ENVIRONMENT

TVA to Buy Pollution Credits: The Tennessee Valley Authority said it will buy sulfur dioxide emission credits from a Wisconsin utility to help it meet clean-air standards. TVA, one of the nation’s biggest emitters of sulfur dioxide, plans to buy pollution allowances for its coal-fired plants from Wisconsin Power & Light Co., one of the nation’s cleanest utilities. The pollution credits will cost TVA $2.5 million to $3 million a year. The giant federal utility, which operates 59 coal-fired units at 11 plants in Tennessee, Alabama and Kentucky, estimates that it will spend $750 million to $850 million on equipment by 1995 to comply with provisions of the Clean Air Act.