A significant amount of power grid equipment has practically zero residual value, yet has remained in use thanks to periodic technical examination and repair. At the same time, companies do not have sufficient resources to completely upgrade fixed assets. Companies are faced with the challenge of finding an optimal balance between maintaining dilapidated equipment for comparatively low repair and operational costs, and replacing it with expensive modern equipment which will save money on subsequent maintenance. What are the best practices among chief engineers in distinguishing equipment that can be repaired from equipment that should be replaced? To what extent can modern digital equipment help improve economic performance indicators? In which areas is the latest digital technology already proving advantageous?