The yearlong, nail-biting drama over the fate of Exelon’s Byron and Dresden nuclear plants came to an end on Monday afternoon when the Illinois Senate gave its nod to S.B. 2408, a wide-ranging clean energy package that seeks to phase out fossil-fuel power generation in the state and place it on a path to 100 percent carbon-free energy by 2050.

Exelon's Byron generating station in northern Illinois. The future of Byron is uncertain at this time and could impact the new power generation company, once it's formed.

Exelon Corporation announced yesterday that it intends to spin off Exelon Generation, its competitive power generation and customer-facing energy businesses, from Exelon Utilities, its group of six regulated electric and gas utilities.

The split into two publicly traded companies will “establish the nation’s largest fully regulated transmission and distribution utility company and the largest carbon-free power producer paired with the leading customer-facing platform for clean, sustainable energy solutions,” Exelon said in its February 24 announcement.