Exhibit 4



---

KANSAS GAS AND ELECTRIC COMPANY

TO

BNY MIDWEST TRUST COMPANY

(successor to Harris Trust and Savings Bank)

and

JUDITH L. BARTOLINI

(successor to W. A.
Spooner, Henry A. Theis, Oliver R. Brooks,

Wesley L. Baker, Edwin F. McMichael and R. Amundsen)

as Trustees under Kansas Gas and Electric Companys

Mortgage and Deed of Trust, Dated as of April 1, 1940

FORTY- SIXTH SUPPLEMENTAL INDENTURE

Providing, among other things, for

First Mortgage Bonds, Burlington Series 2004B-1 Due 2031

First Mortgage Bonds, Burlington Series 2004B-2 Due 2031

Dated as of June 1, 2006



---



---

FORTY-SIXTH SUPPLEMENTAL INDENTURE

INDENTURE, dated as of June 1, 2006, between KANSAS GAS AND ELECTRIC COMPANY, a corporation of the State of Kansas (formerly named KCA Corporation and
successor by merger to Kansas Gas and Electric Company, a corporation of the State of Kansas, hereinafter sometimes called the Company-Kansas), whose post office address is 120 East First Street, Wichita, Kansas 67202 (hereinafter
sometimes called the Company), and BNY Midwest Trust Company, a corporation of the State of Illinois, whose post office address is 2 North LaSalle Street, Suite 1020, Chicago, Illinois 60602 (successor to Harris Trust and Savings Bank
(the Corporate Trustee)), and JUDITH L. BARTOLINI (successor to W.A. Spooner, Henry A. Theis, Oliver R. Brooks, Wesley L. Baker, Edwin F. McMichael and R. Amundsen, and being hereinafter sometimes called the
Individual Trustee), whose post office address is 2 North LaSalle Street, Suite 1020, Chicago, Illinois 60602 (the Corporate Trustee and the Individual Trustee being hereinafter together sometimes called the Trustees), as
Trustees under the Mortgage and Deed of Trust, dated as of April 1, 1940 (hereinafter called the Mortgage), which Mortgage was executed and delivered by Kansas Gas and Electric Company, a corporation of the State of West Virginia to
which the Company-Kansas was successor by merger (hereinafter sometimes called the Company-West Virginia), to secure the payment of bonds issued or to be issued under and in accordance with the provisions of the Mortgage, reference to
which Mortgage is hereby made, this Indenture (hereinafter sometimes called the Forty-sixth Supplemental Indenture) being supplemental thereto;

WHEREAS, the Company-West Virginia caused the Mortgage to be filed for record as a mortgage of real property and as a chattel mortgage in the offices of the Registers of Deeds in various counties in the State of
Kansas, and on April 25, 1940 paid to the Register of Deeds of Sedgwick County, Kansas, that being the County in which the Mortgage was first filed for record, the sum of $40,000 in payment of the Kansas mortgage registration tax as provided by
Section 79-3101 et seq.,General Statutes of Kansas 1935; and

WHEREAS, by the Mortgage, the Company-West Virginia covenanted
that it would execute and deliver such supplemental indenture or indentures and such further instruments and do such further acts as might be necessary or proper to carry out more effectually the purposes of the Mortgage and to make subject to the
lien of the Mortgage any property thereafter acquired, intended to be subject to the lien thereof; and

WHEREAS, an instrument, dated May
31, 1949, was executed by the Company-West Virginia appointing Oliver R. Brooks as Individual Trustee in succession to said Henry A. Theis, resigned, under the Mortgage, and by Oliver R. Brooks accepting the appointment as Individual Trustee under
the Mortgage in succession to said Henry A. Theis, which instrument was filed for record in the offices of the Registers of Deeds in various counties in the State of Kansas; and

WHEREAS, an instrument, dated March 3, 1958, was executed by the Company-West Virginia appointing Wesley L. Baker as Individual Trustee in succession to
said Oliver R. Brooks, resigned, under the Mortgage, and by Wesley L. Baker accepting the appointment as Individual Trustee under the Mortgage in succession to said Oliver R. Brooks, which instrument was filed for record in the offices of the
Registers of Deeds in various counties in the State of Kansas; and



---

WHEREAS, an instrument, dated November 20, 1969, was executed by the Company-West Virginia appointing
Edwin F. McMichael as Individual Trustee in succession to said Wesley L. Baker, resigned, under the Mortgage, and by Edwin F. McMichael accepting the appointment as Individual Trustee under the Mortgage in succession to said Wesley L. Baker, which
instrument was filed for record in the offices of the Registers of Deeds in various counties in the State of Kansas; and

WHEREAS, by the
Twenty-seventh Supplemental Indenture mentioned below, the Company-Kansas, among other things, appointed R. Amundsen as Individual Trustee in succession to said Edwin F. McMichael, resigned, under the Mortgage, and by R. Amundsen accepting the
appointment as Individual Trustee under the Mortgage in succession to said Edwin F. McMichael; and

WHEREAS, by the Thirty-second
Supplemental Indenture mentioned below, the Company-Kansas, among other things, appointed W. A. Spooner as Individual Trustee in succession to said R. Amundsen, resigned, under the Mortgage, and by W. A. Spooner accepting the appointment as
Individual Trustee under the Mortgage in succession to said R. Amundsen; and

WHEREAS, by the Fortieth Supplemental Indenture mentioned
below, the Company-Kansas, among other things, appointed Judith L. Bartolini as Individual Trustee in succession to said W.A. Spooner resigned, under the Mortgage, and by Judith L. Bartolini accepting the appointment as Individual Trustee under the
Mortgage in succession to said W.A. Spooner; and

WHEREAS, the Company-West Virginia executed and delivered to the Trustees a First
Supplemental Indenture, dated as of June 1, 1942 (which supplemental indenture is hereinafter sometimes called the First Supplemental Indenture); and

WHEREAS, the Company-West Virginia caused the First Supplemental Indenture to be filed for record as a mortgage of real property and as a chattel mortgage in the offices of the Registers of Deeds in various counties
in the State of Kansas, but paid no mortgage registration tax in connection with the recordation of the First Supplemental Indenture, no such tax having been payable in connection with such recordation; and

WHEREAS, the Company-West Virginia executed and delivered to the Trustees the following supplemental indentures:



|                                |  |             |  |                  |  | 
|------------------------------- |  | ----------- |  | ---------------- |  | 
|Designation                     |  | Dated as of |  |                 
|Second Supplemental Indenture   |  |             |  | March 1, 1948   
|Third Supplemental Indenture    |  |             |  | December 1, 1949
|Fourth Supplemental Indenture   |  |             |  | June 1, 1952    
|Fifth Supplemental Indenture    |  |             |  | October 1, 1953 
|Sixth Supplemental Indenture    |  |             |  | March 1, 1955   
|Seventh Supplemental Indenture  |  |             |  | February 1, 1956
|Eighth Supplemental Indenture   |  |             |  | January 1, 1961 
|Ninth Supplemental Indenture    |  |             |  | May 1, 1966     
|Tenth Supplemental Indenture    |  |             |  | March 1, 1970   
|Eleventh Supplemental Indenture |  |             |  | May 1, 1971     
|Twelfth Supplemental Indenture  |  |             |  | March 1, 1972   



-3-



---

which supplemental indentures are hereinafter sometimes called the Second through Twelfth Supplemental Indentures,
respectively; and

WHEREAS, the Company-West Virginia caused the Second through Eighth Supplemental Indentures to be filed for record as a
mortgage of real property and as a chattel mortgage in the offices of the Registers of Deeds in various counties in the State of Kansas, and caused the Ninth through Twelfth Supplemental Indentures to be filed for record as a mortgage of real
property in the offices of the Registers of Deeds in various counties in the State of Kansas and as a chattel mortgage in the Office of the Secretary of State of Kansas, and on the following dates paid to the Register of Deeds of Sedgwick County,
Kansas, that being the County in which the Second through Twelfth Supplemental Indentures were first filed for record as a mortgage of real property, the following amounts:



|                 |  |        |       
|---------------- |  | ------ | ------
|Date             |  | Amount
|March 30, 1948   |  | $      | 12,500
|December 7, 1949 |  |        | 7,500 
|June 17, 1952    |  |        | 30,000
|October 21, 1953 |  |        | 25,000
|March 22, 1955   |  |        | 25,000
|March 5, 1956    |  |        | 17,500
|January 24, 1961 |  |        | 17,500
|May 17, 1966     |  |        | 40,000
|March 10, 1970   |  |        | 87,500
|May 19, 1971     |  |        | 87,500
|March 23, 1972   |  |        | 62,500

such amounts being in payment of the Kansas mortgage registration tax as provided by the then currently applicable
sections of the statutes of the State of Kansas in effect on those dates; and

WHEREAS, the Company-West Virginia was merged into the
Company-Kansas on May 31, 1973; and

WHEREAS, in order to evidence the succession of the Company-Kansas to the Company-West Virginia and
the assumption by the Company-Kansas of the covenants and conditions of the Company-West Virginia in the bonds and in the Mortgage contained, and to enable the Company-Kansas to have and exercise the powers and rights of the Company-West Virginia
under the Mortgage in accordance with the terms thereof, the Company-Kansas executed and delivered to the Trustees a Thirteenth Supplemental Indenture, dated as of May 31, 1973 (which supplemental indenture is hereinafter sometimes called the
Thirteenth Supplemental Indenture); and



-4-



---

WHEREAS, the Company-Kansas caused the Thirteenth Supplemental Indenture to be filed for record as a
mortgage of real property in the offices of the Registers of Deeds in various counties in the State of Kansas and as a chattel mortgage in the Office of the Secretary of State of Kansas, but paid no mortgage registration tax in connection with the
recordation of the Thirteenth Supplemental Indenture, no such tax having been payable in connection with such recordation; and

WHEREAS,
the Company-Kansas executed and delivered to the Trustees the following supplemental indentures:



|                                      |  |                   |  | 
|------------------------------------- |  | ----------------- |  | 
|Designation                           |  | Dated as of       |  | 
|Fourteenth Supplemental Indenture     |  | July 1, 1975     
|Fifteenth Supplemental Indenture      |  | December 1, 1975 
|Sixteenth Supplemental Indenture      |  | September 1, 1976
|Seventeenth Supplemental Indenture    |  | March 1, 1977    
|Eighteenth Supplemental Indenture     |  | May 1, 1977      
|Nineteenth Supplemental Indenture     |  | August 1, 1977   
|Twentieth Supplemental Indenture      |  | March 15, 1978   
|Twenty-first Supplemental Indenture   |  | January 1, 1979  
|Twenty-second Supplemental Indenture  |  | April 1, 1980    
|Twenty-third Supplemental Indenture   |  | July 1, 1980     
|Twenty-fourth Supplemental Indenture  |  | August 1, 1980   
|Twenty-fifth Supplemental Indenture   |  | June 1, 1981     
|Twenty-sixth Supplemental Indenture   |  | December 1, 1981 
|Twenty-seventh Supplemental Indenture |  | May 1, 1982      
|Twenty-eighth Supplemental Indenture  |  | March 15, 1984   
|Twenty-ninth Supplemental Indenture   |  | September 1, 1984
|Thirtieth Supplemental Indenture      |  | September 1, 1984
|Thirty-first Supplemental Indenture   |  | February 1, 1985 
|Thirty-second Supplemental Indenture  |  | April 15, 1986   
|Thirty-third Supplemental Indenture   |  | June 1, 1991     
|Thirty-fourth Supplemental Indenture  |  | March 31, 1992   
|Thirty-fifth Supplemental Indenture   |  | December 17, 1992
|Thirty-sixth Supplemental Indenture   |  | August 12, 1993  
|Thirty-seventh Supplemental Indenture |  | January 15, 1994 
|Thirty-eighth Supplemental Indenture  |  | March 1, 1994    
|Thirty-ninth Supplemental Indenture   |  | April 15, 1994   
|Fortieth Supplemental Indenture       |  | June 28, 2000    
|Forty-first Supplemental Indenture    |  | June 6, 2002     
|Forty-second Supplemental Indenture   |  | March 12, 2004   
|Forty-third Supplemental Indenture    |  | June 1, 2004     
|Forty-fourth Supplemental Indenture   |  | May 6, 2005      
|Forty-fifth Supplemental Indenture    |  | March 17, 2006   



-5-



---

which supplemental indentures are hereinafter sometimes called the Fourteenth through Forty-fifth Supplemental
Indentures, respectively; and

WHEREAS, the Company-Kansas caused the Fourteenth Supplemental Indenture to be filed for record as a
mortgage of real property in the offices of the Registers of Deeds in various counties in the State of Kansas and as a chattel mortgage in the Office of the Secretary of State of Kansas; and

WHEREAS, the Company-Kansas caused the Fifteenth Supplemental Indenture to be filed for record as a mortgage of real property in the office of the
Register of Deeds of Sedgwick County, Kansas (filed on December 10, 1975, Film 169, page 363), and as a chattel mortgage in the Office of the Secretary of State of Kansas (filed on December 10, 1975 and indexed as No. 325,911); and

WHEREAS, the Company-Kansas caused the Sixteenth Supplemental Indenture to be filed for record as a mortgage of real property in the office of the
Register of Deeds of Sedgwick County, Kansas (filed on September 29, 1976, Film 21 1, page 363), and as a chattel mortgage in the Office of the Secretary of State of Kansas (filed on September 29, 1976 and indexed as No. 363,835); and

WHEREAS, the Company-Kansas caused the Seventeenth Supplemental Indenture to be filed for record as a mortgage of real property in the office of the
Register of Deeds of Sedgwick County, Kansas (filed on March 16, 1977, Film 234, page 492), and as a chattel mortgage in the Office of the Secretary of State of Kansas (filed on March 1, 1977 and indexed as No. 384,759); and

WHEREAS, the Company-Kansas caused the Eighteenth Supplemental Indenture to be filed for record as a mortgage of real property in the office of the
Register of Deeds of Sedgwick County, Kansas (filed on May 26, 1977, Film 246, page 655), and as a chattel mortgage in the Office of the Secretary of State of Kansas (filed on May 26, 1977 and indexed as No. 394,573); and

WHEREAS, the Company-Kansas caused the Nineteenth Supplemental Indenture to be filed for record as a mortgage of real property in the office of the
Register of Deeds of Sedgwick County, Kansas (filed on August 31, 1977, Film 263, page 882), and as a chattel mortgage in the Office of the Secretary of State of Kansas (filed on September 1, 1977 and indexed as No. 406,577); and

WHEREAS, the Company-Kansas caused the Twentieth Supplemental Indenture to be filed for record as a mortgage of real property in the office of the
Register of Deeds of Sedgwick County, Kansas (filed on March 29, 1978, Film 297, pages 635-656), and as a chattel mortgage in the Office of the Secretary of State of Kansas (filed on March 30, 1978 and indexed as No. 434,072); and

WHEREAS, the Company-Kansas caused the Twenty-first Supplemental Indenture to be filed for record as a mortgage of real property in the office of the
Register of Deeds of Sedgwick County, Kansas (filed on January 9, 1979, Film 345, page 648), and as a chattel mortgage in the Office of the Secretary of State of Kansas (filed on January 10, 1979 and indexed as No. 470,851); and

WHEREAS, the Company-Kansas caused the Twenty-second Supplemental Indenture to be filed for record as a mortgage of real property in the office of the
Register of Deeds of Sedgwick County, Kansas (filed on April 2, 1980, Film 413, page 1,468), and as a chattel mortgage in the Office of the Secretary of State of Kansas (filed on April 3, 1980 and indexed as No. 533,415); and



-6-



---

WHEREAS, the Company-Kansas caused the Twenty-third Supplemental Indenture to be filed for record as a
mortgage of real property in the office of the Register of Deeds of Sedgwick County, Kansas (filed on July 1, 1980, Film 425, page 1,003), and as a chattel mortgage in the Office of the Secretary of State of Kansas (filed on July 2, 1980 and indexed
as No. 546,185); and

WHEREAS, the Company-Kansas caused the Twenty-fourth Supplemental Indenture to be filed for record as a mortgage of
real property in the office of the Register of Deeds of Sedgwick County, Kansas (filed on August 28, 1980, Film 435, page 266), and as a chattel mortgage in the Office of the Secretary of State of Kansas (filed on August 29, 1980 and indexed as No.
554,543); and

WHEREAS, the Company-Kansas caused the Twenty-fifth Supplemental Indenture to be filed for record as a mortgage of real
property in the office of the Register of Deeds of Sedgwick County, Kansas (filed on June 30, 1981, Film 483, page 1,512), and as a chattel mortgage in the Office of the Secretary of State of Kansas (filed on June 30, 1981 and indexed as No.
601,270); and

WHEREAS, the Company-Kansas caused the Twenty-sixth Supplemental Indenture to be filed for record as a mortgage of real
property in the office of the Register of Deeds of Sedgwick County, Kansas (filed on December 30, 1981, Film 510, page 300), and as a chattel mortgage in the Office of the Secretary of State of Kansas (filed on December 31, 1981 and indexed as No.
628,293); and

WHEREAS, the Company-Kansas caused the Twenty-seventh Supplemental Indenture to be filed for record as a mortgage of real
property in the office of the Register of Deeds of Sedgwick County, Kansas (filed on May 6, 1982, Film 526, page 1,141), and as a chattel mortgage in the Office of the Secretary of State of Kansas (filed on May 7, 1982 and indexed as No. 650,115);
and

WHEREAS, the Company-Kansas caused the Twenty-eighth Supplemental Indenture to be filed for record as a mortgage of real property in
the office of the Register of Deeds of Sedgwick County, Kansas (filed on March 22, 1984, Film 645, page 1,524), and as a chattel mortgage in the Office of the Secretary of State of Kansas (filed on March 23, 1984 and indexed as No. 796,449); and

WHEREAS, the Company-Kansas caused the Twenty-ninth Supplemental Indenture to be filed for record as a mortgage of real property in the
office of the Register of Deeds of Sedgwick County, Kansas (filed on September 5, 1984, Film 681, page 763), and as a chattel mortgage in the Office of the Secretary of State of Kansas (filed on September 6, 1984 and indexed as No. 852,425); and

WHEREAS, the Company-Kansas caused the Thirtieth Supplemental Indenture to be filed for record as a mortgage of real property in the
office of the Register of Deeds of Sedgwick County, Kansas (filed on September 12, 1984, Film 682, page 1,087), and as a chattel mortgage in the Office of the Secretary of State of Kansas (filed on September 13, 1984 and indexed as No. 854,284); and

WHEREAS, the Company-Kansas caused the Thirty-third Supplemental Indenture to be filed for record as a mortgage of real property in the
office of the Register of Deeds of Sedgwick County, Kansas (filed on June 18, 1991, Film 1 177, page 0876), and as a security agreement in the Office of Secretary of State of Kansas (filed on June 18, 1991 and indexed as No. 1,693,446); and



-7-



---

WHEREAS, the Company-Kansas caused the Fortieth Supplemental Indenture to be filed for record as a
mortgage of real property in the office of the Register of Deeds of Sedgwick County, Kansas (filed on June 28, 2000, Film 2062, page 0053), and as a security agreement in the Office of Secretary of State of Kansas (filed on June 28, 2000, and
indexed as No. 3756913); and

WHEREAS, the Company on the following dates paid to the Register of Deeds of Sedgwick County, Kansas, that
being the County in which the Fourteenth through Thirtieth Supplemental Indentures, the Thirty-third Supplemental Indenture and the Fortieth Supplemental Indenture were first filed for record as a mortgage of real property, the following amounts:



|                   |  |        |             
|------------------ |  | ------ | ------------
|Date               |  | Amount
|July 2, 1975       |  | $      | 100,000     
|December 10, 1975  |  |        | 48,750      
|September 29, 1976 |  |        | 62,500      
|March 16, 1977     |  |        | 62,500      
|May 26, 1977       |  |        | 25,000      
|August 31, 1977    |  |        | 6,100       
|March 29, 1978     |  |        | 62,500      
|January 9, 1979    |  |        | 36,250      
|April 2, 1980      |  |        | 67,500      
|July 1, 1980       |  |        | 37,500      
|August 28, 1980    |  |        | 63,750      
|June 30, 1981      |  |        | 75,000      
|December 30, 1981  |  |        | 62,500      
|May 6, 1982        |  |        | 100,000     
|March 22, 1984     |  |        | 93,750      
|September 5, 1984  |  |        | 75,000      
|September 12, 1984 |  |        | 50,000      
|June 18, 1991      |  |        | 334,100     
|June 28, 2000      |  |        | 1,780,538.50

such amounts being in payment of the Kansas mortgage registration tax as provided by the then currently applicable
sections of the statutes of the State of Kansas in effect on those dates; and

WHEREAS, the Company-Kansas caused the Thirty-first
Supplemental Indenture to be filed for record as a mortgage of real property in the office of the Register of Deeds of Sedgwick County, Kansas (filed on February 1, 1985, Film 707, page 378), and as a chattel mortgage in the Office of the Secretary
of State of Kansas (filed on February 4, 1985 and indexed as No. 895,468), but paid no mortgage registration tax in connection with the recordation of the Thirty-first Supplemental Indenture, no such tax having been payable in connection with such
recordation; and



-8-



---

WHEREAS, the Company-Kansas caused the Thirty-second Supplemental Indenture to be filed for record as a
mortgage of real property in the office of the Register of Deeds of Sedgwick County, Kansas (filed on April 16, 1986, Film 791, page 1,336), and as a chattel mortgage in the Office of the Secretary of State of Kansas (filed on April 17, 1986 and
indexed as No. 1,048,212), but paid no mortgage registration tax in connection with the recordation of the Thirty-second Supplemental Indenture, no such tax having been payable in connection with such recordation; and

WHEREAS, in order to evidence the succession of the Company to the Company-Kansas and the assumption by the Company of the covenants and conditions of
the Company-Kansas in the bonds and in the Mortgage contained, and to enable the Company to have and exercise the powers and rights of the Company-Kansas under the Mortgage in accordance with the terms thereof, the Company executed and delivered to
the Trustees a Thirty-fourth Supplemental Indenture, dated as of March 31, 1992 (which supplemental indenture is hereinafter sometimes called the Thirty-fourth Supplemental Indenture); and

WHEREAS, the Company-Kansas caused the Thirty-fourth Supplemental Indenture to be filed for record as a mortgage of real property in the office of the
Register of Deeds of Sedgwick County, Kansas (filed on March 31, 1992, Film 1236, page 987), and as a security agreement in the Office of Secretary of State of Kansas (filed on March 31, 1992 and indexed as No. 1,780,893), but paid no mortgage
registration tax in connection with the recordation of the Thirty-fourth Supplemental Indenture, no such tax having been payable in connection with such recordation; and

WHEREAS, the Company caused the Thirty-fifth Supplemental Indenture to be filed for record as a mortgage of real property in the office of the Register of Deeds of Sedgwick County, Kansas (filed on December 16, 1992,
Film 301, page 0104), and as a security agreement in the Office of Secretary of State of Kansas (filed on December 16, 1992 and indexed as No. 1,861,886), but paid no mortgage registration tax in connection with the recordation of the Thirty-fifth
Supplemental Indenture, no such tax having been payable in connection with such recordation; and

WHEREAS, the Company-Kansas caused the
Thirty-sixth Supplemental Indenture to be filed for record as a mortgage of real property in the office of the Register of Deeds of Sedgwick County, Kansas (filed on August 10, 1993, Film 1364, page 0515), and as a security agreement in the Office
of Secretary of State of Kansas (filed on August 11, 1993 and indexed as No. 1,936,501), but paid no mortgage registration tax in connection with the recordation of the Thirty-sixth Supplemental Indenture, no such tax having been payable in
connection with such recordation; and

WHEREAS, the Company-Kansas caused the Thirty-seventh Supplemental Indenture to be filed for record
as a mortgage of real property in the office of the Register of Deeds of Sedgwick County, Kansas (filed on January 18, 1994, Film 1411, page 0710), and as a security agreement in the Office of Secretary of State of Kansas (filed on January 18, 1994
and indexed as No. 1,985,104), but paid no mortgage registration tax in connection with the recordation of the Thirty-seventh Supplemental Indenture, no such tax having been payable in connection with such recordation; and

WHEREAS, the Company-Kansas caused the Thirty-eighth Supplemental Indenture to be filed for record as a mortgage of real property in the office of the
Register of Deeds of Sedgwick



-9-



---

County, Kansas (filed on February 28, 1994, Film 1422, page 1046), and as a security agreement in the Office of
Secretary of State of Kansas (filed on February 28, 1994 and indexed as No. 1,997,743), but paid no mortgage registration tax in connection with the recordation of the Thirty-eighth Supplemental Indenture, no such tax having been payable
in connection with such recordation; and

WHEREAS, the Company-Kansas caused the Thirty-ninth Supplemental Indenture to be filed for record
as a mortgage of real property in the office of the Register of Deeds of Sedgwick County, Kansas (filed on April 27, 1994, Film 1440, page 855), and as a security agreement in the Office of Secretary of State of Kansas (filed on April 27,
1994 and indexed as No. 1,377,915), but paid no mortgage registration tax in connection with the recordation of the Thirty-ninth Supplemental Indenture, no such tax having been payable in connection with such recordation; and

WHEREAS, the Company-Kansas caused the Forty-first Supplemental Indenture to be filed for record as a mortgage of real property in the office of the
Register of Deeds of Sedgwick County, Kansas (filed on June 6, 2002, Film 2460, page 1), and as a security agreement in the office of Secretary of State of Kansas (filed on June 6, 2002, and indexed as No. 5264221), but paid no
mortgage registration tax in connection with the recordation of the Forty-first Supplemental Indenture, no such tax having been payable in connection with such recordation; and

WHEREAS, the Company-Kansas caused the Forty-second Supplemental Indenture to be filed for record as a mortgage of real property in the office of the
Register of Deeds of Sedgwick County, Kansas (filed on March 12, 2004, Film 2854, page 8731), and as a security agreement in the office of Secretary of State of Kansas (filed on March 12, 2004, and indexed as No. 5760673), but paid no
mortgage registration tax in connection with the recordation of the Forty-second Supplemental Indenture, no such tax having been payable in connection with such recordation; and

WHEREAS, the Company-Kansas caused the Forty-third Supplemental Indenture to be filed for record as a mortgage of real property in the office of the
Register of Deeds of Sedgwick County, Kansas (filed on June 10, 2004, Film and Page 28578510), and as a security agreement in the office of Secretary of State of Kansas (filed on June 10, 2004, and indexed as No. 5820311), but paid no
mortgage registration tax in connection with the recordation of the Forty-third Supplemental Indenture, no such tax having been payable in connection with such recordation; and

WHEREAS, the Company-Kansas caused the Forty-fourth Supplemental Indenture to be filed for record as a mortgage of real property in the office of the
Register of Deeds of Sedgwick County, Kansas (filed on May 6, 2005, Film and Page 28671438), and as a security agreement in the office of Secretary of State of Kansas (filed on May 6, 2005, and indexed as No. 5981824), but paid no
mortgage registration tax in connection with the recordation of the Forty-fourth Supplemental Indenture, no such tax having been payable in connection with such recordation; and

WHEREAS, the Company-Kansas caused the Forty-fifth Supplemental Indenture to be filed for record as a mortgage of real property in the office of the
Register of Deeds of Sedgwick County, Kansas (filed on March 17, 2006, Film and Page 28764552), and as a security agreement in the office of Secretary of State of Kansas (filed on March 17, 2006, and indexed as No. 6122576), but paid
no mortgage registration tax in connection with the recordation of the Forty-fifth Supplemental Indenture, no such tax having been payable in connection with such recordation; and



-10-



---

WHEREAS, the Company-West Virginia, the Company-Kansas or the Company has from time to time caused to be
filed in the respective offices of the above-mentioned Registers of Deeds and Secretary of State affidavits executed by the Trustees under the Mortgage, preserving and continuing the lien thereof either as a chattel mortgage in accordance with the
provisions of K.S.A. 58-303 (Section 58-303 of the General Statutes of Kansas 1935) or as a security agreement under the provisions of K.S.A. 84-9-401 et seq.;and

WHEREAS, in addition to the aforesaid filings for record in the respective offices of the above-mentioned Registers of Deeds, the Company-West Virginia, the Company-Kansas or the Company has filed copies of the
Mortgage and the First through Forty-fifth Supplemental Indentures, certified as true by it, with the Secretary of State of Kansas; and

WHEREAS, the Company-West Virginia, the Company-Kansas or the Company has heretofore issued, in accordance with the provisions of the Mortgage, as heretofore supplemented, the following series of First Mortgage Bonds:



|                       |  |                         |            |                              |     
|---------------------- |  | ----------------------- | ---------- | ---------------------------- | ----
|Series                 |  | Principal Amount Issued |            | Principal Amount Outstanding
|33/8%
Series due 1970  |  | $                       | 16,000,000 |                              | None
|31/8%
Series due 1978  |  |                         | 5,000,000  |                              | None
|23/4%
Series due 1979  |  |                         | 3,000,000  |                              | None
|33/8%
Series due 1982  |  |                         | 12,000,000 |                              | None
|35/8%
Series due 1983  |  |                         | 10,000,000 |                              | None
|33/8%
Series due 1985  |  |                         | 10,000,000 |                              | None
|33/8%
Series due 1986  |  |                         | 7,000,000  |                              | None
|45/8%
Series due 1991  |  |                         | 7,000,000  |                              | None
|55/8%
Series due 1996  |  |                         | 16,000,000 |                              | None
|81/2%
Series due 2000  |  |                         | 35,000,000 |                              | None
|81/8%
Series due 2001  |  |                         | 35,000,000 |                              | None
|73/8%
Series due 2002  |  |                         | 25,000,000 |                              | None
|95/8%
Series due 2005  |  |                         | 40,000,000 |                              | None
|6% Series due 1985     |  |                         | 7,000,000  |                              | None
|73/4%
Series due 2005  |  |                         | 12,500,000 |                              | None
|83/8%
Series due 2006  |  |                         | 25,000,000 |                              | None
|81/2%
Series due 2007  |  |                         | 25,000,000 |                              | None
|6% Series due 2007     |  |                         | 10,000,000 |                              | None
|57/8%
Series due 2007  |  |                         | 21,940,000 |                              | None
|87/8%
Series due 2008  |  |                         | 30,000,000 |                              | None
|6.80% Series due 2004  |  |                         | 14,500,000 |                              | None
|161/4% Series due 1987 |  |                         | 30,000,000 |                              | None



-11-



---

|                                |  |                         |  |                              |  
|------------------------------- |  | ----------------------- |  | ---------------------------- | -
|Series                          |  | Principal Amount Issued |  | Principal Amount Outstanding |  
|61/2%
Series due 1983           |  | 15,000,000              |  | None                         |  
|71/4%
Series due 1983           |  | 25,500,000              |  | None                         |  
|147/8% Series due 1987-1991     |  | 30,000,000              |  | None                         |  
|16% Series due 1996             |  | 25,000,000              |  | None                         |  
|153/4% Series due 1989          |  | 40,000,000              |  | None                         |  
|131/2% Series due 1989          |  | 100,000,000             |  | None                         |  
|14.05% Series due 1991          |  | 30,000,000              |  | None                         |  
|141/8% Series due 1991          |  | 20,000,000              |  | None                         |  
|107/8% Series due 1987          |  | 30,000,000              |  | None                         |  
|93/4%
Series due 2016           |  | 50,000,000              |  | None                         |  
|7.00% Series A due 2031         |  | 18,900,000              |  | None                         |  
|7.00% Series B due 2031         |  | 308,600,000             |  | None                         |  
|7.60% Series due 2003           |  | 135,000,000             |  | None                         |  
|61/2%
Series due 2005           |  | 65,000,000              |  | None                         |  
|6.20% Series due 2006           |  | 100,000,000             |  | None                         |  
|5.10% Series due 2023           |  | 13,982,500              |  | 13,487,500                   |  
|71/2%
Series A due 2032         |  | 14,500,000              |  | 14,500,000                   |  
|71/2%
Series B due 2027         |  | 21,940,000              |  | 21,940,000                   |  
|71/2%
Series C due 2032         |  | 10,000,000              |  | 10,000,000                   |  
|91/2%
Series due 2003           |  | 702,200,000             |  | None                         |  
|8% Series due 2005              |  | 735,000,000             |  | None                         |  
|31/2%
Series due in 2007        |  | 300,000,000             |  | None                         |  
|5.30% Series due 2031           |  | 18,900,000              |  | 18,900,000                   |  
|5.30% Series A due 2031         |  | 108,600,000             |  | 108,600,000                  |  
|2.65% Series B due 2031         |  | 100,000,000             |  | 100,000,000                  | *
|Variable Rate Series C due 2031 |  | 100,000,000             |  | 100,000,000                  |  
|4.60% Series due 2010           |  | 350,000,000             |  | None                         |  
|5.57% Series due 2011           |  | 500,000,000             |  | 500,000,000                  |  

---

|* | Upon issuance of the bonds of the Fifty-first and Fifty-second Series pursuant to this Supplemental Indenture, the 2.65% Series B First Mortgage Bonds Series due 2031 will be
retired and will no longer be outstanding under the Indenture.
|- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

hereinafter sometimes called Bonds of the First through
Fiftieth Series; and

WHEREAS, Section 8 of the Mortgage provides that the form of each series of bonds (other than the First Series)
issued thereunder and of the coupons to be attached to the coupon bonds of such series shall be established by Resolution of the Board of Directors of the Company and that the form of such series, as established by said Board of Directors, shall
specify the descriptive title of the bonds and various other terms thereof, and may also contain such provisions not inconsistent with the provisions of the Mortgage as the Board of Directors may, in its discretion, cause to be inserted therein
expressing or referring to the terms and conditions upon which such bonds are to be issued and/or secured under the Mortgage; and



-12-



---

WHEREAS, Section 120 of the Mortgage provides, among other things, that any power, privilege or right
expressly or impliedly reserved to or in any way conferred upon the Company by any provision of the Mortgage whether such power, privilege or right is in any way restricted or is unrestricted, may be in whole or in part waived or surrendered or
subjected to any restriction if at the time unrestricted or to additional restriction if already restricted, and the Company may enter into any further covenants, limitations or restrictions for the benefit of any one or more series of bonds issued
thereunder, or the Company may cure any ambiguity contained therein or in any supplemental indenture, or may establish the terms and provisions of any series of bonds other than said First Series, by an instrument in writing executed and
acknowledged by the Company in such manner as would be necessary to entitle a conveyance of real estate to record in all of the states in which any property at the time subject to the lien of the Mortgage shall be situated; and

WHEREAS, the Company now desires to create two new series of bonds; and

WHEREAS, the execution and delivery by the Company of this Forty-sixth Supplemental Indenture, and the terms of the Bonds of the Fifty-first Series and Fifty-second Series, hereinafter referred to, have been duly
authorized by the Board of Directors of the Company by appropriate Resolutions of said Board of Directors;

NOW, THEREFORE, THIS INDENTURE
WITNESSETH:

That Kansas Gas and Electric Company, in consideration of the premises and of One Dollar ($1) to it duly paid by the Trustees
at or before the ensealing and delivery of these presents, the receipt whereof is hereby acknowledged, and in further evidence of assurance of the estate, title and rights of the Trustees and in order further to secure the payment both of the
principal of and interest and premium, if any, on the bonds from time to time issued under the Mortgage, according to their tenor and effect and the performance of all the provisions of the Mortgage (including any instruments supplemental thereto
and any modification made as in the Mortgage provided) and of said bonds, hereby grants, bargains, sells, releases, conveys, assigns, transfers, mortgages, pledges, sets over and confirms (subject, however, to Excepted Encumbrances as defined in
Section 6 of the Mortgage) unto BNY Midwest Trust Company and to Judith L. Bartolini, as Trustees under the Mortgage, and to their successor or successors in said trust, and to said Trustees and their successors and assigns forever, all
property, real, personal and mixed, acquired by the Company after the date of the execution and delivery of the Mortgage, in addition to property covered by the First through the Forty-fifth Supplemental Indentures (except any herein or in the
Mortgage, as heretofore supplemented, expressly excepted), now owned or, subject to the provisions of Section 87 of the Mortgage, hereafter acquired by the Company and wheresoever situated, including (without in anywise limiting or impairing by
the enumeration of the same the scope and intent of the foregoing or of any general description contained in this Forty-sixth Supplemental Indenture) all lands, flowage rights, water rights, flumes, raceways, dams, rights of way and roads; all steam
and power houses, gas plants, street lighting systems, standards and other equipment incidental thereto, telephone, radio and television systems, air-conditioning systems and equipment incidental thereto, water works, steam heat and hot water
plants, lines, service



-13-



---

and supply systems, bridges, culverts, tracks, rolling stock, ice or refrigeration plants and equipment, street and
interurban railway systems, offices, buildings and other structures and the equipment thereof; all machinery, engines, boilers, dynamos, electric and gas machines, regulators, meters, transformers, generators, motors, electrical, gas and mechanical
appliances, conduits, cables, water, steam heat, gas or other pipes, gas mains and pipes, service pipes, fittings, valves and connections, pole and transmission lines, wires, cables, tools, implements, apparatus, furniture, chattels and chooses in
action; all municipal and other franchises; all lines for the transmission and distribution of electric current, gas, steam heat or water for any purpose, including poles, wires, cables, pipes, conduits, ducts and all apparatus for use in connection
therewith; all real estate, lands, easements, servitudes, licenses, permits, franchises, privileges, rights of way and other rights in or relating to real estate or the occupancy of the same and (except as herein or in the Mortgage, as heretofore
supplemented, expressly excepted), all the right, title and interest of the Company in and to all other property of any kind or nature appertaining to and/or used and/or occupied and/or enjoyed in connection with any property hereinbefore or in the
Mortgage, as heretofore supplemented, described.

TOGETHER WITH all and singular the tenements, hereditarnents and appurtenances belonging
or in anywise appertaining to the aforesaid property or any part thereof, with the reversion and reversions, remainder and remainders and (subject to the provisions of Section 57 of the Mortgage) the tolls, rents, revenues, issues, earnings, income,
product and profits thereof, and all the estate, right, title and interest and claim whatsoever, at law as well as in equity, which the Company now has or may hereafter acquire in and to the aforesaid property and franchises and every part and
parcel thereof.

IT IS HEREBY AGREED by the Company that, subject to the provisions of Section 87 of the Mortgage, all the property, rights
and franchises acquired by the Company after the date hereof (except any herein or in the Mortgage, as heretofore supplemented, expressly excepted), shall be as fully embraced within the lien hereof and the lien of the Mortgage, as if such property,
rights and franchises were now owned by the Company and were specifically described herein and conveyed hereby.

PROVIDED that the
following are not and are not intended to be now or hereafter granted, bargained, sold, released, conveyed, assigned, transferred, mortgaged, pledged, set over or confirmed hereunder and are hereby expressly excepted from the lien and operation of
this Forty-sixth Supplemental Indenture and from the lien and operation of the Mortgage, viz.: (1) cash, shares of stock and obligations (including bonds, notes and other securities) not hereafter specifically pledged, paid, deposited or delivered
under the Mortgage or covenanted so to be; (2) merchandise, equipment, materials or supplies held for the purpose of sale in the usual course of business and fuel, oil and similar materials and supplies consumable in the operation of any properties
of the Company; vehicles and automobiles; (3) bills, notes and accounts receivable, and all contracts, leases and operating agreements not specifically pledged under the Mortgage or covenanted so to be; and (4) electric energy, and other materials
or products generated, manufactured, produced or purchased by the Company for sale, distribution or use in the ordinary course of its business; provided, however, that the property and rights expressly excepted from the lien and operation of the
Mortgage and this Forty-sixth Supplemental Indenture in the above subdivisions (2) and (3) shall (to the extent permitted by law) cease to be so excepted in the event that either or both of the Trustees or a receiver or trustee shall enter upon and
take possession of the Mortgaged and Pledged Property in the manner provided in Article XII of the Mortgage by reason of the occurrence of a Default as defined in said Article XII.



-14-



---

THERE is expressly excepted from the lien of the Mortgage and from the lien hereof all property of the
Company located in the State of Missouri now owned or hereafter acquired unless such property in the State of Missouri shall be subjected to the lien of the Mortgage by an indenture or indentures supplemental thereto, pursuant to authorization by
the Board of Directors of the Company.

TO HAVE AND TO HOLD all such properties, real, personal and mixed, granted, bargained, sold,
released, conveyed, assigned, transferred, mortgaged, pledged, set over or confirmed by the Company as aforesaid, or intended so to be, unto the Trustees, their successors and assigns forever.

IN TRUST NEVERTHELESS, for the same purposes and upon the same terms, trusts and conditions and subject to and with the same provisos and covenants as
are set forth in the Mortgage, as supplemented, this Forty-sixth Supplemental Indenture being supplemental thereto.

AND IT IS HEREBY
COVENANTED by the Company that all the terms, conditions, provisos, covenants and provisions contained in the Mortgage, as supplemented, shall affect and apply to the property hereinbefore described and conveyed and to the estate, rights,
obligations and duties of the Company and Trustees and the beneficiaries of the trust with respect to said property, and to the Trustees and their successors as Trustees of said property in the same manner and with the same effect as if the said
property had been owned by the Company at the time of the execution of the Mortgage, and had been specifically and at length described in and conveyed to the Trustees by the Mortgage as a part of the property therein stated to be conveyed.

The Company further covenants and agrees to and with the Trustees and their successors in said trust under the Mortgage, as follows:

ARTICLE I

FIFTY-FIRST SERIES
OF BONDS

SECTION 1. (I) There shall be a series of bonds designated Burlington Series 2004B-1 due 2031 (herein sometimes
referred to as the Fifty-first Series), each of which shall also bear the descriptive title, First Mortgage Bond, and the form thereof, which is established by Resolution of the Board of Directors of the Company, shall contain suitable
provisions with respect to the matters hereinafter in this Article I specified. Bonds of the Fifty-first Series shall be limited to $50,000,000 in aggregate principal amount, except as provided in Section 16 of the Mortgage, shall mature on
June 1, 2031, and shall be issued as fully registered bonds in denominations of Five Thousand Dollars and in any multiple or multiples of Five Thousand Dollars. Bonds of the Fifty-first Series shall bear interest from time to time at a rate
equal to the interest rate then borne by the City of Burlington, Kansas, Pollution Control Refunding Revenue Bonds (Kansas Gas and Electric Company Project), Series 2004B-1 (hereinafter referred to as the Burlington Bonds
Series 2004B-1), issued



-15-



---

under the Indenture of Trust, dated as of June 1, 2004 (hereinafter referred to as the Burlington
Indenture), of the City of Burlington, Kansas, which rate shall be 4.85% per annum, payable at the same times as interest is payable on the Burlington Bonds Series 2004B-1, the first payment to be made on December 1, 2006 for the
period from June 1, 2006 to, but not including, December 1, 2006. The principal of and interest on bonds of the Fifty-first Series shall be payable at the office or agency of the Company in the Borough of Manhattan, The City of New York,
in such coin or currency of the United States of America as at the time of payment is legal tender for public and private debts. Bonds of the Fifty-first Series shall be dated as in Section 10 of the Mortgage provided.

(II) Upon the redemption, in whole or in part, of the Burlington Bonds Series 2004B-1, bonds of the Fifty-first Series shall be redeemed in whole or in
like part. To effect the redemption of bonds of the Fifty-first Series, the trustee under the Burlington Indenture (hereinafter referred to as the Burlington Trustee) shall deliver to the Corporate Trustee (and mail a copy thereof to the
Company) a written demand (hereinafter referred to as a Burlington Redemption Demand) for the redemption of bonds of the Fifty-first Series equal in principal amount to the principal amount of the Burlington Bonds Series 2004B-1 to be
redeemed. The Burlington Redemption Demand shall be signed by the President, a Vice President, an Assistant Vice President or a Trust Officer of the Burlington Trustee and shall state: (1) the aggregate principal amount of the Burlington Bonds
Series 2004B-1 then outstanding under the Burlington Indenture; (2) the principal amount of the Burlington Bonds Series 2004B-1 to be redeemed; (3) the interest thereon and premium, if any, to be payable on the redemption date;
(4) the redemption date and that notice thereof has been given as required in the Burlington Indenture; (5) that the Corporate Trustee is thereby instructed to call for redemption bonds of the Fifty-first Series equal in principal amount
to the principal amount of the Burlington Bonds Series 2004B-1 specified in (2) above and on the same date and at the same price as the Burlington Bonds Series 2004B-1. The Burlington Redemption Demand shall also contain a waiver of notice of
such redemption by the Burlington Trustee, as holder of all bonds of the Fifty-first Series then outstanding. The Corporate Trustee may conclusively presume the statements contained it the Burlington Redemption Demand to be correct. Redemption of
the bonds of the Fifty-first Series shall be at the principal amount of the bonds to be redeemed, together with premium, if any, and the accrued interest to the redemption date, and such amount shall become and be due and payable on the redemption
date.

If the Burlington Trustee has declared the principal of and accrued interest on the Burlington Bonds Series 2004B-1 to be
immediately due and payable pursuant to Section 7.2 of the Burlington Indenture as a result of an Event of Default under Section 7.1 of the Burlington Indenture (except 7.1(f) thereof), and if the Burlington Trustee shall deliver to the
Corporate Trustee (and mail a copy thereof to the Company) a written demand (hereinafter referred to as a Burlington Bonds Acceleration Notice) for the immediate redemption of bonds of the Fifty-first Series in whole, the bonds of the
Fifty-first Series shall be immediately redeemed at the principal amount thereof and accrued interest thereon. The Burlington Bonds Acceleration Notice shall be signed by the President, a Vice President, an Assistant Vice President or a Trust
Officer of the Burlington Trustee and shall state: (1) the aggregate principal amount of the Burlington Bonds Series 2004B-1 then outstanding under the Burlington Indenture; (2) that the entire principal amount of the Burlington Bonds
Series 2004B-1 has been declared by the Burlington Trustee to be immediately due and payable pursuant to Section 7.2 of the Burlington Indenture; (3) that the Corporate Trustee is thereby instructed to call for immediate redemption bonds
of the Fifty-first Series in whole; and (4) that the Burlington Trustee, as holder of all bonds of the Fifty-first Series, waives notice of such redemption.



-16-



---

The Company hereby covenants that if a Burlington Redemption Demand or a Burlington Bonds Acceleration
Notice shall be delivered to the Corporate Trustee, the Company subject to subdivision (III) of this Article I, will deposit, on or before the redemption date, with the Corporate Trustee, in accordance with Article X of the Mortgage, an amount in
cash sufficient to redeem the bonds of the Fifty-first Series so called for redemption.

The bonds of the Fifty-first Series shall not be
subject to redemption prior to maturity except as provided in this Section (I) II.

(III) All bonds of the Fifty-first Series shall be
issued and pledged by the Company with the Burlington Trustee to secure the payment of the principal of, interest on the Burlington Bonds Series 2004B-1. The obligation of the Company to make payments with respect to the principal of and interest on
bonds of the Fifty-first Series shall be fully or partially, as the case may be, satisfied and discharged to the extent that, at the time that any such payment shall be due, the then due principal of and interest on the Burlington Bonds Series
2004B-1 shall have been fully or partially paid, or there shall be in the Bond Fund established pursuant to the Burlington Indenture sufficient available funds to fully or partially pay the then due principal of and interest on the Burlington Bonds
Series 2004B-1. The Corporate Trustee may conclusively presume that the obligation of the Company to make payments with respect to the principal of and interest on bonds of the Fifty-first Series shall have been fully satisfied and discharged unless
and until the Corporate Trustee shall have received a written notice from the Burlington Trustee, signed by its President, a Vice President, or a Trust Officer, stating (i) that timely payment of the principal of or interest on the Burlington
Bonds Series 2004B-1 required to be made by the Company has not been made, (ii) that there are not sufficient available funds held in the Bond Fund to make such payment and (iii) the amount of funds, in addition to available funds held in
the Bond Fund, required to make such payment.

(IV) At the option of the registered owner, any bonds of the Fifty-first Series, upon
surrender thereof, for cancellation, at the office or agency of the Company in the Borough of Manhattan, The City of New York, shall be exchangeable for a like aggregate principal amount of bonds of the same series of other authorized denominations.
The bonds of the Fifty-first Series may bear such legends as may be necessary to comply with any law or with any rules or regulations made pursuant thereto or with the rules or regulations of any stock exchange or to conform to usage with respect
thereto.

(V) Bonds of the Fifty-first Series shall be transferable upon the surrender thereof, for cancellation, together with a written
instrument of transfer in form approved by the registrar duly executed by the registered owner or by his duly authorized attorney, at the office or agency of the Company in the Borough of Manhattan, The City of New York.

(VI) The Company may deliver to the Burlington Trustee in substitution for any bonds of the Fifty-first Series, mortgage bonds or other similar
instruments of the Company or any successor entity, whether by merger, combination or acquisition of all or substantially all of the assets of the



-17-



---

Company, or otherwise, issued under the Mortgage in the event of a reallocation of the Burlington Bonds Series 2004B-1 in
connection with a change in Mode as provided in Section 2.1 of the Burlington Indenture or under a mortgage and deed of trust or similar instrument of the Company or any successor entity, in each case, in like principal amount of like term and
bearing the same rate of interest as the bonds of the Fifty-first Series (such substituted bonds hereinafter being referred to as the Substituted Mortgage Bonds). The Substituted Mortgage Bonds may only be delivered to the Burlington
Trustee upon receipt by the Burlington Trustee of (i) if not delivered under the Mortgage, a letter from Moodys (as hereinafter defined), dated within ten days prior to the date of delivery of the Substituted Mortgage Bonds, stating that
its rating of the Substituted Mortgage Bonds is at least equal to its then current rating on the bonds of the Fifty-first Series, (ii) if not delivered under the Mortgage, a letter from S&P (as hereinafter defined), dated within ten days
prior to the date of delivery of the Substituted Mortgage Bonds, stating that its rating of the Substituted Mortgage Bonds is at least equal to its then current rating on the bonds of the Fifty-first Series, (iii) an opinion of counsel which
may be in-house counsel or counsel to the Company or any successor entity, to the effect that the Substituted Mortgage Bonds shall have been duly and validly authorized, executed, authenticated, and delivered and shall constitute the valid, legally
binding and enforceable obligations of the Company or any successor entity enforceable in accordance with their terms, except as limited by bankruptcy, insolvency or other laws affecting the enforcement of mortgagees and other creditors
rights and shall be entitled to the benefit of the Mortgage or the mortgage and deed of trust or similar instrument pursuant to which they shall have been issued, (iv) an opinion of Bond Counsel, as defined in the Burlington Indenture, to the
effect that the substitution of the Substituted Mortgage Bonds will not adversely affect the exclusion from gross income for federal income tax purposes of interest on the Burlington Bonds Series 2004B-1 and (v) such other certificates and
documents with respect to the issuance and delivery of the Substituted Mortgage Bonds as may be required by law or as the Burlington Trustee may reasonably request.

Moodys means Moodys Investor Services, Inc., a corporation organized and existing under the laws of the State of Delaware, its successors and their assigns, except that if such corporation
shall be dissolved or liquidated or shall no longer perform the functions of a securities rating agency, then the term Moodys shall be deemed to refer to any other nationally recognized securities rating agency selected by the
Company.



-18-



---

S&P means Standard & Poors Ratings Services, a division of The McGraw Hill
Companies, Inc., duly organized and existing under and by virtue of the laws of the State of New York, and its successors and assigns, except that if such rating agency shall be dissolved or liquidated or shall no longer perform the functions of a
securities rating agency, then the term S&P shall be deemed to refer to any other nationally recognized securities rating agency selected by the Company.

ARTICLE II

FIFTY-SECOND SERIES OF BONDS

SECTION 1. (I) There shall be a series of bonds designated Burlington Series 2004B-2 due 2031 (herein sometimes referred to as the
Fifty-second Series), each of which shall also bear the descriptive title, First Mortgage Bond, and the form thereof, which is established by Resolution of the Board of Directors of the Company, shall contain suitable provisions with
respect to the matters hereinafter in this Article II specified. Bonds of the Fifty-second Series shall be limited to $50,000,000 in aggregate principal amount, except as provided in Section 16 of the Mortgage, shall mature on June 1,
2031, and shall be issued as fully registered bonds in denominations of Five Thousand Dollars and in any multiple or multiples of Five Thousand Dollars. Bonds of the Fifty-second Series shall bear interest from time to time at a rate equal to the
interest rate then borne by the City of Burlington, Kansas, Pollution Control Refunding Revenue Bonds (Kansas Gas and Electric Company Project) Series 2004B-2, (hereinafter referred to as the Burlington Bonds Series 2004B-2), issued
under the Burlington Indenture, payable at the same times as interest is payable on the Burlington Bonds Series 2004B-2. The principal of and interest on bonds of the Fifty-second Series shall be payable at the office or agency of the Company in the
Borough of Manhattan, The City of New York, in such coin or currency of the United States of America as at the time of payment is legal tender for public and private debts. Bonds of the Fifty-second Series shall be dated as in Section 10 of the
Mortgage provided.

(II) Upon the redemption, in whole or in part, of the Burlington Bonds Series 2004B-2, bonds of the Fifty-second Series
shall be redeemed in whole or in like part. To effect the redemption of bonds of the Fifty-second Series, the Burlington Trustee shall deliver to the Corporate Trustee (and mail a copy thereof to the Company) a written demand (hereinafter referred
to as a Burlington Redemption Demand) for the redemption of bonds of the Fifty-second Series equal in principal amount to the principal amount of the Burlington Bonds Series 2004B-2 to be redeemed. The Burlington Redemption Demand shall
be signed by the President, a Vice President, an Assistant Vice President or a Trust Officer of the Burlington Trustee and shall state: (1) the aggregate principal amount of the Burlington Bonds Series 2004B2 then outstanding under the
Burlington Indenture; (2) the principal amount of the Burlington Bonds Series 2004B-2 to be redeemed; (3) the interest thereon and premium, if any, to be payable on the redemption date; (4) the redemption date and that notice thereof
has been given as required in the Burlington Indenture; and (5) that the Corporate Trustee is thereby instructed to call for redemption bonds of the Fifty-second Series equal in principal amount to the principal amount of the Burlington Bonds
Series 2004B-2 specified in (2) above and on the same date and at the same price as the Burlington Bonds Series 2004B-2. The Burlington Redemption Demand



-19-



---

shall also contain a waiver of notice of such redemption by the Burlington Trustee, as holder of all bonds of the
Fifty-second Series then outstanding. The Corporate Trustee may conclusively presume the statements contained in the Burlington Redemption Demand to be correct. Redemption of the bonds of the Fifty-second Series shall be at the principal amount of
the bonds to be redeemed, together with premium, if any, and the accrued interest to the redemption date, and such amount shall become and be due and payable on the redemption date.

If the Burlington Trustee has declared the principal of and accrued interest on the Burlington Bonds Series 2004B-2 to be immediately due and payable
pursuant to Section 7.2 of the Burlington Indenture as a result of an Event of Default under Section 7.1 of the Burlington Indenture (except 7.1(f) thereof), and if the Burlington Trustee shall deliver to the Corporate Trustee (and mail a
copy thereof to the Company) a written demand (hereinafter referred to as a Burlington Bonds Acceleration Notice) for the immediate redemption of bonds of the Fifty-second Series in whole, the bonds of the Fifty-second Series shall be
immediately redeemed at the principal amount thereof and accrued interest thereon. The Burlington Bonds Acceleration Notice shall be signed by the President, a Vice President, an Assistant Vice President or a Trust Officer of Burlington Trustee and
shall state: (1) the aggregate principal amount of the Burlington Bonds Series 2004B-2 then outstanding under the Burlington Indenture; (2) that the entire principal amount of the Burlington Bonds Series 2004B-2 has been declared by the
Burlington Trustee to be immediately due and payable pursuant to Section 7.2 of the Burlington Indenture; (3) that the Corporate Trustee is thereby instructed to call for immediate redemption bonds of the Fifty-second Series in whole; and
(4) that the Burlington Trustee, as holder of all bonds of the Fifty-second Series, waives notice of such redemption.

The Company
hereby covenants that if a Burlington Redemption Demand or a Burlington Bonds Acceleration Notice shall be delivered to the Corporate Trustee, the Company, subject to subdivision (III) of this Article II, will deposit, on or before the redemption
date, with the Corporate Trustee, in accordance with Article X of the Mortgage, an amount in cash sufficient to redeem the bonds of the Fifty-second Series so called for redemption.

The bonds of the Fifty-second Series shall not be subject to redemption prior to maturity except as provided in this Section I (II).

(III) All bonds of the Fifty-second Series shall be issued and pledged by the Company with the Burlington Trustee to secure the payment of the principal
of, and interest on, the Burlington Bonds Series 2004B-2. The obligation of the Company to make payments with respect to the principal of and the interest on bonds of the Fifty-second Series shall be fully or partially, as the case may be, satisfied
and discharged to the extent that, at the time that any such payment shall be due, the then due principal of and interest on the Burlington Bonds Series 2004B-2 shall have been fully or partially paid, or there shall be in the Bond Fund established
pursuant to the Burlington Indenture sufficient available funds to fully or partially pay the then due principal of and interest on the Burlington Bonds Series 2004B-2. The Corporate Trustee may conclusively presume that the obligation of the
Company to make payments with respect to the principal of and interest on bonds of the Fifty-second Series shall have been fully satisfied and discharged unless and until the Corporate Trustee shall have received a written notice from the Burlington
Trustee, signed by its President, a Vice President, or a Trust Officer, stating (i) that timely payment of the principal of or interest on the Burlington Bonds



-20-



---

Series 2004B-2 required to be made by the Company has not been made, (ii) that there are not sufficient available
funds held in the Bond Fund to make such payment, and (iii) the amount of funds, in addition to available funds held in the Bond Fund, required to make such payment.

(IV) At the option of the registered owner, any bonds of Fifty-second Series, upon surrender thereof, for cancellation, at the office or agency of the Company in the Borough of Manhattan, The City of New York, shall
be exchangeable for a like aggregate principal amount of bonds of the same series of other authorized denominations. The bonds of the Fifty-second Series may bear such legends as may be necessary to comply with any law or with any rules or
regulations made pursuant thereto or with the rules or regulations of any stock exchange or to conform to usage with respect thereto.

(V)
Bonds of the Fifty-second Series shall be transferable upon the surrender thereof, for cancellation, together with a written instrument of transfer in form approved by the registrar duly executed by the registered owner or by his duly authorized
attorney, at the office or agency of the Company in the Borough of Manhattan, The City of New York.

(VI) The Company may deliver to the
Burlington Trustee in substitution for any bonds of the Fifty-second Series, mortgage bonds or other similar instruments of the Company or any successor entity, whether by merger, combination or acquisition of all or substantially all of the assets
of the Company, or otherwise, issued under the Mortgage in the event of a reallocation of the Burlington Bonds Series 2004B-2 in connection with a change in Mode as provided in Section 2.1 of the Burlington Indenture or under a mortgage and
deed of trust or similar instrument of the Company or any successor entity, in each case, in like principal amount of like term and bearing the same rate of interest as the bonds of the Fifty-second Series (such substituted bonds hereinafter being
referred to as the Substituted Mortgage Bonds). The Substituted Mortgage Bonds may only be delivered to the Burlington Trustee upon receipt by the Burlington Trustee of (i) if not delivered under the Mortgage, a letter from
Moodys (as hereinafter defined), dated within ten days prior to the date of delivery of the Substituted Mortgage Bonds, stating that its rating of the Substituted Mortgage Bonds is at least equal to its then current rating on the bonds of the
Fifty-second Series, (ii) if not delivered under the Mortgage, a letter from S&P (as hereinafter defined), dated within ten days prior to the date of delivery of the Substituted Mortgage Bonds, stating that its rating of the Substituted
Mortgage Bonds is at least equal to its then current rating on the bonds of the Fifty-second Series, (iii) an opinion of counsel which may be in-house counsel or counsel to the Company or any successor entity, to the effect that the Substituted
Mortgage Bonds shall have been duly and validly authorized, executed, authenticated, and delivered and shall constitute the valid, legally binding and enforceable obligations of the Company or any successor entity enforceable in accordance with
their terms, except as limited by bankruptcy, insolvency or other laws affecting the enforcement of mortgagees and other creditors rights and shall be entitled to the benefit of the Mortgage or the mortgage and deed of trust or other
similar instrument pursuant to which they shall have been issued, (iv) an opinion of Bond Counsel, as defined in the Burlington Indenture, to the effect that the substitution of the Substituted Mortgage Bonds will not adversely affect the
exclusion from gross income for federal income tax purposes of interest on the Burlington Bonds Series 2004B-2 and (v) such other certificates and documents with respect to the issuance and delivery of the Substituted Mortgage Bonds as may be
required by law or as the Burlington Trustee may reasonably request.



-21-



---

Moodys means Moodys Investor Services, Inc., a corporation organized and existing
under the laws of the State of Delaware, its successors and their assigns, except that if such corporation shall be dissolved or liquidated or shall no longer perform the functions of a securities rating agency, then the term
Moodys shall be deemed to refer to any other nationally recognized securities rating agency selected by the Company.

S&P means Standard & Poors Ratings Services, a division of The McGraw Hill Companies, Inc., duly organized and existing under and by virtue of the laws of the State of New York, and its successors and assigns,
except that if such rating agency shall be dissolved or liquidated or shall no longer perform the functions of a securities rating agency, then the term S&P shall be deemed to refer to any other nationally recognized securities
rating agency selected by the Company.

ARTICLE III

AMENDMENTS TO THE MORTGAGE AND RESERVATION OF RIGHTS

SECTION 1. The Company reserves the right, subject to
appropriate corporate action, but without any consent or other action by holders of Bonds of the Fifty-first Series and Fifty-second Series, or of any subsequent series of bonds, to make such amendments to the Mortgage, as supplemented, as shall be
necessary in order to (A) permit the issuance of additional Prior Lien Bonds other than to the Corporate Trustee (i) in a principal amount not to exceed the principal amount of Bonds which could then be issued on the basis of Property
Additions under the Mortgage or (ii) upon the redemption or retirement of Prior Lien Bonds secured by such Prior Lien, (B) to remove the requirement that Prior Lien Bonds be issued to the Corporate Trustee, (C) remove the provisions
of Article V which eliminate from the calculation of unfunded net Property Additions available for issuance of Bonds the amount of any Property Additions subject to a Prior Lien if the aggregate amount of Outstanding Prior Lien Bonds is 15% or more
of the sum of the Outstanding Bonds and Prior Lien Bonds, and (D) make such other amendments to the Mortgage as may be necessary or desirable in the opinion of the Company to effect the foregoing.

SECTION 2. The Company reserves the right, subject to appropriate action, but without any consent or other action by holders of Bonds of the Fifty-first
Series and Fifty-second Series, or of any subsequent series of bonds, to clarify the ability of the Company to issue variable rate bonds under the Mortgage, notwithstanding any provision of the Mortgage to the contrary. The Company may make such
other amendments to the Mortgage as may be necessary or desirable in the opinion of the Company to effect the foregoing.

SECTION 3. The
Company reserves the right, subject to appropriate action, but without any consent or other action by holders of Bonds of the Fifty-first Series and Fifty-second Series, or of any subsequent series of bonds, to amend the Mortgage to eliminate the
requirements for the provision by the Company of a Net Earning Certificate by deleting Section 27, Section 28(6) and Section 30(3) and deleting the following language from the end of Section 26: and, in case the bonds are
to be authenticated and delivered under the provisions of the next preceding paragraph of this Section by reason of an increase in the aggregate principal amount of bonds authenticated and delivered under this Indenture



-22-



---

having increased the aggregate principal amount of bonds which may be authenticated and delivered within the limitations
prescribed by this Section, a Net Earning Certificate showing the Net Earnings of the Company to be as required by Section 27 hereof. The Company may make such other amendments to the Mortgage as may be necessary or desirable in the
opinion of the Company to effect the foregoing.

SECTION 4. The Company reserves the right, subject to appropriate action, but without any
consent or other action by holders of Bonds of the Fifty-first Series and Fifty-second Series, or of any subsequent series of bonds, to amend the Mortgage as may be necessary in order to permit the Company to deliver to the Trustee in substitution
for any bonds issued under the Mortgage, mortgage bonds or other similar instruments of the Company or any successor entity, whether by merger, combination or acquisition of all or substantially all of the assets of the Company, or otherwise, issued
under a mortgage and deed of trust or similar instrument of the Company or any successor entity in like principal amount of like term and bearing the same rate of interest as the original bonds (such substituted bonds hereinafter being referred to
as the Substituted Mortgage Bonds). The Substituted Mortgage Bonds may only be delivered to the Trustee upon receipt by the Trustee of (i) if the original bonds were rated by Moodys, a letter from Moodys (as hereinafter
defined), dated within ten days prior to the date of delivery of the Substituted Mortgage Bonds, stating that its rating of the Substituted Mortgage Bonds is at least equal to its then current rating on the original bonds, (ii) if the original
bonds were rated by S&P, a letter from S&P (as hereinafter defined), dated within ten days prior to the date of delivery of the Substituted Mortgage Bonds, stating that its rating to the Substituted Mortgage Bonds is at least equal to its
then current rating on the original bonds, (iii) an opinion of counsel which may be counsel to the Company or any successor entity, to the effect that the Substituted Mortgage Bonds shall have been duly and validly authorized, executed,
authenticated, and delivered and shall constitute the valid, legally binding and enforceable obligations of the Company or any other successor entity enforceable in accordance with their terms, except as limited by bankruptcy, insolvency or other
laws affecting the enforcement of mortgagees and other creditors right and shall be entitled to the benefit of the mortgage and deed of trust or other similar instrument pursuant to which they shall have been issued and (iv) such
other certificates and documents with respect to the issuance and delivery of the Substituted Mortgage Bonds as may be required by law or as the Trustee may reasonably request. The Company may make such other amendments to the Mortgage as may be
necessary or desirable in the opinion of the Company to effect the foregoing.

Moodys means Moodys Investor Services, Inc., a
corporation organized and existing under the laws of the State of Delaware, its successors and their assigns, except that if such corporation shall be dissolved or liquidated or shall no longer perform the functions of a securities rating agency,
then the term Moodys shall be deemed to refer to any other nationally recognized securities rating agency selected by the Company.

S&P means Standard & Poors Rating Services, a division of The McGraw Hill Companies, Inc., duly organized and existing under and by virtue of the laws of the State of New York, and its successors and assigns,
except that if such rating agency shall be dissolved or liquidated or shall no longer perform the functions of a securities rating agency, then the term S&P shall be deemed to refer to any other nationally recognized securities
rating agency selected by the Company.



-23-



---

SECTION 5. The Company reserves the right, subject to appropriate action, but without any consent or
other action by holders of Bonds of the Fifty-first Series and Fifty-second Series, or of any subsequent series of bonds, to amend the Mortgage to add the following new section:

This Indenture shall be deemed to be a contract made under the laws of the State of Kansas and for all purposes shall be construed in accordance
with the laws of the State of Kansas, without regard to conflicts of laws principles thereof.

SECTION 6. The Company reserves the
right, subject to appropriate action, but without any consent or other action by holders of Bonds of the Fifty-first Series and Fifty-second Series, or of any subsequent series of bonds, to amend the Mortgage to:

(I) Eliminate maintenance and improvement fund requirements;

(II) Simplify the provisions for release of obsolete property, de minimis property releases and substitution of property and unfunded property;

(III) Permit additional terms of bonds or forms of bond in supplemental indentures, including terms for uncertificated and global securities and
medium-term notes;

(IV) Make any changes necessary to conform the Mortgage with the requirements of the Trust Indenture Act;

(V) Add defeasance provisions providing for covenant and legal defeasance options;

(VI) Permitting the Company to remove the trustee in certain circumstances;

(VII) Providing for direction to the trustee under the Mortgage to vote pledged prior lien bonds for specified amendments to the prior lien mortgage;

(VIII) Providing broader investment directions to the trustee or permitting the Company to direct investment of money held by the trustee,
so long as there is no event of default under the Mortgage;

(IX) Amending the definition of Excepted Property to exclude
property which generally cannot be mortgaged without undue administrative burden (i.e., automobiles), but allowing the Company to subject Excepted Property to the Mortgage;

(X) Amending the definition of Bondable Property to allow all mortgaged property to be bondable;

(XI) Updating the definition of Permitted Liens; and

(XII) Eliminate the requirement to have an individual trustee under the Mortgage.



-24-



---

ARTICLE IV

MISCELLANEOUS PROVISIONS

SECTION 1. All Bonds of the Fifty-first Series and Fifty-second Series acquired
by the Company shall forthwith be delivered to the Corporate Trustee for cancellation.

SECTION 2. Subject to the amendments provided for
in this Forty-sixth Supplemental Indenture, the terms defined in the Mortgage, as heretofore supplemented, shall, for all purposes of this Forty-sixth Supplemental Indenture, have the meanings specified in the Mortgage, as heretofore supplemented.

SECTION 3. The Trustees hereby accept the trusts herein declared, provided, created or supplemented and agree to perform the same upon the
terms and conditions set forth herein and in the Mortgage, as heretofore amended and supplemented, and upon the following terms and conditions:

The Trustees shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Forty-sixth Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made
by the Company solely. In general, each and every term and condition contained in Article XVI of the Mortgage, as heretofore amended and supplemented, shall apply to and form part of this Forty-sixth Supplemental Indenture with the same force and
effect as if the same were herein set forth in full with such omissions, variations and insertions, if any, as may be appropriate to make the same conform to the provisions of this Forty-sixth Supplemental Indenture.

SECTION 4. Subject to the provisions of Article XV and Article XVI of the Mortgage, as heretofore amended and supplemented, whenever in this Forty-sixth
Supplemental Indenture any of the parties hereto is named or referred to, this shall be deemed to include the successors or assigns of such party, and all the covenants and agreements in this Forty-sixth Supplemental Indenture contained by or on
behalf of the Company or by or on behalf of the Trustees shall bind and inure to the benefit of the respective successors and assigns of such parties whether so expressed or not.

SECTION 5. Nothing in this Forty-sixth Supplemental Indenture, expressed or implied, is intended, or shall be construed, to confer upon, or to give to,
any person, firm or corporation, other than the parties hereto and the holders of the bonds and coupons Outstanding under the Mortgage, any right, remedy or claim under or by reason of this Forty-sixth Supplemental Indenture or any covenant,
condition, stipulation, promise or agreement hereof, and all the covenants, conditions, stipulations, promises and agreements in this Forty-sixth Supplemental Indenture contained by or on behalf of the Company shall be for the sole and exclusive
benefit of the parties hereto, and of the holders of the bonds and of the coupons Outstanding under the Mortgage.

SECTION 6. This
Forty-sixth Supplemental Indenture shall be executed in several counterparts, each of which shall be an original and all of which shall constitute but one and the same instrument.



-25-



---

IN WITNESS WHEREOF, KANSAS GAS AND ELECTRIC COMPANY has caused its corporate name to be hereunto affixed,
and this instrument to be signed and sealed by Mark A. Ruelle, Vice President and Treasurer, and its corporate seal to be attested by Larry D. Irick, its Secretary for and on its behalf, BNY MIDWEST TRUST COMPANY has caused its corporate name to be
hereunto affixed, and this instrument to be signed and sealed by one of its duly authorized officers and its corporate seal to be attested by one of its Assistant Secretaries for and on its behalf, and Judith L. Bartolini has hereunto set her hand
and all as of the day and year first above written.



KANSAS GAS AND ELECTRIC COMPANYBy:

/s/ Mark A. RuelleMark A. RuelleVice President and Treasurer


Attest:



|                   |  |                                  
|------------------ |  | ---------------------------------
|/s/ Larry D. Irick |  | (corporate seal)                 
|Larry D. Irick     |  | [KANSAS GAS AND ELECTRIC COMPANY]
|Secretary          |  | [INCORPORATED 1990 KANSAS]       



|                                                                                    
|------------------------------------------------------------------------------------
|Executed, sealed and delivered byKANSAS GAS AND ELECTRIC COMPANY,in the presence of:
|                                                                                    
|/s/ Jean Macfee                                                                     
|Jean Macfee                                                                         
|                                                                                    
|/s/ Patti Beasley                                                                   
|Patti Beasley                                                                       



---

|                               |  |                               |  |                 
|------------------------------ |  | ----------------------------- |  | ----------------
|                               |  | BNY MIDWEST TRUST COMPANY, as
|                               |  | Trustee                      
|(corporate seal)               |  |                               |  |                 
|[BNY MIDWEST TRUST COMPANY]    |  | By:                           |  | /s/ D.G. Donovan
|[CORPORATE SEAL 1991 ILLINOIS] |  |                               |  | D.G. Donovan    
|Attest:                        |  |                               |  | Vice President  



|                        
|------------------------
|/s/ L. Garcia           
|L. Garcia               
|Assistant Vice President



/s/ Judith L. Bartolini(Judith L. Bartolini)




|                                                                       |  |                 
|---------------------------------------------------------------------- |  | ----------------
|Executed, sealed and delivered by                                     
|BNY MIDWEST TRUST COMPANY and JUDITH L.
BARTOLINI, in the presence of:
|                                                                       | 
|/s/ Roxane Ellwanger                                                   |  | Roxane Ellwanger
|                                                                       | 
|/s/ Lena D. Mopsik                                                     |  | Lena D. Mopsik  



---

|                   |  |   |  |     
|------------------ |  | - |  | ----
|STATE OF KANSAS    |  | ) |  |     
|                   |  | : |  | ss.:
|COUNTY OF SEDGWICK |  | ) |  |     

BE IT REMEMBERED, that on this 30th day of May, A.D. 2006, before me, the undersigned, a Notary
Public within and for the County and State aforesaid, came Mark A. Ruelle, the Vice President and Treasurer of KANSAS GAS AND ELECTRIC COMPANY, a corporation duly organized, incorporated and existing under the laws of the State of Kansas, who is
personally known to me to be such officer, and who is personally known to me to be the same person who executed, as such officer, the within instrument of writing, and such person duly acknowledged the execution of the same to be the act and deed of
said corporation and that said instrument of writing was so executed by order of the Board of Directors of said corporation.

On this 30th
day of May, 2006, before me appeared Larry D. Irick, to me personally known, who being by me duly sworn did say that he is the Secretary of KANSAS GAS AND ELECTRIC COMPANY, and that the seal affixed to the foregoing instrument is the corporate seal
of said corporation, and that said instrument was signed and sealed in behalf of said corporation by authority of its Board of Directors, and said Larry D. Irick acknowledged said instrument to be the free act and deed of said corporation.

On the 30th day of May in the year 2006, before me personally appeared Mark A. Ruelle to me known, who, being by me duly sworn, did depose
and say that he is the Vice President and Treasurer of KANSAS GAS AND ELECTRIC COMPANY; that the seal affixed to the foregoing instrument is the corporate seal of said corporation, and that said instrument was signed and sealed in behalf of said
corporation by authority of its Board of Directors, and said Mark A. Ruelle acknowledged said instrument to be the free act and of said corporation.

IN WITNESS WHEREOF, I have hereunto subscribed my name and affixed my official seal on the day and year above written.



|                                  |  |                                
|--------------------------------- |  | -------------------------------
|                                  |  | /s/ Merilee K. Martin          
|(notary seal)                     |  |                                
|[Merilee K. Martin]               |  |                                
|[NOTARY PUBLIC - STATE OF KANSAS] |  |                                
|[MY APPT EXP: 7-8-2007]           |  | NOTARY PUBLIC - STATE OF KANSAS
|                                  |  | MY APPOINTMENT EXPIRES 7-8-2007



---

|                  |  |   |  |     
|----------------- |  | - |  | ----
|STATE OF ILLINOIS |  | ) |  |     
|                  |  | : |  | ss.:
|COUNTY OF COOK    |  | ) |  |     

BE IT REMEMBERED, that on this 25th day of May, A.D. 2006, before me, the undersigned, a Notary
Public within and for the County and State aforesaid, came D.G. Donovan, a Vice President of BNY Midwest Trust Company as trustee, a corporation, duly organized, incorporated and existing under the laws of the State of Illinois, who is personally
known to me to be such officer, and who is personally known to me to be the same person who executed, as such officer, the within instrument of writing, and such person duly acknowledged the execution of the same to be the act and deed of said
corporation and that said instrument of writing was so executed by authority of the Board of Directors of said corporation.

On this 25th
day of May, 2006, before me appeared L. Garcia, to me personally known, who being by me duly sworn did say that she is an Assistant Vice President of BNY MIDWEST TRUST COMPANY, and that the seal affixed to the foregoing instrument is the corporate
seal of said corporation, and that said instrument was signed and sealed in behalf of said corporation by authority of its Board of Directors, and said L. Garcia acknowledged said instrument to be the free act and deed of said corporation.

On the 25th day of May in the year 2006, before me personally came D.G. Donovan, to me known, who, being by me duly sworn, did depose and
say that he resides at Arlington Heights, Illinois, that he is a Vice President of BNY MIDWEST TRUST COMPANY, one of the corporations described in and which executed the above instrument; that he knows the seal of said corporation; that the seal
affixed to said instrument is such corporate seal; that it was so affixed by authority of the Board of Directors of said corporation, and that he signed his name thereto by like authority.

IN WITNESS WHEREOF, I have hereunto subscribed my name and affixed my official seal on the day and year above written.



/s/ T. MosterdNOTARY PUBLIC, STATE OF ILLINOISCOMMISSION EXPIRES 1/22/09


(notary seal)

[OFFICIAL SEAL]

[T. MOSTERD]

[NOTARY PUBLIC - STATE
OF ILLINOIS]

[MY COMMISSION EXPIRES JANUARY 22, 2009]



---

|                  |  |   |  |     
|----------------- |  | - |  | ----
|STATE OF ILLINOIS |  | ) |  |     
|                  |  | : |  | ss.:
|COUNTY OF COOK    |  | ) |  |     

On this 25th day of May in the year 2006, before me, the undersigned, a Notary Public in and for
the State of Illinois, in the County of Cook, personally appeared and came Judith L. Bartolini, to me known and known to me to be the person described in and who executed the within and foregoing instrument and whose name is subscribed thereto and
acknowledged to me that he executed the same.

IN WITNESS WHEREOF, I have hereunto subscribed my name and affixed my official seal the day
and year in this certificate first above written.



/s/ A. HernandezNOTARY PUBLIC, STATE OF ILLINOISCOMMISSION EXPIRES 7/8/06


(notary seal)

[OFFICIAL SEAL]

[A. Hernandez]

[Notary
Public, State of Illinois]

[My Commission Expires 7/8/06]



---

AFFIDAVIT



|                   |  |   |  |    
|------------------ |  | - |  | ---
|STATE OF KANSAS    |  | ) |  |    
|                   |  | ) |  | SS:
|COUNTY OF SEDGWICK |  | ) |  |    

I, Larry D. Irick, being first duly sworn on oath, depose and say:

1. I am the Secretary of Kansas Gas and Electric Company, a corporation duly organized and existing under the laws of the State of Kansas (the
Company). I am duly authorized to make this affidavit on behalf of the Company.

2. The Company has heretofore executed and
delivered to BNY Midwest Trust Company (as successor to Harris Trust and Savings Bank) (the Corporate Trustee) and Judith L. Bartolini (the Individual Trustee, together with the Corporate Trustee, the Trustees), a
Mortgage and Deed of Trust, dated as of April 1, 1940, (hereinafter called the Indenture), to secure the Companys First Mortgage Bonds.

3. The Company has heretofore executed and delivered to the Trustees supplemental indentures numbered First through Forty-fifth, inclusive, (hereinafter called the Supplemental
Indentures), creating other series of the Companys First Mortgage Bonds.



-31-



---

4. The Indenture and all Supplemental Indentures confirmed unto the Trustees the real property situated
in the State of Kansas which is subject to the lien of the Indenture.

5. The Indenture and all Supplemental Indentures were duly received
and filed for record in accordance with the laws of the State of Kansas, and the mortgage registration fee thereon provided for was, and has been, paid in full by the Company.

6. Under the Fortieth Supplemental Indenture, the Company duly paid the mortgage registration fee in the amount of $1,780,538.50, based upon $684,822,500
of the Companys indebtedness. The Fortieth Supplemental Indenture is found in the Sedgwick County Register of Deeds office at film 2062, page 53.

7. The Company has executed and delivered to the Trustees a Fifty-first Series and Fifty-second Series of bonds to be issued under and secured by the Indenture, the Supplemental Indentures and a new Supplemental
Indenture dated as of June 1, 2006, (hereinafter called the Forty-sixth Supplemental Indenture).

8. The purpose of the
Forty-sixth Supplemental Indenture is to reflect the issuance and pledge of $100,000,000 principal amount of First Mortgage Bonds.

9.
$100,000,000 of the principal amount of the First Mortgage Bonds issued pursuant to the Forty-sixth Supplemental Indenture tendered for filing constitutes the same principal indebtedness covered or included in the Fortieth Supplemental Indenture
with BNY Midwest Trust Company and Judith L. Bartolini, Trustees, the same lender.



-32-



---

10. Under the Forty-sixth Supplemental Indenture the registration fee with respect to all of the
indebtedness of $1000,000,000 has been previously paid by the Company in connection with the Fortieth Supplemental Indenture and by virtue thereof is considered by the Company to be the same indebtedness, and thus exempt from the payment of further
registration fees pursuant to the provisions of K.S.A. 79-3102(d)(3).

[REMAINDER OF PAGE LEFT BLANK INTENTIONALLY]



-33-



---

FURTHER AFFIANT SAITH NAUGHT.



/s/ Larry D. IrickLarry D. Irick, SecretaryKansas Gas and Electric Company


Subscribed and sworn to before me this 30th day of May, 2006.



/s/ Merilee K. MartinNotary Public


(notary seal)

[Merilee K. Martin]

[NOTARY PUBLIC - STATE OF KANSAS]

[MY APPT EXP: 7-8-2007]

My Commission Expire 7-8-2007



-34-