EXHIBIT 10.16

                                                           Execution Counterpart

             HAZARDOUS MATERIALS UNDERTAKING AND unsecured INDEMNITY


     This  Hazardous   Materials   Undertaking  and  Unsecured  Indemnity  (this
"Indemnity") is executed by CALPINE  CORPORATION,  a Delaware  corporation  (the
"Indemnitor")  in favor of THE BANK OF NOVA SCOTIA,  a Canadian  chartered  bank
("Scotiabank"),  for itself and as agent for the commercial lending institutions
to each of the Credit Agreements (as defined below) (herein  collectively,  with
their  successors  and assigns,  the "Lenders";  the Agent,  all Issuers and the
Lenders  are  collectively  referred  to as  the  "Indemnified  Parties"),  with
reference to the following facts:

     A.  Indemnitor  is party to that  certain  (i) Credit  Agreement  (the "New
Credit  Agreement"),  dated as of March 8, 2002, among  Indemnitor,  the various
financial institutions as are or may become parties thereto  (collectively,  the
"New Lenders"), The Bank of Nova Scotia, and Bayerische Landesbank Girozentrale,
as lead arrangers and  bookrunners,  Salomon Smith Barney Inc. and Deutsche Banc
Alex. Brown Inc., as lead arrangers and bookrunners,  Bank of America,  National
Association,  and Credit Suisse First Boston, New York Branch, as lead arrangers
and  syndication  agents and TD  Securities  (USA) Inc.,  as lead  arranger  and
Scotiabank as joint  administrative  agent and funding agent,  and Citicorp USA,
Inc., as Joint  Administrative Agent and (ii) Second Amended and Restated Credit
Agreement (the  "Existing  Credit  Agreement",  and together with the New Credit
Agreement, the "Credit Agreements"), dated as of May 23, 2000, among Indemnitor,
the various  financial  institutions  as are or may become parties  thereto (the
"Existing  Lenders"),  Bayerische  Landesbank  Girozentrale,  as co-arranger and
syndication agent for the Existing Lenders and the Agent.

     B. The Loans, the Letters of Credit, the Guaranty and all other Obligations
owing  to any of the  Lenders  under  each of the  Credit  Agreements  are to be
secured  by,  among  other  things,  all of the  right,  title and  interest  of
Indemnitor  in the real  property  and  interests  comprising  the  Domestic Gas
Reserves and all fixtures, personal property and other improvements now existing
or to be constructed on any of such properties (such properties, descriptions of
which  are  attached  hereto as  Exhibit  A,  herein  collectively  called,  the
"Properties"), with respect to which Indemnitor has executed counterparts of the
Deed of Trust.

     C. Lenders are willing to make the Credit Extensions to Indemnitor upon the
terms and conditions set forth in the Credit  Agreements,  the Deed of Trust and
the  other  Loan  Documents  (collectively,  the "Loan  Documents")  only if the
Indemnified  Parties are  indemnified and held harmless with respect to any risk
that the Properties may now or in the future be in any way contaminated,  or its
use or value impacted by any Hazardous Materials, as defined below.

     D. It is a  condition  precedent  to the  making  of the  Term B Loans  and
issuance  of the  Letters of Credit that  Indemnitor  execute  and deliver  this
Indemnity.

     E. In order to induce  the Agent and the  Lenders  to make the Loans and to
issue or cause to be issued the Letters of Credit,  and with the full  intention
and




understanding  that  the  Indemnified  Parties  will  rely  hereon,   Indemnitor
represents, warrants, covenants and agrees as follows:

     1. Certain  Definitions.  As used in this  Indemnity,  the following  terms
shall have the following respective meanings:

     "Hazardous  Materials"  means  crude or refined  oil or  fraction  thereof,
petroleum  substances,   petrochemical   products,   PCBs,  asbestos,   asbestos
containing   materials,   urea  formaldehyde,   salts,   flammable   explosives,
radioactive   materials,   hazardous  wastes,  toxic,  mutagenic  or  pathogenic
substances or related materials,  including,  without limitation, any substances
defined as or included in the definition of "hazardous  substances,"  "hazardous
wastes,"  "hazardous  materials,"  or "toxic  substances"  under any  applicable
federal or state laws or regulations.

     "Hazardous  Materials  Laws"  means  all  federal,  state  or  local  laws,
ordinances,   regulations,   orders  and  directives   pertaining  to  Hazardous
Materials.

     Capitalized  terms used and not  otherwise  defined  herein  shall have the
respective  meanings specified in either or both of the New Credit Agreement and
the Existing Credit Agreement, as context requires.

     2.  Representations and Warranties.  Without limiting the generality of any
of the  representations  or  warranties  contained in the other Loan  Documents,
Indemnitor hereby represents and warrants to the Agent and the other Indemnified
Parties  that,  except as disclosed on Exhibit B hereto,  as of the date of this
Indemnity and continuing thereafter,

          (a) the Properties and each portion thereof  (including the underlying
     groundwater)  are not and have  not  been a site  for the use,  generation,
     manufacture, discharge, assembly, processing, storage, release, disposal or
     transportation to or from of any Hazardous Materials,  except in connection
     with the production,  storage and transportation of crude oil, natural gas,
     other  hydrocarbons  and  petroleum,  and other  petroleum  products in the
     ordinary course of Indemnitor's business;

          (b) the Properties and each portion thereof  (including the underlying
     groundwater) are presently in compliance in all material  respects with all
     Hazardous Materials Laws, including,  without limitation, those relating to
     exposure to Hazardous Materials,  the labeling,  storage and containment of
     Hazardous Materials, and air, soil and surface and ground water conditions;

          (c)  there  have  been no  past,  and  there  are no  pending  or,  to
     Indemnitor's knowledge, threatened

               (i)  claims,  complaints,  notices or  requests  for  information
          received by  Indemnitor  with respect to any alleged  violation of any
          Environmental Law, including Hazardous Materials Laws, that, singly or
          in


                                      -2-


          the  aggregate,  may  reasonably  be  expected to result in a Material
          Adverse Effect, or

               (ii)  complaints,  notices or inquiries to  Indemnitor  regarding
          potential  liability under any Environmental Law, including  Hazardous
          Materials Laws,  that,  singly or in the aggregate,  may reasonably be
          expected to result in a Material Adverse Effect;

          (d) there have been no  unremediated  Releases of Hazardous  Materials
     at, on or under any property  (including the  Properties) now or previously
     owned or leased by Indemnitor that, singly or in the aggregate,  result in,
     or may reasonably be expected to result in, a Material Adverse Effect;

          (e) Indemnitor has been issued and is in material  compliance with all
     permits,   certificates,   approvals,   licenses  and  other   governmental
     authorizations  relating to  environmental  matters and  necessary  for its
     businesses;

          (f) no property  (including the Properties) now or previously owned or
     leased by  Indemnitor  is listed or proposed for listing  (with  respect to
     owned property only) on the National Priorities List pursuant to CERCLA, on
     the CERCLIS or on any similar state list of sites  requiring  investigation
     or clean-up;

(g)  Indemnitor  has not  directly  transported  or  directly  arranged  for the
     transportation of any Hazardous Material to any location which is listed or
     proposed for listing on the National Priorities List pursuant to CERCLA, on
     the  CERCLIS  or on any  similar  state  list or  which is the  subject  of
     federal,  state or local enforcement actions or other  investigations which
     may lead to material  claims  against  Indemnitor  for any  remedial  work,
     damage to natural  resources  or personal  injury,  including  claims under
     CERCLA;

          (h) there are no polychlorinated biphenyls or friable asbestos present
     at any property  (including  the  Properties)  now or  previously  owned or
     leased by Indemnitor  that,  singly or in the aggregate,  result in, or may
     reasonably be expected to result in, a Material Adverse Effect;

          (i) no conditions  exist at, on or under any property  (including  the
     Properties) now or previously owned or leased by Indemnitor which, with the
     passage  of time,  or the  giving  of notice  or both,  would  give rise to
     liability under any Environmental  Law, which liability would reasonably be
     expected to result in a Material Adverse Effect; and

          (j) to the best of the  knowledge of  Indemnitor,  no property  owned,
     operated or leased by  Indemnitor  is located  within two thousand  (2,000)
     feet of a significant  disposal of "hazardous  waste" within the meaning of
     Section 25221 of the California Health and Safety Code.


                                      -3-


     3. Covenants.  Indemnitor  hereby covenants and agrees that, so long as any
obligation  under any of the Loan Documents or otherwise in connection  with the
Loans is outstanding:

          (a)  Indemnitor  shall not permit the Properties or any portion of any
     parcel  thereof  to  be  a  site  for  the  use,  generation,  manufacture,
     discharge,   assembly,   processing,    storage,   Release,   disposal   or
     transportation to or from of Hazardous Materials except (i) as disclosed on
     Exhibit B hereto,  (ii) in such  quantities and as may be necessary for the
     production,  storage and transportation of crude oil, natural gas and other
     Hydrocarbons  (as defined in the Deed of Trust) in the  ordinary  course of
     Indemnitor's  business  as  conducted  on  the  Effective  Date,  (iii)  as
     necessary or required to develop the  Properties in the ordinary  course of
     Indemnitor's  business  and  (iv) as may be  necessary  to  respond  to any
     emergency,  each of which excepted activities will be conducted in a manner
     designed to minimize environmental risk;

          (b) Indemnitor shall keep and maintain the Properties and each portion
     of any parcel  thereof in  compliance  in all  material  respects  with all
     Environmental  Laws,  including Hazardous Materials Laws (and to the extent
     there are  violations of such laws existing as of the date hereof which are
     disclosed on Exhibit B, with the remediation plans and work plans listed on
     Exhibit B), and otherwise  shall not cause or permit the  Properties or any
     portion of any parcel thereof to be in violation,  in any material respect,
     of such laws;

          (c) As to any claim or matter not  disclosed on Exhibit B,  Indemnitor
     shall immediately advise the Agent in writing of:

               (i)  any  and  all   enforcement,   cleanup,   removal  or  other
          governmental or regulatory actions instituted, completed or threatened
          against  Indemnitor  or the  Properties  pursuant  to  any  applicable
          Environmental Laws, including Hazardous Materials Laws that, singly or
          in the  aggregate,  have,  or may  reasonably  be expected to have,  a
          Material Adverse Effect;

               (ii) any and all material  claims made or threatened by any third
          party  against  Indemnitor  or the  Properties  relating to any claim,
          liability,   cause  of  action,   nuisance,   fine,  penalty,  charge,
          administrative  or judicial  order or proceeding,  judgment,  remedial
          action or cleanup requirement, enforcement, damage, contribution, cost
          recovery,  compensation,  loss or injury  resulting from any Hazardous
          Materials that, singly or in the aggregate, have, or may reasonably be
          expected to have, a Material  Adverse Effect (the matters set forth in
          Sections  3(c)(i)  and (ii)  hereof  are  hereinafter  referred  to as
          "Hazardous Materials Claims");

               (iii) any  change in any claim or matter  disclosed  in Exhibit B
          that, singly or in the aggregate,  have, or may reasonably be expected
          to have, a Material Adverse Effect; and


                                      -4-


               (iv) Indemnitor's discovery of any occurrence or condition on any
          real  property  adjoining  or in the vicinity of the  Properties  that
          could cause the  Properties  or any part thereof to be  classified  as
          "border-zone  property" under the provisions of California  Health and
          Safety Code,  Sections  25220,  et seq., or any regulation  adopted in
          accordance  therewith,  or to be otherwise subject to any restrictions
          on the ownership, occupancy,  transferability or use of the Properties
          under any Environmental Law, including  Hazardous  Materials Laws. For
          the  purpose  of  protecting  the  collateral   given  to  secure  the
          Obligations,  the Agent  shall have the right to join and  participate
          in, as a party if it so  elects,  any  legal  proceedings  or  actions
          initiated in  connection  with any Hazardous  Materials  Claims and to
          have  its  reasonable  attorneys'  fees  and  expenses  in  connection
          therewith paid by Indemnitor;

          (d) Indemnitor  shall not,  without the Agent's prior written  consent
     (which  consent shall not be  unreasonably  withheld or delayed),  take any
     remedial action in response to the presence of any Hazardous  Materials on,
     under,  or about the  Properties  (except (i) with  respect to oil, gas and
     other  Hydrocarbons,  in the ordinary course of Indemnitor's  business,  or
     (ii) as may be necessary to respond to any  emergency),  nor enter into any
     settlement agreement, consent decree, or other compromise in respect of any
     Hazardous Material Claim in excess of $250,000;

          (e) Annually,  at the time Indemnitor's  audited financial  statements
     are  required  to  be  delivered  to  the  Agent  pursuant  to  the  Credit
     Agreements,  Indemnitor  shall  deliver  to the  Agent a report  discussing
     significant  issues or  concerns  arising,  or measures  taken,  during the
     preceding  year and those  contemplated  for the following year relating to
     compliance with Hazardous Materials Laws and Environmental Laws, including,
     without  limitation,  compliance  with  any  then  effective  order  of the
     Regional Water Quality  Control Board (or other lead agency)  pertaining to
     the  characterization,  abatement and  remediation of soil and  groundwater
     contamination of the Properties;

          (f) To the extent that  Indemnitor has the right to do so,  Indemnitor
     shall  permit  the  Agent  or  its  agents,  at the  cost  and  expense  of
     Indemnitor,  to enter upon the Properties  and all parts  thereof,  for the
     purpose  of  investigating  and  inspecting  the  condition  and  operation
     thereof,  and shall permit reasonable access to the field offices and other
     offices,  including  the  principal  place of business,  of  Indemnitor  to
     inspect and examine the Properties and to inspect,  review and reproduce as
     necessary any books,  records,  accounts,  contracts or other  documents of
     Indemnitor;

          (g) Without  limiting the generality of the foregoing  clause (f), the
     Agent  shall  have  the  right,   subject  to  any   existing   contractual
     restrictions  binding on  Indemnitor  and on  twenty-four  (24) hours prior
     notice to  Indemnitor,  to cause such persons and entities as the Agent may
     designate  to enter the  Properties  to conduct (at the cost and expense of
     Indemnitor), or to cause Indemnitor to


                                      -5-


     conduct  (at  the  cost  and  expense  of   Indemnitor),   such  tests  and
     investigations  as the Agent  deems  necessary  to  determine  whether  any
     hazardous substance or solid waste is being generated, transported, stored,
     or disposed of in accordance with applicable Environmental Laws. Such tests
     and investigations may include,  without limitation,  underground  borings,
     ground water  analyses  and borings from the floors,  ceilings and walls of
     any improvements located on the Properties.  This Section 3(g) shall not be
     construed  to affect or limit the  obligations  of  Indemnitor  pursuant to
     Section 4 hereof;

          (h) The Agent shall have no duty to visit or observe the Properties or
     to conduct  tests,  and no site visit,  observation or testing by the Agent
     shall impose any liability on the Agent,  nor shall Indemnitor or any other
     Obligor be  entitled  to rely on any visit,  observation  or testing by the
     Agent in any  respect.  The  Agent  may,  in its  discretion,  disclose  to
     Indemnitor or any other  Person,  including any  governmental  agency,  any
     report or finding  made as a result  of, or in  connection  with,  any site
     visit,  observation  or testing by the Agent.  Indemnitor  agrees  that the
     Agent  makes no  warranty  or  representation  to  Indemnitor  or any other
     Obligor regarding the truth, accuracy or completeness of any such report or
     findings  that may be so  disclosed.  Indemnitor  also  acknowledges  that,
     depending upon the results of any site visit, observation or testing by the
     Agent and disclosed to Indemnitor,  Indemnitor may have a legal  obligation
     to notify one or more  governmental  agencies  of such  results,  that such
     reporting  requirements  are  site-specific,  and  are to be  evaluated  by
     Indemnitor without advice or assistance from the Agent; and

          (i) Cooperate fully with any environmental  consultant retained by the
     Agent to prepare reports on the Properties.

     4. Continuing,  Unsecured Indemnity. Indemnitor hereby agrees to indemnify,
hold harmless and defend (by one law firm  reasonably  satisfactory to the Agent
unless an Event of Default shall have occurred and be continuing)  the Agent and
the other Indemnified Parties and its and their directors,  officers, employees,
agents,  successors and assigns  (collectively,  "Indemnitees") from and against
any and all claims (including without limitation third party claims for personal
injury or real or  personal  property  damage),  losses,  damages,  liabilities,
fines,  penalties,  charges,  administrative and judicial proceedings (including
informal  proceedings)  and orders,  judgments,  remedial  action  requirements,
enforcement  actions  of any  kind,  and all  costs  and  expenses  incurred  in
connection therewith (including but not limited to reasonable  attorneys' and/or
paralegals'  fees and  expenses),  including,  but not  limited  to,  all  costs
incurred in connection with any  investigation  or monitoring of site conditions
or any clean-up,  remedial, removal or restoration work by any federal, state or
local government  agency,  arising directly or indirectly,  in whole or in part,
out of (i) the presence on or under the  Properties of any Hazardous  Materials,
or any escape, seepage, leakage, spillage, discharge, emission or Release of any
Hazardous  Materials  on,  under or from the  Properties,  or (ii) any  activity
carried on or  undertaken on or off the  Properties,  whether prior to or during
the term of the Loans,  and whether by Indemnitor or any predecessor in title or
any employees, agents, contractors or


                                      -6-


subcontractors  of Indemnitor or any  predecessor in title, or any third persons
at any time  occupying  or present on the  Properties,  in  connection  with the
handling, treatment, removal, storage,  decontamination,  clean-up, transport or
disposal of any Hazardous  Materials  that at any time are located or present on
or under or that at any time  migrate,  flow,  percolate,  diffuse or in any way
move onto or under the Properties;  provided however,  that nothing herein shall
require  Indemnitor to indemnify  Indemnitees for any matter arising solely from
the gross negligence or wilful misconduct of the Agent. The foregoing  indemnity
shall further apply to any residual contamination on or under the Properties, or
affecting any natural  resources,  and to any  contamination  of any property or
natural  resources  arising in connection  with the generation,  use,  handling,
storage, transport or disposal of any such Hazardous Materials, and irrespective
of whether any of such  activities were or will be undertaken in accordance with
applicable  laws,   regulations,   codes  and  ordinances.   Indemnitor   hereby
acknowledges  and agrees that the obligations of Indemnitor under this Indemnity
shall be  unlimited  personal  obligations  and also shall NOT be secured by the
Deed of Trust. In this regard,  Agent's appraisal of the value of the Properties
is such that Agent is not willing to accept the consequences, under California's
"one form of action" rule (i.e., Section 726 of the Code of Civil Procedure) and
"Anti-Deficiency Rules" (i.e., Sections 580(a), 580(b) and 580(d) of the Code of
Civil Procedure) of inclusion of the obligations  under this Indemnity among the
obligations  secured  by the Deed of  Trust,  and that the  Agent  and the other
Indemnified  Parties would not make the Loans or issue or cause to be issued the
Letters  of  Credit in the  absence  of the  personal  liability  undertaken  by
Indemnitor for these obligations. It is expressly understood and agreed that the
indemnity provided for herein shall survive:  (i) the repayment of the Loans and
the release of or  reconveyance  (whether full or partial) of the Deed of Trust;
or (ii) the  acquisition of title to all or any portion of the Properties by the
Agent,  or any successor in interest to the Agent, or any nominee or designee of
any of them, by foreclosure under or transfer in lieu of foreclosure of the Deed
of Trust,  whether or not the same is otherwise in  satisfaction of Indemnitor's
obligations in connection with the Loan.

     5. Time of the Essence. Time is of the essence of this Indemnity.

     6.  Governing  Law.  This  Indemnity  shall be governed by,  construed  and
enforced in accordance  with the laws of the State of California.  In any action
brought under or arising out of this  Indemnity,  Indemnitor  hereby consents to
the  jurisdiction  of any  competent  court within the State of  California  and
consents to service of process by any means authorized by California law.

     7. Indemnitor  Waivers.  Indemnitor  waives: (a) any defense based upon any
legal  disability  to enter  into the  Credit  Agreements  or other  defense  of
Indemnitor  under the Credit  Agreements;  (b) any defense  based on any lack of
authority of the officers, directors, partners or agents acting or purporting to
act on behalf of Indemnitor or any principal of Indemnitor, or any defect in the
formation of Indemnitor or any  principal of  Indemnitor;  (c) any defense based
upon the  application  of the proceeds of the Loans by  Indemnitor  for purposes
other than the purposes  represented  by  Indemnitor to the Agent or intended or
understood by Agent or Indemnitor;  (d) any and all rights and defenses  arising
out of an election of remedies by Agent, even though that


                                      -7-


election of remedies, such as a nonjudicial foreclosure with respect to security
for a guaranteed  obligation,  has destroyed  Indemnitor's rights of subrogation
and  reimbursement  against the principal by the operation of Section  580(d) of
the California Code of Civil Procedure or otherwise;  (e) any defense based upon
Agent's  election,  in any proceeding  instituted  under the Federal  Bankruptcy
Code, of the application of Section 111(b)(2) of the Federal  Bankruptcy Code or
any successor statute;  (f) any defense based upon any borrowing or any grant of
security  interest  under  Section  364  of the  Federal  Bankruptcy  Code;  (g)
presentment,  demand, protest and notice of any kind; and (h) the benefit of any
statute of  limitations  affecting the liability of Indemnitor  hereunder or the
enforcement  hereof.  Indemnitor  further waives any and all rights and defenses
that Indemnitor may have because  Indemnitor's debt is secured by real property;
this means,  among other  things,  that:  (1) Agent may collect from  Indemnitor
without  first   foreclosing  on  any  real  or  personal  property  pledged  by
Indemnitor;  (2) if Agent forecloses on any real property  collateral pledged by
Indemnitor,  then the  amount of the debt may be  reduced  only by the price for
which that collateral is sold at the foreclosure sale, even if the collateral is
worth more than the sale price. The foregoing  sentence is an unconditional  and
irrevocable  waiver of any rights and defenses  Indemnitor  may have because its
debt is secured by real  property.  These  rights and  defenses  being waived by
Indemnitor  include,  but are not limited to, any rights or defenses  based upon
Section 580(a), 580(b), 580(d) or 726 of the California Code of Civil Procedure.

     8. Other Provisions.

          (a) This  Indemnity is a Loan  Document  executed  pursuant to the New
     Credit  Agreement  and shall be  construed,  administered  and  applied  in
     accordance with the terms and provisions  thereof  (including  [Article XI]
     thereof).

          (b) All notices  pursuant to this Indemnity  shall be delivered at the
     times,  in the manner and to the addressees as set forth in Section 11.2 of
     each of the Credit Agreements.

          (c) No amendment to or waiver of any  provision of this  Indemnity nor
     consent to any departure by Indemnitor  herefrom shall be effective  unless
     the same shall be in writing and signed by the Agent and Indemnitor.

          (d) This  Indemnity  shall be binding on and for the  benefit  of, the
     parties hereto, together with their respective successors and assigns.

          (e)  The  obligations  of  Indemnitor   hereunder  shall  survive  any
     termination of this Indemnity and the  termination of all the  Commitments.
     The  representations  and  warranties  made by Indemnitor in this Agreement
     shall survive the execution and delivery of this Indemnity.

          (f)  Any   provision  of  this   Indemnity   which  is  prohibited  or
     unenforceable  in any  jurisdiction  shall,  as to such  provision and such
     jurisdiction,   be  ineffective  to  the  extent  of  such  prohibition  or
     unenforceability without invalidating the


                                      -8-


     remaining  provisions  of this  Indemnity  or  affecting  the  validity  or
     enforceability of such provision in any other jurisdiction.

          (g)  The  various   headings  of  this   Indemnity  are  inserted  for
     convenience only and shall not affect the meaning or interpretation of this
     Indemnity or any provisions hereof.

          (h) This  Indemnity  may be executed by the parties  hereto in several
     counterparts,  each of which shall be deemed to be an  original  and all of
     which  shall  constitute  together  but one and the  same  agreement.  This
     Indemnity  shall become  effective  when  counterparts  hereof  executed on
     behalf of Indemnitor and the Agent shall have been received by the Agent.


                                      -9-




Dated:  as of May 9, 2002

                                       "Indemnitor"

                                       CALPINE CORPORATION, a Delaware
                                       corporation

                                       By:______________________________________
                                          Name:
                                          Title:


                                       "Agent"

                                       THE BANK OF NOVA SCOTIA, as Agent


                                       By_______________________________________
                                          Name:
                                          Title:________________________________







                                    EXHIBIT A
                                       to
             HAZARDOUS MATERIAL UNDERTAKING AND UNSECURED INDEMNITY
             ------------------------------------------------------

                         Legal Description of Properties






                                    EXHIBIT B
                                       to
             HAZARDOUS MATERIAL UNDERTAKING AND UNSECURED INDEMNITY
             ------------------------------------------------------

                            Description of Hazardous
                          Materials On Properties, etc.

                                      None