Seventy-fifth Supplemental Indenture

Exhibit 4(b)

PPL ELECTRIC UTILITIES CORPORATION

(formerly PP&L, Inc. and Pennsylvania Power & Light Company)

TO

DEUTSCHE BANK TRUST COMPANY AMERICAS

(formerly Bankers Trust Company,

successor to Morgan Guaranty Trust Company of New York,

formerly Guaranty Trust Company of New York)

As Trustee under PPL Electric Utilities Corporation’s

Mortgage and Deed of Trust,

Dated as of October 1, 1945

_____________________________

Seventy-fifth Supplemental Indenture

Providing among other things for

First Mortgage Bonds, 4.95% Collateral Series due December 15, 2015, and

First Mortgage Bonds, 5.15% Collateral Series due December 15, 2020

_____________________________

Dated as of December 1, 2005

Seventy-fifth Supplemental Indenture

SEVENTY-FIFTH SUPPLEMENTAL INDENTURE, dated as of December 1, 2005 made and entered into by and between PPL ELECTRIC UTILITIES CORPORATION (formerly PP&L, Inc. and Pennsylvania Power & Light Company), a corporation of the Commonwealth of Pennsylvania, whose address is Two North Ninth Street, Allentown, Pennsylvania 18101 (hereinafter sometimes called the Company), and DEUTSCHE BANK TRUST COMPANY AMERICAS (formerly Bankers Trust Company), a corporation of the State of New York, whose address is 60 Wall Street, New York, New York 10005 (hereinafter sometimes called the Trustee), as Trustee under the Mortgage and Deed of Trust, dated as of October 1, 1945 (hereinafter called the Mortgage and, together with any indentures supplemental thereto, hereinafter called the Indenture), which Mortgage was executed and delivered by Pennsylvania Power & Light Company to secure the payment of bonds issued or to be issued under and in accordance with the provisions of the Mortgage, reference to which said Mortgage is hereby made, this instrument (hereinafter called the Seventy-fifth Supplemental Indenture) being supplemental thereto.

WHEREAS, said Mortgage was or is to be recorded in various Counties in the Commonwealth of Pennsylvania, which Counties include or will include all Counties in which this Seventy-fifth Supplemental Indenture is to be recorded; and

WHEREAS, by amendment to its Articles of Incorporation filed in the Office of the Secretary of State of Pennsylvania on September 12, 1997, the Company changed its name to PP&L, Inc.; and

WHEREAS, by an amendment to its Articles of Incorporation filed with the Office of the Secretary of State of Pennsylvania on February 14, 2001, the Company changed its name to PPL Electric Utilities Corporation; and

WHEREAS, an instrument, dated August 5, 1994, was executed by the Company appointing Bankers Trust Company as Trustee in succession to said Morgan Guaranty Trust Company of New York (resigned) under the Indenture, and by Bankers Trust Company accepting said appointment, which instrument was or is to be recorded in various Counties in the Commonwealth of Pennsylvania; and

WHEREAS, by an amendment to its Articles of Incorporation filed in the office of the Secretary of State of New York, effective April 15, 2002, the Trustee changed its name to Deutsche Bank Trust Company Americas; and

WHEREAS, by the Mortgage the Company 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 Indenture and to make subject to the lien of the Indenture any property thereafter acquired and intended to be subject to the lien thereof; and

WHEREAS, the Company executed and delivered as supplements to the Mortgage, the following supplemental indentures:

which supplemental indentures were or are to be recorded in various Counties in the Commonwealth of Pennsylvania; and

WHEREAS, the Company executed and delivered its Supplemental Indenture, dated July 1, 1954, creating a security interest in certain personal property of the Company, pursuant to the provisions of the Pennsylvania Uniform Commercial Code, as a supplement to the Mortgage, which Supplemental Indenture was filed in the Office of the Secretary of the Commonwealth of Pennsylvania on July 1, 1954, and all subsequent supplemental indentures were so filed; and

WHEREAS, in addition to the property described in the Mortgage, as heretofore supplemented, the Company has acquired certain other property, rights and interests in property; and

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

which bonds are also sometimes called bonds of the First through Eighty-first Series, respectively; and

WHEREAS, Section 8 of the Mortgage provides that the form of each series of bonds (other than the First Series) issued thereunder 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 Indenture 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 Indenture; and

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 Indenture, 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 future 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 Indenture shall be situated; and

WHEREAS, the Company now desires to create two new series of bonds and to add to its covenants and agreements contained in the Mortgage, as heretofore supplemented, certain other covenants and agreements to be observed by it and to alter and amend in certain respects the covenants and provisions contained in the Mortgage; and

WHEREAS, the execution and delivery by the Company of this Seventy-fifth Supplemental Indenture, and the terms of the bonds of the Eighty-second and Eighty-third 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 PPL Electric Utilities Corporation, in consideration of the premises and of One Dollar to it duly paid by the Trustee 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 Trustee 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 Indenture, according to their tenor and effect and the performance of all the provisions of the Indenture (including 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 Deutsche Bank Trust Company Americas, as Trustee under the Indenture, and to its successor or successors in said trust, and to said Trustee and its successors and assigns forever, all property, real, personal and mixed, of the kind or nature specifically mentioned in the Mortgage, as heretofore supplemented, or of any other kind or nature, acquired by the Company after the date of the execution and delivery of the Seventy-fifth Supplemental Indenture (except any herein or in the Mortgage, as heretofore supplemented, expressly excepted and except any which may not lawfully be mortgaged or pledged under the Indenture), now owned or, subject to the provisions of Section 87 of the Mortgage, hereafter acquired by the Company (by purchase, consolidation, merger, donation, construction, erection or in any other way) and wheresoever situated, including (without in anywise limiting or impairing by the enumeration of the same the scope and intent of the foregoing) all lands, power sites, flowage rights, water rights, water locations, water appropriations, ditches, flumes, reservoirs, reservoir sites, canals, raceways, dams, dam sites, aqueducts, and all other rights or means for appropriating, conveying, storing and supplying water; all rights of way and roads; all plants for the generation of electricity by steam, water and/or other power; all 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, water systems, steam heat and hot water plants, substations, lines, service and supply systems, bridges, culverts, tracks, ice or refrigeration plants and equipment, offices, buildings and other structures and the equipment thereof; all machinery, engines, boilers, dynamos, electric, gas and other 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 and chattels; all municipal and other franchises, consents or permits; all lines for the transmission and distribution of electric current, gas, steam heat or water for any purpose including towers, 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, hereditaments, prescriptions, servitudes, and appurtenances belonging or in anywise appertaining to the aforesaid proper