Who was the US president when electricity was installed in the White House?

Benjamin Harrison. The lights were installed in 1891 along with the State, War, and Navy Building. The Harrison family was actually afraid to touch the light switches for fear of getting shocked! They would leave the turning of lights on and off to the chief Usher. Thomas Edison was the first in America to electrify his home in 1878, so the White House was only 13 years behind him. It would not be until the 1920s and 1930s before electricity became common in a private home.

https://www.whitehousehistory.org/questions/in-what-year-was-electricity-installed-in-the-white-house.

https://www.nps.gov/edis/learn/kidsyouth/the-electric-light-system-phonograph-motion-pictures.htm