I. Introduction -- II. Summary and conclusions -- III. Methods -- IV. Data analysis presentation The opacity of visible emissions from the two stationary sources within the Edwards Generating Station, Central Illinois Light Company (CILCO), Batonville, Illinois, were measured during the period from June 3 through June 4, 1980. The sources investigated were Stacks 1 and 2. Stack 1 was observed during late afternoon and early morning hours. Stack 2 was observed during early morning hours. All measurements were conducted remotely from off the plant site. Opacities were measured remotely with the NEIC Omega-1 Lidar which is a new instrumentation method. The method has been proposed in the Federal Register as Alternate Method 1 to Refernce Method 9. All opacity measurements were subsequently analyzed and reduced with the NEIC laboratory computer using the methods given in Alternate Method 1 (proposed). Five sets of opacity measurements were made, the total of which was about 1.75 hrs of observation and about 600 individual measurements. The set of measurements ranged in length from 14 to 30 minutes. Measurements were made at a temporal frequency range from once about every 9 to 10 seconds.