EXHIBIT B-4 HARRISON POWER STATION CONSTRUCTION AND OPERATING AGREEMENT, dated as of March 3, 1971, among MONONGAHELA POWER COMPANY, an Ohio corporation ("Monongahela"), THE' POTOMAC EDISON COMPANY, a Maryland corporation ("Potomac"), and WEST PENN...Harrison Power Station Construction and Operating • September 22nd, 1999 • Allegheny Energy Inc • Electric services
