Document:

CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTIONS OF THIS DOCUMENT HAVE
BEEN REDACTED AND HAVE BEEN SEPARATELY FILED WITH THE COMMISSION.

                                                                  Exhibit 10.4.6

                           GEOTHERMAL RESOURCES LEASE

         THIS LEASE is entered into this 18th day of November, 1983, by and
between s SIERRA PACIFIC POWER COMPANY, a Nevada corporation ("Lessor"), and
GEOTHERMAL DEVELOPMENT ASSOCIATES, a Nevada corporation ("Lessee").

         1. INTEREST GRANTED:

               In consideration of the covenants and agreements contained
herein, Lessor hereby grants and leases to Lessee the exclusive right and
privilege to drill for, extract, produce, remove, utilize, sell, and dispose of
geothermal steam and associated geothermal resources as defined in NRS 322.005,
(hereinafter called "geothermal resources"), in or under that certain parcel of
property located in Washoe County, Nevada, and consisting of approximately
thirty (30) acres, as more particularly described in Exhibit "A," which is
attached hereto and incorporated herein by reference, together with:

               (a) The non-exclusive right to conduct within the leased area
               geological and geophysical exploration;

               (b) The right to construct or erect and to use, operate, and
               maintain within the leased area, together with ingress and egress
               thereupon, all wells, pumps, pipes, pipe lines, buildings,
               plants, sumps, brine pits, reservoirs, tanks, waterworks, pumping
               stations, roads, electric power generating plants, transmission
               lines, industrial facilities, electric telegraph or telephone
               lines, and such other works and structures and to use so much of
               the surface of the land as may be necessary or reasonably
               convenient for the production, utilization, and processing of
               geothermal resources or for the full enjoyment of the rights
               granted by this Lease, subject to applicable laws and
               regulations. Although the use of the leased area for an electric
               generating plant and/or transmission facilities is authorized
               hereunder, the location of such facilities and the terms of
               occupancy therefor shall be set forth in a separate agreement
               between the parties.

               (c) The non-exclusive right to drill potable water wells in
               accordance with Nevada statutory water laws within the leased
               area and to use the water produced therefrom for operation of the
               leased lands, free of costs, provided

               that such drilling and development are conducted in such a way
               that they do not interfere with Lessor's activities on the leased
               land.

               (d) The right, without the payment of royalties hereunder, to
               reinject into the leased lands geothermal resources and
               condensates to the extent that such resources and condensates are
               not utilized, but their reinjection is necessary for operation
               under this Lease in the recovery or processing of geothermal
               resources. If the Lessee, pursuant to a plan approved by the
               Nevada Division of Environmental Protection, disposes of the
               useable brine and waste products into underlying formations, it
               may do so without the payment of royalties.

               All of the activities described above shall be conducted for the
primary purpose of the generation of electrical power through the use of
geothermal resources. Nothing in this Lease shall be construed as prohibiting
the use, for other purposes, of spent geothermal resources produced on the
leased property.

         2. TERM:

               The term of this Lease shall commence upon the date of its
execution and subject to the conditions set forth below shall continue for a
term of twenty (20) years and for so long thereafter as geothermal resources are
produced or utilized in commercial quantities on the leased property, or lands
pooled or unitized therewith.

         3. RENTALS AND ROYALTIES:

               (a) Annual Rental. For each lease year prior to the commencement
               of production of geothermal resources in commercial quantities on
               the leased lands, the Lessee shall pay the Lessor on or before
               the anniversary date of the lease a rental of *** Dollars ($***)
               per acre or a fraction thereof. If no production of electrical
               energy has been achieved on the leased property by the end of the
               third year of the lease term, and the parties have not entered
               into a written agreement to extend the lease term, this Lease
               shall automatically terminate as to both parties.

               (b) After Lessee has commenced the production of electrical
               energy, Lessee may, at its option, suspend or defer such
               production. If Lessee does not then resume production within one
               year, Lessee shall pay rent for the year, in arrears, as
               described in Paragraph 3(a) hereinabove. If production is
               suspended

*** Confidential material redacted and filed separately with the Commission.

                                      -2-

               for more than eighteen (18) months at any one time, this
               agreement shall terminate automatically as to both parties.

               (c) Royalty. On or before the last day of the calendar month
               after the month of commencement of production in commercial
               quantities of geothermal resources and thereafter on a monthly
               basis, the Lessee shall pay to the Lessor:

                    (i) A royalty of ***

                    (ii) A royalty of ***

                    (iii) A royalty of ***, and utilized by Seller for the ***
               The value of said resource shall be considered ***

                    (iv) A royalty of ***. In the event Lessee elects to process
               ***, Lessor's royalty share shall bear its proportionate share of
               such ***. For the purpose of this Lease, the ***

         4. TAXES AND ASSESSMENTS:

               Lessee shall pay all taxes levied against its improvements on the
leased land. Lessor shall pay its royalty share, and Lessee shall pay the
remaining portion of any and all taxes assessed on geothermal resources from the
leased land in the following manner:

               (a) Commencing with the effective date of this Lease and prior to
               the actual production of geothermal resources, Lessor shall pay
               and bear its royalty share,

*** Confidential material redacted and filed separately with the Commission.

                                      -3-

               and Lessee shall pay and bear the remaining portion of any and
               all taxes attributable to an assessment of geothermal resources
               on said leased land.

               (b) After the commencement of production of geothermal resources
               from the leased land, Lessor shall pay its royalty share, and
               Lessee shall pay the remaining portion of any and all taxes
               assessed upon geothermal resources and also of all severance,
               production, license, and other taxes and assessments levied or
               assessed on account of the production of geothermal resources
               from the leased land.

               In the event Lessor's royalty share of such taxes exceeds
one-half of the amount of Lessor's rental shut-in royalty and/or royalty
payments hereunder for the year in which such taxes are payable, Lessee shall
advance such excess on Lessor's behalf and recoup such advance out of one-half
of Lessor's royalty income once commercial production has commenced on the
leased lands. Lessor shall pay before delinquency all other taxes and
assessments on the leased land and improvements. However, Lessee is hereby
authorized to pay any taxes and assessments on behalf of Lessor and may, if it
so desires, deduct the amounts so paid from royalties or monies due Lessor
hereunder.

         5. WELLS:

               (a) Lessee shall not drill or operate water wells or take water
               in such a way as to injure water wells, ponds or reservoirs of
               Lessor or interfere with or restrict the supply of water to
               Lessor or its tenants for domestic, livestock or agricultural
               use. If Lessee elects to permanently abandon any well drilled by
               Lessee or the leased land, Lessor shall have the option of
               requiring in writing that Lessee turn over such well to Lessor,
               and at that time Lessor shall pay Lessee for the salvage value of
               the material and equipment in and on said well. If Lessor so
               elects, Lessee agrees to plug such well at the bottom of the
               surface casing according to the requirements of the State
               Engineer in order to prevent contamination of freshwater bearing
               formations as a result of Lessee's drilling operations.

               (b) Subject to the terms of this Paragraph 5, within six (6)
               months after abandonment of any well, including those
               abandonments resulting from termination of this Lease, Lessee
               shall remove all machinery, material and

                                      -4-

               structures used in connection with said well and not used in its
               other operations, if any, on the leased land, and shall fill in
               and level off all excavations, pits, or other alterations to the
               surface of the leased land caused in connection with said well,
               and, insofar as practical, shall restore the leased land and the
               means of ingress and egress to as good a condition as existed
               when Lessee commenced operations under this Lease, except
               reasonable wear and tear, acts of nature and conditions beyond
               the control of Lessee.

         6. COMINGLING, POOLING AND UNITIZATION:

               (a) Lessee shall have the right to comingle (for purposes of
               storing, transporting, handling, utilizing, selling or
               processing) geothermal resources produced or extracted from the
               leased land and lands pooled, unitized or combined therewith,
               with similar substances produced or extracted from other lands or
               units. In the event of such comingling, Lessee shall meter, gauge
               or measure, according to prevalent industry standards, the
               production from the leased land, or from the unit or units
               including the leased land or other units or lands, as applicable,
               and compute and pay Lessor's royalty attributable to Lessor's
               land on the basis of such production as so determined or
               allocated.

               (b) Lessee may, as a recurring right for drilling, development or
               operating purposes, pool, unitize, or combine all or part of the
               leased land into a unit with any other land or lands (whether
               held by Lessee or others), whether or not adjacent or contiguous,
               which Lessee desires to develop or operate as a unit. Such a unit
               shall be officially created upon Lessee's filing in the official
               records of Washoe County a notice of such unitization, describing
               said unit. Any well (whether or not Lessee's well) commenced,
               drilled, drilling and/or producing or being capable of producing
               in any part of such unit shall for all purposes of this Lease be
               deemed a well commenced, drilled, drilling and/or producing on
               the leased land, and the Lessee shall have the same rights and
               obligations with respect thereto and the drilling and producing
               operations upon the lands from time to time included within any
               such unit as Lessee would have if such lands constituted the
               leased lands; provided, however, that

                                      -5-

               notwithstanding this or any other provision or provisions of this
               Lease to the contrary:

                    (i) Production as to which royalty is payable from any such
               well or wells drilled upon any such unit, whether located on the
               leased land or other lands, shall be allocated to the leased land
               in the proportion that the acreage of the leased land in such
               unit bears to the total acreage of such unit. Such allocated
               portion thereof shall for all purposes be considered as having
               been produced from the leased land, and the royalty payable under
               this Lease with respect to the leased land in such unit shall be
               payable only upon that proportion of production so allocated, and

                    (ii) If taxes of any kind are levied or assessed (other than
               taxes on the surface and on Lessor's improvements), any portion
               of which is chargeable to Lessor under the provisions of this
               Lease, then this share of such taxes to be borne by Lessor shall
               be in proportion to the share of the production from such unit
               allocated to the leased land.

         7. RESERVATIONS TO LESSOR:

               All rights in the leased area not granted to Lessee by this Lease
are hereby reserved to Lessor. Without limiting the generality of the foregoing,
such reserved rights include:

               (a) Disposal - the right to sell or otherwise dispose of the
               surface of the leased lands or any resource in the leased lands
               under existing laws, or laws hereinafter enacted, subject to the
               rights of the Lessee under this Lease.

               (b) Rights of Way - the right to authorize geological and
               geophysical explorations on the leased land which do not
               interfere with or endanger actual operations under this Lease and
               the right to grant such easements or rights of way for joint or
               several use upon, through, or in the leased area for steam lines
               and other public or private purposes which do not interfere with
               or endanger planned or actual operations or facilities
               constructed under this Lease.

               (c) Mineral Rights - the ownership of the right to extract
               minerals, oil, hydrocarbon gas, and helium from the leased lands.

                                      -6-

               (d) Casing - the right to acquire the well and casing at the fair
               market value of the casing where the Lessee finds only potable
               water, and such water is not required in lease operations.

               (e) Measurements - the right to measure geothermal resources and
               to sample any production thereof.

         8. DEFAULT AND TERMINATION:

               Whenever the Lessee fails to comply with any of the terms and
provisions of this Lease, and does not commence to remedy such failure within
ninety (90) days after receipt of written notice from Lessor, the Lessor may (a)
suspend operations until the requested action is taken to correct the
non-compliance, or (b) cancel this Lease by delivering written notice of its
intent to do so to Lessee. Such cancellation shall be effective immediately upon
delivery of said notice. The following property shall be excepted from any Lease
termination hereunder as a result of default: (a) each and any well then capable
of producing in commercial quantities the substances covered by this Lease, and
in respect to which Lessee is not in default; and (b) rights of way and
easements across lands subject to such Lease termination, which rights of way
and easements are necessary for conducting Lessee's operations on or in the
vicinity of the lands retained, including sites for electric generating units.

               Lessee may terminate this Lease at any time upon six (6) months
written notice to Lessor. During the six-month period, Lessee shall remove all
generation equipment and plant, treat all wells in accordance with the
appropriate provisions of Paragraph 5 above, and return the leased land to a
condition as near as possible to its state prior to Lessee's entry thereon.

         9. INDEMNIFICATION:

               The Lessee shall indemnity and hold harmless Lessor, its
officers, agents and employees from any and all claims for liability of any kind
arising from or connected with Lessee's activities and operations under this
Lease. Lessee shall pay to the person beneficially interested in the damaged
object all damages caused by Lessee's operations on the surface of the leased
land, including but not limited to damages to growing crops, pasture and
improvements on the leased land, or to animals or livestock. Lessee agrees to
take reasonable steps to prevent its operations from:

               (a) Causing or contributing to soil erosion, or to the injury to
               soil conserving structures on the leased land;

                                      -7-

               (b) Polluting the waters of reservoirs, springs, streams or water
               wells on the leased land;

               (c) Damaging crops or pasture, consistent with the purposes of
               this Lease; or

               (d) Harming or injuring in any way the animals or livestock owned
               by Lessor or his tenants, or kept or pastured on the leased land,
               including the erection and maintenance of fences, gates and
               cattle guards where necessary for such purposes.

               In no event shall Lessor be indemnified for liability or loss
resulting from its sole negligence.

         10. CONDEMNATION:

               Eminent domain proceedings resulting in the condemnation of a
part of the premises leased herein, but leaving the remaining premises
reasonably useable by Lessee for the purposes of the activities described in
Paragraph 1 above, will not terminate this Lease unless Lessor and Lessee
mutually agree to such termination. The effect of any such partial condemnation
will be to terminate the Lease as to the portion of the premises condemned, and
the Lease of the remainder of the premises shall remain intact. Lessee hereby
assigns and transfers to Lessor any claim it may have to compensation for
damages or award as a result of any condemnation, that does not materially
impair its ability to carry out the activities described in Paragraph 1.

         11. PERMITTING:

               Lessee shall obtain and maintain any and all permits, licenses,
and governmental approvals necessary for the conduct of Lessee's activities on
the leased land. All labor to be performed and material to be furnished in the
operations hereunder shall be at the sole cost and expense of Lessee, and Lessee
shall hold Lessor free and harmless from liability thereunder. Lessee shall keep
the leased premises fully protected against any and all liens of every character
arising from or connected with Lessee's operations hereunder.

         12. ASSIGNMENTS AND SUBLEASES:

               (a) Neither party shall voluntarily assign this Lease without the
               prior written consent of the other party, unless the assignment
               is to a partnership in which one of the parties to this Lease is
               a general partner.

                                      -8-

               (b) In the event that either party to this Lease wishes to assign
               this Lease to a corporation or other entity, which does not fall
               into subsection (a) above, said party shall provide the other
               party with written notice of such intent. Said written notice
               shall describe the financial structure and assets of the
               potential assignee in sufficient detail to permit the noticed
               party to evaluate the effect of the assignment on its interest in
               this Lease and the even-dated Agreement For the Purchase and Sale
               of Electricity executed by the parties hereto. The noticed party
               shall have thirty (30) days from its receipt of the notice to
               consent or refuse to consent to the assignment. Failure to give
               written consent or refusal within said thirty-day period shall be
               deemed consent by the noticed party. In no event shall consent to
               any assignment be unreasonably withheld.

               (c) In the event Lessee is contemplating an assignment such as
               described in subsection (b) above, Lessor shall have a prior
               right to regain Lessee's rights under the Lease, together with
               any and all related improvements, at the price and on the terms
               of the intended assignment. Lessor may exercise this right by
               notifying Lessee of its intent to do so by the end of the
               thirty-day period described in subsection (b) above. Such notice
               shall also be deemed a refusal of consent to the assignment of
               Lessee's rights to a third party.

               Subject to the provisions of this Paragraph, all obligations
hereunder shall be binding upon, and every benefit hereof shall inure to, the
heirs, executors, administrators, successors and assigns of the respective
parties hereto.

         13. NOTICES:

               Lessor may give any notice or deliver any document hereunder to
Lessee by mailing the same by registered mail addressed to Lessee at:

                           Geothermal Development Associates
                           251 Ralston Street
                           Reno, Nevada 89503

or by delivering the same in person to the above-referenced address Lessee.
Lessee may give any notice or deliver any document hereunder to Lessor by
mailing the same by registered mail addressed to Lessor at:

                           Sierra Pacific Power Company
                           Attention: Max Jones

                                      -9-

                           P.O. Box 10100
                           Reno, Nevada 89520

or by delivering the same to Lessor in person. For purposes of this Paragraph,
either party may change its address by written notice to the other. In case of
any notice or document delivered by registered mail, the same shall be deemed
delivered when deposited in any U.S. Post Office, properly addressed as herein
provided, with postage fully prepaid. Lessee may make any payment due Lessor to
Lessor personally or by mail at the address of Lessor given above.

         14. CONDITION:

               The obligations of both parties under this Lease are conditioned
upon the Public Service Commission of Nevada's approval of the pricing
provisions in the parties' even-dated Agreement for the Purchase and Sale of
Electricity as a portion of Lessor's purchased power costs. If such approval is
not received, this Lease shall be considered null and void.

///
///
///
///
///
///
///

               IN WITNESS WHEREOF, the parties hereto have executed this Lease
as of the day and year first above written.

                                             LESSOR:

                                             SIERRA PACIFIC POWER COMPANY

                                             By  /s/ Indecipherable
                                               ---------------------------------
                                             Title:  Sr. Vice President
                                                   -----------------------------

                                             LESSEE:

                                             GEOTHERMAL DEVELOPMENT
                                              ASSOCIATES

                                      -10-

                                             By  /s/ G. Martin Booths
                                               ---------------------------------
                                             Title: President
                                                    ----------------------------

                                      -11-

                               SECOND AMENDMENT TO
                           GEOTHERMAL RESOURCES LEASE

     THIS AGREEMENT is entered into as of the date of its execution by and
between SIERRA PACIFIC POWER COMPANY, A Nevada Corporation ("Lessor") and FAR
WEST HYDROELECTRIC FUND, LTD., a Utah Limited Partnership ("Lessee").

1. RECITALS. This Amendment is based on the following facts:

     a. On November 18, 1983, Lessor and Geothermal Development Associates
     entered into an Agreement for the Purchase and Sale of Electricity ("the
     Original Power Purchase Agreement") and a Geothermal Resources Lease ("the
     Lease") for a geothermal generation project to be located near Steamboat
     Springs, Nevada. The parties amended the Lease on January 7, 1985, and the
     Original Power Purchase Agreement on March 6, 1987. Both the Original Power
     Purchase Agreement, as amended, and the Lease, as amended, are currently in
     effect.

     b. Through a series of assignments, to which Lessor consented, Far West
     Hydroelectric Fund, Ltd. is the current Lessee under the Lease, as well as
     the Seller under the Original Power Purchase Agreement.

     c. Far West Capital, Inc. wishes to construct a geothermal generating
     facility which consists of a 2.0 MW gross (1.8 MW net) expansion at the
     Steamboat Project ("Plant") on the land subject to the Lease, the output of
     which will be sold to Lessor pursuant to a new Long-Term Agreement for the
     Purchase and Sale of Electricity of even date herewith ("the New Power
     Purchase Agreement"). Lessor and Lessee wish to amend the Lease to
     accommodate the Plant on the leased property and delineate a method of
     calculating royalty payments to be made by Lessee on the output of the
     Plant.

     d. Lessee intends to sublease a portion of the leased property to Far West
     Capital, Inc.

In consideration of these facts, the parties agree as follows:

2. AMENDED PROVISION. Section 3(c) (i) of the Lease is hereby amended to read as
follows:

                                       1

     3.(c) ROYALTY - At the end of the Billing Period during which the initial
     production of geothermal resources in commercial quantities from the Plant
     ("the Initial Operation") occurs and at the end of each monthly Billing
     Period thereafter, the Lessee shall pay Lessor royalties calculated as
     follows:

          (i) A royalty of *** percent (***%) on the ***, plant which is the
     subject of the Original Power Purchase Agreement.

          (ii) A royalty, calculated *** from the Plant for the previous Billing
     Period which is the subject of the New Power Purchase Agreement.

          (iii) A royalty of *** percent (***%) on the *** from any other power
     plant built upon or utilizing geothermal resources from the leased lands,
     or land pooled or unitized therewith.

      A "Billing Period" shall mean the time period between established meter
reading dates.

3. STATUS OF AMENDMENT. It is expressly understood and agreed by the parties
hereto that this Amendment is supplemental to the Lease. It is further
understood and agreed that all the terms, conditions and provisions of the
Lease, unless specifically modified herein, are to apply to this Amendment and
are made a part of this Amendment as though they were expressly written,
incorporated and included herein.

     IN WITNESS WHEREOF, the parties hereto have executed this Amendment this
29th day of October 1988.

                                        LESSOR:

                                        SIERRA PACIFIC POWER COMPANY

                                        By  /s/ Gerarld Canning
                                          --------------------------------------

*** Confidential material redacted and filed separately with the Commission.

                                       2

                                        Title: Vice President Electric Resources
                                               ---------------------------------

                                        LESSEE:

                                        FAR WEST HYDROELECTRIC FUND LTD.

                                        By  /s/ Indecipherable
                                          --------------------------------------
                                        Title:  Gen. Partner
                                              ----------------------------------
                                        Date: 10/27/88
                                              ----------------------------------

                                       3

                               THIRD AMENDMENT TO
                           GEOTHERMAL RESOURCES LEASE

THIS THIRD AMENDMENT to Geothermal Resources Lease is entered into as of the
date of its execution, by and between Sierra Pacific Power Company, a Nevada
corporation ("Lessor") and Far West Electric Energy Fund, L.P., a Delaware
limited partnership (formerly Far West Hydroelectric Fund, Ltd. a Utah limited
partnership before its change of name and change of domicile) ("Lessee").

                                    RECITALS.

     a. On November 13, 1983, Lessor and Geothermal Development Associates
entered into an Agreement for the Purchase and Sale of Electricity (the
"Original Power Purchase Agreement"). As the result of a series of assignments
consented to by Lessor, Lessee has become the seller under the Original Power
Purchase Agreement, which Agreement was amended on March 6, 1987.

     b. An unrecorded Geothermal Resources Lease dated November 18, 1983, was
executed by Sierra Pacific Power Company as Lessor, and Geothermal Development
Associates, as Lessee, as disclosed by a Memorandum of Lease by and between
Sierra Pacific Power Company and Geothermal Development Associates dated January
7, 1985, and recorded in Book 2115, page 321, as Document No. 971913 of said
Official Records (the "Lease"). Said Lease was amended by an unrecorded Letter
Amendment by and between Sierra Pacific Power Company and Geothermal Development
Associates dated January 7, 1985, as disclosed by the above Memorandum of Lease
and by an Amended Memorandum of Lease by and between the same parties dated
January 7, 1985, and recorded in Book 2116, page 812, as Document No. 972684 of
said Official Records. Said Lease was assigned by Geothermal Development
Associates to Ormat Systems Inc. by an Assignment of Lease dated September 26,
1985, and recorded in Book 2272, page 643 as Document 1043163 of said Official
Records, further assigned by Ormat Systems Inc. to Bonneville Pacific
Corporation by an Assignment of Lease dated September 26, 1985, and recorded in
Book 2272, page 647 as Document No. 1043164 of said Official Records, further
assigned by Bonneville Pacific Corporation to Far West Capital, Inc. ("FWC") by
an Assignment of Lease dated December 12, 1985, and recorded in Book 2272, page
750 as Document No. 1043167 of said Official Records, and further assigned by
FWC to Far West

                                       1

Hydroelectric Fund, Ltd. by Assignment of lease dated December 12, 1985, and
recorded in Book 2272, page 756, as Document No. 1043168 of said Official
Records, all of said assignments being disclosed by that certain Memorandum of
Lease, Assignments of Lease and Purchase Agreement by and among Geothermal
Development Associates, Ormat Systems Inc., Bonneville Pacific Corporation, FWC,
Far West Hydroelectric Fund, Ltd. and Sierra Pacific Power Company dated
December 31, 1985, and recorded in Book 2317, page 368 as Document 1062824 of
said Official Records. Said Lease was further amended by a Second Amendment to
Geothermal Resources Lease by and between Sierra Pacific Power Company and Far
West Hydroelectric Fund, Ltd. dated October 29, 1988.

     c. Lessee constructed and is operating a five megawatt geothermal power
plant ("Original Power Plant") on the leased property which is delivering power
to the Lessor under the Original Power Purchase Agreement.

     d. Lessor entered into a Long Term Agreement for the Purchase and Sale of
Electricity with FWC (the "1-A Power Purchase Agreement") dated October 29,
1988, and a Special Facilities Agreement ("Special Facilities Agreement") dated
October 29, 1988. The 1-A Power Purchase Agreement, and the Special Facilities
Agreement both relate to the 1.8 MW expansion of the Original Power Plant (the
"1-A Expansion"). The 1-A Expansion is located on the leased property which is
subleased to FWC. FWC has now assigned its rights and interests in the 1-A Power
Purchase Agreement and the Special Facilities Agreement to 1-A Enterprises, a
Nevada General Partnership ("1-A") and Lessor consented to said assignments on
August 18, l989.

     e. Lessee and 1-A have requested and Lessor has agreed that certain
portions of the Lease be modified or clarified.

     NOW THEREFORE, in consideration of the foregoing and the mutual covenants
contained herein, the parties agree as follows:

1. Section 3(c) of the Lease is hereby amended to add the following:

     (v) Any such payments made under this section shall be made by Lessee
within thirty (30) days of receipt of an invoice from Lessor requesting said
payment. Should Lessee fail to pay the amount of such invoice, Lessor may offset
future payments to Lessee under the applicable Original Power Purchase Agreement
or the 1-A Power Purchase Agreement by such amount. Such rights shall apply only
to amounts that become due and payable pursuant to this Lease, as amended.

                                       2

2. Section 12 of the Lease is hereby amended to read as follows:

12. ASSIGNMENTS AND SUBLEASES:

     a. Neither party shall voluntarily assign this Lease without the prior
written consent of the other party, unless the assignment is to a partnership in
which one of the parties to this Lease is a general partner.

     b. In the event that either party to this Lease wishes to assign this Lease
to a corporation or other entity, which does not fall into subsection (a) above,
said party shall provide the other party with written notice of such intent.
Such written notice shall describe the financial structure and assets of the
potential assignee in sufficient detail to permit the noticed party to evaluate
the effect of the assignment on its interest in this Lease and the even-dated
Agreement For The Purchase and Sale of Electricity executed by the parties
hereto. The noticed party shall have thirty (30) days from its receipt of the
notice to consent or refuse to consent to the assignment. Failure to give
written consent or refusal within said thirty-day period shall be deemed consent
by the noticed party. In no event shall consent to any assignment be
unreasonably withheld.

     c. In the event Lessee is contemplating an assignment such as described in
subsection (b) above, Lessor shall have a prior right to regain Lessee's rights
under the Lease, together with any and all related improvements, at the price
and on the terms of the intended assignment. Lessor may exercise this right by
notifying Lessee of its intent to do so by the end of the thirty-day period
described in subsection (b) above. Such notice shall also be deemed a refusal of
consent to the assignment of Lessee's rights to a third party. Subject to the
provisions of this paragraph, all obligations under this Lease as amended shall
be binding upon, and every benefit hereof shall inure to, the heirs, executors,
administrators, successors, and assigns of the respective parties thereto.

     d. Subject to subsections (a), (b), and (c) above, which refer to a
complete assignment of interest, from time to time and with prior written notice
to Lessor and without Lessor's consent, Lessee's leasehold estate in the leased
land and Lessee's right, title and interest as tenant in the Lease as amended
may be assigned for security purposes and be encumbered by one or more deeds of
trust, mortgages, security agreements, sale-and-leaseback arrangements,
leveraged leases or other security instruments or devices to secure a debt or
debts or other similar obligation or obligations.

                                       3

     e. From time to time and with the prior written consent of the Lessor, the
Lessee or its Sublessee may enter into Subleases of the leased property. Any
Sublessee may with notice to the Lessor and the Lessee but without their consent
may encumber its subleasehold interest by one or more deeds of trust, mortgages,
security agreements, sale-and-leaseback arrangements, leveraged leases or other
security instruments or devices to secure a debt or debts or other similar
obligation or obligations.

3. Lessor hereby grants to Lessee and its successors, assigns and sublessees the
right to use the easement, 45.0 feet in width described in that certain Basement
Agreement dated October 18, 1971, and recorded November 3, 1971, as Document No.
224422 at Book 589, page 533 in the Official Records of Washoe County, Nevada,
for roadway and electric utility purposes over, upon and across the property
described therein and subject to the terms thereof, which Easement Agreement is
attached hereto as Exhibit C and made a part hereof.

4. It is expressly understood and agreed by the parties hereto that this
Amendment is supplemental to the Lease. It is further understood and agreed that
all of the terms, conditions and provisions of this Lease, as amended, unless
specifically modified herein, are to apply to this Amendment and are made a part
of this Amendment as though they were expressed, incorporated and included
herein.

IN WITNESS WHEREOF, the parties hereto have executed this Lease as of the day
and year first above written.

                                                    LESSOR:
                                                    SIERRA PACIFIC POWER COMPANY

                                                    By /s/ Indecipherable
                                                       ------------------------
                                                    Title: Sr. Vice President
                                                           --------------------

                                                    LESSEE:

                                                    GEOTHERMAL DEVELOPMENT
                                                    ASSOCIATES

                                                    By /s/ Indecipherable
                                                       ------------------------
                                                    Title: President
                                                           --------------------

                                       4['69 Dec 5 AM 9:01]                                        [Notary Seal]

                                                                 Exhibit 10.4.7

                                 LEASE AGREEMENT

THIS AGREEMENT, made and entered into as of the 1st day of November, 1969, by
and between Chrisman B. Jackson and Sharon Jackson Husband and Wife hereinafter
called "Lessor" (whether one or more) and Standard Oil Company of California, a
corporation, hereinafter called "Lessee,"

                               W I T N E S S E T H

              1. Lessor, for and in consideration of the sum of $10 in hand
paid, and of the royalties herein provided and of the covenants and agreements
hereinafter contained, hereby grants, demises, leases and lets unto Lessee, the
land hereinafter described with the sole and exclusive right to Lessee to drill
for, produce, extract, take and remove therefrom water, brine, steam, steam
power, minerals (other than oil), salts, chemicals, gases (other than gas
associated with oil), and other products produced or extracted by Lessee from
any thereof. Each of the foregoing is hereinafter sometimes termed "a lease
product" and all thereof are sometimes termed "the lease products." For the same
consideration Lessee is hereby granted the right to store, utilize, process,
convert, and otherwise use such lease products upon said land and to sell the
same or any part thereof off said land during the term hereof, with the right of
entry thereon at all times for said purposes, and to construct, use, maintain,
erect, repair and replace thereon, and to remove therefrom all roads, pipelines,
ditches and lanes, telephone and telegraph lines, utility installations, power
lines, poles, tanks, evaporation or settling basins, extraction or processing
plants, machinery, equipment, buildings, electric power plants, and equipment
for generation and transmission of steam power, and electric power, and for the
handling, treatment or storage of lease products, and all structures and
facilities relating thereto, which Lessee may desire to erect, construct or
install in carrying on Lessee's business and operations on or from said land and
other lands in the vicinity on said land; and Lessee shall have the further
right to erect, maintain, operate and remove a plant or plants, structures and
facilities, with all necessary appurtenances for the conversion of steam to
electric power, and for the extraction of lease products from steam, brine or
water produced from said land, and other lands in the vicinity of said land,
including all rights necessary or convenient thereto, together with rights of
way for passage over, upon and across and ingress and egress to and from said
land for any or all of the above mentioned purposes. Lessee shall also have the
right to dispose of waste brine and other waste products in a well or wells
drilled or converted for that purpose on the leased land or on other land in the
vicinity, and the right to inject water, brine, steam and gases in a well or
wells on said land or such other land for the purpose of maintaining or
restoring pressure in the productive zones beneath said land or other land in
the vicinity thereof. The said land included in this lease is situated in the
County of Imperial, State of California, and is described as follows, to wit:

The North half of Tract No. 41 1/2, Township 16 South, Range 14 East, S. B. B. &
M., containing 80 acres of land more or less.

This lease shall cover all the interest in said land now owned or hereafter
acquired by Lessor, even though greater than the undivided interest (if any)
described above. For the purpose of calculating any payments based on acreage,
Lessee, at Lessee's option, may act as if said land and its constituent parcels
contain the acreage above stated, whether they actually contain more or less.

              2. Subject to the other provisions contained, this lease shall
remain in force for a period of ten (10) years from the date hereof, called the
"primary term," and thereafter so long as lease products, or any one or more of
them, is produced from, or Lessee is engaged in drilling, extraction, processing
or reworking operations on said land hereunder or on land pooled or unitized
with said land, as provided in Section 19 hereof, (said land, together with such
pooled or unitized land, being hereinafter sometimes called "the unit area").

              3. Lessee shall pay to Lessor, on or before the last day of each
calendar month, the royalties accrued and payable for the preceding calendar
month, and in making such payments Lessee shall furnish to Lessor statements
setting forth the basis for computation of such royalty.

As royalty and rental, Lessee shall pay to Lessor 10% of the value at the well
of all lease products produced, saved and sold. As used herein, the term "value
at the well" shall mean the actual price received by Lessee for the sale of
lease products at the well. If such products are not sold by Lessee at the well
but are sold at a plant or plants on or in the vicinity of said land, then the
value at the well shall be determined by deducting from the actual price
received by Lessee for the sale of such lease products all costs and expenses
incurred by Lessee in transporting, manufacturing, processing and otherwise
handling such lease products prior to the actual sale thereof. If lease products
are not sold by Lessee at the well or at such a plant but are otherwise used by
Lessee in its chemical operations or disposed of for value, then the value of
such lease products at the well shall be determined by deducting from the price
thereof at the nearest point where the same or similar products are sold in
substantial quantities, the cost of transporting, manufacturing, processing and
otherwise handling such lease products prior to sale thereof. Lessee shall
meter, gauge or otherwise determine the volume and quality of all, lease
products commingled and such metering or gauging shall furnish the basis for
computing Lessor's royalties hereunder. Lessee may use, free of royalty, steam,
steam power, electric power, and water developed from said land by Lessee, for
all operations hereunder, and Lessee shall not be required to account to Lessor
for, or pay royalty on any lease product or products reasonably lost or consumed
in operations hereunder.

                                       2

              4. Lessee agrees to commence drilling, extraction or processing
operations on said land or on the unit area within the period of ten (10) years
from the date hereof and to prosecute such operations with reasonable diligence
until lease products or any thereof shall have been found, extracted and
processed in quantities deemed paying quantities by Lessee, or until further
operations would, in the judgment of Lessee, be unprofitable or impracticable,
or Lessee may at any time within said primary term terminate this lease and
surrender said land; provided that, commencing with the 1st day of November,
1970, if Lessee has not theretofore commenced any such operations on said land
or on the unit area or terminated this lease, Lessee shall pay or tender to
Lessor annually, in advance, as rental, the sum of Forty and No/100 -------
Dollars ($40.00) (each of such annual periods being hereinafter referred to as
rental period") until operations are commenced on said land or lands which have
been pooled or unitized therewith, pursuant to paragraph 19 hereof, or this
lease terminated as herein provided; it being understood that in the event of
the surrender or termination of this lease as to any portion or portions of the
land covered thereby, said rental shall be reduced proportionately as provided
in paragraph 16 hereof. The consideration expressed in paragraph 1 hereof covers
all rental to the date last above mentioned. If Lessee shall elect not to
commence operations on said land or on the unit area during the primary term, as
above provided, this lease shall terminate.

              It is expressly understood and agreed by the parties hereto:

                a. That if within 10 years from the date hereof Lessee has not
         completed one or more wells or a processing plant on the unit area or
         on said land, capable of producing or processing lease products or any
         thereof in quantities and quality deemed paying quantities by Lessee,
         then Lessor may, at his option, terminate this lease; and

                b. That if within 15 years from the date hereof Lessee has not
         made or arranged for a sale or sales of lease products or any thereof,
         produced from or allocated to said land, then Lessor may, at his
         option, terminate this lease.

              5. If at any time or times after the primary term or within three
(3) months before expiration of the primary term, all operations and all
production hereunder on said land or on the unit area shall cease for any cause
other than those for which specific provision is made herein, this lease shall
not terminate if Lessee shall commence or resume drilling, processing,
extraction or reworking operations or production within three (3) months after
such cessation.

              6. Lessee shall be obligated to produce only such quantity or
quantities of lease products as it may be able to market at the well or wells,
plant or plants. It is recognized that the market demand for lease products may
vary from time to time and during such periods as there is no market at the
wells or plant for any lease product or

                                       3

products, Lessee's obligation to produce, process and extract such lease product
or products shall be suspended.

Subject to the foregoing and except as herein otherwise provided, it is agreed
that the Lessee shall drill such well and operate each completed well with
reasonable diligence and in accordance with good operating practice so long as
such wells shall produce lease products in paying quantities while this lease is
in force as to the portion of said land on which such tell or wells are
situated; but in conformity with any reasonable conservation program affecting
the drilling of wells or the production of lease products from said land, which
the Lessee may either voluntarily or by order of any authorized governmental
agency adopt, subscribe to or be subject to.

              7. The possession by Lessee of said land shall be sole and
exclusive excepting only that lessor reserves the right to occupy and use or to
lease the surface of said land for agricultural, horticultural or other surface
uses, except those granted to Lessee hereunder, which uses shall be carried on
by Lessor subject to, and with no interference with, the rights or operations of
Lessee hereunder. No well shall be drilled closer than 100 feet to any residence
or barn now on said land without written consent of Lessor. Lessee shall pay for
damages caused by Lessee's operations to houses, barns, growing crops, fences
and irrigation systems. Lessee shall have the right to drill such wells on said
land as Lessee say deem desirable for the purposes hereof and Lessee shall
utilize or use only so much of said land as is necessary or reasonably
convenient for Lessee's operations hereunder and shall interfere as little as
reasonably necessary with the use and occupancy of said land by Lessor. No
default of Lessee hereunder with respect to any well, or portion of this lease,
shall impair Lessee's rights with respect to any other well or portion of this
lease.

              8. The rights of Lessor and Lessee hereunder may be assigned in
whole or in part. No present or future division of Lessor's ownership as to
different portions or parcels of said land shall operate to enlarge the
obligations or diminish the rights of Lessee, and Lessee's operations may be
conducted without regard to any such division. If all or any part of this lease
is assigned, no leasehold owner shall be liable for any act or omission of any
other leasehold owner, and failure by one to pay rental shall not affect the
rights of others -- rental being apportionable in proportion to acreage.

              9. The obligations of Lessee hereunder shall be suspended (but
without impairment of Lessor's rights under (a) and (b) of paragraph 4 hereof)
while Lessee is prevented or hindered from complying therewith in part or in
whole, by strikes, lockouts, labor disturbances, acts of God, unavoidable
accidents, laws, rules, regulations or orders of any Federal, state, municipal
or other governmental agency, acts of war or conditions arising out of or
attributable to war, shortage of necessary material, equipment or labor, or
restrictions in, or limitations upon the use thereof, inability to secure or
absence of a

                                       4

market for the sale of lease products which can be produced or recovered in
commercial quantities from said land, delays in transportation, and also matters
beyond the control of Lessee, whether similar to the matters herein specifically
enumerated or not. This lease shall remain in full force and effect during any
suspension of Lessee's obligations under any provision of this paragraph, and
for a reasonable time thereafter, provided that after the removal of the cause
or causes preventing or hindering the performance of such obligation, Lessee,
subject to the other provisions of this Lease, diligently commences or resumes
the performance of such obligation. Notwithstanding anything to the contrary
herein provided, if any of Lessee's obligations hereunder conflict with or
violate the provisions of any reasonable conservation program or plan of orderly
development, whether now or hereafter adopted, to which Lessee may voluntarily
subscribe, or of any conservation program or plan which is now or may hereafter
be prescribed by any order of any governmental agency, Lessee shall not be
obligated, to perform such obligation.

              10. If Lessee shall fail to pay any installment of royalty or
rental when due and if such default shall continue for a period of 15 days after
receipt by Lessee of written notice thereof from Lessor to Lessee, then at the
option of Lessor, this lease shall terminate as to the portion or portions
thereof as to which Lessee is in default; provided, however, that if there be a
bona fide dispute as to the amount due and all undisputed amounts are paid, said
15-day period shall be extended until 5 days after such dispute is settled by
final court decree, arbitration or agreement.

If lessee shall be in default in the performance of any obligations under this
Lease, other than the payment of rentals or royalties, and if, for a period of
90 days after written notice is given to Lessee by Lessor of such default,
Lessee shall fail to commence and thereafter diligently and in good faith
prosecute action to remedy such default, Lessor may terminate this Lease.

              11. Lessee shall pay all taxes that may be levied against the
improvements, plant, machinery and personal property owned by Lessee and located
upon any part of said land.

              12. Lessee shall also pay Lessee's share of any and all taxes
assessed during the term of this lease upon any products of Lessee's operations
hereunder, together with Lessee's share of all severance, production and license
taxes or other taxes or assessments levied or assessed on account of the
production of lease products or any thereof on or from said land, or on or from
such portion of said land as Lessee may be holding under this lease on the date
of such tax lien.

              13. Lessor agrees to pay Lessor's share of any and all taxes
assessed upon any products of Lessee's operations hereunder, together with
Lessor's share of all severance, production and license taxes or other taxes or
assessments levied or assessed

                                       5

on account of the production of lease products from said land, and to pay all
other taxes assessed against said land, whether the same are assessed to Lessor
or Lessee or otherwise, and Lessee is hereby authorized to pay all such taxes
and assessments on behalf of Lessor and to deduct the amount so paid from any
royalties or moneys due Lessor hereunder. "Lessee's share" and "Lessor's share",
as used above refers to Lessee's and Lessor's respective proportionate parts of
the gross proceeds from the sale of any and all lease products produced, saved
and sold from said land by Lessee or allocated to said land under the terms of
any unit or pooling plan during the preceding calendar year.

              14. All royalties, rentals and other payments payable in money
hereunder shall be paid to Lessor by Lessee mailing or delivering a check
therefore to Lessor at 1075 So. 19th St. El. Centro, California, or Lessee may,
at its option, pay any or all royalties, rentals and other payments payable in
money hereunder by mailing or delivering a check therefor to
______________________________________________________________________, at
____________________________________________________________________,
______________________________________________________________________, its
successors and assigns, herein designated by Lessor as depositary, hereby
granting to said depositary full power and authority on behalf of Lessor and on
behalf of the heirs, executors, administrators, successors and assigns of
Lessor, and each of them, to collect and receipt for all sums of money due and
payable from Lessee to Lessor hereunder, and to settle all accounts end
accounting of rentals, royalties and other payments payable in money hereunder.
No change in the ownership of the land or minerals covered by this lease and no
assignment of rentals or royalties shall be binding upon Lessee or the
depositary until both Lessee and the depositary have been furnished with written
evidence thereof satisfactory to them. Said depositary above named shall
continue to act as such until the owners and holders of at least two-thirds of
Lessor's estate hereunder shall in writing designate a different depositary and
notify Lessee in writing at P.O. Box 3495 San Francisco, California 94120 of the
name and address of such new depositary. The payment of any and all rentals,
royalties and other payments hereunder by Lessee to the depositary designated
herein or to any other depositary hereafter designated by Lessor, as aforesaid,
shall be a full acquittance and discharge of Lessee of and from any and all
liability to Lessor, and to the heirs, executors, administrators, successors and
assigns of Lessor, and each of them, for any part of such rentals, royalties or
other payments, and Lessee will not be responsible at any time for the
disposition or disbursement by any such depositary of all or any part of any
moneys received by it hereunder.

              15. It is agreed that if Lessor owns a less interest in the sole
and exclusive rights herein granted Lessee, than the entire and undivided fee
simple estate therein, then any royalties, rentals and other payments herein
provided for shall be paid Lessor only in the proportion which Lessor's interest
bears to the whole and undivided fee. In the event

                                       6

Lessee's estate hereunder shall fail, for a cause other than Lessee's default
hereunder, in regard to any portion of said land or any interest therein, such
failure shall not affect or invalidate Lessee's estate hereunder. In regard to
the remaining portions of said lands or the remaining interests therein and this
lease shall nevertheless continue in full force and effect with respect to said
remaining portions of said land or remaining interests therein, and Lessee shall
not be accountable to Lessor for any payment theretofore made with respect to
said portion of said land or such interest in regard to which Lessee's estate
hereunder has failed. If and whenever it shall be necessary so to do in order to
protect Lessee's interest under this lease, Lessee may at its option pay and
discharge at any time any mortgage or other lien now or hereafter attaching to
said land or any part thereof and in such event Lessee shall be subrogated to
all of the rights of the owner or holder of such mortgage or other lien and
Lessee may in addition thereto, at its option, apply to the discharge of any
such mortgage or other lien, or to the reimbursement to Lessee for any amount so
paid by it, any rentals, royalties or other sums accruing or payable hereunder,
to the owner of the lands to which such mortgage or other lien attaches.

              16. Lessee may at any time or times surrender this lease as to all
or any portion of said land and be relieved of all obligations thereafter
accruing as to the acreage surrendered, and thereafter the rental shall be
reduced in the same proportion that the acreage covered hereby is reduced. In
the event this lease shall be surrendered under the provisions of this
paragraph, or assigned as hereinabove provided as to any portion or portions of
said land, Lessee shall have such rights of way or easements hereunder, over,
upon and across the land as to which this lease is so surrendered or assigned as
shall be necessary or convenient for Lessee's operations on the land retained by
it and other lands in the vicinity thereof. Upon any surrender or assignment of
this lease as to all or any portion of said land, Lessee shall be relieved of
all further obligations hereunder with respect to the lands so surrendered or
assigned. Any such surrender shall become effective upon delivery to Lessor, or
to the depositary bank herein designated, or the deposit in the United States
mail, postage prepaid, of a duly executed duplicate of an instrument of
surrender properly addressed to Lessor or to such depositary bank. Within a
reasonable time thereafter, Lessee shall record the original of such instrument
of surrender.

              17. Lessee shall have the right at any time and from time to time
during the continuance hereof and within a reasonable time after the surrender
or any termination of this lease, to remove from said land all equipment,
machinery, installations, and any other property or improvements belonging to or
furnished by Lessee or Lessee's permitees.

              18. All labor to be performed and material to be furnished in the
operations of Lessee hereunder shall be at the cost and expense of Lessee, and
Lessor shall not be chargeable with nor liable for any part thereof. Lessee
shall protect said land from liens arising from Lessee's operations thereon.

                                       7

              19.(a) Lessee is given the sole right and option by written
declaration of pooling at any time or from time to time, within twenty (20)
years from the date hereof, to combine, pool or unitize in whole or in part as
to any stratum or strata all or any part of said lands with other lands not
subject to this lease so as to create one or more reasonably compact operating
units for any operating or producing purpose. Such written declaration of
pooling shall describe the pooled lands and shall become effective when recorded
in the Office of the County Recorder in the county where the land is situated.
Lessee shall give written notice of such pooling to those Lessors whose lands
are so pooled. Lessors agree that with respect to all lease products obtained
from any lands included within any such operating unit, whether or not from
lands covered by this lease, there shall be allocated to and deemed to have been
produced from the lands covered by this lease and included in such operating
unit, only that proportion of the entire production from such operating unit
that the amount of acreage within the lands herein leased and included in such
operating unit bears to the total acreage of all of the land in such operating
unit, and royalty payable under this lease with respect to leased land included
in such operating unit shall be computed only on that portion of such production
so allocated to such leased lands. The entire acreage so pooled or unitized
shall be treated as if it were covered by one lease and the drilling of a well
or performance of any other obligations in any part of such operating unit,
whether or not on land subject to this lease, shall fulfill Lessee's drilling
and other obligations under this lease to the same extent as if such well were
drilled and other obligations performed on land subject to this lease. No offset
obligation shall accrue under this lease as a result of any well drilled within
any such operating unit. Lessee may, at its sole option, at any time when there
is no production in such operating unit of lease products in quantities deemed
paying by Lessee terminate such operating unit by a written declaration thereof,
in the same manner in which it was created.

              (b) Lessee is hereby granted the right at any time or times within
the period hereinafter provided to unitize this lease and the lands covered
hereby, in whole or in part or as to any stratum or strata, with other lands and
leases and to increase or decrease the size of any such unit. Any change in the
amount of Lessor's royalties resulting from unitization of this lease or from
any increase or decrease in the size of any such unit shall not be retroactive.
In the event of any such unitization, this lease, unless sooner terminated by
Lessee, shall continue in effect for so long as any of the lands hereby leased
remain subject to such unit. The drilling and producing operations conducted on
any of the unitized lands shall constitute full compliance with the drilling and
producing obligations of Lessee hereunder and Lessor shall be entitled to the
royalties in this lease provided, on the fractional part only, if any, of the
unit production allocated to this lease in accordance with the provisions of
said unit. The method of allocation of production from lands subject to said
unit shall be set forth therein and may be based upon the surface acreage or the
estimated volumetric content of recoverable lease products, or any

                                       8

weighing of either or both thereof, of lands within such unit or within the
estimated productive limits of such unit, or such allocation may be made upon
any other basis approved by State or Federal authorities having jurisdiction
thereof. The provisions of this paragraph authorizing the establishment and
enlargement or contraction of such unit and change of the ratio of participation
thereunder shall not extend beyond the period of twenty (20) years from the date
of this lease; provided, however, that if such unit is established before the
expiration of said twenty-year period, such unit may continue in effect beyond
said twenty-year period. Any such unit may be established, enlarged, or
diminished, and, in the absence of production therefrom, may be dissolved by
Lessee's filing for record an instrument so declaring. A copy of such instrument
shall be delivered to Lessor or to the depositary.

              20. Whenever used herein, the expression "drilling operations"
shall mean, for all purposes hereof, any work or actual operations undertaken or
commenced for the purpose of drilling of a well, including without limiting the
generality hereof, the preparation of the ground therefor, the building of roads
and other facilities therefor, the construction of a derrick and other necessary
structures for the drilling of a well followed by the actual operation of
drilling in the ground. Any such work or operations preliminary to the drilling
in the ground may be undertaken in any order Lessee shall see fit. All such work
and operations shall be prosecuted with reasonable diligence.

              21. This agreement may be executed in any number of counterparts
with the same force and effect as if all parties signed the same document.

              22. This lease shall be binding upon all who execute it, whether
or not they are named in the granting clause hereof and whether or not all
parties named in the granting clause execute this lease. All the provisions of
this lease shall inure to the benefit of and be binding upon the heirs,
executors, administrators, successors and assigns of Lessor and Lessee.

              IN WITNESS WHEREOF, the parties hereto have executed this
agreement.

STANDARD OIL COMPANY OF AMERICA

By: /s/ Indecipherable                    /s/ Chrisman B. Jackson
   ---------------------------         ----------------------------------
           Contract Agent              Chrisman B. Jackson

By: /s/ Indecipherable                    /s/ Sharon Jackson
   ---------------------------         ----------------------------------
          Assistant Secretary          Sharon Jackson, Husband and Wife

___________________________            __________________________________
           LESSEE                               LESSOR

                                       9

STATE OF CALIFORNIA        )
                           ):  ss.
COUNTY OF LOS ANGELES       )

State of California                )
                                    ):  ss.
City and County of San Francisco    )

              On November 25, 1969, before me, Edmond Lee Kelly, a Notary Public
in and for said City and County and State, residing therein, duly commissioned
and sworn, personally appeared A.T. SMITH and E.A. HANSEN known to me to be
CONTRACT AGENT and ASSISTANT SECRETARY, respectively, of STANDARD OIL COMPANY OF
CALIFORNIA the Corporation described in and that executed the within instrument,
and also known to me to be the persons who executed it on behalf of the said
Corporation therein named, and they acknowledged to me that such Corporation
executed the same.

              IN WITNESS WHEREOF, I have hereunto set my hand and affixed my
Official Seal, at my office in the City and County and State aforesaid the day
and year in this certificate above written.

                                   /s/ Indecipherable                18
                                   ----------------------------------
                                   Notary Public in and for said City and
                                   County of San Francisco, State of California

                                       10

                          AMENDMENT OF LEASE AGREEMENT

              THIS AGREEMENT, made this 1st day of April, 1976, by and between
CHRISMAN B. JACKSON and MARY ANGELA, his wife, hereinafter called "Lessor", and
STANDARD OIL COMPANY OF CALIFORNIA, a corporation, hereafter called "Lessee";

                              W I T N E S S E T H:

              THAT, WHEREAS, by that certain Lease Agreement dated November 1,
1969 and recorded in the Office of the County Recorder of Imperial County,
California, in Book 1286 at Page 643, et. seq. of Official Records, Lessors did
grant, let and lease unto Lessee for the purposes therein described certain
lands situate in said County and State, particularly described in such lease;
such lease being hereinafter referred to as "said lease"; and

              WHEREAS, Lessor and Lessee have agreed to amend said lease as
hereinafter set forth:

              NOW, THEREFORE, in consideration of the sum of One Dollar ($1.00)
and other valuable consideration, receipt of which is hereby acknowledged,
Lessor and Lessee agree as follows:

              1. The following paragraph is hereby added to said lease, as
amended, insofar as it covers said land:

       "23. Lessee agrees that when it physically occupies and uses the surface
       of said land, it shall pay Lessor rental in the amount of Two Hundred and
       No/100 Dollars ($200.00) per acre per year for so much of Lessor's
       surface acreage actually occupied and used. Such rental shall be payable
       annually in advance so long as said use continues. Said rental shall be
       comparable with rentals in general paid for other lands in the area for
       agricultural purposes and may be increased in the future to conform to
       any general increase in rentals for agricultural purposes."

              2. Lessor hereby ratifies said lease, as amended, and acknowledges
full performance by Lessee of all of its obligations thereunder to the date
hereof and, as herein amended, said lease shall remain in full force and effect
and, to implement this amendment, Lessor does hereby lease, let and demise unto
Lessee said lands pursuant to the terms of said lease, as amended.

              3. The provisions of this agreement shall be binding upon and
shall inure to the benefit of the respective heirs, executors, administrators,
successors and assigns of the parties hereto.

              4. Lessor hereby acknowledges receipt of rental in full for
surface use by Lessee referred to in Paragraph 1 hereof for the period June 30,
1974 to June 30, 1976.

                          AMENDMENT OF LEASE AGREEMENT

              THIS AGREEMENT, made this 1st day of October, 1979, between the
party or parties whoe names are subscribed hereto under the designation of
"Lessor", hereinafter called "Lessor" (whether one or more), and CHEVRON U.S.A.
INC. successor in interest to STANDARD OIL COMPANY OF CALIFORNIA, a corporation,
hereinafter called "Lessee",

                              W I T N E S S E T H:

              THAT, REFERENCE IS HEREBY HAD to certain Lease Agreement dated
November 1, 1969 (such lease being of record in the Office of the County
Recorder of Imperial County, California, in Book 1286, at Page 643, et seq., of
Official Records), whereby CHRISMAN B. AND SHARON JACKSON did grant, let and
lease unto Lessee for the purposes therein described certain lands situate in
said County and State particularly described in such lease, such lease being
hereinafter referred to as "said lease";

              AND, WHEREAS, by amendment of Lease Agreement dated April 1, 1976,
a short form of which was recorded in Book 1387, Page 1064 Official Records
Imperial County, California said Lease Agreement was amended;

              AND, WHEREAS, by Grant Deed dated December 14, 1977, and recorded
in Book 1410, Page 216 Official Records Imperial County, California, Lessor
became the owner and holder of Lessor's interest under said Lease Agreement as
amended;

              AND, WHEREAS, by amendment of lease agreement dated October 23,
1978, a short form of which was recorded in B-1430, P-1585, et seq. of official
records of Imperial County, California, said lease was amended;

              AND, WHEREAS, Lessor and Lessee have agreed to further amend said
lease in the particulars hereinafter set forth:

              NOW, THEREFORE, in consideration of the sum of ONE DOLLAR ($1.00)
and other valuable consideration paid to Lessor by Lessee, receipt of which is
hereby acknowledged, Lessor and Lessee agree as follows:

              1. Effective with the rental period that begins in 1979, that part
of the first sentence of Section 4 of said lease which now reads as follows:

              "...., the sum of Six Hundred & No/l00 DOLLARS ($600.00) ...."

              shall be and hereby is amended to read as follows:

              "...., the sum of One Thousand & No/100 DOLLARS ($1,000.00)...."

              2. To implement the foregoing, Lessor does hereby grant, demise,
lease and let unto Lessee all those certain lands particularly described in said
lease for the term and purposes and subject to all of the other provisions of
said lease as hereby amended. Lessor agrees that said lease as hereby amended is
in good standing and in full force and effect. Lessor acknowledges receipt of
rental in full under said lease to November 1, 1980.

              3. This agreement shall bind and inure to the benefit of the
respective heirs, executors, administrators, successors, and assigns of the
parties hereto.

                          AMENDMENT OF LEASE AGREEMENT

              THIS AGREEMENT, made this 23rd day of October, 1978 between the
party or parties whose names are subscribed hereto under the designation of
"Lessor", hereinafter called "Lessor" (whether one or more), and CHEVRON U.S.A.
INC. successor in interest to STANDARD OIL COMPANY OF CALIFORNIA, a corporation,
hereinafter called "Lessee",

                              W I T N E S S E T H:

              THAT, REFERENCE IS HEREBY HAD to that certain Lease Agreement
dated November 1, 1969 (such lease being of record in the Office of the County
Recorder of Imperial County, California, in Book 1236 at Page 643, et seq., of
Official Records), whereby CHRISMAN B. and Sharon Jackson did grant, let and
lease unto Lessee for the purposes therein described certain lands situate in
said County and State particularly described in such lease, such lease; being
hereinafter referred to as "said lease";

              AND, WHEREAS, by amendment of Lease Agreement a short form of
which was recorded in Book 1387, Page 1064 Official Records Imperial County,
California said Lease Agreement was amended;

              AND, WHEREAS, by Grant Deed dated December 14, 1977 and recorded
in Book 1410, Page 216 Official Records Imperial County, California, Lessor
became the owner and holder of Lessor's interest under said Lease Agreement as
amended;

              AND, WHEREAS, Lessor and Lessee have agreed to further amend said
lease in the particulars hereinafter set forth:

              NOW, THEREFORE, in consideration of the sum of ONE DOLLAR ($1.00)
and other valuable consideration paid to Lessor by Lessee, receipt of which is
hereby acknowledged, Lessor and Lessee agree as follows:

              1.     That part of the first sentence of Section 2 of said lease
which now reads as follows:

              "...., this lease shall remain in force for a period of ten (10)
years from the date hereof, called the 'primary term',...."

              shall be and hereby is amended to read as follows:

              "...., this lease shall remain in force for a period of fifteen
(15) years from the date hereof, called the 'primary term',...."

              2.     That part of the first sentence of Section 4 of said lease
which now reads as follows:

              "4. Lessee agrees to commence drilling, extraction or processing
operations on said land or on the unit area within the period of ten (10) years
from the date hereof...."

              shall be and hereby is amended to read as follows:

              "4. Lessee agrees to commence drilling, extraction or processing
operations on said land or on the unit area within the period of fifteen (15)
years from the date hereof...."

              3. Effective with the rental period that begins in 1979, that part
of the first sentence of Section 4 of said lease which now reads as follows:

              "...., the sum of Forty and NO/100 DOLLARS ($40.00)...."

              shall be and hereby is amended to read as follows:

              "...., the sum of Six Hundred and NO/100 DOLLARS ($600.00)...."

              4.     That part of Section 4a. of said lease which now reads as
     follows:

              "a.      That if within 10 years...."

              shall be and hereby is amended to read as follows:

              "a. That if within 15 years...."

              5.     That part of Section 4b. of said lease which now reads as
     follows:

              "b. That if within 15 years...."

              shall be and hereby is amended to read as follows:

              "b. That if within 20 years...."

              6. To implement the foregoing, Lessor does hereby grant, demise,
lease and let unto Lessee all those certain lands particularly described in said
lease for the term and purposes and subject to all of the other provisions of
said lease as hereby amended. Lessor agrees that said lease as hereby amended is
in good standing and in full force and

effect. Lessor acknowledges receipt of rental in full under said lease to
November 1, 1980.

              7. This agreement shall bind and inure to the benefit of the
respective heirs, executors, administrators, successors, and assigns of the
parties hereto.

              IN WITNESS WHEREOF, this agreement has been executed as of the day
and year first herein written.

LESSEE                                            LESSOR

CHEVRON U.S.A. INC.                               CHRISMAN B. JACKSON

By  /s/ Indecipherable                            By   /s/ Chrisman B. Jackson
   ------------------------                          -------------------------
   Its Attorney-in-Fact

STATE OF CALIFORNIA)
COUNTY OF IMPERIAL)

On October 23, 1978 before me, the undersigned, a Notary Public in and for said
State, personally appeared Chrisman B. Jackson, known to me to be the person
whose name is subscribed to the within instrument and acknowledged that he
executed the same.

WITNESS my hand and official seal.

     /s/ Pauline C. Montgomery
------------------------------        [Official seal of Pauline C. Montgomery]
   Pauline C. Montgomery

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