Document:

EXHIBIT 10.23b

                 FIRST AMENDMENT TO THE UNITED ILLUMINATING COMPANY
                              1990 STOCK OPTION PLAN

This FIRST AMENDMENT,  effective  immediately  prior to the close of business on
the 20th day of July, 2000, to The United Illuminating Company 1990 Stock Option
Plan, as adopted January 22, 1990, (the "Plan"),

                              WITNESSETH THAT:

(1)  Pursuant to Section 10. of the Plan,  it is amended as set forth in Section
(2) below.

(2)  Section 6. is amended by adding  thereto  the following  sentence:  "In the
event of any  reorganization  in which all of the shares of the Company's Common
Stock are exchanged for shares of the common stock of another  corporation,  all
Stock Options  granted  hereunder and  outstanding  on the effective date of the
share exchange shall be  automatically  converted into stock options to purchase
shares of the other  corporation on identical terms,  and the other  corporation
shall assume this Plan,  and the Board of  Directors  of the other  corporation,
excluding any member of said Board who is, or within twelve (12) months prior to
the exercise of any discretion under this Plan has been an employee of the other
corporation,  its subsidiaries,  the Company or its  Subsidiaries,  shall be and
become  the  Administrator  of this  Plan  on the  effective  date of the  share
exchange."

(3) All the terms and conditions of the Plan, as amended  hereby,  are and shall
remain in full force and effect.

THE UNITED ILLUMINATING COMPANY

By    /s/Albert N. Henricksen
      --------------------------
      Albert N. Henricksen
      Its Group Vice President
      Support ServicesEXHIBIT 10.23c
                                                            EXHIBIT 10.24a

                           INSTRUMENT OF ASSUMPTION OF
                               STOCK OPTION PLANS

         This  Instrument of Assumption  of Stock  Options (the  "Instrument  of
Assumption"),  made  as  of  the  21st  day  of  July,  2000,  by  UIL  Holdings
Corporation,   a  Connecticut   corporation  ("UIL")  in  favor  of  The  United
Illuminating Company, a Connecticut corporation ("UI"),

                               WITNESSETH THAT:

         WHEREAS,  effective  at the close of  business  on July 20,  2000,  and
pursuant  to an  Agreement  and Plan of Merger and Share  Exchange,  dated as of
January  24,  2000,  among  UIL,  UI and  United  Mergings,  Inc.,  UI  became a
wholly-owned  subsidiary of UIL, and each outstanding share of UI's Common Stock
was  automatically  converted  into and  exchanged for one share of UIL's Common
Stock; and

         WHEREAS,  UI has had in effect  since  January  22,  1990 a 1990  Stock
Option Plan for certain of its key employees, which Plan, as amended immediately
prior to the  close of  business  on the 20th day of July,  2000,  includes  the
following  provision:  "In the event of any  reorganization  in which all of the
shares of the  Company's  Common  Stock are  exchanged  for shares of the common
stock  of  another   corporation,   all  Stock  Options  granted  hereunder  and
outstanding on the effective  date of the share exchange shall be  automatically
converted  into stock  options to purchase  shares of the other  corporation  on
identical terms, and the other corporation shall assume this Plan, and the Board
of Directors of the other  corporation,  excluding  any member of said Board who
is, or within twelve (12) months prior to the exercise of any  discretion  under
this Plan, has been an employee of the other corporation, its subsidiaries,  the
Company or its Subsidiaries,  shall become the Administrator of this Plan on the
effective date of the share exchange."; and

         WHEREAS, UI has had in effect since March 22, 1999, a 1999 Stock Option
Plan,  which  Plan  includes  the  following  provision:  "In the  event  of any
reorganization  in which all of the  shares of the  Company's  Common  Stock are
exchanged  for shares of the  common  stock of  another  corporation,  all Stock
Options  granted  hereunder and  outstanding  on the effective date of the share
exchange shall be automatically  converted into stock options and reload options
to purchase shares of the other  corporation on identical  terms,  and the other
corporation  shall  assume this Plan,  and the Board of  Directors  of the other
corporation,  excluding  any member of said Board who is, or within  twelve (12)
months  prior to the  exercise of any  discretion  under this Plan has been,  an
employee  of  the  other  corporation,  its  subsidiaries,  the  Company  or its
Subsidiaries,  shall become the Administrator of this Plan on the effective date
of the share exchange."

         NOW  THEREFORE,   in   consideration   of  the  premises,   UIL  hereby
acknowledges  that it has assumed and become  responsible for the performance of
all of the terms, conditions,  covenants and agreements of each of the aforesaid
Stock Option Plans on the part of UI thereunder,  including, without limitation,
the obligation to issue shares of

<PAGE>

Common Stock of UIL upon the exercise of Stock  Options (as that term is defined
in said Stock Option  Plans),  pursuant to and in accordance  with the terms and
conditions of said Stock Option Plans; and UIL does hereby covenant and agree to
hold harmless UI from and against any claims, demands,  suits, actions,  damages
or expenses,  including but not limited to attorneys' fees, arising out of or in
any way connected with any default or alleged  default on the part of UIL in the
faithful  performance  of  the  terms,  conditions,   covenants  and  agreements
contained in said Stock Option Plans.

         This  Instrument  of  Assumption  shall be governed by and construed in
accordance with the laws of the State of Connecticut.

         IN WITNESS WHEREOF,  UIL has caused this Instrument of Assumption to be
executed as of the day and year first above written.

UIL HOLDINGS CORPORATION

By:      s/s Robert L. Fiscus
    ------------------------------------------------
    Robert L. Fiscus
    Its Vice Chairman of the Board of Directors,
    Chief Financial Officer, Treasurer and Secretary

                                   2EXHIBIT 10.25c

               SECOND AMENDMENT TO THE UNITED ILLUMINATING COMPANY
                       NON-EMPLOYEE DIRECTORS COMMON STOCK
                         AND DEFERRED COMPENSATION PLAN

This SECOND AMENDMENT, made as of the close of business on the 20th day of July,
2000, to The United Illuminating Company Non-Employee Directors Common Stock and
Deferred  Compensation  Plan,  as originally  adopted on December 22, 1980,  and
previously amended and restated on July 23, 1990,  December 17, 1990 and May 15,
1996, and further amended effective December 13, 1999, (the "Plan"),

                               WITNESSETH THAT:

(1)       Pursuant to Section  8.01 of  the  Plan, it is amended as set forth in
Sections (2), (3), (4) and (5) below.

(2)      Section 1.01 is amended to read as follows:

         1.01 THE PLAN. This  Non-Employee  Directors  Common Stock and Deferred
         Compensation  Plan (the "Plan"),  is established for the benefit of the
         Eligible Directors of UIL Holdings Corporation (the "Company").

(3)      Subsection 2.01(f) is amended to read as follows:

         (f) "Company" shall mean UIL Holdings Corporation and any successor.

(4)      Subsection 2.01(i) is amended to read as follows:

         (i)  "Eligible  Director"  shall  mean  a  person  who  renders  or has
              rendered service to the Company or The United Illuminating Company
              on or after May 15, 1996 at a time when he or she is or was not an
              employee of the Company or The United Illuminating Company.

(5)      Subsection 2.01(p) is amended to read as follows:

         (p)  "Service" shall mean service as a Director, including service as a
              member of a committee or committees of the Board, and service as a
              member of the Board of Directors, including service as a member of
              a committee or committees of the Board of Directors, of The United
              Illuminating Company.

<PAGE>

(6)      All  the  terms  and  condition of the Plan, as amended hereby, are and
shall remain in full force and effect.

THE UNITED ILLUMINATING COMPANY

By    /s/ Albert N. Henricksen
      -------------------------------
      Albert N. Henricksen
      Its Group Vice President
      Support Services

                                          2EXHIBIT 10.25d

                          INSTRUMENT OF ASSIGNMENT AND
                           ASSUMPTION OF NON-EMPLOYEE
                           DIRECTORS COMMON STOCK AND
                           DEFERRED COMPENSATION PLAN

         THIS INSTRUMENT (the "Assignment and Assumption Agreement"), made as of
the 21st day of July, 2000, by and between The United  Illuminating  company,  a
Connecticut  corporation  (the  "Assignor"),  and UIL  Holdings  Corporation,  a
Connecticut corporation (the "Assignee").

                               WITNESSETH THAT:

         WHEREAS,  effective  at the close of  business  on July 20,  2000,  and
pursuant  to an  Agreement  and Plan of Merger and Share  Exchange,  dated as of
January 24, 2000, among Assignor,  Assignee and United Mergings,  Inc., Assignor
became a  wholly-owned  subsidiary of Assignee,  and each  outstanding  share of
Assignor's Common Stock was  automatically  converted into and exchanged for one
share of Assignee's Common Stock; and

         WHEREAS,  effective  at the close of  business on July 20,  2000,  each
non-employee Director of Assignor was duly elected a Director of Assignee; and

         WHEREAS,  Assignor  has  had  in  effect  since  December  22,  1980  a
compensation  plan for its  non-employee  Directors,  which plan, as amended and
restated on July 23, 1990,  December 17, 1990, May 15, 1996,  December 13, 1999,
and as of the close of business on July 20,  2000,  has provided for the payment
to  non-employee  Directors  of Assignor of portions of their  compensation  for
service as  Directors  in shares of  Assignor's  Common  Stock,  and has allowed
non-employee  Directors  of  Assignor  to defer the  payment of part of the fees
payable  to them for  service as  Directors  of  Assignor,  all as set forth and
described in said Non-Employee  Directors Common Stock and Deferred Compensation
Plan, as amended and restated (the "Plan"); and

         WHEREAS,  the Plan,  as  amended by said  amendment  as of the close of
business on July 20, 2000, has become the Plan of Assignee; and

         WHEREAS, Assignor desires to assign and Assignee desires to assume, all
of  Assignor's  right and  interest  in and to, and all of the  obligations  and
liabilities arising out of the Plan,

         NOW THEREFORE, in consideration of the premises,  Assignor and Assignee
hereby agree as follows:

     1.  Assignor  assigns,  transfers  and delivers to  Assignee,  and Assignee
hereby assumes,  all of Assignor's  right and interest in and to, and all of the
obligations and liabilities arising out of, the Plan.

<PAGE>

     2.  Assignee  assumes and agrees to perform  all of the terms,  conditions,
covenants and agreements of the Plan on the part of the Company (as that term is
defined in the Plan) thereunder,  including, without limitation, all obligations
of Assignor to individuals  who have served as Directors of Assignor at any time
since December 22, 1980, and to their beneficiaries, spouses, legal guardians or
conservators;  and  Assignee  does hereby  covenant  and agree to hold  harmless
Assignor  from and against  any  claims,  demands,  suits,  actions,  damages or
expenses, including but not limited to attorneys' fees, arising out of or in any
way  connected  with any  default or alleged  default on the part of Assignee in
faithful  performance  of  the  terms,  conditions,   covenants  and  agreements
contained in the Plan.

     3. This  Assignment  and  Assumption  Agreement  may not be modified in any
manner or terminated, except by an instrument in writing executed by the parties
hereto.

     4. This  Assignment  and  Assumption  Agreement  shall be  governed  by and
construed in accordance with the laws of the State of Connecticut.

         IN WITNESS  WHEREOF,  the  parties  have  caused  this  Assignment  and
Assumption Agreement to be executed as of the day and year first written above.

ASSIGNOR:
THE UNITED ILLUMINATING COMPANY

By:  /s/ Robert L. Fiscus
     ------------------------------------------------
      Robert L. Fiscus
      Its:  Vice Chairman of the Board of Directors
            and Chief Financial Officer

And by:  /s/ Charles J. Pepe
         --------------------------------------------
           Charles J. Pepe
           Its:  Treasurer

ASSIGNEE:
UIL HOLDINGS CORPORATION

By:  /s/Robert L. Fiscus
     ------------------------------------------------
      Robert L. Fiscus
      Its:  Vice Chairman of the Board of Directors
            Chief Financial Officer, Treasurer and
            Secretary

                                        2

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