The company name, Keifuku Electric Railroad Co., Ltd., originated from the 'Keifuku Power Line' which was provided by the Kyoto Dento, an electric power company (the former Keifuku Electric Railroad Co., Ltd.), to mutually transmit power between the prefectures of Kyoto and Fukui, since Kyoto (e.g., Gion) had a large power demand during the night but Fukui had a large power demand during the day for the operation of textile facilities.
京都は祇園を始め夜間の電力需要が多く、福井は逆に織物工場が稼動する昼間の電力需要が多いため、互いの電力を融通するために前身の京都電燈が建設した「京福送電線」が語源となっている。