Exelon announced Tuesday that it will cancel extended power uprates that had been deferred at four of its reactors.

The company notified the Securities and Exchange Commission that the projects at the LaSalle and Limerick plants would be cancelled outright because of market conditions. Consequently, Exelon will take a second quarter pre-tax charge of $100 million for early contract termination costs and other uprate-related expenses, according to an SEC filing.

Early last year, executives said they were closely watching those projects, as well as an uprate planned for the Peach Bottom plant in Pennsylvania. The SEC filing did not mention the 12.4 percent extended power uprate planned for both Peach Bottom units, and the NRC still lists them as under review on its website.