Conectiv, Inc. is a holding company formed in 1998 by the merger of Atlantic Electric Incorporated and Delmarva Power and Light Company, two large regional power utilities that supplied Southern New Jersey and the Delmarva Peninsula. The majority of the images in this collection come from the Delmarva Power and Light Company (DP&L), a predecessor of Conectiv, Inc. The images can generally be divided into three categories: DP&L equipment and facilities, DP&L employees, and views of buildings, both commercial and residential, throughout northern Delaware.

Roberta S. Brown (dates private) is the president of Sassafras River Associates, LLC, an energy consulting and investment firm. She previously spent twenty-four years with Pepco Holdings, Inc. subsidiaries Delmarva Power, Pepco, and Conectiv, Inc., ultimately serving as vice president of transmission. Delmarva Power and Light Company is a regulated energy company that provides electricity and natural gas services to customers in the Delmarva Peninsula. Conectiv, Inc. is a holding company formed in 1998 by the merger of Atlantic Electric Incorporated and Delmarva Power and Light Company, two large regional power utilities that supplied southern New Jersey and the Delmarva Peninsula. In 2002, Potomac Electric Power Company (Pepco) acquired Conectiv, Inc. and created Pepco Holdings, Inc., a holding company that owned both Conectiv and Delmarva Power. This is a small collection of Brown's papers from her time as vice president at the Delmarva Power and Light Company and Conectiv, Inc. Most of the files are from Delmarva Power and Light Company, primarily original images from their employee newsletter. There are also many booklets about power-generating stations from various utility companies. The collection is arranged in three series: Delmarva Power and Light Company files; Conectiv files; and Electric industry trade publications.

The Westinghouse Machine Company manufactured gas and steam engines, turbines and mechanical stokers. The vast corporate photographic archive from this division covers diverse topics including technical subjects showing surface condensers and reduction gears and components used to construct different types of turbines. There are building construction views and thorough documentation of the Essington property; specifically, this includes the blade, diaphragm, erecting, and forge shops, several different types of laboratories on the premise, a foundry and pickle house. In addition, there are images of the pattern storage house, power house, pump house, and salvage building

The Westinghouse Machine Company began in 1880, and the company's first contract to build a turbine dates to 1896. The album contains a variety of images of products and facilities related to the Westinghouse Electric and Manufacturing Company. These include photographs of equipment such as boilers, generators, mechanical stokers, pumping machinery and turbines.

The Westinghouse Machine Company manufactured gas and steam engines, turbines and mechanical stokers. This is one sixteen-page copy of the Westinghouse Electric & Manufacturing Company magazine from the South Philadelphia plant.