THERMO TERRATECH INC
8-K, 1999-10-21
TESTING LABORATORIES
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                 -------------------------------------------


                                    FORM 8-K


                                 CURRENT REPORT

                       Pursuant to Section 13 or 15(d) of
                       the Securities Exchange Act of 1934



                                 Date of Report
                      (Date of earliest event reported):

                                October 19, 1999

                   ----------------------------------------


                              THERMO TERRATECH INC.
             (Exact name of Registrant as specified in its charter)


Delaware                        1-9549                    04-2925807
(State or other               Commission             (I.R.S. Employer
jurisdiction of               File Number)        Identification Number)
incorporation or
organization)


85 First Avenue
Waltham, Massachusetts                                       02451
(Address of principal executive offices)                   (Zip Code)


                                (781) 370-1640
                         (Registrant's telephone number
                              including area code)



<PAGE>

      This Form 8-K contains forward-looking statements that involve a number of
risks and  uncertainties.  Important  factors that could cause actual results to
differ  materially from those indicated by such  forward-looking  statements are
set forth under the heading "Forward-looking Statements" in Exhibit 13 to Thermo
TerraTech  Inc.'s  Annual  Report on Form 10-K for the year ended April 3, 1999.
These  include  risks  and   uncertainties   relating  to:   dependence  of  the
Registrant's  businesses on environmental  regulation and on sales to government
entities;  potential environmental,  regulatory, and professional liability; the
availability of government funding; intense competition;  the effect of seasonal
influences  on  the  Registrant's  performance;  possible  obsolescence  of  the
Registrant's   services  due  to   technological   change;   dependence  on  the
availability of certain raw materials;  the Registrant's acquisition and spinout
strategies; development and commercialization of technology; the cash management
arrangement  with Thermo Electron  Corporation;  and the potential impact of the
year 2000 on processing date-sensitive information.

Item 5.     Other Events

     On October 20, 1999, the Registrant  issued a press release stating that it
has  entered  into a  definitive  agreement  and plan of merger  with its parent
corporation, Thermo Electron Corporation ("Thermo Electron"), under which Thermo
Electron would acquire all of the outstanding  common stock,  $.10 par value per
share (the "Common  Stock"),  held by the  shareholders of the Registrant  other
than Thermo Electron and its  affiliates.  The  Registrant's  board of directors
approved  the  merger  agreement  based  on  a  recommendation  of  its  special
committee, which was charged with representing the interests of the Registrant's
public shareholders.

     Under  the   agreement,   each  share  of  Common  Stock  owned  by  public
shareholders  would be exchanged for the  equivalent of at least $7.25 per share
of Common  Stock.  The actual number of Thermo  Electron  shares to be issued to
Thermo  TerraTech  public  shareholders  will be  determined  at the time of the
merger transaction, according to the conditions outlined below.

            (i) If during the 20 trading days immediately prior to the effective
date of the merger the average  closing price of Thermo Electron common stock is
less than $18.125,  Thermo TerraTech  shareholders would receive Thermo Electron
common stock worth the  equivalent of $7.25 per share of Common Stock.  However,
Thermo  Electron  may elect to  terminate  the merger  agreement  if it would be
required to issue 1.8 million or more shares of Thermo  Electron common stock in
the transaction.

            (ii) If the average closing price of Thermo Electron common stock is
between  $18.125 and $23.125,  each share of Common Stock would be exchanged for
 .4 shares of Thermo Electron common stock.
<PAGE>

            (iii) If the average  closing price of Thermo  Electron common stock
is greater than $23.125,  Thermo  TerraTech  shareholders  would receive  Thermo
Electron common stock worth the equivalent of $9.25 per share of Common Stock.

     Any shares of the common stock of Thermo  Electron would be offered only by
means of a prospectus.

     The Registrant  expects that the necessary  filings with the Securities and
Exchange  Commission (the "SEC") will be made shortly,  and that proxy materials
for a special meeting will be mailed to stockholders of the Registrant  promptly
after completion of SEC review. The completion of this transaction is subject to
certain customary  conditions,  including completion of review by the SEC of the
proxy  statement  regarding  the  proposed  transaction.  A copy  of the  merger
agreement  is  filed  as  an  exhibit  hereto.   Thermo  Electron,   which  owns
approximately  87% of the  Common  Stock,  intends  to vote all of its shares of
Common  Stock in favor of  approval  of the  merger  agreement  and,  therefore,
stockholder approval is assured. The transaction is expected to close during the
first calendar quarter of 2000. Following the merger, the shares of Common Stock
would cease to be publicly traded.

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

      (a)    Financial Statements of Business Acquired: not
            applicable.

      (b)   Pro Forma Financial Information: not applicable.

      (c)   Exhibits:

                   2.1 Agreement and Plan of Merger dated as of October 19, 1999
            by  and  among  Thermo   Electron   Corporation,   TTT   Acquisition
            Corporation and Thermo TerraTech Inc.


<PAGE>


                                    SIGNATURE



      Pursuant to the  requirements of the Securities  Exchange Act of 1934, the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned, thereunto duly authorized, on this 21st day of October, 1999.


                                   THERMO TERRATECH INC.


                                   By:  /s/ Theo Melas-Kyriazi
                                        -------------------------------------
                                        Theo Melas-Kyriazi
                                        Chief Financial Officer

<PAGE>


                                                                     Exhibit 2.1









                          AGREEMENT AND PLAN OF MERGER

                                  BY AND AMONG

                           THERMO ELECTRON CORPORATION

                           TTT ACQUISITION CORPORATION

                                       AND

                              THERMO TERRATECH INC.



                          DATED AS OF OCTOBER 19, 1999



<PAGE>


                                TABLE OF CONTENTS

                                                                            Page

ARTICLE I THE MERGER.........................................................2

1.1.  The Merger.............................................................2

1.2.  Effective Time; Closing................................................2

1.3.  Effect of the Merger...................................................2

1.4.  Certificate of Incorporation; Bylaws...................................3

1.5.  Directors and Officers.................................................3

1.6.  Effect on Capital Stock................................................3

1.7.  Surrender of Certificates..............................................5

1.8.  No Further Ownership Rights in TerraTech Common Stock..................6

1.9.  Lost, Stolen or Destroyed Certificates.................................6

1.10. Dividends..............................................................7

1.11. Fractional Shares......................................................7

1.12. Closing of Transfer Books..............................................7

1.13. Taking of Necessary Action; Further Action.............................7

1.14  Tax Treatment..........................................................8

ARTICLE II REPRESENTATIONS AND WARRANTIES OF TERRATECH.......................8

2.1.  Organization of TerraTech..............................................8

2.2.  TerraTech Capital Structure............................................8

2.3.  Authority..............................................................8

2.4.  Board Approval.........................................................9

2.5.  Fairness Opinion.......................................................9

2.6   Registration Statement; Proxy Statement/Prospectus.....................9

ARTICLE III REPRESENTATIONS AND WARRANTIES OF THERMO ELECTRON AND
      MERGER SUB............................................................10

3.1.  Organization..........................................................10

3.2.  Authority.............................................................10

3.3.  Capitalization........................................................11

3.4.  Reports and Financial Statements......................................12

3.5   Merger Sub............................................................13

                                      -i-
<PAGE>

3.6   Tax Treatment.........................................................13

3.7   Information Provided to Investment Bankers............................13

3.8   Litigation............................................................13

3.9   Compliance with Agreements............................................13

3.10  Registration Statement; Proxy Statement/Prospectus....................14

ARTICLE IV CONDUCT PRIOR TO THE EFFECTIVE TIME..............................14

4.1.  Conduct of Business by TerraTech......................................14

4.2   Conduct of Business by Thermo Electron................................14

ARTICLE V ADDITIONAL AGREEMENTS.............................................15

5.1.  Registration Statement; Other Filings.................................15

5.2.  Meeting of TerraTech Stockholders.....................................16

5.3.  Access to Information.................................................17

5.4.  Public Disclosure.....................................................17

5.5.  Legal Requirements....................................................17

5.6.  Notification of Certain Matters.......................................18

5.7.  Best Efforts and Further Assurances...................................18

5.8.  Stock Option and Employee Stock Purchase Plans; Reservation of
      Shares................................................................18

5.9.  Thermo Electron Form S-8..............................................19

5.10  Thermo Electron Form S-3..............................................19

5.11. Indemnification; Insurance............................................19

5.12. Deferred Compensation Plan............................................21

5.13. Compliance by Merger Sub..............................................21

5.14  Tax Treatment.........................................................22

5.15  NYSE Listing..........................................................22

ARTICLE VI CONDITIONS TO THE MERGER.........................................22

6.1.  Conditions to Obligations of Each Party to Effect the Merger..........22

6.2.  Additional Conditions to Obligations of TerraTech.....................23

6.3.  Additional Conditions to the Obligations of Thermo Electron and
      Merger Sub............................................................24

ARTICLE VII TERMINATION, AMENDMENT AND WAIVER...............................24

7.1.  Termination...........................................................24

7.2.  Notice of Termination; Effect of Termination..........................25

                                      -ii-
<PAGE>

7.3.  Fees and Expenses.....................................................26

7.4.  Amendment.............................................................26

7.5.  Extension; Waiver.....................................................26

ARTICLE VIII GENERAL PROVISIONS.............................................26

8.1.  Non-Survival of Representations and Warranties........................26

8.2.  Notices...............................................................26

8.3.  Counterparts..........................................................27

8.4.  Entire Agreement......................................................27

8.5.  Severability..........................................................28

8.6.  Other Remedies; Specific Performance..................................28

8.7.  Governing Law.........................................................28

8.8.  Assignment............................................................28

8.9   Headings..............................................................28

Exhibit A -  Form of Tax Opinion

                                     -iii-
<PAGE>


                          AGREEMENT AND PLAN OF MERGER


      This AGREEMENT AND PLAN OF MERGER (the "Agreement")  dated as of October
19, 1999 is by and among Thermo Electron  Corporation,  a Delaware corporation
("Thermo Electron"),  TTT Acquisition Corporation,  a Delaware corporation and
a  wholly-owned  subsidiary  of Thermo  Electron  ("Merger  Sub"),  and Thermo
TerraTech Inc., a Delaware corporation ("TerraTech").


                                    RECITALS

      A. Thermo Electron owns  approximately  87% of the  outstanding  shares of
common stock,  par value $.10 per share,  of TerraTech  (the  "TerraTech  Common
Stock"), and Thermo Electron desires to acquire all of the remaining outstanding
shares of TerraTech Common Stock.

      B.  Thermo  Electron  has formed the Merger Sub as a  subsidiary  with the
intent of causing it to merge with TerraTech, as described in this Agreement.

      C. Upon the terms and subject to the  conditions of this  Agreement and in
accordance  with the  Delaware  General  Corporation  Law (the  "DGCL"),  Thermo
Electron  and  TerraTech  will  enter into a  business  combination  transaction
pursuant to which Merger Sub will merge with and into TerraTech (the "Merger").

      D. The Board of Directors of Thermo  Electron (i) has determined  that the
Merger is consistent with and in furtherance of the long-term  business strategy
of Thermo  Electron,  and (ii) has approved this  Agreement,  the Merger and the
other transactions contemplated by this Agreement.

      E. The Board of Directors of TerraTech, on the recommendation of a special
committee of the Board of Directors (the "Special  Committee"),  consisting of a
director of TerraTech who is not an officer or director of Thermo Electron or an
officer of TerraTech,  (i) has  determined  that this  Agreement,  including the
Exchange Ratio (as defined  below),  and the  transactions  contemplated by this
Agreement,  are fair to,  and in the best  interests  of,  the  stockholders  of
TerraTech  (other than Thermo  Electron),  (ii) has  approved  and  declared the
advisability  of  this  Agreement,   the  Merger  and  the  other   transactions
contemplated  by this Agreement and (iii) has resolved to recommend the approval
and adoption of this Agreement by the stockholders of TerraTech.

      F. Adams, Harkness & Hill ("AH&H") has delivered to the Special Committee,
for its  consideration,  and for delivery to the stockholders of TerraTech,  its
written  opinion that,  subject to the various  assumptions  and limitations set
forth therein,  as of the date of such opinion the  consideration to be received
by the  stockholders of TerraTech  (other than Thermo  Electron) is fair to such
stockholders from a financial point of view.

      G. The parties  hereto  intend  that this  transaction  shall  qualify for
federal  income tax purposes as a  reorganization  within the meaning of Section
368(a) of the Internal Revenue Code of 1986, as amended (the "Code").


                                       1
<PAGE>

      H.  Thermo  Electron,  TerraTech  and Merger  Sub  desire to make  certain
representations  and  warranties  and other  agreements in  connection  with the
Merger.

      NOW,   THEREFORE,   in  consideration  of  the  covenants,   promises  and
representations set forth herein, and for other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged,  the parties agree
as follows:


                                    ARTICLE I
                                   THE MERGER

      1.1.  The Merger.  At the  Effective  Time (as defined in Section 1.2) and
subject  to and  upon  the  terms  and  conditions  of  this  Agreement  and the
applicable  provisions  of the DGCL,  Merger  Sub shall be merged  with and into
TerraTech,  the  separate  corporate  existence  of Merger  Sub shall  cease and
TerraTech  shall  continue  as  the  surviving  corporation.  TerraTech  as  the
surviving  corporation after the Merger is hereinafter  sometimes referred to as
the "Surviving Corporation."

      1.2. Effective Time; Closing. Subject to the provisions of this Agreement,
the Surviving  Corporation  shall cause the Merger to be consummated by filing a
Certificate of Merger (the  "Certificate of Merger") with the Secretary of State
of the State of Delaware in accordance with the relevant  provisions of the DGCL
(the time of such filing,  or such later time as may be agreed in writing by the
parties and specified in the Certificate of Merger,  being the "Effective  Time"
and the date on which the Effective Time occurs being the  "Effective  Date") as
soon as practicable on the Closing Date (as herein defined).  Unless the context
otherwise  requires,  the term "Agreement" as used herein refers collectively to
this  Agreement and the  Certificate  of Merger.  The closing of the Merger (the
"Closing")  shall take place at the  executive  offices of Thermo  Electron at a
time and date to be specified  by the parties,  which shall be no later than the
second business day after the satisfaction or waiver of the conditions set forth
in Article VI, or at such other time,  date and  location as the parties  hereto
agree in writing (the  "Closing  Date").  At the Closing,  (i)  TerraTech  shall
deliver to Thermo Electron the various  certificates  and  instruments  required
under Article VI, (ii) Thermo Electron and Merger Sub shall deliver to TerraTech
the various  certificates  and  instruments  required under Article VI and (iii)
TerraTech shall execute and file the Certificate of Merger with the Secretary of
State of the State of Delaware,  in accordance with the applicable provisions of
the DGCL.

      1.3. Effect of the Merger. At the Effective Time, the effect of the Merger
shall be as provided in this  Agreement  and the  applicable  provisions  of the
DGCL. Without limiting the generality of the foregoing,  and subject thereto, at
the Effective Time all the property, rights,  privileges,  powers and franchises
of TerraTech  and Merger Sub shall vest in the  Surviving  Corporation,  and all
debts,  liabilities  and duties of  TerraTech  and  Merger Sub shall  become the
debts, liabilities and duties of the Surviving Corporation.

                                       2
<PAGE>

      1.4.  Certificate of Incorporation; Bylaws.

            (a)  Subject to the  requirements  of Section  5.11  hereof,  at the
Effective  Time, the  Certificate of  Incorporation  of Merger Sub, as in effect
immediately   prior  to  the  Effective  Time,   shall  be  the  Certificate  of
Incorporation of the Surviving  Corporation until thereafter amended as provided
by law and such Certificate of Incorporation.

            (b) Subject to the  requirements of Section 5.11 hereof,  the Bylaws
of Merger Sub, as in effect  immediately  prior to the Effective Time, shall be,
at the Effective Time, the Bylaws of the Surviving  Corporation until thereafter
amended.

      1.5. Directors and Officers.  The directors of TerraTech immediately prior
to  the  Effective  Time  shall  be  the  initial  directors  of  the  Surviving
Corporation,  to serve until their  respective  successors  are duly  elected or
appointed  and  qualified.  The officers of TerraTech  immediately  prior to the
Effective  Time shall be the  officers of the  Surviving  Corporation,  to serve
until their successors are duly elected or appointed or qualified.

      1.6.  Effect on Capital  Stock.  At the  Effective  Time, by virtue of the
Merger  and  without  any  action on the part of Merger  Sub,  TerraTech  or the
holders of any of the following securities:

            (a) Exchange of TerraTech  Common  Stock.  Subject to the balance of
this Section 1.6,  each share of TerraTech  Common Stock issued and  outstanding
immediately prior to the Effective Time will be automatically converted into the
right to receive 0.4 share  (subject to  adjustment  pursuant to Section  1.6(g)
hereof,  the "Exchange  Ratio") of the common stock,  $1.00 par value, of Thermo
Electron (the "Thermo Common Stock").  As of the Effective Time, all such shares
of  TerraTech  Common  Stock  shall  no  longer  be  outstanding  and  shall  be
automatically  canceled and retired and shall cease to exist, and each holder of
a certificate representing any such shares of TerraTech Common Stock shall cease
to have any rights with respect thereto,  except the right to receive the Merger
Consideration  (as defined in Section  1.7(b)) upon surrender of the certificate
representing  such share of  TerraTech  Common  Stock in the manner  provided in
Section 1.7 (or in the case of a lost,  stolen or  destroyed  certificate,  upon
delivery of an  affidavit  (and bond,  if  required)  in the manner  provided in
Section 1.9).

            (b) Stock Options and Employee  Stock  Purchase Plan. All options to
purchase  TerraTech Common Stock outstanding  immediately prior to the Effective
Time under stock option plans  maintained  by TerraTech  (including  those plans
adopted when TerraTech was known as Thermo Process Systems Inc.),  consisting of
the Thermo Process Systems Inc.  Incentive Stock Option Plan, the Thermo Process
Systems Inc.  Nonqualified  Stock Option Plan, the Thermo  Process  Systems Inc.
Equity Incentive Plan and the Thermo Process Systems Inc. Directors Stock Option
Plan, each as amended (together,  the "TerraTech Stock Option Plans"),  shall be
converted  into  options to purchase  Thermo  Common  Stock in  accordance  with
Section 5.8 hereof.  All options to purchase  shares of  TerraTech  Common Stock
under the Amended and Restated Thermo  TerraTech  Employees' Stock Purchase Plan
(the "TerraTech ESPP") shall be converted into options to purchase Thermo Common
Stock in accordance with Section 5.8 hereof.

                                       3
<PAGE>

            (c)  Warrants.  All  warrants to  purchase  TerraTech  Common  Stock
outstanding  immediately  prior to the Effective  Time shall be converted at the
Effective  Time into warrants to purchase  Thermo  Common  Stock.  The number of
whole shares of Thermo  Common Stock for which each warrant will be  exercisable
(or will  become  exercisable  in  accordance  with its terms) and the per share
exercise  price for the shares of Thermo Common Stock  issuable upon exercise of
such TerraTech  warrant will be determined in accordance  with the terms of such
warrants.

            (d) Convertible  Debentures.  All TerraTech  convertible  debentures
(the  "Convertible  Debentures")  issued pursuant to the Fiscal Agency Agreement
dated as of May 2,  1996 by and  among  TerraTech,  Thermo  Electron  and  Chase
Manhattan  Bank  (formerly  Chemical  Bank) as Fiscal Agent (the "Fiscal  Agency
Agreement"),  outstanding  at the  Effective  Time shall remain the  Convertible
Debentures  of TerraTech,  provided  however,  that in lieu of TerraTech  Common
Stock being issuable upon conversion of such Convertible  Debentures,  after the
Effective  Time,  Thermo Common Stock shall be issuable upon  conversion of such
Convertible  Debentures  in  accordance  with  the  terms of the  Fiscal  Agency
Agreement.  At the Effective Time, the price at which the TerraTech  Convertible
Debentures then  outstanding  will be convertible into Thermo Common Stock shall
be adjusted in accordance with the terms of the Fiscal Agency Agreement.

            (e) Capital  Stock of Merger Sub.  Each share of common  stock,  par
value $.01 per share, of Merger Sub issued and outstanding  immediately prior to
the Effective Time shall be converted into and become one validly issued,  fully
paid and non-assessable  share of common stock, par value $.01 per share, of the
Surviving Corporation.

            (f) Treasury Stock;  Stock Held By Thermo Electron.  Notwithstanding
any other  provision of this  Agreement,  each share of  TerraTech  Common Stock
issued  and  outstanding  and  owned by  Thermo  Electron  or any  wholly  owned
subsidiary  of  Thermo  Electron,  together  with all  treasury  shares  held by
TerraTech immediately prior to the Effective Time shall cease to be outstanding,
and  shall  automatically  be  cancelled  and  retired  without  payment  of any
consideration therefor, cash or otherwise, and cease to exist.

            (g)  Adjustments  to Exchange  Ratio.  The  Exchange  Ratio shall be
adjusted to reflect  fully the effect of any stock split,  reverse  stock split,
stock dividend (including any dividend or distribution of securities convertible
into, or  exercisable  or  exchangeable  for,  TerraTech  Common Stock or Thermo
Common Stock, as the case may be), recapitalization or other like change without
receipt of  consideration  with respect to either the TerraTech  Common Stock or
the Thermo  Common Stock  occurring on or after the date hereof and prior to the
Effective  Time.  The  Exchange  Ratio  shall also be subject to  adjustment  as
follows:

                  (i) In the event the average of the  closing  prices per share
of Thermo  Common Stock as reported in the  consolidated  transaction  reporting
system for each of the 20  consecutive  trading days ending on the fifth trading
day prior to the Effective Time (the "Pre-Closing  Average Price") multiplied by
the Exchange Ratio is less than $7.25, then the Exchange Ratio shall be adjusted
to be equal to $7.25 divided by the  Pre-Closing  Average Price,  subject to the
provisions of Section 7.1(h).

                                       4
<PAGE>

                  (ii) In the event the Pre-Closing  Average Price multiplied by
the  Exchange  Ratio is greater  than $8.50,  then the  Exchange  Ratio shall be
adjusted to be equal to $8.50 divided by the Pre-Closing Average Price.

      1.7.  Surrender of Certificates.
            (a) Exchange  Agent.  Prior to the Effective  Time,  Thermo Electron
shall  authorize  Boston  EquiServe to act as the exchange  agent (the "Exchange
Agent") in the Merger. Immediately following the Effective Time, Thermo Electron
shall deposit with the Exchange Agent,  for the benefit of the holders of shares
of TerraTech  Common Stock,  for exchange in accordance  with the  provisions of
this  Article I,  certificates  representing  the shares of Thermo  Common Stock
issuable  pursuant to this  Agreement  in  exchange  for  outstanding  shares of
TerraTech  Common  Stock.  The Thermo Common Stock into which  TerraTech  Common
Stock shall be  converted  pursuant  to the Merger  shall be deemed to have been
issued at the Effective Time.

            (b) Exchange  Procedures.  As soon as practicable  after,  and in no
event more than three business days after,  the Effective Time,  Thermo Electron
shall  cause the  Exchange  Agent to mail to each  holder  of record  (as of the
Effective  Time)  of a  certificate  (a  "Certificate"  or  the  "Certificates")
representing  TerraTech  Common Stock (i) a letter of  transmittal  (which shall
specify  that  delivery  shall be  effected,  and risk of loss and  title to the
Certificates  shall pass, only upon delivery of the Certificates to the Exchange
Agent and shall  otherwise  be in such form and have such  other  provisions  as
Thermo  Electron may  reasonably  specify and as are  reasonably  acceptable  to
TerraTech, with the approval of the Special Committee) and (ii) instructions for
effecting the exchange of the Certificates for certificates  representing shares
of Thermo Common Stock, as provided herein.  Upon surrender of a Certificate for
cancellation  to the Exchange  Agent,  together with such letter of  transmittal
duly completed and validly executed in accordance with the instructions thereto,
the holder of such Certificate shall be entitled to receive in exchange therefor
(x) a  certificate  representing  shares of  Thermo  Common  Stock  equal to the
Exchange  Ratio  multiplied  by the number of shares of  TerraTech  Common Stock
represented by such Certificate  (rounded down to the nearest whole share),  (y)
any dividends or other  distributions to which such holder is entitled  pursuant
to Section 1.10 and (z) a check  issued  pursuant to Section 1.11 hereof for any
fractional share of Thermo Common Stock (the consideration  specified in clauses
(x),  (y)  and  (z)  being  collectively  referred  to  herein  as  the  "Merger
Consideration"),   and  the  Certificate  so  surrendered   shall  forthwith  be
cancelled. In the event of a transfer of ownership of shares of TerraTech Common
Stock which is not  registered  in the  transfer  records of TerraTech as of the
Effective  Time, the Merger  Consideration  may be paid in accordance  with this
Article I to a transferee if the Certificate evidencing such shares is presented
to the Exchange Agent,  accompanied by all documents required by law to evidence
and effect such transfer  pursuant to this Section.  Until so surrendered,  each
outstanding  Certificate  will be deemed from and after the Effective  Time, for
all corporate  purposes,  to evidence only the right to receive shares of Thermo
Common  Stock equal to the  Exchange  Ratio for each share of  TerraTech  Common
Stock represented on such Certificate, and the other Merger Consideration.

            (c) Transfers of Ownership.  If payment of the Exchange  Ratio is to
be made to any  person  other  than the  person  in whose  name the  Certificate
surrendered in exchange  therefor is registered,  it will be a condition of such


                                       5
<PAGE>

payment  that the  Certificate  so  surrendered  will be properly  endorsed  and
otherwise  in proper  form for  transfer  and that the  person  requesting  such
payment  will have paid to Thermo  Electron  or any agent  designated  by it any
transfer or other taxes required by reason of payment to a person other than the
registered  holder  of  the  Certificate  surrendered,  or  established  to  the
satisfaction of Thermo Electron or any agent  designated by it that such tax has
been paid or is not payable.

            (d) No Liability.  Notwithstanding  anything to the contrary in this
Section  1.7,  neither  the  Exchange  Agent,  Thermo  Electron,  the  Surviving
Corporation  nor any  party  hereto  shall be  liable  to a holder  of shares of
TerraTech  Common  Stock  for any  amount  properly  paid to a  public  official
pursuant to any applicable abandoned property, escheat or similar law.

            (e)  Responsibility;  Term.  During the term of its engagement,  the
Exchange Agent shall be responsible  for  delivering  certificates  representing
Thermo  Common  Stock and the  other  Merger  Consideration  to the  holders  of
properly endorsed Certificates that are returned to the Exchange Agent. Promptly
following  the date that is six months after the  Effective  Date,  the Exchange
Agent shall,  upon request by Thermo  Electron,  deliver to Thermo  Electron all
cash, Certificates,  certificates representing shares of Thermo Common Stock and
other documents in its possession relating to the transactions described in this
Agreement,  and the Exchange  Agent's duties shall terminate.  Thereafter,  each
holder of a Certificate  formerly  representing shares of TerraTech Common Stock
may surrender  such  Certificate  to Thermo  Electron and (subject to applicable
abandoned  property,  escheat and similar laws) receive in exchange therefor the
Merger  Consideration  represented  by such  Certificate,  without any  interest
thereon.

      1.8. No Further  Ownership  Rights in TerraTech  Common Stock.  The Thermo
Common Stock and cash,  if any,  delivered  to the holders of  TerraTech  Common
Stock upon the surrender of shares of TerraTech  Common Stock in accordance with
the terms hereof shall be deemed to have been delivered in full  satisfaction of
all rights pertaining to such shares of TerraTech Common Stock.

      1.9. Lost, Stolen or Destroyed Certificates. In the event any Certificates
shall have been lost, stolen or destroyed,  the Exchange Agent shall deliver the
certificates representing Thermo Common Stock and the other Merger Consideration
in respect of such lost, stolen or destroyed Certificates, upon the making of an
affidavit of that fact by the holder  thereof;  provided,  however,  that,  as a
condition  precedent to the payment thereof,  the owner of such lost,  stolen or
destroyed  Certificates  shall deliver a bond in such sum as Thermo  Electron or
the Exchange Agent may reasonably direct as indemnity against any claim that may
be made  against  Thermo  Electron  or the  Exchange  Agent with  respect to the
Certificates  alleged  to have been lost,  stolen or  destroyed,  unless  Thermo
Electron waives such requirement in writing.

      1.10.  Dividends.  No dividends or other distributions that are payable to
the  holders  of  record  of  Thermo  Common  Stock as of a date on or after the
Effective  Time shall be paid to the holders of TerraTech  Common Stock entitled
by reason of the Merger to  receive  Thermo  Common  Stock  until  such  holders
surrender  their  Certificates  in accordance  with Section 1.7(b) or provide an
affidavit and indemnity in accordance with Section 1.9. Upon such surrender, the
Exchange Agent or Thermo  Electron (in the event that the Exchange  Agent's term


                                       6
<PAGE>

has expired), shall pay or deliver to the persons in whose name the certificates
representing  such  Thermo  Common  Stock  are  issued  any  dividends  or other
distributions  that are payable to the holders of record of Thermo  Common Stock
as of a date on or after the  Effective  Time and which  were paid or  delivered
between the Effective Time and the time of such surrender; provided that no such
person  shall be  entitled to receive any  interest on such  dividends  or other
distributions.

      1.11. Fractional Shares. No certificates or scrip representing  fractional
shares of Thermo  Common  Stock shall be issued to holders of  TerraTech  Common
Stock upon the  surrender  for  exchange of  Certificates,  and such  holders of
TerraTech  Common  Stock shall not be entitled to any voting  rights,  rights to
receive any  dividends  or  distributions  or other rights as a  stockholder  of
Thermo  Electron  with respect to any  fractional  shares of Thermo Common Stock
that would  otherwise be issued to such holders of TerraTech  Common  Stock.  In
lieu of any  fractional  shares of Thermo  Common Stock that would  otherwise be
issued,  each holder of TerraTech  Common Stock that would have been entitled to
receive a fractional  share of Thermo Common Stock shall,  upon proper surrender
of such person's  Certificates,  receive a cash payment  (rounded to the nearest
cent) equal to the closing price per share of Thermo Common Stock as reported in
the  consolidated  transaction  reporting  system on the trading day immediately
preceding  the Closing  Date,  multiplied  by the  fraction of a share that such
holder of TerraTech Common Stock would otherwise be entitled to receive.

      1.12. Closing of Transfer Books. At the Effective Time, the stock transfer
books of  TerraTech  shall be closed and no transfer of  TerraTech  Common Stock
shall  thereafter  be made.  If,  after the  Effective  Time,  Certificates  are
presented  to Thermo  Electron,  they shall be canceled  and  exchanged  for the
Merger Consideration in accordance with Article I.

      1.13.  Taking of Necessary Action;  Further Action.  If, at any time after
the Effective  Time,  any further  action is necessary or desirable to carry out
the purposes of this Agreement and to vest the Surviving  Corporation  with full
right, title and possession to all assets, property, rights, privileges,  powers
and  franchises  of TerraTech  and Merger Sub, the officers and directors of the
Surviving  Corporation are fully  authorized in the name of TerraTech and Merger
Sub or otherwise to take, and will take,  all such lawful and necessary  action,
so long as such action is consistent with this Agreement.

      1.14 Tax  Treatment.  The  Merger is  intended  to  constitute  a tax-free
reorganization  under Section  368(a) of the Code. The parties hereby adopt this
Agreement as a "plan of reorganization"  within the meaning of Section 368(a) of
the Code and the regulations thereunder.


                                   ARTICLE II
                   REPRESENTATIONS AND WARRANTIES OF TERRATECH

      TerraTech  represents  and  warrants to Thermo  Electron and Merger Sub as
follows:

      2.1. Organization of TerraTech.  TerraTech and each of its subsidiaries is
a corporation or other legal entity duly organized, validly existing and in good
standing  under  the  laws  of  the   jurisdiction  of  its   incorporation   or
organization,  has the corporate or similar power to own,  lease and operate its


                                       7
<PAGE>

property and to carry on its business as now being  conducted and as proposed by
TerraTech  to be  conducted,  and is duly  qualified  to do business and in good
standing as a foreign  corporation or other legal entity in each jurisdiction in
which the failure to be so  qualified  would have a Material  Adverse  Effect on
TerraTech.  In this  Agreement,  the  term  "Material  Adverse  Effect"  used in
reference  to  TerraTech  means  any  event,  change  or  effect,  that is or is
reasonably  likely to be,  individually  or in the aggregate  with other events,
changes or  effects,  materially  adverse to the  financial  condition,  assets,
liabilities,   results  of   operations   or  business  of  TerraTech   and  its
subsidiaries, taken as a whole.

      2.2.  TerraTech  Capital  Structure.   The  authorized  capital  stock  of
TerraTech  consists of  75,000,000  shares of Common  Stock,  par value $.10 per
share,  of which  there were  19,072,133  shares  issued and  outstanding  as of
October 2, 1999,  and  511,640  shares in  treasury  as of October 2, 1999.  All
outstanding  shares  of  TerraTech  Common  Stock are duly  authorized,  validly
issued,  fully paid and  non-assessable and are not subject to preemptive rights
created by statute,  the Certificate of  Incorporation or Bylaws of TerraTech or
any agreement or document to which TerraTech is a party or by which it is bound.
As of October 2, 1999,  an  aggregate of  2,038,550  shares of TerraTech  Common
Stock,  net of exercises,  were reserved for issuance to employees,  consultants
and non-employee  directors  pursuant to the TerraTech Stock Option Plans, under
which options were  outstanding for an aggregate of 1,628,725  shares as of such
date. As of October 2, 1999, an aggregate of 700,500 shares of TerraTech  Common
Stock were  reserved for issuance upon the exercise of warrants and an aggregate
of 7,034,592  shares of TerraTech  Common Stock were  reserved for issuance upon
the conversion of the  Convertible  Debentures.  All shares of TerraTech  Common
Stock  subject  to  issuance  as  aforesaid,  upon  issuance  on the  terms  and
conditions  specified in the  instruments  pursuant to which they are  issuable,
would be duly authorized, validly issued, fully paid and non-assessable.

      2.3.  Authority.

            (a)  TerraTech has all  requisite  corporate  power and authority to
enter  into this  Agreement  and to  consummate  the  transactions  contemplated
hereby. The execution and delivery of this Agreement and the consummation of the
transactions  contemplated  hereby have been duly  authorized  by all  necessary
corporate action on the part of TerraTech,  subject only to the adoption of this
Agreement  by  TerraTech's  stockholders  and the  filing and  recording  of the
Certificate  of  Merger  pursuant  to the  DGCL.  Under  the  DGCL,  TerraTech's
stockholders  may adopt this  Agreement  by vote of the holders of a majority of
the outstanding  shares of TerraTech Common Stock.  This Agreement has been duly
executed  and  delivered  by  TerraTech,  and  assuming  the due  authorization,
execution and delivery by Thermo Electron and Merger Sub,  constitutes the valid
and binding  obligation of TerraTech,  enforceable in accordance with its terms.
The  execution  and  delivery of this  Agreement  by  TerraTech  do not, and the
performance  of this  Agreement  by TerraTech  will not,  (i)  conflict  with or
violate the Certificate of  Incorporation or Bylaws of TerraTech or (ii) subject
to  obtaining  the adoption by  TerraTech's  stockholders  of this  Agreement as
contemplated  in Section 5.2 and compliance with the  requirements  set forth in
Section 2.3(b) below, conflict with or violate any law, rule, regulation, order,
judgment or decree  applicable to TerraTech or any of its material  subsidiaries
or by which its or their respective properties is bound, except, with respect to
clause (ii), for any such conflicts,  violations,  defaults or other occurrences
that would not have a Material  Adverse  Effect on  TerraTech  or the  Surviving
Corporation.

                                       8
<PAGE>

            (b)  No   consent,   approval,   order  or   authorization   of,  or
registration,  declaration  or filing with any court,  administrative  agency or
commission  or  other   governmental   or   regulatory   body  or  authority  or
instrumentality  ("Governmental  Entity")  is  required  by or with  respect  to
TerraTech in connection with the execution and delivery of this Agreement or the
consummation of the transactions  contemplated hereby, except for (i) the filing
of the  Certificate of Merger with the Secretary of State of Delaware,  (ii) the
filing  by  TerraTech  and  Thermo  Electron  of the  Proxy  Statement  and  the
Registration Statement (as defined in Section 5.1), respectively,  with the U.S.
Securities and Exchange Commission ("SEC") in accordance with the Securities Act
of 1933, as amended (the  "Securities  Act") and the Securities  Exchange Act of
1934, as amended (the "Exchange Act") and (iii) such other consents,  approvals,
orders,  authorizations,  registrations,  declarations  and  filings  as  may be
required under applicable federal and state securities laws.

      2.4.  Board   Approval.   The  Board  of  Directors  of  TerraTech,   upon
recommendation  of the Special  Committee  that this  Agreement,  including  the
Exchange  Ratio,  is fair to, and in the best interests of, the  stockholders of
TerraTech (other than Thermo  Electron),  has, as of the date of this Agreement,
unanimously (i) adopted a resolution  approving this Agreement and declaring its
advisability,  (ii)  determined  that the  Merger  is fair  to,  and in the best
interests of, TerraTech and its stockholders,  and (iii) determined to recommend
that the stockholders of TerraTech approve this Agreement.

      2.5. Fairness Opinion.  The Special Committee has received an opinion from
AH&H dated  October  19, 1999 that,  as of such date,  the  consideration  to be
received by  TerraTech's  stockholders  in the Merger is fair,  from a financial
point of view, to TerraTech's stockholders other than Thermo Electron.

      2.6 Registration Statement;  Proxy  Statement/Prospectus.  The information
supplied by TerraTech for inclusion in the Registration Statement (including any
information  incorporated by reference in the Registration  Statement from other
filings made by TerraTech with the SEC) shall not, at the time the  Registration
Statement  becomes  effective  under the  Securities  Act,  contain  any  untrue
statement  of a material  fact or omit to state any material  fact  necessary in
order to make the statements  included  therein not misleading.  Other than with
respect to the  information  supplied by Thermo  Electron and/or Merger Sub, the
Proxy  Statement  shall not, on the date the Proxy  Statement is first mailed to
stockholders,  at the time of the TerraTech Stockholders' Meeting (as defined in
Section  5.1(b)) or at the  Effective  Time,  contain any untrue  statement of a
material fact or omit to state any material  fact required to be stated  therein
or  necessary  in  order  to  make  the  statements  therein,  in  light  of the
circumstances  under  which they are made,  not false or  misleading.  The Proxy
Statement will comply (other than with respect to information relating to Thermo
Electron  and/or  Merger  Sub) as to  form in all  material  respects  with  the
provisions of the Exchange Act and the rules and regulations thereunder.

                                       9
<PAGE>

                                   ARTICLE III
       REPRESENTATIONS AND WARRANTIES OF THERMO ELECTRON AND MERGER SUB

      Thermo  Electron  and Merger Sub,  jointly and  severally,  represent  and
warrant to TerraTech as follows:

      3.1.  Organization.  Thermo  Electron  is a  corporation  duly  organized,
validly  existing and in good  standing  under the laws of the State of Delaware
and Merger Sub is a corporation  duly  organized,  validly  existing and in good
standing under the laws of the State of Delaware,  each has the corporate  power
to own, lease and operate its property and to carry on its business as now being
conducted and as proposed to be conducted,  and is duly qualified to do business
and in good standing as a foreign  corporation in each jurisdiction in which the
failure  to be so  qualified  would  have a  Material  Adverse  Effect on Thermo
Electron.  In  this  Agreement,  the  term  "Material  Adverse  Effect"  used in
reference to Thermo  Electron means any event,  change or effect,  that is or is
reasonably  likely to be,  individually  or in the aggregate  with other events,
changes or  effects,  materially  adverse to the  financial  condition,  assets,
liabilities,  results of  operations  or  business  of Thermo  Electron  and its
subsidiaries, taken as a whole.

      3.2.  Authority.

            (a)  Each of  Thermo  Electron  and  Merger  Sub  has all  requisite
corporate power and authority to enter into this Agreement and to consummate the
transactions  contemplated  hereby. The execution and delivery of this Agreement
and the  consummation  of the  transactions  contemplated  hereby have been duly
authorized by all necessary  corporate action on the part of Thermo Electron and
Merger Sub,  subject  only to the filing and  recording  of the  Certificate  of
Merger pursuant to the DGCL. This Agreement has been duly executed and delivered
by each of Thermo Electron and Merger Sub and,  assuming the due  authorization,
execution  and  delivery  of  this   Agreement  by  TerraTech,   this  Agreement
constitutes  the valid and binding  obligation  of each of Thermo  Electron  and
Merger Sub, enforceable in accordance with its terms. The execution and delivery
of this  Agreement  by each of Thermo  Electron  and Merger Sub do not,  and the
performance  of this  Agreement  by each of Thermo  Electron and Merger Sub will
not, (i) conflict with or violate the Certificate of  Incorporation or Bylaws of
Thermo Electron or the Certificate of  Incorporation  or Bylaws of Merger Sub or
of any material  subsidiary,  direct or indirect,  of Thermo  Electron  (each, a
"Material Thermo Subsidiary"),  (ii) subject to compliance with the requirements
set forth in Section  3.2(b)  below,  conflict  with or violate  any law,  rule,
regulation,  order,  judgment  or decree  applicable  to Thermo  Electron or any
Material Thermo Subsidiaries  (including Merger Sub, but excluding TerraTech and
its  wholly  owned  subsidiaries)  or by which  its or any of  their  respective
properties is bound or affected,  or (iii) result in any breach of or constitute
a default (or an event that with notice or lapse of time or both would  become a
default)  under,  or impair  Thermo  Electron's  rights  or alter the  rights or
obligations  of any  third  party  under,  or  give  to  others  any  rights  of
termination,  amendment,  acceleration  or  cancellation  of,  or  result in the
creation of a lien or  encumbrance  on any of the properties or assets of Thermo
Electron  or  any  Material  Thermo  Subsidiaries  (including  Merger  Sub,  but
excluding  TerraTech and its wholly owned  subsidiaries)  pursuant to, any note,
bond,  mortgage,   indenture,   contract,  agreement,  lease,  license,  permit,
franchise or other  instrument  or  obligation  to which Thermo  Electron or any
Material Thermo Subsidiaries  (including Merger Sub, but excluding TerraTech and
its wholly owned  subsidiaries)  is a party or by which  Thermo  Electron or any


                                       10
<PAGE>

Material Thermo Subsidiaries  (including Merger Sub, but excluding TerraTech and
its wholly owned subsidiaries) or its or any of their respective  properties are
bound or affected,  except, with respect to clauses (ii) and (iii), for any such
conflicts,  violations,  defaults  or other  occurrences  that  would not have a
Material Adverse Effect on Thermo Electron.

            (b) All shares of Thermo Common Stock  issuable in  accordance  with
this  Agreement,  and  shares of Thermo  Common  Stock  which will be subject to
issuance  pursuant to the TerraTech Stock Option Plans,  the TerraTech ESPP, the
Convertible Debentures and the warrants issued by TerraTech,  each as assumed by
Thermo  Electron  pursuant  to  this  Agreement  will,  upon  issuance,  be duly
authorized,  validly  issued,  fully paid and  nonassessable  and not subject to
preemptive rights created by statute, the Certificate of Incorporation or Bylaws
of Thermo  Electron or any other  agreement or document to which Thermo Electron
is a party or by which it is bound.

            (c)  No   consent,   approval,   order  or   authorization   of,  or
registration,  declaration or filing with any Governmental Entity is required by
or with  respect  to  Thermo  Electron  or  Merger  Sub in  connection  with the
execution and delivery of this Agreement or the consummation of the transactions
contemplated hereby, except for (i) the filing of the Certificate of Merger with
the Secretary of State of Delaware,  (ii) the filing of the Proxy  Statement and
the  Registration  Statement  (as  defined  in  Section  5.1)  with  the  SEC in
accordance  with the  Securities  Act and the Exchange Act, and (iii) such other
consents,  approvals, orders,  authorizations,  registrations,  declarations and
filings as may be required under applicable federal and state securities laws.

      3.3   Capitalization.

            (a) The  authorized  capital  stock of Thermo  Electron  consists of
350,000,000  shares of Thermo Common Stock,  par value $1.00 per share, of which
there were 158,236,781  shares issued and outstanding as of October 2, 1999, and
9,011,451  shares in  treasury  as of  October 2,  1999,  and  50,000  shares of
preferred  stock,  $100 par value per share,  of which  40,000  shares have been
designated  Series B Junior  Participating  Preferred  Stock,  none of which are
issued and outstanding. All of the outstanding shares of Thermo Common Stock are
duly  authorized,  validly  issued,  fully paid and  non-assessable  and are not
subject  to  preemptive   rights   created  by  statute,   the   Certificate  of
Incorporation or Bylaws of Thermo Electron or any agreement or document to which
Thermo  Electron is a party or by which it is bound.  As of October 2, 1999,  an
aggregate of 15,653,373  shares of Thermo Common Stock,  net of exercises,  were
reserved for  issuance to  employees,  consultants  and  non-employee  directors
pursuant  to stock  option  plans  maintained  by Thermo  Electron,  under which
options are outstanding for an aggregate of 11,912,116  shares. As of October 2,
1999, an aggregate of 15,476,191 shares of Thermo Common Stock were reserved for
issuance  upon  the  conversion  of  convertible  debentures  issued  by  Thermo
Electron.  All shares of Thermo  Common Stock  subject to issuance as aforesaid,
upon issuance on the terms and conditions  specified in the instruments pursuant
to which they are issuable, will be duly authorized,  validly issued, fully paid
and non-assessable.  There are no bonds, debentures, notes or other indebtedness
of Thermo  Electron  issued and  outstanding  which  have  rights to vote in the
election  of  directors  of Thermo  Electron.  Except as set forth in the Thermo


                                       11
<PAGE>

Reports (as defined in Section  3.4) filed prior to the date of this  Agreement,
there are no other material  outstanding options,  warrants,  equity securities,
subscriptions,  calls,  rights,  commitments  or  agreements of any character to
which Thermo  Electron or any of its  subsidiaries  is a party or by which it is
bound,  obligating  Thermo  Electron to issue,  deliver or sell,  or cause to be
issued,  delivered or sold,  additional  shares of capital stock or other equity
securities of Thermo  Electron or obligating  Thermo  Electron to grant or enter
into any such option,  warrant,  equity  security,  call,  right,  commitment or
agreement.
            (b) Since July 3, 1999,  there have been no  material  issuances  of
options, warrants, equity securities,  subscriptions, calls, rights, commitments
or  agreements  of  any  character  to  which  Thermo  Electron  or  any  of its
subsidiaries is a party or by which it is bound,  obligating  Thermo Electron to
issue,  deliver or sell,  or cause to be issued,  delivered or sold,  additional
shares  of  capital  stock or other  equity  securities  of Thermo  Electron  or
obligating  Thermo  Electron  to grant or enter into any such  option,  warrant,
equity security, call, right, commitment or agreement.

            (c) As of the date of this Agreement,  no Stock  Acquisition Date or
other  event that would  result in the  occurrence  of a  Distribution  Date has
occurred (as such terms are defined in the Rights  Agreement  dated  January 19,
1996,  as amended,  by and between  Thermo  Electron and  BankBoston,  N.A. (the
"Rights  Agreement")),  with respect to the rights to purchase a unit consisting
of  one  ten-thousandth  of  a  share  of  Thermo  Electron's  Series  B  Junior
Participating Preferred Stock pursuant to the Rights Agreement.

      3.4  Reports  and  Financial  Statements.  Thermo  Electron  has filed all
material  forms,  reports and documents  required to be filed by it with the SEC
since January 1, 1997. Thermo Electron has made available to TerraTech  complete
and accurate  copies,  as amended or  supplemented,  of (a) its Annual Report on
Form 10-K for the fiscal year ended  January 2, 1999 as filed with the SEC,  and
(b) all other reports filed by Thermo Electron with the SEC under Sections 13 or
14 of the  Exchange  Act since  January 2, 1999 (such  reports are  collectively
referred to herein as the "Thermo Reports"). No event has occurred since July 3,
1999  which will be  required  to be  reported  by Thermo  Electron  on a report
required  to be filed  under  Sections  13 or 14 of the  Exchange  Act.  Without
limitation of the foregoing, since July 3, 1999, there has been no change in the
business,  financial  condition or results of operations of Thermo Electron that
has resulted or is reasonably  likely to result in a Material  Adverse Effect on
Thermo Electron.  As of their respective  dates, the Thermo Reports (i) complied
in all  material  respects  with the  requirements  of the  Exchange Act and the
applicable  rules of the SEC  thereunder  and (ii) did not  contain  any  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.  The audited financial
statements  and  unaudited  interim  financial  statements  of  Thermo  Electron
included in the Thermo  Reports (in each case  including the notes  thereto) (i)
comply  as  to  form  in  all  material  respects  with  applicable   accounting
requirements  and the published  rules and  regulations  of the SEC with respect
thereto,   (ii)  have  been  prepared  in  accordance  with  generally  accepted
accounting  principles  applied on a  consistent  basis  throughout  the periods
covered thereby (except as may be indicated therein or in the notes thereto, and
in the case of quarterly financial  statements,  as permitted by Form 10-Q under
the  Exchange  Act),  (iii)  fairly  present,  in  all  material  respects,  the


                                       12
<PAGE>

consolidated financial condition,  results of operation and cash flows of Thermo
Electron as of the  respective  dates  thereof  and for the periods  referred to
therein,  and (iv) are consistent with the books and records of Thermo Electron.
There are no  liabilities  of Thermo  Electron  which are not  disclosed  in the
Thermo  Reports  which  would be  reasonably  likely to have a Material  Adverse
Effect on Thermo Electron.

      3.5 Merger Sub.  Since the date of its  incorporation,  Merger Sub has not
engaged in any activities  other than in connection  with or as  contemplated by
this Agreement.

      3.6 Tax Treatment. As of the Effective Time, all representations contained
in the Representation Letters delivered to Hale and Dorr LLP pursuant to Section
6.1(d)  shall  be  true,   correct  and  complete  in  all  material   respects.
Stockholders of TerraTech are each third party beneficiaries of this Section 3.6
and may seek relief for breach hereof in their own names.

      3.7 Information Provided to Investment Bankers. To the knowledge of Thermo
Electron,  the information  provided by Thermo Electron and TerraTech to AH&H in
connection  with the Merger does not contain  any untrue  statement  of 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.  For  purposes  of  the  foregoing  sentence,  any
projections or  forward-looking  statements shall not be deemed to be statements
of material  facts;  however,  the  projections  were prepared in good faith and
based on  assumptions  that were  reasonable at the time such  projections  were
prepared,  given the information known by management at such time.  Furthermore,
it is recognized  that such  projections and  forward-looking  statements do not
constitute  any  warranty  as to the future  performance  of Thermo  Electron or
TerraTech and that actual results may vary from projected results.

      3.8 Litigation.  Except as discussed in the Thermo  Reports,  there are no
suits, actions, arbitrations,  demands, claims or proceedings pending, or to the
knowledge  of  Thermo  Electron,  threatened  against  Thermo  Electron  or  any
subsidiary of Thermo  Electron  which,  individually  or in the  aggregate,  are
reasonably likely to have a Material Adverse Effect on Thermo Electron.

      3.9 Compliance  with  Agreements.  The treatment  provided for herein with
respect to outstanding Convertible Debentures, options (both under the TerraTech
Stock  Option  Plans and the  TerraTech  ESPP) and  warrants of  TerraTech is in
compliance  with  the  applicable  agreements  and  instruments  governing  such
securities.  No consent  or  approval  of the  holders  of such  instruments  is
required in connection with the transactions contemplated by this Agreement.

      3.10 Registration Statement; Proxy  Statement/Prospectus.  Other than with
respect to the information  supplied by TerraTech,  the  Registration  Statement
shall not, at the time the Registration  Statement  becomes  effective under the
Securities Act, contain any untrue statement of a material fact or omit to state
any material fact necessary in order to make the statements included therein not
misleading.  The  information  supplied by Thermo  Electron for inclusion in the
Proxy  Statement  (including any  information  incorporated  by reference in the
Proxy  Statement from other filings made by Thermo  Electron with the SEC) shall
not, on the date the Proxy  Statement  is first mailed to  stockholders,  at the
time of the TerraTech  Stockholders'  Meeting or at the Effective Time,  contain
any untrue  statement  of a  material  fact or omit to state any  material  fact


                                       13
<PAGE>

required  to be stated  therein  or  necessary  in order to make the  statements
therein,  in light of the circumstances  under which they are made, not false or
misleading.  The Proxy  Statement  will  comply  (with  respect  to  information
relating  to  Thermo  Electron)  as to form in all  material  respects  with the
provisions of the Exchange Act and the rules and regulations thereunder.


                                   ARTICLE IV
                       CONDUCT PRIOR TO THE EFFECTIVE TIME

      4.1. Conduct of Business by TerraTech.  During the period from the date of
this  Agreement  and  continuing  until the earlier of the  termination  of this
Agreement pursuant to its terms or the Effective Time,  TerraTech shall,  except
for  such  actions  which  are  contemplated  by this  Agreement  or  reasonably
appropriate in connection with the transactions  contemplated by this Agreement,
and except as  consented  to by Thermo  Electron,  carry on its  business in the
usual,  regular  and  ordinary  course,  in  substantially  the same  manner  as
heretofore  conducted,  pay its debts and taxes  when due  subject to good faith
disputes  over such debts or taxes,  pay or perform other  material  obligations
when due,  and use its  commercially  reasonable  efforts  consistent  with past
practices  and policies to preserve  intact its present  business  organization,
keep  available the services of its present  officers and employees and preserve
its relationships with customers, suppliers, distributors, licensors, licensees,
and others with which it has business dealings.

      4.2  Conduct of Business  by Thermo  Electron.  During the period from the
date of this  Agreement and continuing  until the earlier of the  termination of
this Agreement  pursuant to its terms or the Effective Time, Thermo Electron (i)
shall,  except for such  actions  which are  contemplated  by this  Agreement or
reasonably appropriate in connection with the transactions  contemplated by this
Agreement,  or which are  undertaken in  connection  with the Merger or with the
reorganization of Thermo Electron and its subsidiaries as publicly  announced or
as disclosed to AH&H prior to the date of this Agreement,  carry on its business
materially in the usual,  regular and ordinary course, in substantially the same
manner as heretofore conducted, pay its debts and taxes when due subject to good
faith  disputes  over  such  debts  or  taxes,  pay or  perform  other  material
obligations when due, and use its  commercially  reasonable  efforts  consistent
with past  practices  and  policies  to  preserve  intact its  present  business
organization,  keep available the services of its present officers and employees
and  preserve  its  relationships  with  customers,   suppliers,   distributors,
licensors,  licensees,  and others with which it has business dealings; and (ii)
shall not,  and shall not permit any  Material  Thermo  Subsidiary  to, take any
action  which would make any of the  representations  and  warranties  of Thermo
Electron  contained  herein  untrue  or  cause  Thermo  Electron  not  to  be in
compliance with any covenant set forth herein.


                                    ARTICLE V
                              ADDITIONAL AGREEMENTS

      5.1. Registration Statement; Other Filings. (a) As promptly as practicable
after the  execution  of this  Agreement,  TerraTech  and Thermo  Electron  will
jointly  prepare  and file  with the SEC a  preliminary  proxy  statement  (with
appropriate requests for confidential treatment) relating to the Merger and this
Agreement  (such  proxy  statement,  as  amended  or  supplemented,  the  "Proxy
Statement"),  and  Thermo  Electron  will  prepare  and  file  with  the  SEC  a


                                       14
<PAGE>

registration statement on Form S-4 (the "Registration Statement"),  in which the
Proxy  Statement  shall be included as a  prospectus.  Thermo  Electron will use
reasonable  best  efforts to cause the  Registration  Statement  to be  declared
effective under the Securities Act as soon as practicable after such filing, and
will take all actions required under applicable federal or state securities laws
in connection with the issuance of Thermo Common Stock in the Merger. Each party
will notify the other  promptly upon the receipt of any comments from the SEC or
its staff  and of any  request  by the SEC or its staff or any other  government
officials for amendments or supplements to the Proxy Statement, the Registration
Statement or any other filing or for additional  information and will supply the
other party with copies of all  correspondence  between such party or any of its
representatives,  on the one  hand,  and the  SEC,  or its  staff  or any  other
government  officials,  on the other  hand,  with  respect  to the  Registration
Statement,  the Proxy Statement or the Merger. Whenever any event occurs that is
required  to be set forth in an  amendment  or  supplement  to the  Registration
Statement or the Proxy  Statement,  the relevant party will promptly  inform the
other party of such occurrence and cooperate in filing with the SEC or its staff
or any other government officials,  and/or mailing to stockholders of TerraTech,
such amendment or supplement.

            (b) The  information  supplied by  TerraTech  for  inclusion  in the
Registration  Statement (including any information  incorporated by reference in
the  Registration  Statement  from other filings made by TerraTech with the SEC)
will not, at the time the  Registration  Statement  (including any amendments or
supplements  thereto)  is  declared  effective  by the SEC,  contain  any untrue
statement of a material  fact or omit to state any material  fact required to be
stated therein or necessary in order to make the statements therein, in light of
the  circumstances  under which they were made, not misleading.  The information
supplied by TerraTech  for  inclusion  in the Proxy  Statement to be sent to the
stockholders  of  TerraTech  in  connection  with  the  meeting  of  TerraTech's
stockholders  to consider  the  adoption of this  Agreement  and approval of the
Merger  (the  "TerraTech  Stockholders'  Meeting")  (including  any  information
incorporated  by reference  in the Proxy  Statement  from other  filings made by
TerraTech  with the SEC)  will  not,  on the date the  Proxy  Statement  (or any
amendment   thereof  or  supplement   thereto)  is  first  mailed  to  TerraTech
stockholders,  at the time of the  TerraTech  Stockholders'  Meeting  and at the
Effective  Time,  contain any statement  which, at such time and in light of the
circumstances  under which it shall be made, is false or misleading with respect
to any  material  fact,  or shall omit to state any material  fact  necessary in
order to make the  statements  made therein not false or  misleading in light of
the circumstances under which they were made, or omit to state any material fact
necessary to correct any statement in any earlier  communication with respect to
the  solicitation of proxies for the TerraTech  Stockholders'  Meeting which has
become false or misleading.

            (c) The  information  supplied by Thermo Electron and Merger Sub for
inclusion in the Registration Statement (including any information  incorporated
by reference in the  Registration  Statement  from other  filings made by Thermo
Electron  with the  SEC)  will  not,  at the  time  the  Registration  Statement
(including any amendments or supplements  thereto) is declared  effective by the
SEC,  contain  any  untrue  statement  of a  material  fact or omit to state any
material  fact  required to be stated  therein or necessary in order to make the
statements  therein,  in light of the circumstances  under which they were made,
not misleading.  The information  supplied by Thermo Electron and Merger Sub for
inclusion in the Proxy Statement to be sent to the  stockholders of TerraTech in
connection with the TerraTech  Stockholders'  Meeting (including any information


                                       15
<PAGE>

incorporated  by reference  in the Proxy  Statement  from other  filings made by
Thermo  Electron with the SEC) will not, on the date the Proxy Statement (or any
amendment   thereof  or  supplement   thereto)  is  first  mailed  to  TerraTech
stockholders,  at the time of the  TerraTech  Stockholders'  Meeting  and at the
Effective  Time,  contain any statement  which, at such time and in light of the
circumstances  under which it shall be made, is false or misleading with respect
to any  material  fact,  or shall omit to state any material  fact  necessary in
order to make the  statements  made therein not false or  misleading in light of
the circumstances under which they were made, or omit to state any material fact
necessary to correct any statement in any earlier  communication with respect to
the  solicitation of proxies for the TerraTech  Stockholders'  Meeting which has
become false or misleading.

            (d) The Proxy  Statement  will  include  the  recommendation  of the
Special  Committee  in favor of  approval  of this  Agreement  (except  that the
Special   Committee   may   withdraw,   modify  or  refrain   from  making  such
recommendation  to the  extent  that  the  Special  Committee  determines  after
consultation  with  outside  legal  counsel  that  failure  to  do so  would  be
inconsistent  with the Special  Committee's  fiduciary  duties under  applicable
law).

            (e) The Proxy Statement will include the recommendation of the Board
of Directors of  TerraTech in favor of approval of this  Agreement  (except that
the Board of Directors of TerraTech may withdraw,  modify or refrain from making
such  recommendation to the extent that the Board determines after  consultation
with outside legal counsel that failure to do so would be inconsistent  with the
Board's fiduciary duties under applicable law).

            (f) To the extent that the Special Committee or the Board withdraws,
modifies or refrains from making their  respective  recommendations  pursuant to
Sections 5.1(d) or (e) hereof, the Proxy Statement will reflect such action.

      5.2.  Meeting of TerraTech  Stockholders.  Promptly after the date hereof,
TerraTech  will take all action  necessary in  accordance  with the DGCL and its
Certificate of Incorporation  and Bylaws to convene the TerraTech  Stockholders'
Meeting to be held as  promptly  as  practicable  for the purpose of voting upon
this Agreement.  Unless the Special Committee determines after consultation with
outside  legal counsel that to do so would be  inconsistent  with the Board's or
the Special  Committee's  fiduciary duties under applicable law,  TerraTech will
use its  reasonable  best  efforts to solicit from its  stockholders  proxies in
favor of the approval of this Agreement and the Merger,  and will take all other
action  necessary or advisable to secure the vote or consent of its stockholders
required by the DGCL to obtain such  approvals.  Thermo  Electron shall vote, or
cause to be voted, all of the TerraTech Common Stock then owned by it and any of
its subsidiaries in favor of the approval of this Agreement and the Merger.

      5.3. Access to Information. Subject to applicable legal restrictions, each
of the  parties  hereto  will  afford  the  other  (including,  in the  case  of
TerraTech,  the Special  Committee)  and each of their  respective  accountants,
counsel and other representatives reasonable access during normal business hours
to the  properties,  books,  records  and  personnel  of each of them during the
period prior to the  Effective  Time to obtain all  information  concerning  the
their respective  businesses,  including the status of their respective  product
development efforts, properties, results of operations and personnel, as each of


                                       16
<PAGE>

them may reasonably request. Each of the parties hereto agrees that it will, and
will  cause  its  representatives  and  agents  to,  keep all  such  information
confidential and will not, and will cause its  representatives or agents not to,
use any  information  obtained  pursuant  to this  Section  5.3 for any  purpose
unrelated  to  the  consummation  of  the  transactions   contemplated  by  this
Agreement.  Notwithstanding  the foregoing,  none of the parties hereto shall be
required to keep  confidential any information (i) which is or becomes generally
available to the public,  other than by wrongful  disclosure  by the  disclosing
party in violation  of this  Agreement  or (ii) which  becomes  available to the
disclosing  party  on a  nonconfidential  basis  from a  source  other  than the
nondisclosing party or any officer or director of such party.

      5.4.  Public  Disclosure.  Thermo Electron and TerraTech will consult with
each other  before  issuing  any press  release or  otherwise  making any public
statement  with respect to the Merger or this  Agreement  and will not issue any
such press release or make any such public statement prior to such consultation,
except  as may be  required  by law or any  listing  agreement  with a  national
securities  exchange.  Promptly  upon the  execution  hereof,  the parties shall
jointly make a press release with respect to the  transactions  contemplated  by
this Agreement,  in form reasonably  satisfactory to the Special Committee,  and
TerraTech shall,  within five days after the execution hereof, file with the SEC
a Current Report on Form 8-K, which shall attach as an exhibit this Agreement.

      5.5. Legal Requirements.  Subject to the terms of this Agreement,  each of
Thermo  Electron,  Merger Sub and  TerraTech  will take all  reasonable  actions
necessary or desirable to comply promptly with all legal  requirements  that may
be  imposed  on  them  with  respect  to the  consummation  of the  transactions
contemplated by this Agreement (including furnishing all information required in
connection  with  approvals  of or filings  with any  Governmental  Entity,  and
including  using its reasonable  best efforts to defend any litigation  prompted
hereby) and will promptly  cooperate  with and furnish  information to any party
hereto  necessary in connection with any such  requirements  imposed upon any of
them or their respective subsidiaries in connection with the consummation of the
transactions contemplated by this Agreement.

      5.6.  Notification  of  Certain  Matters.  Subject  to the  terms  of this
Agreement,  Thermo Electron and Merger Sub will give prompt notice to TerraTech,
and TerraTech will give prompt notice to Thermo Electron, of the occurrence,  or
failure to occur,  of any event,  which  occurrence or failure to occur would be
reasonably likely to cause (a) any  representation or warranty contained in this
Agreement to be untrue or  inaccurate  in any material  respect at any time from
the date of this Agreement to the Effective Time, or (b) any material failure of
Thermo  Electron  and  Merger  Sub or  TerraTech,  as the case may be, or of any
officer,  director,  employee  or agent  thereof,  to comply with or satisfy any
covenant,  condition or  agreement to be complied  with or satisfied by it under
this Agreement. From the date of this Agreement until the Effective Time, Thermo
Electron will give prompt notice to TerraTech  (including,  without  limitation,
the Special  Committee)  of any  written  offers or  indications  of interest it
receives  from a prospective  purchaser of any material  properties or assets of
TerraTech or its subsidiaries, which set forth a proposed purchase price greater
than $3 million  or in which the book value of the assets  being sold is greater
than $3 million,  other than sales of assets and services in the ordinary course
of business.  Notwithstanding  the above, the delivery of any notice pursuant to
this section will not limit or otherwise affect the remedies available hereunder
to the party receiving such notice or the conditions to such party's  obligation
to consummate the Merger.

                                       17
<PAGE>

      5.7. Best Efforts and Further Assurances. Subject to the respective rights
and obligations of Thermo  Electron and TerraTech under this Agreement,  each of
the parties to this Agreement will use its reasonable best efforts to effectuate
the Merger and the other  transactions  contemplated  hereby and to fulfill  and
cause to be fulfilled the conditions to closing under this  Agreement,  it being
understood  that such  efforts  shall not include any  obligation  to settle any
litigation  prompted hereby.  Subject to the terms hereof, each party hereto, at
the  reasonable  request of another party hereto,  will execute and deliver such
other  instruments  and do and  perform  such  other  acts and  things as may be
reasonably  necessary or desirable for effecting  completely the consummation of
the transactions contemplated hereby.

      5.8.  Stock Option and Employee  Stock  Purchase  Plans;  Reservation of
Shares.

            (a) At the  Effective  Time,  each  outstanding  option to  purchase
shares of TerraTech  Common Stock (each a "TerraTech  Stock  Option")  under the
TerraTech  Stock Option Plans,  whether or not  exercisable,  will be assumed by
Thermo Electron. Each TerraTech Stock Option so assumed by Thermo Electron under
this  Agreement  will  continue  to have,  and be subject to, the same terms and
conditions set forth in the applicable  TerraTech Stock Option Plan  immediately
prior to the Effective  Time  (including,  without  limitation,  any  repurchase
rights),  except that (i) each TerraTech  Stock Option will be  exercisable  (or
will become  exercisable in accordance  with its terms) for that number of whole
shares of Thermo  Common  Stock  equal to the product of the number of shares of
TerraTech  Common Stock that were issuable upon exercise of such TerraTech Stock
Option  immediately prior to the Effective Time multiplied by the Exchange Ratio
and (ii) the per share  exercise  price for the  shares of Thermo  Common  Stock
issuable upon exercise of such assumed  TerraTech  Stock Option will be equal to
the quotient  determined  by dividing the exercise  price per share of TerraTech
Common Stock at which such TerraTech  Stock Option was  exercisable  immediately
prior to the  Effective  Time by the Exchange  Ratio,  rounded up to the nearest
whole cent. After the Effective Time,  Thermo Electron will issue to each holder
of an  outstanding  TerraTech  Stock Option a notice  describing  the  foregoing
assumption of such TerraTech Stock Option by Thermo Electron.

            (b) At the  Effective  Time,  each  outstanding  option to  purchase
shares of TerraTech  Common Stock (each, a "TerraTech  ESPP Stock Option") under
the TerraTech ESPP will be assumed by Thermo Electron. Each TerraTech ESPP Stock
Option so assumed by Thermo  Electron will continue to have,  and be subject to,
the same terms and conditions as are set forth in the TerraTech ESPP immediately
prior  to the  Effective  Time  except  that  (i) the  assumed  option  shall be
exercisable  (or will become  exercisable in accordance with its terms) for that
number of whole shares of Thermo Common Stock equal to the product of the number
of shares of TerraTech  Common Stock that would have been issuable upon exercise
of such TerraTech ESPP Stock Option  multiplied by the Exchange Ratio;  (ii) the
purchase  price  per  share of  Thermo  Common  Stock  shall be the lower of (A)
eighty-five  percent (85%) of (x) the per-share Market Value of TerraTech Common
Stock on the Grant Date divided by (y) the Exchange  Ratio,  with the  resulting
price rounded up to the nearest whole cent, and (B) eighty-five percent (85%) of
the Market Value of Thermo Common Stock as of the Exercise  Date;  and (iii) the


                                       18
<PAGE>

$25,000  limit under Section  9.2(i) of the  TerraTech  ESPP shall be applied by
taking into account  Thermo  Electron's  assumption of the TerraTech  ESPP Stock
Options in accordance with the Code and applicable regulations.  For purposes of
this  subsection,  "Market  Value," "Grant Date," and "Exercise Date" shall have
the meaning given them in the TerraTech ESPP.

            (c) Thermo Electron will reserve  sufficient shares of Thermo Common
Stock for  issuance  under this Section 5.8 and  pursuant to  conversion  of the
Convertible Debentures and the exercise of warrants issued by TerraTech.

      5.9.   Thermo  Electron  Form  S-8.  Thermo  Electron  agrees  to  file  a
registration  statement  on Form S-8 or, if  possible,  an  amendment  to Thermo
Electron's then effective  registration statement on Form S-8, for the shares of
Thermo Common Stock issuable with respect to the assumed TerraTech Stock Options
and the assumed  TerraTech  ESPP Stock Options  within five (5) business days of
the Effective Time, and shall keep such registration  statement effective for so
long as any such options remain outstanding.

      5.10.  Thermo Electron Form S-3. Thermo Electron agrees to file,  promptly
after the date of this Agreement,  a registration statement on Form S-3 to cover
the shares of Thermo  Common  Stock  issuable  upon the exercise of the warrants
issued by TerraTech (the "Warrant Share S-3"), and shall keep such Warrant Share
S-3 effective  until all of the shares of Thermo  Common Stock  covered  thereby
have been sold  pursuant  thereto or until,  by reason of Rule 144(k)  under the
Securities Act or any other rule of similar effect,  the shares of Thermo Common
Stock covered  thereby are no longer  required to be  registered  for the public
sale thereof by the holders of such  securities  or the warrants have expired by
their terms.

      5.11. Indemnification; Insurance.

            (a) The  Certificate  of  Incorporation  and Bylaws of the Surviving
Corporation  will contain the  provisions  with respect to  indemnification  and
elimination  of liability for monetary  damages set forth in the  Certificate of
Incorporation  and Bylaws of TerraTech,  which  provisions  will not be amended,
repealed or otherwise  modified for a period of six (6) years from the Effective
Time in any  manner  that  would  adversely  affect  the  rights  thereunder  of
individuals  who,  as of the date hereof and at any time from the date hereof to
the  Effective  Time,  were  directors  or  officers of  TerraTech,  unless such
modification  is required by law. The Surviving  Corporation  shall,  and Thermo
Electron  will cause the  Surviving  Corporation  to,  fulfill  and honor in all
respects the indemnification obligations of TerraTech pursuant to the provisions
of the Certificate of Incorporation  and the Bylaws of TerraTech as in effect on
the date of this Agreement.

            (b) For a period of six (6) years after the Effective  Time,  Thermo
Electron shall cause the Surviving  Corporation  to, either  directly or through
participation  in  Thermo  Electron's  umbrella  policy,  maintain  in  effect a
directors' and officers'  liability  insurance  policy  covering those TerraTech
directors  and  officers  currently  covered  by  Thermo  Electron's   liability
insurance  policy  with  coverage  no less  favorable  in amount  and scope than
existing coverage for such TerraTech  directors and officers (which coverage may
be an  endorsement  extending  the period in which claims may be made under such


                                       19
<PAGE>

existing  policy);  provided,  however,  that in no event  shall  the  Surviving
Corporation  be required to expend to  maintain  or procure  insurance  coverage
pursuant  to this  Section  5.11,  directly or through  participation  in Thermo
Electron's  policy,  an amount per annum in excess of 175% of the current annual
premiums,  as  adjusted  for  inflation  each  year,  allocable  and  payable by
TerraTech  (the "Maximum  Premium") with respect to such  insurance,  or, if the
cost of such  insurance  exceeds the  Maximum  Premium,  the  maximum  amount of
coverage that can be purchased or maintained for the Maximum Premium.

            (c)  TerraTech   shall,  to  the  fullest  extent   permitted  under
applicable law and regardless of whether the Merger becomes effective, indemnify
and hold  harmless  Polyvios  Vintiadis  ("Vintiadis")  against  all  costs  and
expenses (including attorneys' fees), judgments, fines, losses, claims, damages,
liabilities and settlement  amounts paid in connection  with any claim,  action,
suit, proceeding or investigation,  whether civil,  criminal,  administrative or
investigative,  arising  out of or  pertaining  to any  action  or  omission  in
Vintiadis' capacity as a director (including, without limitation, as a member of
the Special Committee) or fiduciary of TerraTech (including, without limitation,
in connection with the  transactions  contemplated by this Agreement)  occurring
on,  before or after the  Effective  Time (or, if this  Agreement is  terminated
without the Merger becoming effective, occurring on, before or after the date of
such termination),  until the expiration of the statute of limitations  relating
thereto (and shall pay any expenses in advance of the final  disposition of such
action  or  proceeding  to  Vintiadis  to the  fullest  extent  permitted  under
applicable law, upon receipt from Vintiadis of an undertaking (which need not be
secured  or  subject  to a bond or  other  requirement)  to repay  any  advanced
expenses if it shall  ultimately be determined that Vintiadis is not entitled to
be indemnified against such expenses).  If the Merger becomes effective,  Thermo
Electron  shall be jointly and  severally  responsible,  to the  fullest  extent
permitted by applicable law (it being  understood that applicable law may permit
Thermo   Electron  to   indemnify  or  advance   expenses  to  Vintiadis   under
circumstances in which TerraTech could not do so), for the  indemnification  and
advancement of expenses  obligations  provided for in the first sentence of this
Section 5.11(c). If the Merger does not become effective,  Thermo Electron shall
have the same  responsibilities set forth in the immediately preceding sentence,
except that Thermo  Electron shall have no  responsibility  for  indemnifying or
advancing expenses to Vintiadis with respect to matters that do not arise out of
or  pertain  to the  work  of  the  Special  Committee,  this  Agreement  or the
transactions  contemplated  hereby.  In the event of any  claim,  action,  suit,
proceeding or  investigation  covered by this Section  5.11(c),  (i)  TerraTech,
Thermo Electron and the Surviving Corporation, as the case may be, shall pay the
reasonable  fees and expenses of counsel  selected by Vintiadis,  promptly after
statements  therefor are received,  and (ii) TerraTech,  Thermo Electron and the
Surviving  Corporation  shall  cooperate  in the  defense  of any  such  matter;
provided,  however, that neither TerraTech nor Thermo Electron nor the Surviving
Corporation  shall  be  liable  for  any  settlement   effected  without  Thermo
Electron's  prior written consent (such consent not to be unreasonably  withheld
or  delayed);  and  provided,  further,  that  , in  the  event  any  claim  for
indemnification is asserted or made within the period prior to the expiration of
the applicable statute of limitations,  all rights to indemnification in respect
of such claim shall continue until the  disposition of such claim. In connection
with  Thermo  Electron  or the  Surviving  Corporation  making  any  payment  or
advancing any funds  pursuant to this Section  5.11(c),  Thermo  Electron or the
Surviving  Corporation,  as the  case  may be,  shall  be  entitled  to  require
Vintiadis to use  commercially  reasonable  efforts,  at the cost and expense of
Thermo Electron and the Surviving  Corporation,  to cause Thermo Electron or the
Surviving Corporation, as the case may be, to be subrogated to Vintiadis' rights
under any insurance  coverage  maintained by the Surviving  Corporation,  Thermo
Electron or any of their  respective  affiliates  with respect to the underlying
subject matter of, and to the extent of, such payment or advance.

                                       20
<PAGE>

            (d)  In the  event  TerraTech,  Thermo  Electron  or  the  Surviving
Corporation or any of their  respective  successors or assigns (i)  consolidates
with or  merges  into any  other  person  and  shall  not be the  continuing  or
surviving  corporation  or  entity  of such  consolidation  or  merger,  or (ii)
transfers all or  substantially  all of its  properties or assets to any person,
then,  and in each  such  case,  proper  provision  shall  be  made so that  the
successors  and  assigns  of  TerraTech,   Thermo  Electron  and  the  Surviving
Corporation,  as the case may be, shall assume the obligations set forth in this
Section 5.11.

            (e) Heirs, representatives and estates of the officers and directors
of TerraTech (including, without limitation,  Vintiadis) shall have the right to
enforce the obligations arising under this Section 5.11.

            (f)  The  rights  of  the  officers   and   directors  of  TerraTech
(including,  without  limitation,  Vintiadis)  under  this  Section  5.11 are in
addition to any rights of such persons under separate indemnification agreements
any such  persons may have with  TerraTech  and/or  Thermo  Electron,  under the
Certificate  of  Incorporation  or Bylaws of  TerraTech  or Thermo  Electron  or
otherwise.

      5.12. Deferred Compensation Plan. Subject to obtaining the consents of the
affected   participants,   at  the  Effective   Time,  the  TerraTech   Deferred
Compensation  Plan  for  Directors  (the  "Deferred   Compensation  Plan")  will
terminate,  and TerraTech will  distribute to each  participant  the sum in cash
equal to the balance of stock units credited to his or her deferred compensation
account under the Deferred Compensation Plan as of the Effective Time multiplied
by the Exchange Ratio.

      5.13  Compliance by Merger Sub.  Thermo Electron shall cause Merger Sub to
timely perform and comply with all of its  obligations  under or related to this
Agreement.

      5.14 Tax Treatment.  From and after the date of this  Agreement  until the
Effective Time,  neither Thermo Electron nor Merger Sub will take, or permit any
of Thermo  Electron's  direct or indirect  subsidiaries to take, any action that
would cause the Merger not to be a tax-free  reorganization under Section 368(a)
of the Code.  Notwithstanding  anything in this Agreement to the contrary,  this
Section  5.14 shall  survive the Closing and shall apply  without  regard to any
disclosure  made on behalf of Thermo  Electron  or Merger Sub.  Stockholders  of
TerraTech are each third party  beneficiaries  of this Section 5.14 and may seek
relief for breach hereof in their own names.

      5.15 NYSE Listing. Thermo Electron shall use its best efforts to cause all
shares of Thermo Common Stock  issuable to  stockholders  of TerraTech,  and all
shares of Thermo Common Stock which will be subject to issuance  pursuant to the
TerraTech Stock Option Plans, the TerraTech ESPP, the Convertible Debentures and
the warrants issued by TerraTech, each as assumed by Thermo Electron pursuant to
this Agreement, to be authorized for listing on the New York Stock Exchange.


                                       21
<PAGE>




                                   ARTICLE VI
                            CONDITIONS TO THE MERGER

      6.1.  Conditions to  Obligations  of Each Party to Effect the Merger.  The
respective  obligations  of each  party to this  Agreement  to effect the Merger
shall be subject to the  satisfaction  at or prior to the Effective  Time of the
following conditions:

            (a) No Order.  No  Governmental  Entity shall have enacted,  issued,
promulgated, enforced or entered any statute, rule, regulation, executive order,
decree, injunction or other order (whether temporary,  preliminary or permanent)
which is in effect  and which has the  effect of making  the  Merger  illegal or
otherwise prohibiting consummation of the Merger.

            (b)  Registration  Statements.  The  Registration  Statement and the
Warrant  Share S-3 shall  have been  declared  effective  by the SEC and no stop
order suspending the effectiveness of the Registration  Statement or the Warrant
Share S-3 shall have been issued and no proceedings  for that purpose shall have
been initiated or threatened by the SEC.

            (c) NYSE  Listing.  The Thermo  Common Stock  issuable to holders of
TerraTech  Common  Stock and all  shares of Thermo  Common  Stock  which will be
subject to issuance  pursuant to the TerraTech Stock Option Plans, the TerraTech
ESPP, the Convertible  Debentures and the warrants issued by TerraTech,  each as
assumed  by  Thermo  Electron  pursuant  to  this  Agreement,  shall  have  been
authorized for listing on the New York Stock Exchange.

            (d) Tax Opinion.  TerraTech and Thermo  Electron shall have received
an opinion from Hale and Dorr LLP, dated the Closing Date, in substantially  the
form attached to this Agreement,  regarding  certain tax matters relating to the
transactions  contemplated under this Agreement,  including that the Merger will
be treated for federal income tax purposes as a tax-free  reorganization  within
the  meaning of Section  368(a) of the Code,  in form and  substance  reasonably
satisfactory to TerraTech (including the Special Committee) and Thermo Electron.
Such   opinion   shall  be  based  upon  factual   representations   (reasonably
satisfactory to TerraTech (including the Special Committee) and Thermo Electron)
from TerraTech and Thermo Electron  contained in certain letters to be delivered
to Hale and Dorr LLP (the "Representation Letters").

            (e)  Stockholder  Approval.  This Agreement shall have been approved
and  adopted  by the  requisite  vote  under  the  DGCL by the  stockholders  of
TerraTech.

            (f) Rights Agreement.  No Stock Acquisition Date or other event that
would result in the  occurrence of a  Distribution  Date shall have occurred (as
such terms are defined in the Rights  Agreement),  with respect to the rights to
purchase a unit consisting of one ten-thousandth of a share of Thermo Electron's
Series B Junior Participating Preferred Stock pursuant to the Rights Agreement.

      6.2. Additional Conditions to Obligations of TerraTech. The obligations of
TerraTech  to  consummate  and  effect  the  Merger  shall  be  subject  to  the
satisfaction  at or  prior  to the  Effective  Time  of  each  of the  following
conditions,  any of which may be waived,  in writing,  exclusively  by TerraTech
(provided that the Special Committee shall have consented in writing to any such
waiver):

                                       22
<PAGE>

            (a)   Representations   and  Warranties.   The  representations  and
warranties of Thermo  Electron and Merger Sub contained in this Agreement  shall
be true and correct in all material respects (other than those already qualified
by a materiality  standard,  which shall be true and correct in all respects) on
and as of the Effective Time, except for changes expressly  contemplated by this
Agreement  and except for those  representations  and  warranties  that  address
matters only as of a particular  date (which shall remain true and correct as of
such  particular  date),  with the same force and effect as if made on and as of
the  Effective  Time;  and TerraTech  shall have received a certificate  to such
effect signed on behalf of Thermo  Electron by the  President,  Chief  Executive
Officer or Vice President of Thermo Electron.

            (b) Agreements and Covenants.  Thermo  Electron and Merger Sub shall
have  performed or complied in all material  respects  with all  agreements  and
covenants required by this Agreement to be performed or complied with by them on
or prior to the Effective  Time, and TerraTech shall have received a certificate
to such  effect  signed on behalf of Thermo  Electron  by the  President,  Chief
Executive Officer or Vice President of Thermo Electron.

            (c) Fairness Opinion.  At the time of mailing of the Proxy Statement
to the  stockholders  of TerraTech  and at the  Effective  Time,  AHH shall have
reaffirmed orally the fairness opinion  previously  prepared and delivered by it
to the Special Committee and AHH shall not have withdrawn such opinion.

            (d) State  Securities  Laws. Any and all necessary state  securities
approvals  for the issuance of Thermo  Common Stock  pursuant to this  Agreement
shall have been obtained.

      6.3.  Additional  Conditions  to the  Obligations  of Thermo  Electron and
Merger Sub. The  obligations of Thermo Electron and Merger Sub to consummate and
effect  the  Merger  shall be  subject  to the  satisfaction  at or prior to the
Effective Time of each of the following conditions,  any of which may be waived,
in writing, exclusively by Thermo Electron:

            (a)   Representations   and  Warranties.   The  representations  and
warranties of TerraTech contained in this Agreement shall be true and correct in
all material  respects  (other than those  already  qualified  by a  materiality
standard,  which  shall be true and  correct in all  respects)  on and as of the
Effective Time, except for changes contemplated by this Agreement and except for
those  representations  and  warranties  that  address  matters  only  as  of  a
particular  date (which  shall  remain  true and  correct as of such  particular
date),  with the same  force and  effect  as if made on and as of the  Effective
Time,  except,  in all such  cases,  where the failure to be so true and correct
would not have a Material  Adverse Effect on TerraTech;  and Thermo Electron and
Merger Sub shall have received a certificate  to such effect signed on behalf of
TerraTech  by the  President,  Chief  Executive  Officer  or Vice  President  of
TerraTech.

            (b)  Agreements  and  Covenants.  TerraTech  shall have performed or
complied in all material respects with all agreements and covenants  required by
this  Agreement  to be  performed  or  complied  with by it on or  prior  to the
Effective  Time,  and Thermo  Electron shall have received a certificate to such
effect signed on behalf of TerraTech by the President,  Chief Executive  Officer
or Vice President of TerraTech.

                                       23
<PAGE>

            (c) No Withdrawal of Special Committee  Recommendation.  The Special
Committee shall not have withdrawn its  recommendation to the Board of Directors
of TerraTech as set forth in Section 2.4 hereof.

                                   ARTICLE VII
                        TERMINATION, AMENDMENT AND WAIVER

      7.1.  Termination.  This  Agreement may be terminated at any time prior to
the  Effective  Time of the  Merger,  whether  before or after  approval of this
Agreement by the stockholders of TerraTech:

            (a) by mutual  written  consent  duly  authorized  by the  Boards of
Directors of Merger Sub and TerraTech (upon approval of the Special Committee);

            (b) by either TerraTech (at the direction of the Special  Committee)
or Merger Sub if the Merger shall not have been  consummated  by March 31, 2000;
provided, however, that the right to terminate this Agreement under this Section
7.1(b)  shall not be  available  to any party whose action or failure to act has
been a  principal  cause of or resulted in the failure of the Merger to occur on
or before  such date if such  action or failure to act  constitutes  a breach of
this Agreement;

            (c) by either TerraTech (upon approval of the Special  Committee) or
Merger Sub if a court of competent  jurisdiction or governmental,  regulatory or
administrative agency or commission shall have issued an order, decree or ruling
or taken any  other  action  (an  "Order"),  in any case  having  the  effect of
permanently  restraining,  enjoining or otherwise  prohibiting the Merger, which
order, decree or ruling is final and nonappealable;

            (d) by either TerraTech (upon approval of the Special  Committee) or
Merger  Sub  if  the  required   approval  of  the   stockholders  of  TerraTech
contemplated  by this  Agreement  shall not have been  obtained by reason of the
failure  to  obtain  the  required  vote  upon  a vote  taken  at a  meeting  of
stockholders duly convened therefor or at any adjournment thereof (provided that
the right to terminate  this  Agreement  under this Section  7.1(d) shall not be
available  to  TerraTech  where the  failure to obtain  stockholder  approval of
TerraTech shall have been caused by the action or failure to act of TerraTech in
breach of this Agreement and the right to terminate  this  Agreement  under this
Section  7.1(d) shall not be available to Merger Sub where the failure to obtain
the requisite vote by the  stockholders  of TerraTech  shall have been caused by
the failure of Thermo  Electron or any direct or indirect  subsidiary  of Thermo
Electron  (whether or not  wholly-owned)  to vote its shares of TerraTech Common
Stock in favor of the Merger and this Agreement);

            (e)  by  TerraTech  if  the  Special   Committee   determines  after
consultation  with  outside  legal  counsel  that  failure  to  do so  would  be
inconsistent with the Board's or the Special Committee's  fiduciary duties under
applicable law;

                                       24
<PAGE>

            (f) by TerraTech  (upon approval of the Special  Committee),  upon a
breach of any  representation,  warranty,  covenant or  agreement on the part of
Thermo Electron or Merger Sub set forth in this Agreement, if (i) as a result of
such breach the  conditions  set forth in Section 6.2(a) or Section 6.2(b) would
not be  satisfied  as of the time of such breach and (ii) such breach  shall not
have been cured by Thermo  Electron or Merger Sub within ten (10)  business days
following  receipt by Thermo  Electron  of written  notice of such  breach  from
TerraTech; or

            (g) by Merger Sub,  upon a breach of any  representation,  warranty,
covenant or agreement on the part of TerraTech set forth in this  Agreement,  if
(i) as a result of such  breach the  conditions  set forth in Section  6.3(a) or
Section  6.3(b)  would not be  satisfied  as of the time of such breach and (ii)
such breach shall not have been cured by TerraTech within ten (10) business days
following receipt by TerraTech of written notice of such breach from Merger Sub.

            (h) by  Merger  Sub at the  direction  of Thermo  Electron  if, as a
result of an adjustment in the Exchange Ratio pursuant to Section 1.6(g) hereof,
Thermo Electron would be required to issue more than 1,800,000  shares of Thermo
Common  Stock  (exclusive  of shares  issuable  upon the  exercise of options or
warrants or the conversion of convertible  debentures outstanding on the date of
this  Agreement;  and subject to adjustment  for any stock split,  reverse stock
split, stock dividend, recapitalization or other like change).

      7.2. Notice of Termination; Effect of Termination. Any termination of this
Agreement  under  Section  7.1  above  will be  effective  immediately  upon the
delivery of written notice by the terminating  party to the other parties hereto
(or,  in the case of a  termination  pursuant to Section  7.1(f) or 7.1(g),  the
expiration of the ten business day period referred to therein).  In the event of
the  termination  of this  Agreement as provided in Section 7.1, this  Agreement
shall be of no further  force or  effect,  except  that (i) the  confidentiality
obligations  of each party hereto  contained  in Section  5.3,  the  obligations
contained in Section 5.11, and the provisions of Sections 7.2, 7.3 and 8.1 shall
survive any such  termination  and (ii) nothing  herein shall  relieve any party
from liability for any willful and material breach of this Agreement.

      7.3. Fees and Expenses.  All fees and expenses incurred in connection with
this  Agreement and the  transactions  contemplated  hereby shall be paid by the
party incurring such expenses, whether or not the Merger is consummated.

      7.4.  Amendment.  Subject to applicable law, this Agreement may be amended
by the  parties  hereto at any time by  execution  of an  instrument  in writing
signed  on  behalf  of each  of the  parties  hereto;  provided,  however,  that
TerraTech  may not amend this  Agreement  without  the  approval  of the Special
Committee.

      7.5. Extension;  Waiver. At any time prior to the Effective Time any party
hereto  may,  to the  extent  legally  allowed,  (i)  extend  the  time  for the
performance of any of the obligations or other acts of the other parties hereto,
(ii) waive any inaccuracies in the  representations  and warranties made to such
party contained  herein or in any document  delivered  pursuant hereto and (iii)
waive  compliance  with any of the  agreements or conditions  for the benefit of
such party contained herein; provided,  however, that TerraTech may not take any
such actions without the approval of the Special Committee. Any agreement on the
part of a party  hereto to any such  extension  or waiver shall be valid only if
set forth in an instrument in writing signed on behalf of such party.

                                       25
<PAGE>

                                  ARTICLE VIII
                               GENERAL PROVISIONS

      8.1.  Non-Survival of Representations and Warranties.  The representations
and  warranties of TerraTech,  Thermo  Electron and Merger Sub contained in this
Agreement  (other than those  contained in Section  3.6) shall  terminate at the
Effective  Time, and only the covenants  that by their terms,  or as the context
requires, survive the Effective Time shall survive the Effective Time.

      8.2. Notices. All notices and other  communications  hereunder shall be in
writing  and shall be deemed  given if  delivered  personally  or by  commercial
delivery service, or sent via telecopy (receipt confirmed) to the parties at the
following  addresses or telecopy  numbers (or at such other  address or telecopy
numbers for a party as shall be specified by like notice):

            (a)   if to Thermo Electron or Merger Sub, to:
                  Thermo Electron Corporation
                  81 Wyman Street
                  Waltham, MA 02454
                  Attention:  President
                              Telephone: (781) 622-1000
                              Facsimile: (781) 622-1283
                  with a copy  (which  shall  not  constitute  notice  to Thermo
Electron or Merger Sub) to:

                  Thermo Electron Corporation
                  81 Wyman Street
                  Waltham, MA  02454
                  Attention:  General Counsel
                              Telephone: (781) 622-1000
                              Facsimile: (781) 622-1283

            (b)   if to TerraTech, to:
                  Thermo TerraTech Inc.
                  85 First Avenue
                  Waltham, MA 02451
                  Attention:  President
                              Telephone: (781) 370-1640
                              Facsimile: (781) 370-1615

                  with a copy  (which  shall  not  constitute  notice to
TerraTech) to:

                  Choate, Hall & Stewart
                  Exchange Place
                  53 State Street
                  Boston, MA 02109
                  Attention:  William P. Gelnaw, Jr., Esq.
                              Telephone: (617) 248-5000
                              Facsimile: (617) 248-4000

                                       26
<PAGE>

      8.3.  Counterparts.  This  Agreement  may  be  executed  in  one  or  more
counterparts,  all of which shall be considered  one and the same  agreement and
shall become effective when one or more counterparts have been signed by each of
the parties and  delivered  to the other  party,  it being  understood  that all
parties need not sign the same counterpart.

      8.4.  Entire  Agreement.  This Agreement and the documents and instruments
and other  agreements among the parties hereto as contemplated by or referred to
herein (a) constitute the entire agreement among the parties with respect to the
subject  matter hereof and supersede all prior  agreements  and  understandings,
both  written and oral,  among the parties  with  respect to the subject  matter
hereof,  with  the  exception  of the  agreements  relating  to the  Convertible
Debentures,  the TerraTech ESPP, the TerraTech Stock Option Plans,  the warrants
issued by TerraTech, the Deferred Compensation Plan, and any agreements relating
to  indemnification  of members of the Board; and (b) are not intended to confer
upon any other person any rights or remedies  hereunder,  except as set forth or
otherwise  contemplated  herein.  Notwithstanding  the  foregoing,  Section 5.11
hereof is  intended to be for the  benefit  of, and may be  enforced  by,  those
individuals  who,  as of the date hereof and at any time from the date hereof to
the Effective Time, were directors or officers of TerraTech.

      8.5.  Severability.  In the event that any provision of this  Agreement or
the  application  thereof,  becomes  or is  declared  by a  court  of  competent
jurisdiction  to be  illegal,  void  or  unenforceable,  the  remainder  of this
Agreement  will  continue in full force and effect and the  application  of such
provision to other persons or circumstances will be interpreted so as reasonably
to effect the intent of the parties hereto. The parties further agree to replace
such  void or  unenforceable  provision  of  this  Agreement  with a  valid  and
enforceable  provision that will achieve, to the extent possible,  the economic,
business and other purposes of such void or unenforceable provision.

      8.6. Other Remedies;  Specific  Performance.  Except as otherwise provided
herein,  any and all remedies  herein  expressly  conferred upon a party will be
deemed  cumulative with and not exclusive of any other remedy conferred  hereby,
or by law or equity  upon such  party,  and the  exercise  by a party of any one
remedy will not preclude the exercise of any other  remedy.  The parties  hereto
agree  that  irreparable  damage  would  occur  in  the  event  that  any of the
provisions  of this  Agreement  were not  performed  in  accordance  with  their
specific terms or were  otherwise  breached.  It is accordingly  agreed that the
parties shall be entitled to an injunction or injunctions to prevent breaches of
this Agreement and to enforce  specifically  the terms and provisions  hereof in
any court of the United States or any state having  jurisdiction,  this being in
addition to any other remedy to which they are entitled at law or in equity.

                                       27
<PAGE>

      8.7.  Governing Law. This Agreement  shall be governed by and construed in
accordance with the laws of the Commonwealth of Massachusetts, regardless of the
laws that might otherwise govern under applicable principles of conflicts of law
thereof, except to the extent that the DGCL applies.

      8.8.  Assignment.  No party may assign either this Agreement or any of its
rights,  interests,  or obligations hereunder without the prior written approval
of the other parties.

      8.9 Headings.  The headings  contained in this Agreement are for reference
purposes only and shall not in any way affect the meaning or  interpretation  of
this Agreement.





              [The rest of this page intentionally left blank.]


                                       28
<PAGE>



      IN WITNESS WHEREOF, Thermo Electron,  Merger Sub and TerraTech have caused
this  Agreement to be signed by themselves or their duly  authorized  respective
officers, all as of the date first written above.


                                   THERMO ELECTRON CORPORATION



                                   By:  /s/ Theo Melas-Kyriazi
                                        -----------------------------------
                                   Name:     Theo Melas-Kyriazi
                                   Title:    Vice President and Chief
                                             Financial Officer

                                   TTT ACQUISITION CORPORATION



                                   By:  /s/ Theo Melas-Kyriazi
                                        -----------------------------------
                                   Name:     Theo Melas-Kyriazi
                                   Title:    president


                                   THERMO TERRATECH INC.



                                   By:  /s/ Kenneth J. Apicerno
                                        -----------------------------------
                                   Name:     Kenneth J. Apicerno
                                   Title:    Treasurer





                                       29


<PAGE>

                                                                       EXHIBIT A
                                                                      ----------

                                                         H&D Draft of 10/18/99

                                                [Hale and Dorr LLP letterhead]




                                   October ___, 1999


Thermo Electron Corporation
81 Wyman Street
Waltham, MA 02454

Thermo TerraTech Inc.
85 First Avenue
Waltham, MA 02451

Re:   Merger Pursuant to Agreement and Plan of Merger by and Among
      Thermo Electron Corporation, TTT Acquisition Corporation, and Thermo
     TerraTech Inc.

Ladies and Gentlemen:

     This opinion is being  delivered to you in connection  with the filing of a
registration  statement  (the  "Registration  Statement")  on  Form  S-4,  which
includes the Joint Proxy Statement and Prospectus  relating to the Agreement and
Plan of Merger dated as of October [__], 1999 (the "Merger  Agreement"),  by and
among Thermo Electron  Corporation,  a Delaware corporation ("Thermo Electron"),
TTT Acquisition Corporation,  a Delaware corporation and wholly owned subsidiary
of Thermo  Electron  ("Merger  Sub"),  and  Thermo  TerraTech  Inc.,  a Delaware
corporation  ("TerraTech").  Pursuant to the Merger  Agreement,  Merger Sub will
merge with and into  TerraTech  (the  "Merger").  Except as otherwise  provided,
capitalized  terms not defined  herein have the meanings set forth in the Merger
Agreement and the exhibits thereto or in the letters  delivered to Hale and Dorr
LLP by Thermo  Electron and  TerraTech  containing  certain  representations  of
Thermo  Electron and  TerraTech  relevant to this  opinion (the  "Representation
Letters"). All section references, unless otherwise indicated, are to the United
States Internal Revenue Code of 1986, as amended (the "Code").

     In our  capacity  as  counsel to Thermo  Electron  in the  Merger,  and for
purposes  of  rendering  this  opinion,  we have  examined  and relied  upon the
Registration  Statement,  the Merger  Agreement  and the exhibits  thereto,  the
Representation  Letters,  and such other documents as we considered  relevant to
our analysis. In our examination of documents,  we have assumed the authenticity
of original  documents,  the accuracy of copies,  the genuineness of signatures,
and the legal capacity of signatories

<PAGE>


Thermo Electron Corporation
Thermo TerraTech Inc.
October ___, 1999
Page 2


     We have assumed that all parties to the Merger  Agreement  and to any other
documents  examined by us have acted, and will act, in accordance with the terms
of such Merger  Agreement and documents and that the Merger will be  consummated
at the  Effective  Time  pursuant to the terms and  conditions  set forth in the
Merger  Agreement  without  the  waiver or  modification  of any such  terms and
conditions.  Furthermore,  we have assumed that all representations contained in
the  Merger  Agreement,  as  well  as  those  representations  contained  in the
Representation  Letters,  are,  and at the  Effective  Time  will  be,  true and
complete in all material respects,  and that any  representation  made in any of
the  documents  referred to herein "to the best of the knowledge and belief" (or
similar   qualification)  of  any  person  or  party  is  correct  without  such
qualification. We have also assumed that as to all matters for which a person or
entity has  represented  that such  person or entity is not a party to, does not
have,  or is not aware of, any plan,  intention,  understanding,  or  agreement,
there is no such  plan,  intention,  understanding,  or  agreement.  We have not
attempted to verify independently such representations, but in the course of our
representation,  nothing  has  come to our  attention  that  would  cause  us to
question the accuracy thereof.

     The conclusions  expressed  herein  represent our judgment as to the proper
treatment  of certain  aspects  of the  Merger  under the income tax laws of the
United States based upon the Code, Treasury  Regulations,  case law, and rulings
and other  pronouncements  of the  Internal  Revenue  Service  (the "IRS") as in
effect on the date of this opinion.  No  assurances  can be given that such laws
will not be amended or otherwise  changed prior to the Effective Time, or at any
other  time,  or that such  changes  will not affect the  conclusions  expressed
herein.  Nevertheless,  we  undertake  no  responsibility  to advise you or your
shareholders of any developments  after the Effective Time in the application or
interpretation of the income tax laws of the United States.

     Our opinion  represents  our best  judgment of how a court would  decide if
presented  with the issues  addressed  herein and is not binding upon either the
IRS or any court.  Thus,  no  assurances  can be given that a position  taken in
reliance  on our  opinion  will not be  challenged  by the IRS or  rejected by a
court.

     This opinion  addresses only the specific  United States federal income tax
consequences  of the  Merger set forth  below,  and does not  address  any other
federal, state, local, or foreign income, estate, gift, transfer, sales, use, or
other tax consequences  that may result from the Merger or any other transaction
(including any transaction undertaken in connection with the Merger). We express
no opinion  regarding  the tax  consequences  of the Merger to  shareholders  of
TerraTech that are subject to special tax rules (including  insurance companies,
tax-exempt  organizations,   financial  institutions,   broker-dealers,  foreign
persons,  stockholders  who own  their  stock  as part of a  hedge,  appreciated
financial position, straddle or conversion transaction,  stockholders who do not


<PAGE>

Thermo  Electron Corporation
Thermo TerraTech Inc.
October ___, 1999
Page 3


own their stock as a capital  asset and  stockholders  who have  acquired  their
stock upon the exercise of employee options or otherwise as  compensation),  and
we express no opinion  regarding the tax  consequences  of the Merger arising in
connection with the ownership of options or warrants for TerraTech stock.

      On the basis of, and subject to, the  foregoing,  and in reliance upon the
representations  and  assumptions  described  above,  we are  of  the  following
opinion:

     1. The Merger  will  constitute  a  reorganization  within  the  meaning of
Section 368(a);

     2. No gain or loss will be  recognized by Thermo  Electron,  Merger Sub, or
TerraTech as a result of the Merger;

     3. No gain or loss will be recognized by the shareholders of TerraTech upon
the exchange of TerraTech  stock solely for shares of Thermo  Electron  stock in
the Merger;

     4. Cash  received by the  shareholders  of TerraTech in lieu of  fractional
shares of Thermo Electron stock will be treated as received as a distribution in
redemption of such fractional shares,  subject to the provisions of Section 302,
as if such fractional  shares had been issued in the Merger and then redeemed by
Thermo Electron;

     5. The tax basis of the shares of Thermo  Electron  stock  received  by the
shareholders  of  TerraTech  in the Merger will be equal to the tax basis of the
shares of TerraTech stock exchanged therefor in the Merger, reduced by any basis
allocable  to a fractional  share of Thermo  Electron  stock  treated as sold or
exchanged under Section 302; and

     6. The holding  period for the shares of Thermo  Electron stock received by
the  shareholders of TerraTech will include the holding period for the shares of
TerraTech  stock exchanged  therefor in the Merger,  provided that the shares of
TerraTech stock are held as capital assets at the Effective Time.

     No opinion is expressed  as to any federal  income tax  consequence  of the
Merger  except as  specifically  set forth  herein,  and this opinion may not be
relied upon  except  with  respect to the  consequences  specifically  discussed
herein.


<PAGE>

Thermo Electron Corporation
Thermo TerraTech Inc.
October ___, 1999
Page 4


     This opinion is intended  solely for the purpose of inclusion as an exhibit
to the Registration  Statement.  It may not be relied upon for any other purpose
or by any other person or entity, other than you and your shareholders,  and may
not be made  available to any other person or entity  without our prior  written
consent.  We hereby  consent to the filing of this  opinion as an exhibit to the
Registration  Statement  and  further  consent  to the  use of our  name  in the
Registration Statement in connection with references to this opinion and the tax
consequences of the Merger.  In giving this consent,  however,  we do not hereby
admit that we are in the  category of persons  whose  consent is required  under
Section 7 of the Securities Act of 1933, as amended.

                                   Very truly yours,



                                   HALE AND DORR LLP







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