Goodwill Industries of the Chesapeake announced Tuesday it will open the Excel Center in Baltimore, a free high school for adults so they can earn a Maryland Department of Education-issued diploma. The school, which opens September, will use a proven curriculum and approach developed over the past decade at more than 30 Excel campuses in seven states. The center will be located at Goodwill’s former headquarters at 222 E Redwood in downtown Baltimore. Initially, Goodwill is recruiting 150 students and will expand to 350 students.