Exhibit 10.27
 EXECUTION COPY
 THIRD AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT  AND WAIVER
      Section 1.01 Section 2.04(b) Section 2.09(c) Section 6.11 Section 6.16 Section 1.02 Section
3.05(a) Section 5.04(a) (b) (c) Section 5.07 Section 5.04(d)




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Amendment of Section 1.01 of the Credit Agreement Section
6 Section 1.01
 Amendment of Section 2.04(b) of the Credit Agreement Section 2.04(b)
 Amendment of Section 2.09(c) of the Credit Agreement Section 2.09(c) provided
 Amendment of Section 6.11 of the Credit Agreement Section
6 Section 6.11
 Minimum EBITDA
  Measurement Date
    
    Minimum EBITDAJune 30, 2008
    
    $33,000,000September 30, 2008
    
    $40,000,000December 31, 2008
    
    $41,000,000March 31, 2009
    
    $39,000,000June 30, 2009
    
    $42,500,000September 30, 2009
    
    $42,500,000December 31, 2009
    
    $46,000,000March 31, 2010
    
    $50,000,000June 30, 2010
    
    $27,500,000September 30, 2010
    
    $24,500,000December 31, 2010
    
    $60,000,000March 31, 2011
    
    $60,000,000
  2




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Section 6.11 Section 1.01
 Amendment of Section 6.16 of the Credit Agreement Section
6 Section 6.16 provided, however
 Effectiveness of Amendment of Sections 1.01, 6.11 and 6.16 of the Credit
Agreement Section 7 Section 7(d) Section 6.11 Section 1.01 Section 6.16
 Conditions Precedent
      3




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4




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Representations and Warranties Section 13
 Survival of Representations and Warranties
 Reference to Agreement
 Governing Law
 Execution
 Waivers
 Section 1.02
 Section
3.05(a)
 Sections
5.04(a) (b) (c)
  5




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Section 5.04(d)
 Section 5.07
 Limited Effect
 Ratification by Subsidiary Guarantors Section 15
 Agreement of Administrative Agent to Extend the Maturity Date Section 6
 Payment of Legal Fees
 signature pages follow
  6




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RENTECH ENERGY MIDWEST CORPORATION,
as BorrowerBy:
    /s/ Dan J. CohrsName:
    Dan J. CohrsTitle:
    VP and TreasurerRENTECH, INC.,
as HoldingsBy:
    /s/ Dan J. CohrsName:
    Dan J. CohrsTitle:
    EVP & CFO




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CREDIT SUISSE, CAYMAN ISLANDS BRANCH,
as Administrative Agent and Collateral AgentBy:
    /s/ Nupur KumarName:
    Nupur KumarTitle:
    Vice PresidentBy:
    /s/ Kevin BuddhdewName:
    Kevin BuddhdewTitle:
    AssociateCREDIT SUISSE LOAN FUNDING LLC,
as LenderBy:
    /s/ Robert HealeyName:
    Robert HealeyTitle:
    DirectorBy:
    /s/ Michael WotanowskiName:
    Michael WotanowskiTitle:
    DirectorBLT II LLC,
as LenderBy:
    /s/ Robert HealeyName:
    Robert HealeyTitle:
    Authorized SignatoryCREDIT SUISSE, CAYMAN ISLANDS BRANCH,
as LenderBy:
    /s/ Robert HealeyName:
    Robert HealeyTitle:
    DirectorBy:
    /s/ Michael WotanowskiName:
    Michael WotanowskiTitle:
    Authorized Signatory




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SOLUS CORE OPPORTUNITY MASTER FUND LTD.,
as LenderBy:
    /s/ Chris BondyName:
    Chris BondyTitle:
    Attorney-in-Fact




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Section 15
 RENTECH DEVELOPMENT CORPORATION,
as Subsidiary GuarantorBy:
    /s/ Dan J. CohrsName:
    Dan J. CohrsTitle:
    EVP and TreasurerRENTECH SERVICES CORPORATION,
as Subsidiary GuarantorBy:
    /s/ Dan J. CohrsName:
    Dan J. CohrsTitle:
    EVP and TreasurerRENTECH ENERGY TECHNOLOGY CENTER, LLC,
as Subsidiary GuarantorBy:
    /s/ Dan J. CohrsName:
    Dan J. CohrsTitle:
    EVP and TreasurerRENTECH SILVAGAS LLC,
as Subsidiary GuarantorBy:
    /s/ Dan J. CohrsName:
    Dan J. CohrsTitle:
    EVP and TreasurerSILVAGAS CORPORATION,
as Subsidiary GuarantorBy:
    /s/ Dan J. CohrsName:
    Dan J. CohrsTitle:
    EVP and Treasurer