The confrontation over wasting electricity happened Monday in East Lampeter Township.
Police say 32-year-old Nicole Marie Wagner accused her 31-year-old apartment-mate of leaving the lights on, and that Wagner threatened to kill her.
(You know, the cost of electricity and all...)
Township police Lt. Robin Weaver says Wagner grabbed a spear and stabbed the victim in the back and the hand. She was treated at the hospital.
Wagner was being held on $50,000 bail in Lancaster County Prison. She faces charges of aggravated assault and terroristic threats.