<ARTICLE>           5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMO
TERRATECH INC.'S QUARTERLY REPORT ON FORM 10-Q FOR THE PERIOD ENDED JULY 3, 1999
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>        1,000

                              
<PERIOD-TYPE>                                 3-MOS
<FISCAL-YEAR-END>                             APR-02-2000
<PERIOD-END>                                  JUL-03-1999
<CASH>                                                  2,529
<SECURITIES>                                                0
<RECEIVABLES>                                          63,777
<ALLOWANCES>                                            3,276
<INVENTORY>                                             1,733
<CURRENT-ASSETS>                                      131,469
<PP&E>                                                132,055
<DEPRECIATION>                                         60,106
<TOTAL-ASSETS>                                        307,560
<CURRENT-LIABILITIES>                                 110,306
<BONDS>                                               120,103
<PREFERRED-MANDATORY>                                       0
<PREFERRED>                                                 0
<COMMON>                                                1,958
<OTHER-SE>                                             46,978
<TOTAL-LIABILITY-AND-EQUITY>                          307,560
<SALES>                                                     0
<TOTAL-REVENUES>                                       75,908
<CGS>                                                       0
<TOTAL-COSTS>                                          60,214
<OTHER-EXPENSES>                                       54,197
<LOSS-PROVISION>                                            8
<INTEREST-EXPENSE>                                      2,139
<INCOME-PRETAX>                                       (51,292)
<INCOME-TAX>                                           (1,985)
<INCOME-CONTINUING>                                   (45,094)
<DISCONTINUED>                                              0
<EXTRAORDINARY>                                             0
<CHANGES>                                                   0
<NET-INCOME>                                          (45,094)
<EPS-BASIC>                                           (2.37)
<EPS-DILUTED>                                           (2.37)