Electricity was first installed in the White House in 1891. It was such a new concept that President Benjamin Harrison and his wife both refused to touch light switches due to their fear of electrocution- so the White House staff had to follow them around and turn the lights off and on for them. Source

Years later… President Lyndon B. Johnson was quite the opposite. He would often wander the House turning off the lights in empty rooms where they had been left on. This earned him the nickname ‘Light Bulb Johnson.’