A big power company with customers in Tennessee and Virginia, accused of spreading smog and acid rain across the Mid-Atlantic and Northeast, has agreed to pay at least 4.6 billion dollars to cut chemical emissions. The agreement with American Electric Power Company ends an eight-year legal battle over reducing smokestack pollution that chewed away at mountain ranges, bays and national landmarks. AEP maintains it never violated Clean Air Act rules to curb emissions, and had already spent or planned to pay over 5 billion dollars on scrubbers and other equipment to reduce its pollution. AEP must pay a 15 million-dollar civil fine and 60 million dollars in cleanup and mitigation costs to help heal polluted land in the Shenandoah National Park and waterways. AEP has more than 5 million customers in 11 states, including Virginia.