The original author does no longer maintain the plugin and it currently contains bugs. Installation is not recommended until a new maintainer has been found and the bugs have been fixed.
Plugin to enable automatic system shutdown after finishing a print job
This OctoPrint plugin enables the system to be automatically shut down after a print is finished. The user can enable automatic shutdown for each print by using a checkbox in the sidebar. Once the print is finished, a popup will appear with a countdown which lets the user abort the shutdown.