A power cut can damage files and make them unusable. In the save folder you will see a Backup folder - you will need to move the file from in there "up one level" to replace your existing copy. This will restore you to the previous save point. If that does not work you would unfortunately need to abandon that save as there would not be any further data to work with.
Designer of TEW, WMMA, WreSpi, and Comic Book Hero