Download SKM POWER*TOOLS 11 SKM PTW v11.0.0.4 SKM PTW v11.0.0.4 is a release of SKM Power Tools for Windows (PTW), a widely used electrical engineering software suite for power system analysis, arc flash hazard studies, and design simulations. Version 11.0 introduces significant updates, but projects created in v11.0 are not backward compatible with earlier versions.