The collection consists primarily of photographs that depict sites of various PP&L subsidiaries and those directly operated by the company. It is a resource that can be used for insight into PP&L's early operations and eastern and central Pennsylvania industrial development. Images within this collection range from 1920 to 1973. Researchers interested in electric power transmission and its development within the state of Pennsylvania would find this collection useful.

The collection is arranged into three series: PP&L subsidiaries, Company activities, and Employees and facilities.

The PP&L subsidiaries series is comprised of images of railroad facilities and structures such as bridges, stations, and office buildings operated by PP&L subsidiary companies. The series is arranged into thirteen subseries in alphabetical order by company name. Companies shown include: Allied Chemical and Dye, Bartlett Division; Bundy Tubing Company; Corbis Manufacturing Company; Durkee Famous Foods; Foster-Wheeler Corporation; R.T. French Company; Hamilton Watch Company; Harrisburg Steel Company, Biordi plant; Hoffman Industries; Jones & Laughlin Steel Corporation; Keystone Pipeline Company; Lehigh Navigation Coal Company; Mack Manufacturing Company; Magee Carpet Company; Merck and Company; Metropolitan Wire Goods; Piper Cub Aircraft; Pillsbury Mills; Schick Company; Steelex Corporation; Thompson Products. (NOTE: many of these only show plant exteriors.) All subseries include the original envelopes the photographs were removed from for preservation purposes. Envelopes were retained for image identification. The images date from 1920 to 1953, and a majority of the images are dated 1926.

The Company activities series is organized into four subseries: Annual reports, Events and meetings, Principal items of property, and Projects and stations. All subseries are arranged in alphabetical order.

The Annual reports subseries consists of photographic prints taken from Pennsylvania Power & Light annual reports from 1949 to 1958. These include views of power stations and images illustrating electric use (industrial and residential) in central Pennsylvania. The images also show company activities such as facility operations, construction projects, and shareholder events. Some years include the published annual report. There are also photograph use permission release forms.

Events and meetings subseries include the directors' tour of 1954, shareowners' meetings, and 40th-anniversary celebrations, which took place in 1960. There are also images and sound recordings from the 1964 New York World's Fair.

The Principal items of property subseries contains eight albums, "Principal Items of Property," of the Pennsylvania Power & Light Company presented as evidence before the Pennsylvania Public Utility Commission in 1943. These photographic prints include views of power plants (Stanton, Bennett, Hauto, Harwood, Pine Grove, Kulpmont, Good Spring, Lykens, Millersburg, Cedar, Walnut, South Milton, Williamsport, Lock Haven), transmission lines, substations (Siegfried, Wallenpaupack, Freemansburg, Allentown, Cherry Hill, Wilkes-Barre, Frackville, Exchange, Fishbach, Shenandoah, Greenwood, Harrisburg, Carlisle, Engleside, Donegal, Berwick, Danville, Northumberland) and general buildings (including service depots).

The Projects and stations subseries include brush cutting, quarry stripping, the construction of general buildings and transmission lines, and the implementation of electricity for daily operations within a dairy farm. Images of stations within this series include those of Holtwood hydro station and Safe Harbor Water Power Corporation hydroelectric development. Materials date from 1926 to 1966.

The Employees and facilities series is organized into three subseries: Facilities, assorted; PP&L employees; and PP&L facilities. All subseries are arranged in alphabetical order.

Facilities, assorted subseries are images of a parking garage, a textile factory, a farm, and other non-PP&L facilities. Most of the images are undated. One image of a man in a hospital bed dates around 1950.

PP&L employees subseries include machinists, linemen, chemists, kitchen staff, and the secretary. There is a portrait of company president Charles Oakes. Images date from 1950 to 1956.

PP&L facilities subseries images include a system operator's office circa 1972 and the Allentown general office in 1958. One unidentified image dates from around 1923.