It depends on which type of power line. If it is a primary power line, which are the power lines that run from pole to pole and do not go to the house or other building, it is best to contact the utility company directly. For power lines going to a home or other building, the horizontal clearance is 18" and the vertical distance is 3 feet above a roof with a slope of 4/12 or greater and 8 feet from a roof with a slope of less than 4/12.
Consumers Energy https://www.consumersenergy.com/
Homeworks Tri-County Co-op https://homeworks.org/
Lansing Board of Water and Light http://www.lbwl.com/