" shall have the meaning set forth in the Purchase
Agreement.

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

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

"Special Counsel" means one special counsel to the Holders, for which the
Holders will be reimbursed by the Company to the extent provided in Section 4.

"Trading Day" means a day on which the Nasdaq (or in the event the Common Stock
is not traded on Nasdaq, such other securities market on which the Common Stock
is listed) is open for trading.

"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 pursuant to the Purchase Agreement.

2.	Registration Requirements

(a)	Filing and Effectiveness Obligations. On or prior to the Filing Date
relating to each of the Primary Closing Date and the Secondary Closing Date, the
Company shall prepare and file with the Commission a Registration Statement (the
"Initial Registration Statement") which shall cover all Registrable Securities
issued to the Purchaser on such closing date for an offering to be made on a
continuous basis pursuant to a "Shelf" registration statement under Rule 415.
The Initial Registration Statement shall be on Form S-3 or any successor form
(except if the Company is not then eligible to register for resale the
Registrable Securities on Form S-3, in which case such registration shall be on
another appropriate form in accordance herewith, subject to the reasonable
consent of the original Holders of the Registrable Securities). The Company
shall (i) not permit any securities other than the Registrable Securities and
securities with respect to which there are outstanding demand or "piggy-back"
registration rights as of the date of filing of each Initial Registration
Statement to be included in the Initial Registration Statement and (ii) use
commercially reasonable efforts to cause the Initial Registration Statement to
be declared effective under the Securities Act as promptly as possible after the
filing thereof, and prior to the Effectiveness Date, and, except as provided
herein, to keep such Initial Registration Statement continuously effective under
the Securities Act until the date which is two years after the date that such
Initial Registration Statement is declared effective by the Commission or such
earlier date when all Registrable Securities covered by such Initial
Registration Statement have been sold or may be sold without volume restrictions

pursuant to Rule 144 as determined by counsel to the Company pursuant to a
written opinion letter, addressed to the Holders and the Company's transfer
agent to such effect (the "Effectiveness Period"). The number of shares of
Common Stock initially included in the Initial Registration Statement with
respect to each closing shall be the sum of the number of Securities and shares
of Common Stock that are then issuable upon the exercise of the Warrants which
were issued by the Company at such closing, without regard to any limitation on
the Investor's ability to exercise the Warrants. If at any time the number of
shares of Common Stock issuable pursuant to the Warrant is adjusted in
accordance with the terms thereof, and more shares are issuable pursuant to the
Warrants than remain available for sale pursuant to the Initial Registration
Statement, the Company shall immediately, but in no more than five (5) Business
Days, file a Registration Statement sufficient to register such additional
shares of Common Stock.

(b)	Form S-3 Eligibility. The Company represents and warrants that it
currently meets the registrant eligibility and transaction requirements for the
use of Form S-3 (for primary and secondary offerings) for the registration of
the sale of Registrable Securities by the Purchasers and any other Holders and
the Company shall file all reports required to be filed by the Company with the
Commission in a timely manner so as to maintain such eligibility for the use of
Form S-3.

	3.	Registration Procedures

In connection with the Company's registration obligations hereunder arising out
of the Primary Closing Date transactions and the Secondary Closing Date
transactions (but specifically excluding the Company's obligations under
Section 7(c) hereof which shall be governed by Section 7(c) of the Brown
Simpson Agreement, the Company shall:

(a)	Preparation of Registration Statement. Prepare and file with the
Commission on or prior to each Filing Date a Registration Statement on Form S-3
or its successor form (or if the Company is not then eligible to register for
resale the Registrable Securities on Form S-3 such registration shall be on
another appropriate form in accordance herewith (which shall include a Plan of
Distribution substantially in the form of Exhibit A annexed hereto.

(b)	Amendments. (i) Prepare and file with the Commission such amendments,
including post-effective amendments, to the Registration Statement as may be
necessary to keep the Registration Statement continuously effective for the
Effectiveness Period and prepare and file with the Commission such additional
Registration Statements in order to register for resale under the Securities
Act all of the Registrable Securities; (ii) cause the related Prospectus to be
amended or supplemented by any required Prospectus supplement, and as so
supplemented or amended to be filed pursuant to Rule 424 (or any similar
provisions then in force) promulgated under the Securities Act; (iii) respond
as promptly as possible to any comments received from the Commission with
respect to the Registration Statement or any amendment thereto and as promptly
as possible provide the Holders true and complete copies of all correspondence
from and to the Commission relating to the Registration Statement; and (iv)
comply in all material respects with the provisions of the Securities Act and
the Exchange Act with respect to the disposition of all Registrable Securities
covered by the Registration Statement during the applicable period in
accordance with the intended methods of disposition by the Holders thereof set
forth in the Registration Statement as so amended or in such Prospectus as so
supplemented.



(c)	Notifications. Notify the Holders of Registrable Securities to be sold,
as promptly as possible (and, in the case of (i)(A) below, not less than five
(5) days prior to such filing and, in the case of (i)(C) below, not later than
the first Business Day after effectiveness) and (if requested by any such
Person) confirm such notice in writing no later than one (1) Business Day
following the day (i)(A) when a Prospectus or any Prospectus supplement or
post- effective amendment to the Registration Statement is proposed to be
filed; (B) when the Commission notifies the Company whether there will be a
"review" of such Registration Statement and whenever the Commission comments in
writing on such Registration Statement and (C) with respect to the Registration
Statement or any post-effective amendment, when the same has become effective;
(ii) of any request by the Commission or any other Federal or state
governmental authority for amendments or supplements to the Registration
Statement or Prospectus or for additional information; (iii) of the issuance by
the Commission of any stop order suspending the effectiveness of the
Registration Statement covering any or all of the Registrable Securities or the
initiation of any Proceedings for that purpose; (iv) of the receipt by the
Company of any notification with respect to the suspension of the qualification
or exemption from qualification of any of the Registrable Securities for sale
in any jurisdiction, or the initiation or threatening of any Proceeding for
such purpose; and (vi) of the occurrence of any event that makes any statement
made in the Registration Statement or Prospectus or any document incorporated
or deemed to be incorporated therein by reference untrue in any material
respect or that requires any revisions to the Registration Statement,
Prospectus or other documents so that, in the case of the Registration
Statement or the Prospectus, as the case may be, it will not contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary to make the statements therein, in light of the
circumstances under which they were made, not misleading.

(d)	Suspensions. Use its reasonable efforts to avoid the issuance of, or,
if issued, obtain the withdrawal of (i) any order suspending the effectiveness
of the Registration Statement or (ii) any suspension of the qualification (or
exemption from qualification) of any of the Registrable Securities for sale in
any jurisdiction, at the earliest practicable moment.

(e)	Supplements and Post-Effective Amendments. If requested by any managing
underwriter or the Holders of a majority in interest of the Registrable
Securities to be sold in connection with an Underwritten Offering, (i) promptly
incorporate in a Prospectus supplement or post-effective amendment to the
Registration Statement such information as the Company reasonably agrees should
be included therein and (ii) make all required filings of such Prospectus
supplement or such post-effective amendment as soon as practicable after the
Company has received notification of the matters to be incorporated in such
Prospectus supplement or post-effective amendment; provided, however, that the
Company shall not be required to take any action pursuant to this Section 3(e)
that would, in the opinion of counsel for the Company, violate applicable law
or if the Holders of a majority of the Registrable Securities consent to the
delay in taking, or the failure to take, any such action, which consent shall
not be unreasonably withheld.

(f)	Copies of Registration Statement. Furnish to each Holder, without
charge, at least one conformed copy of each Registration Statement and each
amendment thereto, including financial statements and schedules, all documents
incorporated or deemed to be incorporated therein by reference, and all
exhibits to the extent requested by such Person (including those previously
furnished or incorporated by reference) promptly after the filing of such
documents with the Commission.


(g)	Copies of Prospectus. Promptly deliver to each Holder, without charge,
as many copies of the Prospectus or Prospectuses (including each form of
prospectus) and each amendment or supplement thereto as such Persons may
reasonably request; and the Company hereby consents to the use of such
Prospectus and each amendment or supplement thereto by each of the selling
Holders and any underwriters in connection with the offering and sale of the
Registrable Securities covered by such Prospectus and any amendment or
supplement thereto.

(h)	Blue Sky. Prior to any public offering of Registrable Securities, use
commercially reasonable efforts to register or qualify or cooperate with the
selling Holders, in connection with the registration or qualification (or
exemption from such registration or qualification) of such Registrable
Securities for offer and sale under the securities or Blue Sky laws of such
jurisdictions within the United States as any Holder or underwriter requests in
writing, to keep each such registration or qualification (or exemption
therefrom) effective during the Effectiveness Period and to do any and all
other acts or things necessary or advisable to enable the disposition in such
jurisdictions of the Registrable Securities covered by a Registration
Statement; provided, however, that the Company shall not be required to qualify
generally to do business in any jurisdiction where it is not then so qualified
or to take any action that would subject it to general service of process in
any such jurisdiction where it is not then so subject or subject the Company to
any material tax in any such jurisdiction where it is not then so subject.

(i)	Certificates. Cooperate with the Holder to facilitate the timely
preparation and delivery of certificates representing Registrable Securities to
be sold pursuant to a Registration Statement, which certificates shall be free,
to the extent permitted by applicable law and the Purchase Agreement, of all
restrictive legends, and to enable such Registrable Securities to be in such
denominations and registered in such names as any such managing underwriters or
Holders may request at least two (2) Business Days prior to any sale of
Registrable Securities.

(j)	Supplements and Amendments. Upon the occurrence of any event
contemplated by Section 3(c)(vi), as promptly as possible, prepare a supplement
or amendment, including a post-effective amendment, to the Registration
Statement or a supplement to the related Prospectus or any document
incorporated or deemed to be incorporated therein by reference, and file any
other required document so that, as thereafter delivered, neither the
Registration Statement nor such Prospectus will contain an untrue statement of
a material fact or omit to state a material fact required to be stated therein
or necessary to make the statements therein, in light of the circumstances
under which they were made, not misleading.

(k)	Listing. Cause all Registrable Securities relating to each Registration
Statement to be listed on Nasdaq and any other securities exchange, quotation
system, market or over-the-counter bulletin board, if any, on which similar
securities issued by the Company are then listed as and when required pursuant
to the Purchase Agreement.

(l)	Earnings Statement. Comply in all material respects with all applicable
rules and regulations of the Commission and make generally available to its
securityholders earning statements satisfying the provisions of Section 11(a)
of the Securities Act and Rule 158 not later than 45 days after the end of any
12-month period (or 90 days after the end of any 12- month period if such
period is a fiscal year), commencing on the first day of the first fiscal
quarter of the Company after the effective date of the Registration Statement,
which statement shall conform to the requirements of Rule 158.

(m)	Information. The Company may require each selling Holder to furnish to
the Company information regarding such Holder and the distribution of such
Registrable Securities as is required by law to be disclosed in the
Registration Statement, and the Company may exclude from such registration the
Registrable Securities of any such Holder who unreasonably fails to furnish
such information within a reasonable time after receiving such request.

The Company shall hold in confidence and not make any disclosure of information
concerning a Holder provided to the Company unless (i) disclosure of such
information, in the opinion of counsel to the Company, is required by law, (ii)
the disclosure of such information is necessary to avoid or correct a
misstatement or omission in any Registration Statement, (iii) disclosure of
such information is required by court or administrative order or is necessary
to respond to inquiries of regulatory authorities (provided, however, that the
Holder shall be given notice of any such pending disclosure so that the Holder
may seek a protective order), or (iv) such information has been made generally
available to the public other than by disclosure in violation of this or any
other agreement. The Company agrees that it shall, upon learning that
disclosure of such information concerning a Holder is sought in or by a court
or governmental body of competent jurisdiction or through other means, give
prompt notice to such Holder prior to making such disclosure, and allow the
Holder, at its expense, to undertake appropriate action to prevent disclosure
of, or to obtain a protective order for, such information.

If the Registration Statement refers to any Holder by name or otherwise as the
holder of any securities of the Company, then such Holder shall have the right
to require (if such reference to such Holder by name or otherwise is not
required by the Securities Act or any similar Federal statute then in force)
the deletion of the reference to such Holder in any amendment or supplement to
the Registration Statement filed or prepared subsequent to the time that such
reference ceases to be required.

Each Holder covenants and agrees that (i) it will not sell any Registrable
Securities under the Registration Statement until it has received copies of the
Prospectus as then amended or supplemented as contemplated in Section 3(g) and
notice from the Company that such Registration Statement and any post-effective
amendments thereto have become effective as contemplated by Section 3(c) and
(ii) it and its officers, directors or Affiliates, if any, will comply with the
prospectus delivery requirements of the Securities Act as applicable to them in
connection with sales of Registrable Securities pursuant to the Registration
Statement.

Each Holder agrees by its acquisition of such Registrable Securities that, upon
receipt of a notice from the Company of the occurrence of any event of the kind
described in Section 3(c)(ii), 3(c)(iii), 3(c)(iv), 3(c)(v) or 3(c)(vi), such
Holder will forthwith discontinue disposition of such Registrable Securities
under the Registration Statement until such Holder's receipt of the copies of
the supplemented Prospectus and/or amended Registration Statement contemplated
by Section 3(j), or until it is advised in writing (the "Advice") by the
Company that the use of the applicable Prospectus may be resumed, and, in
either case, has received copies of any additional or supplemental filings that
are incorporated or deemed to be incorporated by reference in such Prospectus
or Registration Statement. Notwithstanding anything to the contrary, the
Company shall cause its transfer agent to deliver unlegended shares of Common
Stock to a transferee of a Holder in accordance with the terms of the
Securities Purchase Agreement in connection with any sale of Registrable
Securities with respect to which an Holder has entered into a contract for sale
prior to the Holder's receipt of a notice from the Company of the happening of
any event of the kind described in Section 3(c)(ii), 3(c)(iii), 3(c)(iv),

3(c)(v) or 3(c)(vi) and for which the Holder has not yet settled.

(n)	Responses to the Commission. The Company agrees to respond fully and
completely to any and all comments on a Registration Statement received from
the Commission staff as promptly as possible but, for non-Underwritten
Offerings, in no event later than ten (10) Business Days of the receipt of such
comments, regardless of whether such comments are in oral or written form.

(o)	Confirmation of Effectiveness. Within two (2) Business Days after a
Registration Statement which covers applicable Registrable Securities is
ordered effective by the Commission, the Company shall deliver, and shall cause
legal counsel for the Company to deliver, to the transfer agent for such
Registrable Securities (with copies to the Holders whose Registrable Securities
are included in such Registration Statement) confirmation that such
Registration Statement has been declared effective by the Commission in the
form attached hereto as Exhibit B.

(p) Notwithstanding any other provision of this Section 3, the Company may
delay the filing or effectiveness of any Registration Statement or any
amendment or supplement thereto and suspend the right of the Holders to effect
sales of Registrable Securities thereunder for one or more periods (each a
"Suspension Period") of up to 60 calendar days in the aggregate per twelve (12)
month period in the event that such filing, effectiveness or sale would require
the Company to disclose any non-public information that the Company is not
otherwise required to disclose or to file any financial statements that the
Company is not otherwise required to file, provided however, that no Suspension
Period shall exceed 45 consecutive calendar days.

(q) Notwithstanding any other provision of this Section 3, the Holders shall
not be permitted to effect sales of the Registrable Securities under a
Registration Statement during a period in which the Company is engaged in the
process of registering under the Securities Act in an underwritten offering,
for as long as the underwriter reasonably considers is necessary.

	4.	Registration Expenses

All fees and expenses incident to the performance of or compliance with this
Agreement by the Company (other than Section 7(c) hereof which will be governed
by Section 7(c) of the Brown Simpson Agreement) shall be borne by the Company,
whether or not the Registration Statement is filed or becomes effective and
whether or not any Registrable Securities are sold pursuant to the Registration
Statement. The fees and expenses referred to in the foregoing sentence shall
include, without limitation, (i) all registration and filing fees (including,
without limitation, fees and expenses (A) with respect to filings required to
be made with Nasdaq and each other securities exchange or market on which
Registrable Securities are required hereunder to be listed and (B) in
compliance with state securities or Blue Sky laws (including, without
limitation, fees and disbursements of counsel for the Holders in connection
with Blue Sky qualifications as determined by a majority in interest of the
Holders), (ii) printing expenses (including, without limitation, expenses of
printing certificates for Registrable Securities and of printing prospectuses
if the printing of prospectuses is requested by the holders of a majority of
the Registrable Securities included in the Registration Statement), (iii)
messenger, telephone and delivery expenses, (iv) reasonable fees and
disbursements of counsel for the Company, (v) Securities Act liability
insurance, if the Company so desires such insurance, and (vi) fees and expenses
of all other Persons retained by the Company in connection with the
consummation of the transactions contemplated by this Agreement. In addition,
the Company shall be responsible for all of its internal expenses incurred in

connection with the consummation of the transactions contemplated by this
Agreement (including, without limitation, all salaries and expenses of its
officers and employees performing legal or accounting duties), the expense of
any annual audit, and the fees and expenses incurred in connection with the
listing of the Registrable Securities on any securities exchange as required
hereunder. The Company shall not be required to pay selling concessions,
discounts or other compensation paid to brokers, underwriters or other agents
in connection with the sale of any Registrable Securities, whether or not
incurred in an Underwritten Offering, or fees and expenses incurred by a Holder
that are not specified in this Section.

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), unless the failure to deliver such
final Prospectus (as amended or supplemented) was a result of noncompliance by
the Company with Section 3(g) of this Agreement. 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 5(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 5(a) or 5(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 5(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 5(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 5(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 Effectiveness Period, 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 Effectiveness Period, 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 6.

	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. Except as disclosed in Schedule 2.1(a) of the Purchase
Agreement, neither the Company nor any of its subsidiaries has previously
entered into any agreement granting any registration rights with respect to any
of its securities to any Person. This Agreement, together with the Purchase
Agreement and the MTI 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)	Piggy-Back 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-4 or Form S-8 (each as promulgated under the Securities
Act) or their then equivalents relating to equity securities to be issued
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 (and other than a registration statement filed pursuant to Section 2(b)
of the Registration Rights Agreement between the Company and Brown Simpson
Capital Management, LLC (and/or its affiliated fund), 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 Section 4 hereof), 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 7(c) 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 7(c) 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).
Notwithstanding the foregoing, the Company shall not file any registration

statement under the Securities Act (other than on Form S-4 or Form S-8)
relating to the offer and sale of any equity securities of the Company, or
offer or sell any equity securities of the Company in a transaction exempt from
registration pursuant to Regulation S under the Securities Act, until such time
as the Initial Registration Statement has been effective for a period of sixty
(60) Trading Days, which period shall be tolled if the effectiveness of the
Initial Registration Statement is suspended for any reason whatsoever.

(d)	Further Obligations of the Company. Whenever, under the preceding
sections of this Agreement, the Company is required hereunder to register
Registrable Securities pursuant to Section 7(c) above, it agrees that it shall
also do the following:

(1)	Unless and until the distribution of all Registrable Securities
requested to be registered under section 7(c) 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;

(2)	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;

(3) 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

(4) 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.

(e)	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.

(f)	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
Company 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 Purchaser 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.

(g)	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.

(h)	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.

(i)	Governing Law. The corporate laws of the State of Delaware 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.

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

(k)	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.

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

(m)	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.

(n)	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.


                         [SIGNATURE PAGE TO FOLLOW]









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

			SATCON TECHNOLOGY CORPORATION


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

                        MECHANICAL TECHNOLOGY INCORPORATED


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


                                       EXHIBIT A


                                  PLAN OF DISTRIBUTION


Our company is registering the shares of common stock on behalf of the selling
stockholders. All costs, expenses and fees in connection with the registration
of the shares offered by this prospectus will be borne by the Company, other
than brokerage commissions and similar selling expenses, if any, attributable
to the sale of shares which will be borne by the selling stockholders. Sales of
shares may be effected by selling stockholders from time to time in one or more
types of transactions (which may include block transactions) on the Nasdaq
National Market, in the over-the-counter market, in negotiated transactions,
through put or call options transactions relating to the shares, through short
sales of shares, or a combination of such methods of sale, at market prices
prevailing at the time of sale, or at negotiated prices. Such transactions may
or may not involve brokers or dealers. The selling stockholders have advised
our company that they have not entered into any agreements, understandings or
arrangements with any underwriters or broker-dealers regarding the sale of
their securities, nor is there an underwriter or coordinated broker acting in
connection with the proposed sale of shares by the selling stockholders.

The selling stockholders may enter into hedging transactions with
broker-dealers or other financial institutions. In connection with such
transactions, broker-dealers or other financial institutions may engage in
short sales of the shares or of securities convertible into or exchangeable for
the shares in the course of hedging positions they assume with selling
stockholders. The selling stockholders may also enter into options or other
transactions with broker-dealers or other financial institutions which require
the delivery to such broker-dealers or other financial institutions of shares
offered by this prospectus, which shares such broker-dealer or other financial
institution may resell pursuant to this prospectus (as amended or supplemented
to reflect such transaction).

The selling stockholders may make these transactions by selling shares directly
to purchasers or to or through broker-dealers, which may act as agents or
principals. Such broker- dealers may receive compensation in the form of
discounts, concessions or commissions from selling stockholders and/or the
purchasers of shares for whom such broker-dealers may act as agents or to whom


they sell as principal, or both (which compensation as to a particular broker-
dealer might be in excess of customary commissions).

The selling stockholders and any broker-dealers that act in connection with the
sale of shares are "underwriters" within the meaning of Section 2(11) of the
Securities Act, and any commissions received by such broker-dealers or any
profit on the resale of the shares sold by them while acting as principals
might be deemed to be underwriting discounts or commissions under the
Securities Act. The selling stockholders may agree to indemnify any agent,
dealer or broker-dealer that participates in transactions involving sales of
the shares against certain liabilities, including liabilities arising under the
Securities Act.

Because selling stockholders are "underwriters" within the meaning of Section
2(11) of the Securities Act, the selling stockholders will be subject to the
prospectus delivery requirements of the Securities Act. Our company has
informed the selling stockholders that the anti-manipulative provisions of
Regulation M promulgated under the Exchange Act may apply to their sales in the
market.

Selling stockholders also may resell all or a portion of the shares in open
market transactions in reliance upon Rule 144 under the Securities Act,
provided they meet the criteria and conform to the requirements of Rule 144.

Upon our company being notified by a selling stockholder that any material
arrangement has been entered into with a broker-dealer for the sale of shares
through a block trade, special offering, exchange distribution or secondary
distribution or a purchase by a broker or dealer, a supplement to this
prospectus will be filed, if required, pursuant to Rule 424(b) under the
Securities Act, disclosing:

- -	the name of each such selling stockholder and of the participating broker-
dealer(s);

- -	the number of shares involved;

- -	the initial price at which such shares were sold;

- -	the commissions paid or discounts or concessions allowed to such
broker- dealer(s), where applicable;

- -	that such broker-dealer(s) did not conduct any investigation to verify
the information set out or incorporated by reference in this prospectus; and

- -	other facts material to the transactions.

In addition, upon our company being notified by a selling stockholder that a
donee or pledgee intends to sell more than 500 shares, a supplement to this
prospectus will be filed.











                                  EXHIBIT B


                      FORM OF NOTICE OF EFFECTIVENESS
                         OF REGISTRATION STATEMENT


[TRANSFER AGENT]
Attn.:

		Re:	SatCon Technology Corporation

Ladies and Gentlemen:

We are counsel to SatCon Technology Corporation, a Delaware corporation (the
"Company"), and have represented the Company in connection with that certain
Securities Purchase Agreement (the "Purchase Agreement") entered into by and
among the Company and Mechanical Technology Incorporated (the "Holder")
pursuant to which the Company issued to the Holder its shares of the Company's
common stock, par value $0.01 per share (the "Common Stock"), and Warrants (the
"the Warrants") to acquire shares of Common Stock. Pursuant to the Purchase
Agreement, the Company also has entered into a Registration Rights Agreement
with the Holder (the "Registration Rights Agreement") pursuant to which the
Company agreed, among other things, to register the Registrable Securities (as
defined in the Registration Rights Agreement), including the shares of Common
Stock and shares of Common stock issuable upon exercise of the Warrants, under
the Securities Act of 1933, as amended (the "1933 Act"). In connection with the
Company's obligations under the Registration Rights Agreement, on
_______________, 1999, the Company filed a Registration Statement on Form S-3
(File No. 333-_____________) (the "Registration Statement") with the Securities
and Exchange Commission (the "SEC") relating to the Registrable Securities
which names each of the Holders as a selling stockholder thereunder.

In connection with the foregoing, we advise you that a member of the SEC's
staff has advised us by telephone that the SEC has entered an order declaring
the Registration Statement effective under the 1933 Act at [ENTER TIME OF
EFFECTIVENESS] on [ENTER DATE OF EFFECTIVENESS] and we have no knowledge, after
telephonic inquiry of a member of the SEC's staff, that any stop order
suspending its effectiveness has been issued or that any proceedings for that
purpose are pending before, or threatened by, the SEC and the Registrable
Securities are available for resale under the 1933 Act pursuant to the
Registration Statement.

							Very truly yours,
                                                        [ISSUER'S COUNSEL]

cc:	[LIST NAMES OF HOLDERS]