Document:

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

                                                                 EXHIBIT 10.4.22

                                             Lease and Agreement
                                             Union Oil Company of California

                                      UNION

     THIS LEASE AND AGREEMENT, made and entered into as of this 2nd day of June
1971, by and between DOROTHY GISLER, a widow, JOAN C. HILL and JEAN C. BROWNING

hereinafter referred so as "Lessor", whether one or more, and UNION OIL COMPANY
OF CALIFORNIA, a California corporation, hereinafter referred to as "Lessee".

     WITNESSETH: That Lessor, for and in consideration of Ten Dollars ($10.00)
in hand paid to Lessor by Lessee, the rentals provided for hereinafter, and
other good and valuable consideration, the receipt and adequacy of which are
hereby acknowledged, and in consideration of the covenants and agreements
hereinafter contained by the Lessee to be kept and performed. Lessor has
granted, leased, let and demised and by these presents does grant, lease, let
and demise to Lessee, its grantees, successors and assigns, upon end subject to
the terms and conditions hereinafter set forth, all that certain land (herein
sometimes referred to as the "leased land") situate in the County of Imperial,
State of California, and more particularly described as follows, to-wit:

(deemed to contain, for the purposes hereof, 204.52 acres, whether there be more
or less) with the sole and exclusive right to Lessee to explore for (by such
methods as it may desire), drill for, produce, extract, take, remove and sell
hot water, steam and thermal energy and extractable

                                                         Lease No. Weber 602051
                                                                         ------

minerals from, and to store, utilize, process, convert and otherwise treat such
hot water, steam and thermal energy upon, said land, and to extract any
extractable minerals during the term hereof, and to inject or reinject in the
leased land effluence from wells located on the leased land or on lands in the
vicinity thereof, with the right of entry on the leased land and use and
occupancy thereof-at all times for said purposes and the furtherance thereof,
including the right to construct, use and maintain thereon and to remove
therefrom structures, facilities and installations, pipe lines, utility lines,
power and transmission lines. Further, the Lessee is hereby granted the use of
roads and ponds on said land together with such rights of way and easements
across said land for the construction of roads, ponds, pipe lines, power and
telephone transmission lines as are necessary or convenient for the exploration,
operation and development of Leased Substances on the leased land or in the
vicinity thereof. In the event this lease should terminate with respect to all
other rights for any reason, the rights herein granted with respect to such
roads, ponds, rights of way and/or easements as are being used at the time of
such termination shall remain in effect so long as such roads, ponds, rights of
way and/or easements are being used by the Lessee, its successors and assigns.
Following such termination, Lessee agrees to pay an annual rental during the
period of use at the rate of ten per cent (10%) of the then current value used
in tax assessments of the land occupied by such roads, ponds, rights of way
and/or easements being used. The possession by Lessee of the leased land shall
be sole and exclusive for the purposes hereof and for purposes incident or
related thereto, excepting that Lessor reserves the right to use and occupy said
land, or to lease or otherwise deal with the same, without unreasonable
interference with Lessee's rights, for mining or extraction and utilization of
minerals lying on the surface of or in vein deposits on or in said land, or for
the extraction of oil, natural hydrocarbon gas and other hydrocarbon substances,
or for any and all uses other than the use and rights permitted to Lessee
hereunder. Lessee agrees to conduct Its activities in a manner which will not
unreasonably interfere with the rights reserved to Lessor. The leased land
includes also any rights of Lessor, presently owned or hereafter acquired, in
and under roads, underlying ditches, and rights of way traversing or adjacent to
said land.

     For the purposes hereof the following definitions shall apply:

     (a) The terms "hot water", "steam" and "thermal energy" shall mean natural
geothermal water and/or steam, and shall also mean the natural heat of the earth
and the energy present in, resulting from or created by, or which may be
extracted from, the natural heat of the earth or the heat present below the
surface of the earth, in whatever form such heat or energy occurs;

     (b) The term "extractable minerals" shall mean any minerals in solution in
the well effluence and all minerals and gases produced from or by means of any
well or wells on the leased land or by means of condensing steam or processing
water produced from or the effluence from any such well or wells; said term
shall also include any water so produced or obtained from condensation of steam;
and further provided that the term "gases" shall not include hydrocarbon gases
that can be produced separately from the hot water, steam and associated
minerals;

     (c) The term "Leased Substances" shall collectively refer to the matter,
substances and resources, defined in (a) and (b) above, that are the subject of
this lease;

     (d) The term "power potential" as used herein with respect to any well or
wells shall mean the quantity, or units, of energy capable of being recovered
from the hot water, steam or thermal energy produced therefrom by means of any
energy conversion or utilization facility (including, but not limited to,
electrical generating facilities) or equipment designed for use thereof;

     (e) The term "sufficient power potential" as used herein shall be deemed to
mean that power potential which, in the judgment of Lessee shall be sufficient
for the commercial sale or utilization thereof, or shall warrant the
construction of facilities for the commercial sale or other utilization thereof,
or shall justify additional drilling or other operations on the leased land;

     (f) The word "commercial" used in connection with various phrases herein
shall mean those quantities of Leased Substances produced, sold or used, the
value of which, after deducting Lessee's operating costs (or extraction costs in
case of extractable minerals), will provide to Lessee a net return over such
costs sufficient to cause Lessee to continue production thereof or to elect to
proceed with further development or exploratory operations on the leased land.

     The terms and conditions of this Lease and Agreement are as follows,
to-wit:

     1. This lease shall be for a term of ten (10) years from and after the date
hereof (herein called "primary term") and so long thereafter as Leased
Substances, or any of them, be derived or produced in commercial quantities from
the leased land or lands pooled or combined therewith, and for so long, as well,
as Lessee is prevented from producing same, or the obligations of Lessee
hereunder are suspended, for the causes hereinafter set forth.

     If at the expiration of the primary term Lessee has not completed one or
more wells on the leased land, or land pooled therewith, separately or
collectively producing or being capable of producing steam of sufficient power
potential and/or extractable minerals in commercial quantities but Lessee is
then engaged in operations for drilling or reworking of any well on the leased
land or land pooled therewith, this lease shall remain in force so long as
drilling or reworking operations are prosecuted (whether on the same or
different wells) with no cessation of more than six (6) months, and if they
result in production or the establishment to the satisfaction of the Lessee of
the existence of sufficient power potential and/or extractable minerals in
commercial quantities, such well or wells will be deemed to have been completed
and such existence so established during the primary term of this lease.

     2. It is understood and agreed that the initial consideration paid upon the
execution hereof covers not only the privileges granted to the date when a
rental is payable as hereinafter provided, but any and all other rights
conferred hereunder. If on or before one (1) year from the date hereof Lessee
has not drilled such well or wells on the leased land or land pooled therewith
as to indicate or establish to the satisfaction of Lessee the existence of
sufficient power potential and/or extractable minerals in commercial quantities,
then, but subject to Lessee's right of surrender, on or before said anniversary
date, Lessee shall pay or tender to Lessor an annual rental in the amount of One
Thousand Twenty-Two and 60/100 - - - - - Dollars ($1,022.60), which shall
constitute rental until the next anniversary date hereof, and thereafter Lessee
shall, on or before each succeeding anniversary date during the primary term
hereunder, pay or tender

to Lessor an annual rental in the aforesaid amount, this until such time as from
the drilling of well or wells on the leased land, or tend pooled therewith,
there has been established to the satisfaction of the Lessee the existence of
sufficient power potential and/or extractable minerals in commercial quantities.
Upon such establishing as aforesaid, Lessee may nevertheless continue to pay or
tender annual rental payments on or before each anniversary date, this until
Lessee has commenced the actual sale of one or more Leased Substances, and so
long as such annual rental payments be so paid or tendered this lease shall
remain in force and effect, even though thereby extended past the primary term,
and all payments so paid or tendered after the expiration of said primary term
shall be deemed advance royalties, and so long as same are paid each well or
wells shall be deemed to be actually producing one or more Leased Substances in
commercial quantities under the terms hereof; provided, however, that if within
five (5) years from the date of expiration of the primary term hereof Lessee
shall have failed to make, or make arrangements for by executed contract or
contracts, a bona fide commercial sale of one or more Leased Substances then
Lessor, at its option, may consider Lessee in default hereunder. Additionally,
should Lessee fail to make any annual payment herein provided for on or before a
particular anniversary date, Lessor may, at its option, consider Lessee in
default hereunder.

     3. Lessee shall pay to Lessor a royalty Ten Percent (10%) of the gross
proceeds received by Lease from the sale of hot water, steam or thermal energy,
as such, produced from the leased land at and as of the point of origin on the
leased land; royalty on steam may be computed and paid for on the basis of
pounds of steam produced, saved and sold by Lessee, or may be computed on the
basis of the number of kilowatt hours of electric power generated by the use of
such steam, but shall be computed and paid for on whatever basis which shall
properly reflect the royalty portion of the gross proceeds received by Lessee
from sale of hot water, steam and thermal energy, as such, produced from the
leased land at and as of the point of origin on the leased land. With respect to
extractable minerals, a royalty Lessee shall pay to Lessor Ten Percent (10%) of
the net proceeds received by Lessee from the sale of any gas (as herein defined)
and from the sale of effluence (containing minerals and/or minerals in solution)
produced and sold from any well or walls on the leased land, or, in the event
Lessee extracts from the effluence minerals and/or minerals in solution Ten
Percent (10%) of the proceeds received by Lessee from the sale of minerals
and/or minerals in solution contained in and extracted from the effluence
produced and sold from such well or wells less costs of transportation and
extraction. Lessee shall pay to Lessor on or before the twenty-fifth day of each
month the royalties accrued and payable for the preceding calendar month, or on
or before the twenty-fifth day of the month next following that in which Lessee
receives payment therefor from the purchaser thereof, whichever method shall
apply, and in making such royalty payments Lessee shall deliver to Lessor
statements setting forth the basis for computation and determination of such
royalty.

     Lessee shall not be required to account to Lessor for or to pay any royalty
on hot water, steam, thermal energy or extractable minerals produced by Lessee
on the leased land which are not utilized, saved and sold, or which are used by
Lessee in its operations on or with respect to the leased land for or in
connection with the developing, recovering, producing, extracting and/or
processing of hot water, steam and/or minerals in solution or in facilities used
in connection therewith, including operations of facilities for the generation
of electric power, or which are unavoidably lost.

     Lessee shall have the right, from time to time and at any time, to
commingle (for purposes of storing, transporting, utilizing, selling or
processing, or any of them) the or any of the Leased Substances produced or
extracted from production from the leased land or lands pooled therewith with
like Leased Substances, or any of them, produced from other lands or units in
the vicinity of the leased land, and in the event of such commingling Lessee
shall meter, gauge or measure the production from the leased land, or from the
unit or units including same or other units or lands, as the case may be, and
compute and pay Lessor's royalty payable under the provisions hereof on the
basis of such production so determined or allocated, as the case may be.

     4. Lessee may, at any time or from time to time as a recurring right,
either before of after production but within twenty (20) years from the date
hereof, for drilling, development, or operating purposes, pool, unitize or
combine all or any part of the leased land into a unit with any other land or
lands or lease or leases (whether held by Lessee or others) adjacent, adjoining
or in the immediate vicinity of the leased land which Lessee desires to develop
or operate as a unit, provided that the total acreage to be embraced within any
such drilling, development, or operating unit shall not exceed one thousand nine
hundred twenty (1,920) acres, plus an acreage tolerance of Ten Percent (10%).
Such a unit shall become in existence upon Lessee's filing in the office of the
County Recorder in the county in which the leased land is situated a notice of
such unitization, describing said unit. Lessee shall also mail a copy of such
notice to Lessor. 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 Lessee shall have the same
rights and obligations with respect thereto and to drilling and producing
operations upon the lands from time to time included within any such unit a
Lessee would have if such lands constituted the leased land; provided, however,
that notwithstanding this or any other provision or provisions of this lease to
the contrary:

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

     (2) if any taxes of any kind are levied or assessed (other than taxes on
the land and on Lessor's improvements), any portion of which is chargeable to
Lessor under Paragraph 12 hereof, then the share of such taxes to be borne by
Lessor as provided in this lease, shall be in proportion to the share of the
production from such unit allocated to the leased land.

     Allocation as aforesaid of production from any such unit, whether to the
leased land or in like manner to other lands therein, shall continue
notwithstanding any termination, either in whole or in part (by surrender,
forfeiture or otherwise), of this or any other lease covering lands in such unit
until such time as the owner of such lands so terminated shall enter into an
agreement to drill for or produce or shall drill for or produce or permit or
cause the drilling for or production from any part of such lands, whereupon all
such lands formerly included in such unit and as to which the lease covering the
same shall have terminated shall be excluded in

determining the production to be allocated to the respective lands in such unit;
additionally, in the event of the failure of Lessor's, or any other owner's,
title as to any portion of the land included in any such unit, such portion of
such land shall likewise be excluded in allocating production from such unit;
provided, however, Lessee shall not be held to account for any production
allocated to any lands excluded from any such operating unit unless and until
Lessee has actual knowledge of the aforesaid circumstances requiring such
exclusion. Any exclusion shall be deemed effective the first day of the month
next following the date upon which such exclusion becomes finally established.

     Lessee may, at its sole option, at any time when there is no production in
such unit of Leased Substances in quantities deemed paying by Lessee, terminate
such unit by a written declaration thereof, in the same manner in which it was
created.

     5. At such time as Lessee shall have drilled and completed such well or
wells on the leased land or land pooled therewith which shall indicate to the
satisfaction of Lessee a sufficient power potential, or the existence of
extractable minerals in commercial quantities, Lessee may at any time thereafter
construct and install on the leased land facilities for the commercial sale or
use of hot water, steam or thermal energy produced from the leased land or lands
in the vicinity thereof or pooled therewith, or for the extraction of
extractable minerals, or for development of electric power from the use of steam
or thermal energy produced from the leased land or lands in the vicinity thereof
or pooled therewith.

     6. Lessee shall have the right to drill such well or wells on the leased
land as Lessee may deem desirable for the purposes hereof, including wells for
injection or re-injection purposes; provided, however, that Lessee agrees to
utilize for such purpose or purposes only so much of the leased land as shall be
reasonably necessary for Lessee's operations and activities thereon. No well
shall be drilled within one hundred (100) feet of any residence or barn now on
said land without Lessor's consent. Lessee shall have free use of water from
said land for all operations thereon or on land pooled therewith, provided that
such free use shall not interfere with Lessor's own use for domestic,
commercial, stock or agricultural purposes, nor interfere with any contractual
commitments of Lessor relating thereto and existing on the date hereof. Lessee
shall not be entitled to free ___________ which has been or is being purchased
by Lessor.

     6-a. Notwithstanding any provisions to the contrary contained herein, this
lease and all rights granted to Lessee hereunder are expressly limited to those
depths lying below 500 feet below the surface of the leased lands and Lessee
shall not have the right to enter upon or use any portion of said leased lands
lying above said depth.

     Lessee shall protect said land against liens of every character arising
from its operation thereon. Lessee, at its own expense, prior to commencing
operations on the leased land, shall obtain, and thereafter while this lease is
in effect shall maintain, adequate Workmens Compensation Insurance. Lessee shall
protect Lessor against damages of every kind and character arising out of the
operations or working of Lessee or those under Lessee's control upon the leased
land, but Lessee shall not be liable hereunder in the event of the negligence or
willful misconduct of parties other than Lessee. In the event any building or
personal property be

damaged or destroyed, or grazing or agricultural lands be destroyed by Lessee's
operations, then Lessee shall be liable for, and to the extent of, the
reasonable value thereof.

     Lessee shall have the right at any time and from time to time to remove
from the leased land any and all casing, mach-

     6-a. Notwithstanding any provisions to the contrary contained herein, this
lease and all rights granted to Lessee hereunder are expressly limited to those
depths lying below 500 feet below the surface of the leased lands and Lessee
shall not have the right to enter upon or use any portion of said leased lands
lying above said depth.

then producing or capable of producing or being drilled, and in respect to which
Lessee shall not be in default, together with the rights, rights of way and
easements which may be retained by Lessee by virtue of the granting clause of
this lease, and together with rights granted Lessee in Paragraph 5, hereof.

     9. Notwithstanding any other provisions of this lease, and in consideration
of the payment made by the Lessee to the Lessor for the execution of this lease,
Lessee shall have the right at any time prior to or after default hereunder, to
quitclaim and surrender to Lessor all right, title and interest of Lessee in and
to the leased land, or any part thereof, and thereupon all rights and
obligations of the parties hereto one to the other shall cease and terminate as
to the lands or areas so quitclaimed and surrendered, save and except as to any
then accrued monetary obligations or royalty obligations of Lessee then payable
as to which Lessee shall remain liable to Lessor, and save and except the
rights, rights of way and easements which may be retained by Lessee by virtue of
the granting clause of this lease, and provided that in the event of a partial
quitclaim and surrender, any future rentals will be reduced proportionately by
the number of acres in the area so quitclaimed and surrendered.

     10. In the event Lessor at the time of making this lease owns a less
interest in the leased land than One Hundred Percent (100%) of the rights and
interests herein granted or leased to Lessee, then the rentals and royalties
accruing hereunder shall be paid to Lessor only in the proportions which
Lessor's interest bears to a One Hundred Percent (100%) interest therein in the
leased land. Notwithstanding the foregoing, should Lessor hereafter acquire any
additional right, title or interest in or to the leased land, it shall be
subject to the provisions hereof to the same extent as if owned by Lessor at the
date hereof, and any increase in payments of money hereunder necessitated
thereby shall commence with the payment next following receipt by Lessee of
satisfactory evidence of Lessor's acquisition of such additional interest.

     11. Lessor hereby warrants and agrees to defend title to the leased land
and agrees that Lessee, at its option, may pay and discharge any taxes,
mortgages, trust deeds or other liens or encumbrances existing, levied or
assessed on or against the leased land, and in the event Lessee exercises such
option, Lessee shall be subrogated to the rights of any holder or holders
thereof, and shall have, among other rights, the right of applying to the
discharge of any such mortgage, tax or other lien or encumbrance any royalties
or rentals accruing to Lessor hereunder.

     12. Lessee shall pay all taxes levied on Lessee's structures and
improvements placed on the leased land by Lessee. Lessee shall pay 90% and the
Lessor shall pay 10% of any taxes

assessed against any Leased Substances stored on the leased land. In the event
any taxes are levied or assessed against the right to produce Leased Substances
from the leased land or in the event any increase in the taxes levied or
assessed against the leased land shall be based upon the production from the
leased land of Leased Substances, then in either such event Lessee shall pay 90%
of any such taxes or increase, as the case may be, and Lessor shall pay 10%
thereof. Lessor shall pay all taxes levied or assessed against the leased land
as such without reference to the production of Leased Substances therefrom and
shall pay all taxes levied and assessed against any and all rights in or to or
with respect to the leased land not covered by this lease and shall pay all
taxes levied and assessed against all structures and improvements owned by
Lessor or placed on the leased land by or pursuant to permission of Lessor.

     13. The rights of either party hereunder may be assigned in whole or in
part, and the right and privilege so to do is hereby reserved by each party, and
the provisions hereof shall extend to the heirs, successors and assigns of the
parties hereto, but no change or division in ownership of the land, rentals or
royalties, however accomplished, shall operate to enlarge the obligations or
diminish the rights of Lessee, and Lessee may continue to operate the leased
land and to pay and settle rentals or royalties as an entirety, and no such
change in ownership shall be binding upon Lessee until the expiration of thirty
(30) days after Lessee is furnished with satisfactory written evidence thereof.
In the event of assignment of this lease as to a segregated portion of said
land, the rentals payable hereunder shall be apportionable between the several
leasehold owners ratably according to the surface area of each, and default in
rental payment by one shall not affect the rights of other leasehold owners
hereunder.

     14. The obligations of Lessee hereunder shall be suspended and the term of
this lease shall be extended, as the case may be, while Lessee is prevented from
complying therewith, in whole or in part, by strikes, lockouts, riots, actions
of the elements, accidents, delays in transportation, inability to secure labor
or materials in the open market, laws, rules or regulations of any federal,
state, municipal or other governmental agency, authority or representative, or
other matters or conditions beyond the reasonable control of Lessee, whether or
not similar to the conditions or matters herein specifically enumerated.

     If at any time after the expiration of fifteen (15) years from date hereof
the production of all Leased Substances ceases for any cause other than one or
more of the causes hereinabove enumerated, this lease shall nevertheless remain
in full force and effect for an additional period of one (1) year from cessation
and thereafter if, and so long as, Lessee commences and continues diligently and
in good faith the steps, operations or procedures to cause a resumption of such
production (either through the existing wells or the drilling of new wells),
until such production be resumed.

     15. All statements of production and royalty and all payments to be made by
Lessee to Lessor hereunder shall be sent to the persons hereinafter set forth,
respectively, at the addresses indicated and each such person shall be entitled
to receive that portion of the total rentals and royalty payable hereunder as is
hereinafter set forth after the name of such person:

Lessee shall, upon notification of change of ownership in the lands or in
rentals or royalties hereunder, as provided in Paragraph 13 hereof, divide and
distribute the same to the new owners of such interests; provided, however, that
if at any time there are three or more persons entitled to rentals or royalties
hereunder, Lessee may, at its option, withhold payment of such rentals or
royalties until a majority in interest of such persons designate in writing in a
recordable instrument delivered to Lessee, a bank, trust company or corporation,
as a common agent and depositary, to receive all payments due hereunder to such
persons. Such designation may be changed at any time in the same manner.
Delivery of all statements and payments hereunder may be made by depositing the
same in the United States mail duly addressed to Lessor at the above address or
addresses or to such agent and depositary which shall constitute full
performance of Lessee's obligation to make such delivery. In the event that the
amount payable under this lease shall result in a payment of less than Five
Dollars ($5.00) becoming due Lessor, Lessee may, at its option, withhold and
accrue sufficient periodic payments until the total due Lessor exceeds Five
Dollars ($5.00).

     16. Any notice herein required or permitted to be given or furnished by one
party to the other shall be in writing. Delivery of such written notice to
Lessor shall be made by depositing the same in the United States mail duly
certified and addressed to Lessor at c/o James R. Moore, Rutan & Tucker, 401
Civic Center Drive West, Santa Ana, California 92701 and delivery of such
written notice to Lessee shall be made by depositing the same in the United
States mail duly certified and addressed to Lessee at Union Oil Center, 461
South Boylston Street, Los Angeles, California 90017. Either party hereto may by
written notice to the other party change its address to any other location.

     17. In the event any part or portion or provision of this instrument shall
be found or declared to be null, void or unenforceable for any reason whatsoever
by any Court of competent jurisdiction or any governmental agency having
authority thereover, then and in such event only such part, portion or provision
shall be affected thereby, and such finding, ruling or decision shall not in any
way affect the remainder of this instrument or any of the other terms or
condition hereof, which said remaining terms and conditions shall remain
binding, valid and subsisting and in full force and effect between the parties
hereto, it being specifically understood and agreed that the provisions hereof
are severable for the purposes of the provisions of this clause. In this
connection, this lease shall not in any event extend beyond such term as may be
legally permissible under present applicable laws, and should any such
applicable law limit the term hereof to less than that herein provided, then
this lease shall not be void but shall be deemed to be in existence for such
term and no longer.

     18. If more than one person is named as a Lessor herein and one or more of
them fails to execute this lease, said lease shall nevertheless (when accepted
by Lessee) become effective as a lease from such of said named parties Lessor as
may have executed the same.

     19. This lease may be executed in any number of counterparts and all such
counterparts shall be deemed to constitute a single lease and the execution of
one counterpart by any party Lessor shall have the same force and effect as if
such party had signed all the other counterparts.

     20. This Lease and Agreement and all of the terms, covenants and conditions
hereof shall extend to the benefit of and be binding upon the respective heirs,
successors and assigns of the parties hereto.

     IN WITNESS WHEREOF, the parties have caused this instrument to be duly
executed as of the date hereinabove first written.

                                              /s/
------------------------------------          ----------------------------------
                                                 Dorothy Gisler

                                              /s/
------------------------------------          ----------------------------------
                                                 John C. Hill

                                              /s/
------------------------------------          ----------------------------------
                                                 Jean C. Browning

------------------------------------          ----------------------------------
                 Subscribing Witness                                      Lessor

                                              UNION OIL COMPANY OF CALIFORNIA

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

                                                                 Exhibit 10.4.23

                         GEOTHERMAL LEASE AND AGREEMENT

     THIS LEASE AND AGREEMENT is made this 15th day of February, 1977, by and
between the undersigned WALTER J. HOLTZ, as Lessor, and MAGMA ENERGY, INC., a
corporation, as Lessee.

     1. WITNESSETH: For and in consideration of ten dollars ($10.00) to the
Lessor paid and other good and valuable consideration, the receipt of which is
hereby acknowledged and in consideration of the covenants and agreements as
herein provided, the Lessor does grant, lease, let and demise unto the Lessee,
its successors and assigns, the land and premises hereinafter described, with
the sole and exclusive right to the Lessee to enter upon and to use and occupy
the said land to explore for, drill for, develop, mine, produce and utilize
geotherma1 steam, geotherma1 fluids, hot water, brines, electric energy and the
heat and energy of the Earth in all its forms (hereinafter called "Geothermal
Resources"), and by-products thereof and products associated therewith (except
oil, gas and other hydrocarbons), and to take, store, remove, dispose of and use
same and for uses and purposes incidental thereto, together with the right to
utilize the leased land and to construct, maintain and use any and all
facilities thereon and therein as may be necessary for Lessee's operations on
the leased land or other land in the vicinity of the leased land and for
utilization of the geotherma1 resources and other products produced therefrom,
including but not limited to well sites, pipelines, power stations and
transmission lines, roads, structures and installations relating thereto,
service facilities,

tanks, ponds, wells for injection or reinjection of waste geothermal resources,
gases and other residual products.

     2. Lessor reserves the exclusive right to utilize said land for all other
purposes which do not unreasonably interfere with Lessee's operations. If
Lessee's operations on the land cause damage or loss of stock, crops, or
property, Lessee shall compensate the injured party for such loss within 90 days
after demand therefore, Lessee agrees to indemnify and hold Lessor harmless from
any loss or injury to any party not a party hereto, by reason of any act or
omission of Lessee during its tenancy hereunder. Lessee before commencing any
operations on the leased land shall procure public liability and property damage
insurance with limits not less than $500,000.00 as to public liability and
$100,000.00 as to property damage, naming Lessor as a co-insured and shall
deliver a certificate of such insurance to Lessor. Lessee through its actions
shall not permit any mechanics lien, or other claim of any kind to become an
encumbrance upon Lessor's title to the leased land. If Lessee fails to take
action to remove any lien or claim that may be filed within 30 days after demand
by Lessor, Lessor at its option, may terminate this lease upon 10 days written
notice.

     3. This lease shall be for a period of five (5) years from the date hereof
(hereinafter called "primary term") and so long thereafter as rent or royalty is
being paid hereunder or any of the aforesaid substances is produced therefrom or
from land pooled or unitized therewith, or drilling, development, testing or
producing operations are conducted thereon, or excused under the terms hereof.

                                       2

     4. In addition to the initial consideration, the first year's rental of
$*** will be paid to Lessor upon the execution of this Lease. Thereafter,
commencing with the first anniversary of the term hereof, Lessee shall pay to
Lessor as rental yearly in advance the sum of *** dollars ($***) per acre per
year for so much of said land as may then still be under this Lease, until such
time as royalties paid to Lessor are equal to or greater than *** dollars ($***)
per acre per year.

     5. The land covered hereby is described in Exhibit "A" attached hereto and
made a part hereof.

     6. Notwithstanding any other provision of this Lease, it is specifically
understood and agreed that if at the end of five (5) years from date of
expiration of the primary term hereof, Lessee has not commenced production and
sale in commercial quantities of geothermal resources, or any other upon which
royalty is payable to Lessor hereunder, or if after commencing production and
sale of such substances, Lessee shall discontinue same for a period of six
months in any calendar year, then Lessee shall default under this Lease and at
Lessor's Option, this Lease may be terminated if Lessee shall fail to remedy
such default as herein provided or written notice of default from Lessor to
Lessee; provided, however, that no default shall be deemed to exist where such
discontinuance of production or sale is caused by governmental regulations or
restrictions, shutdown for repairs, maintenance, modification or enlargement of
Lessee's electric generating facilities, or because of any of the conditions as
set forth in paragraph 15 below.

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

                                       3

     7. Any lands required by Lessee for location of well or wells, easements,
rights of way, egress, ingress, pipelines, or other surface or subsurface
facilities of any kind, hereinafter called "Occupied Land", excepting, however,
those facilities referred to in paragraph 9 below, shall be submitted to Lessor
for his consent and approval before operations on such lands or use thereof are
commenced. Unless Lessor dissents to the location or locations submitted within
five days, and offers a substitute location within 10 days of receiving notice
of Lessee's proposed location, Lessee may consider the request as submitted
approved and may proceed with its planned locations on such lands or use
thereof. Lessor shall not be unreasonable or arbitrary as to the selection or
approval of such sites.

     Should Lessor cause the leased land or any portion thereof to be used for
other than agricultural purposes he shall have the right, at his expense, with
the exception of any well or wells, to cause the aforesaid easements, _______ to
be relocated. Any well site shall consist of not more than two sites and there
shall be a limit of one site per 40 acres of leased land. ____________ Lessee
shall continue to pay all royalties attributable to Occupied site.

     8. Lessee shall pay Lessor yearly rental for Occupied Land adjusted
annually, equal to farming rentals being paid per acre to owners of adjacent or
adjoining farm land, but in no case less than $*** per acre per year. The
parties acknowledge that said farming rental is presently $*** per acre per
year.

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

                                       4

     9. Lessor shall also make available to the Lessee one site of not more than
five acres in size for a facility or facilities for the generation of electric
power and/or the processing of geothermal resources or by-products thereof. The
location of said site shall be submitted to Lessor for his consent and approval
as provided for in paragraph 7 above in the same manner as though said site
constituted "Occupied Land". In such event, Lessee shall purchase said site,
paying to the Lessor the fair market value thereof. Said fair market value shall
be based upon the highest and best use of said site notwithstanding the fact
that the same may then be devoted to agricultural purposes. If the parties
cannot agree upon the fair market value of such land within 30 days after
exercise of Lessee's option, such value shall be determined by three qualified
appraisers, one to be selected by each of the parties and the third by any judge
of the Imperial County Superior Court. The rules of the American Arbitration
Association shall apply and be binding upon the parties as to any such
valuation. In the event of such sale Lessor shall retain all geothermal and
mineral rights under said site.

     10. Lessee shall pay to Lessor as royalty *** hereof. Should Lessee process
its *** before sale, Lessor's royalties shall bear its proportionate share of
***. Lessee shall pay to Lessor said royalty on the 25th day of each month for
accrued royalties for the preceding calendar month. Lessee shall have the right
to co-mingle the geothermal resources and other substances produced from the
leased land or lands pooled therewith with such substances produced from other
lands

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

                                       5

and to pay Lessor's royalty on the basis of production allocable to the leased
land as determined by metering or gauging same. Lessee shall not be required to
account to the Lessor for, or pay royalty on, any product produced by Lessee
from said land and used by it in its operations hereunder. Except for taxes
chargeable to Lessor no deduction from royalties due Lessor will be made without
written approval of Lessor, except as herein provided.

     11. It is understood and agreed by and between the parties hereto that at
any time during the primary term of this Agreement if Lessee shall acquire by
purchase or assignment an interest in any lease executed after the date of this
Agreement and covering lands located within five miles of the land covered
hereby, which lease shall contain a greater Lessor's royalty or a greater annual
per acre rental than is provided by this Agreement, the Lessee shall immediately
increase the corresponding terms of this Agreement so as to afford the Lessor
herein equal terms. In the event of such increase, the Lessee shall promptly
tender to the Lessor for his execution an instrument in writing which shall
contain such increased terms.

     12. In valuing amounts realized or received by Lessee for any thing or
substance sold, utilized or disposed of by Lessee upon which royalty is payable
to Lessor, such amount in no event shall be less than would be obtained as
between parties dealing at arms length and not under substantial common control.

     13. If the Lessor or any party Lessor owns a less interest in the
geothermal resources or by-products hereunder than the entire and undivided fee
estate therein, then

                                       6

the royalty and rental herein provided shall be paid the Lessor or such party
Lessor only in the proportion which his ownership bears to the whole and
undivided fee.

     14. Lessee may, at any time during the life of this Lease, pool, unitized
or combine all or any part of the leased land into a unit (hereinafter called
"Unit") with any other land or lands or leases adjacent, adjoining or in the
immediate vicinity of the leased land for drilling, development, producing or
operating purposes, provided that the total acreage within any such drilling or
operating unit shall not exceed 5,120 acres, plus or minus 10%. Such a Unit
shall be created upon Lessee's filing with the County Recorder, in the county
where the leased land is located, a notice or declaration of creation of such
unit, describing the lands and acreage to be embraced there, and the names of
the lessors and the dates of the respective leases covering such lands. Notice
of and a copy of the creation of a Unit shall be sent to Lessor.

     15. Production as to which royalty is payable from any wells drilled upon
any such Unit, whether located upon the leased land or other lands, shall be
credited 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. The royalty paid as
herein provided shall be deemed to be the royalty payable to Lessor with respect
to the leased lands hereunder, and all drilling, developing, producing or other
operation by Lessee on any of the unitized land shall for purposes of this
Lease, be deemed to be performed on the leased land.

     16. The obligations of Lessee hereunder shall be suspended, and the Primary
Term shall be extended until expiration of ninety (90) days after removal of
cause for

                                       7

suspension, while the Lessee is prevented or delayed from complying therewith,
in whole or in part, by strikes, lockouts, actions of the elements, accidents,
inability to obtain services or equipment, rules, regulations or restrictions of
any federal, state, municipal or other governmental entity or agency, procedures
relating to environmental matters, the delay in issuance of permits to Lessee
required with respect to any of Lessee's operations hereunder, provided that
application for any such permits shall have been made not less than 30 days
prior to the time for performing any act required of Lessee hereunder or matters
or conditions beyond the reasonable control of the Lessee (including, but not
limited to, inability to obtain a market for the geothermal resources produced
from the leased land) whether or not similar to the matters or conditions herein
specifically enumerated.

     17. Lessee will keep Occupied Land in a clean and weed-free condition at
all times. If Lessor so desires, he may do the work required and bill Lessee for
his actual costs.

     18. Lessee agrees to put forward its best efforts in overcoming obstacles
that may prevent or delay the expeditious and successful geothermal development
of the leased lands.

     19. The Lessee shall pay all property taxes on its improvements and
property and ninety percent (90%) of the taxes if any, levied against Geothermal
Resources rights and rights as to other products covered by this lease. Lessor
shall pay all taxes levied and assessed against the land as such and Lessor's
property and ten percent (10%) of the taxes

                                       8

levied and assessed against Geothermal Resources rights and rights as to other
products covered by this lease. In the event the State, United States, or any
municipality or other governmental agency levies a license, severance,
production or other tax on the products hereunder, or on Lessee's right to
operate or produce or sell products, then and in that event the Lessee shall pay
ninety percent (90%) of such tax and Lessor shall pay ten percent (10%) thereof.
Lessee is hereby authorized to pay any taxes and assessments on behalf of Lessor
and may, if it so desires, deduct the amount so paid from royalties or monies
due Lessor hereunder. Any taxes (other than taxes on the leased land as such and
Lessor's improvements), a portion of which are chargeable to Lessor under this
Lease, which are levied against the Unit or the pooled lands as a Unit, shall be
chargeable to Lessor only in the proportion thereof that the share of production
from such Unit is allocated to the leased land.

     20. In the event any taxes are levied or assessed against Geothermal
Resources rights or rights as to other products covered by this lease prior to
the production and sale of geothermal resources or by-products thereof, then
Lessee shall pay all said taxes levied and assessed against said rights for
Lessor's account, until such time as geothermal resources or any of the
substances covered by the lease are produced and sold in commercial quantities.

     21. The Lessee or the owner thereof shall have the right at any time to
remove from said land all machinery, equipment, pipes, casing, structures and
other property and improvements belonging to or placed on the land by or under
agreement with the Lessee,

                                       9

providing that such removal shall be completed no later than a reasonable time
after the termination of this lease . Lessee agrees after termination of this
lease to return said land to as near its original condition as is practical.

     22. If Lessee shall violate any provision, condition or covenant hereof,
Lessee shall take corrective action to diligently remedy such violation within
60 days of written notice thereof by Lessor. If Lessee shall fail to do so,
Lessor at his option may cancel this lease by written notice to Lessee, and all
rights of the Lessee in and to said land shall be at an end, save and excepting
each well completed or being drilled and one surrounding each such well, and
saving and excepting rights of way, easements, surface areas and ingress and
egress to surface areas necessary for Lessee's operation for operation and
maintenance of such wells and operation and maintenance of electric generating
and power transmission facilities or other facilities for utilization or
processing of other products covered hereby, and as to which the person or
persons owning or operating such facilities are not in default under the
agreement or agreements pursuant to which such facilities were installed on the
leased land. If, upon termination of this lease, Lessee does not, within 30 days
thereafter, leave the leased land in a clean and farmable condition and remove
from said land all machinery, equipment, pipes, structures and other property or
improvements placed on the land by Lessee and not permitted to remain thereon,
then Lessor shall have the right to remove all such items and Lessee will pay to
Lessor actual cost for such removal and disposal.

                                       10

     23. Lessee may, at any time and upon payment of the sum of $10.00 to Lessor
as and for fixed and liquidated damages, quitclaim to the Lessor all of the
right, title and interest of Lessee in and to the leased lands or any part
thereof, and thereupon all rights and obligations of the parties hereto one to
the other shall cease and terminate as to the premises quitclaimed, except:

     a. No quitclaim shall relieve Lessee of any debt or obligation for the
payment of money due Lessor at time of quitclaim, or any indemnity or old
harmless obligation in Lessor's favor or any obligation of Lessee to restore or
repair the land quitclaimed in accordance with the provisions of this lease.

     b. Quitclaims will not reduce Lessor's percentage in a unit formed prior to
date of quitclaim; and, in the event no Unit has been created, will not reduce
the royalty payments to which he would otherwise be entitled.

     24. In the event of any litigation under this lease, the prevailing party
shall be entitled to reasonable attorney's fees and costs of suit as fixed by
the court.

     25. This Lease and Agreement supersedes that certain lease and agreement
between the parties dated December 10, 1971, a short form of which was recorded
in Book 1321, Page 1194, Official Records of Imperial County, California. It is
understood and agreed that the wells, property, facilities and improvements
heretofore drilled or placed on the leased land by Lessee under said lease and
agreement dated December 10, 1971, are and shall continue to be the property of
Lessee and subject to the provisions of this Lease and Agreement.

                                       11

     26. This lease and all its terms, conditions and provisions shall extend to
and be binding upon the heirs, executors, administrators, grantees, successors
and assigns of the parties hereto.

     27. Any notice from the Lessor to the Lessee must be given by sending the
same by registered or certified mail, postage prepaid, addressed to the office
of Lessee at 631 South Witmer Street, Los Angeles, California 90017; and any
notice from the Lessee to Lessor must be given in the same manner addressed to
the Lessor at 1550 Orange Avenue, El Centro, California 92243. The parties may,
upon notice, change their said respective addresses for notice.

/s/ Walter J. Holtz
---------------------------------
Walter J. Holtz

                                              MAGMA ENERGY, INC.

                                              By: /s/ B.C. McCabe
                                                 -------------------------------
                                              B.C. McCabe              President

                                              By: /s/ Joseph W. Aidlin
                                                 -------------------------------
                                              Joseph W. Aidlin         Secretary

                                       12

                                    EXHIBIT A

     The land which is the subject of the herein Geothermal Lease and Agreement
is that certain land situate in the County of Imperial, State of California,
more particularly described as follows, to wit:

     Tract 40, Township 16 South, Range 14 East, S. B. M. in
     the County of Imperial, State of California, as per Map of
     the re-survey, approved and filed in the United States Land
     Office at Los Angeles, California.

     EXCEPTING THEREFROM that portion thereof described as follows:

     BEGINNING at the Northwest Corner of said Tract 40;
     Thence East along the North line thereof, 208.72 feet;
     Thence South 208.72 feet; thence West 208.72 feet to a
     point in the West line of said Tract 40; Thence North along
     said West line, 208.72 feet to the Point of Beginning.

     Including all rights in and under easements, roadways and canals
appurtenant to the said land.

                                       13

Recording Requested by

NEW ALBION RESOURCES CO.

When Recorded Return To:

NEW ALBION RESOURCES CO.
P.O. Box 168
San Diego, California 92112

Fee
$7.00

                   AMENDMENT TO GEOTHERMAL LEASE AND AGREEMENT

     This Amendment to Geothermal Lease and Agreement ("Amendment") is entered
into this 14th day of April, 1982, by and between WALTER J. HOLTZ ("Holtz") and
NEW ALBION RESOURCES CO., a California corporation ("NARCO"), with reference to
the following facts:

     A. On February 15, 1977, Holtz entered into a "Geothermal Lease and
Agreement" (the "Holtz Lease") with Magma Energy, Inc , a corporation, for the
lands therein described, to explore for, drill for, develop, mine, produce and
utilize geothermal resources and by-products and products associated therewith.
A short form of the Holtz Lease was recorded April 29, 1977, at Book 1400, Page
1487 of Official Records of Imperial County, California. The Holtz Lease was
assigned by Magma Energy, Inc , to NARCO by "Assignment of Interest in Lease,"
dated February 15, 1978, and recorded February 22, 1978, at Book 1412, Page 1083
of Official Records of Imperial County, California.

                                       14

     B. The "primary term" of the Holtz Lease is for a period of five years,
commencing February 15, 1977.

     C. The parties desire to extend the primary term of the Holtz Lease for an
additional one-year period, commencing February 15, 1982, and amend the Holtz
Lease in other respects.

     NOW, THEREFORE, in consideration of the promise of rent to be paid, the
mutual covenants of the parties herein contained, and other good and valuable
consideration, the parties agree as follows:

     1. The "primary term" of the Holtz Lease, set forth in Paragraph 3 of said
lease, is hereby extended for a twelve-month period commencing February 15,
1982, and terminating at Midnight, February 14, 1983.

     2. The following is hereby added to the Holtz Lease as Paragraph 28
thereof:

     "28. Subject to Lessor's right under Paragraph 6 hereof
     and notwithstanding anything else to the contrary
     contained herein, or in the Holtz Lease, if Lessee
     completes a well or wells or a processing plant on the
     leased lands or on the Unit area capable of producing
     or processing Geothermal Resources in quantities and
     quality deemed paying quantities by Lessee, Lessee may
     continue to pay or tender to Lessor, annually in
     advance of each lease anniversary date, rental until
     Lessee has made a sale of Geothermal Resources produced
     from or allocated to the leased lands. So long as such
     annual rental payments are paid or tendered, this Lease
     shall remain in force and effect even though extended
     thereby beyond the primary term, and all payments so
     paid or tendered after the expiration of said primary
     term shall be deemed advance royalties, and so long as
     same are paid, each well or wells shall be deemed to be
     actually producing Geothermal Resources in paying

                             15

     quantities under the terms hereof. The entire amount of
     any such advance royalty(ies) paid to Lessor may be
     retained by Lessor and shall not be subject to
     recapture by Lessee. Lessee agrees to exercise due
     diligence in the development and drilling of wells and
     the production of Geothermal Resources in paying
     quantities; provided, however, that Unit Operations
     conducted under the terms of the Heber Geothermal Unit
     Agreement, recorded in Book 1437, Page 1272, Imperial
     County, California, without a cessation of 180
     consecutive days for reasons other than those stated in
     Article 14 of said Unit Agreement, shall be considered
     as due diligence under this Paragraph 28.

     3. Notwithstanding any provision herein or in the Holtz Lease to the
contrary, and notwithstanding extension hereby of the "primary term" of the
Holtz Lease (i) the five (5) year period described in Paragraph 6 of the Holtz
Lease shall not be hereby extended beyond February 15, 1987, as originally set
forth in the Holtz Lease, and (ii) Paragraph 11 of the Holtz Lease shall remain
in full force and effect throughout the primary term as extended hereby.

     4. The signature original of this Amendment may be filed for recordation by
either party in the Office of the County Recorder for Imperial County,
California.

     5. This Amendment to Geothermal Lease and Agreement shall bind and inure to
the benefit of the respective heirs, executors, administrators, successors and
assigns of the parties hereto.

     6. The Holtz Lease as hereby amended is confirmed.

     The parties have executed this Amendment to Geothermal Lease and Agreement
at San Diego, California, as of the date sat forth at the beginning hereof.

                                       16

                                                    /s/ Walter J. Holtz
                                                 -------------------------------
                                                        WALTER J. HOLTZ

                                                 NEW ALBION RESOURCES CO.,
                                                 a California corporation

                                                 By: /s/ Indecipherable
                                                    ----------------------------
                                                                  Vice President

                                                 Attest:

                                                 /s/ Indecipherable
                                                 -------------------------------
                                                                       Secretary

                                       17

                   AMENDMENT of GEOTHERMAL LEASE AND AGREEMENT

     THIS AGREEMENT, made this 14th day of March, 1986, between the party or
parties whose names are subscribed hereto under the designation of "Lessor",
hereinafter called "Lessor" (whether one or more), and CHEVRON GEOTHERMAL
COMPANY OF CALIFORNIA AND UNION OIL COMPANY OF CALIFORNIA, hereinafter called
"Lessee",

                              W I T N E S S E T H :

     THAT, REFERENCE IS HEREBY HAD to that certain Geothermal Lease and
Agreement dated February 15, 1977 (a short form of such lease being of record in
the Office of the County Recorder of Imperial County, California, in Book 1400,
at Page 1487 et seq., of Official Records), whereby Lessor did grant, let and
lease unto Magma Energy, Inc., a predecessor in interest to Lessee for the
purposes therein described certain lands situate in said County and State
particularly described in such lease and agreement, such lease and agreement
being hereinafter referred to as "said lease";

     AND, WHEREAS, by assignment dated February 15, 1978, recorded in Book 1412,
Page 1083 of said official records, Mamga Energy, Inc. assigned its interest in
said lease to New Albion Resources Co. ("NARCO");

     AND, WHEREAS, by asignment dated April 14, 1982, recorded in Book 1483,
page 678 of said official records, said lease was amended;

                                       18

     AND, WHEREAS, by assignment dated April 14, 1982, a memorandum of which was
recorded in Book 1488, Page 1749 of said official records, Narco assigned its
interest in said lease to Union Oil Company of California, ("UNION");

     AND, WHEREAS, by assignment dated September 1, 1982, a memorandum of which
was recorded in Book 1493, Page 601 of said official records, Union assigned a
67,238 percent undivided interest in said lease to Chevron Geothermal Company of
California;

     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. The last sentence of Paragraph 8 of said lease which now reads as
follows: shall be and hereby is amended to read as follows:

     "The parties acknowledge that said farming rental is $*** per acre
     effective February 15, 1985. Commencing with the rental period that begins
     in 1986, the annual rental payment for occupied land for succeeding annual
     periods shall be determined by the increase, if any, in the *** as compared
     to the calendar month in which the 1985 rental payment was made ("Beginning
     Index"). In the event the Ending Index is a number greater than the
     Beginning Index, the amount of said rental payment shall be increased in
     the same ratio that the Ending Index bears to the Beginning Index."

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

                                       19

     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 February 15, 1988.

     3. 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

CHEVRON GEOTHERMAL COMPANY OF CALIFORNIA

By /s/ J.W. Davis
   ------------------------------------
   J.W. Davis, Vice-President

UNION OIL COMPANY OF CALIFORNIA

By /s/ Carol Otte
   ------------------------------------
   ITS ATTORNEY-IN-FACT
   CAREL OTTE

LESSOR

/s/ Walter J. Holtz
---------------------------------------
    WALTER J. HOLTZ

/s/ Toni F. Holtz
---------------------------------------
    TONI F. HOLTZ

                                       20

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