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Lights have been turned back on for about 28,600 Ameren Illinois Utilities (AIU) customers in Southern Illinois, while more than 1,400 field and support personnel continue to repair the extensive damage caused by Friday's inland hurricane. Throughout the day, field crews have encountered major unexpected damage to the AIU electrical distribution system in and around Carbondale. As a result, the AIU Emergency Operations Center is sending additional field personnel and specialized equipment to help overcome the enormous damage caused by the exceptionally violent spring storm. At 5:20 p.m. today, about 40,200 AIU customers are still without electric service, down from the peak outage count of 68,800 customers. The Ameren Illinois Utilities now anticipate the majority of all customers will have their lights back on by late Tuesday night. However, the unexpected severity of the damage in Carbondale means that service in and around that city may not be fully restored until Thursday.

Exelon has begun a series of nuclear power plant uprates that will add between 1,300 MW and 1,500 MW of generating capacity at its existing fleet of nuclear units over the next eight years, the company said Friday. The first of the uprates, totaling about 38 MW, was confirmed last week following upgrades at Exelon's Quad Cities plant near Cordova, Illinois. Uprate projects, some of which require US Nuclear Regulatory Commission approval, improve efficiency and increase electricity output of nuclear units through upgrades to plant equipment, Chicago-based Exelon said. The projects take advantage of new production and measurement technologies, new materials and experience from decades of nuclear power operations, the company said. Uprate efforts are underway at Exelon's Limerick and Peach Bottom nuclear plants in Pennsylvania, and the Dresden, LaSalle and Quad Cities plants in Illinois. Those are expected to produce nearly 25% of the added capacity. The remainder of capacity would come from uprates at nine other plants beginning in 2010 and ending in 2017.