Meanwhile, the adjacent 1,140 MW unit 2 remained shut for a planned refueling outage that began last week.

PPL said that unit 2 is on a 24-month refueling cycle and would return to service before the peak summer demand season.

PPL is also in the middle of a program to boost the plant’s output in phases. The first phase, completed on unit 1 in 2008, increased the plant’s output by about 50 MW. In 2009, 2010 and 2011, PPL will improve additional equipment, which should add another 110 MW.